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2018 Vol. 38, No. S1

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2018, 38(S1): .
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2018, 38(S1): .
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Optimization Design of Mount Container Based on Quality Improvement
HAN Fei, DAI Xu, FAN Xiao-du, HU Jin, GENG Yong
2018, 38(S1): 1-4. doi:10.15918/j.tbit1001-0645.2018.增刊1.001
Abstract(712) PDF(296)
Abstract:
In this paper, the cracking quality issues of the mount container were described for a certain military off-road vehicle. Through simulating cracking conditions and checking the structure of the cracked part, the main cause of cracking was determined. Due to the multi-factor characteristics of the container cracking, the ADDOFD method, strain energy analysis, sensitivity analysis and orthogonal test were used to analyze and calculate to determine the optimal solution under various conditional constraints. Through CAE virtual verification and real vehicle test verification, the quality issues of the container cracking were solved. The results can provide a reference for the design and improvement design of the off-road vehicle container.
Study on the Bulletproof Skill with Graphene Composite Armor Material for Police Vehicle
LING Jian-shou, WU Yue, LIU Di
2018, 38(S1): 5-9. doi:10.15918/j.tbit1001-0645.2018.增刊1.002
Abstract(936) PDF(492)
Abstract:
A research on the application technology with high performance bullet proof material was carried out for police cars. Firstly, a graphene modified method was used to improve the strength and elasticity of ceramic and aluminum alloy. Then, a composite bulletproof armor was prepared with graphene modified material. Finally, a target practice test was implemented to validate the feasibility of the graphene modified method. The results show that, graphene modified method can improve the toughness of ceramic material and the strength and elasticity module of aluminum alloy. The composite armor made by graphene modified material can against 3 times of 7.62 mm API piercing incendiary.
Research on Performance of CFRP/Al Four-Riveted Joint
CHEN Xiao-kai, JIN Jia-wei, LI Meng-qiang, GUO Zi-yu, FU Dong
2018, 38(S1): 10-14. doi:10.15918/j.tbit1001-0645.2018.增刊1.003
Abstract(892) PDF(365)
Abstract:
The carbon fiber reinforced composite (CFRP), as a new type of lightweight material, has got a lot of attention in its connection with metal. To analyze the performance of joint, a sample structure of CFRP/Al four-riveted joint was designed firstly. Then, a comparison of experiment and simulation was carried out to find out failure forms and displacement-load curves of single-lap joint and T-joint, and to validate the effectiveness of a 3D progressive damage finite element model. And the effects of different joint sizes on mechanical properties of four-rivet joint were compared with simulation. The results show that the shear strength is largest when the rivet diameter is 5 mm, and the peel strength is greater the larger diameter of the rivet. When the rivet row pitch is 25 mm, the shear strength is the largest, and the peel strength increases with the row pitch. When the array pitch is 15 mm, the shear strength reaches a maximum, and the peel strength increases with the array pitch. Therefore, the rivet joint can effectively solve the connection problem between the CFRP and the aluminum alloy, and selecting the proper joint size can improve the mechanical properties of the joint.
Lightweight Design of the Tank Body of Oil Trucks Under Operations of Multiple Loading Conditions
LI Xue-rui, DUAN Shu-yong, LIU Gui-rong
2018, 38(S1): 15-19. doi:10.15918/j.tbit1001-0645.2018.增刊1.004
Abstract(820) PDF(275)
Abstract:
The tank body of an oil truck may account for 12%~24% of the whole vehicle weight. Lightweight design of tank bodies is essential for reducing engine fuel consumption and improving steering stability of trucks. The structure design of tank body made of metal is matured, and it is difficult for further lightweight, because of the high density of metals. Making use of the excellent mechanical properties, low density and the designability of composite materials, a novel lightweight composite tank body was designed and analyzed in this work, considering operations of the truck under multiple road conditions. Firstly, a three-dimensional model of the tank body was established based on the finite element method. The numerical simulations were then conducted to study the stress distribution of the tank body in detail under static and dynamic loading conditions. Modal analyses were then performed to determine the natural frequencies and corresponding vibration modes of a number of fundamental modes, which provides a useful reference for engine selections of the truck. The results show that mass of the composite tank mass is 64.1% less than steel counterpart, and 19.8% less than the aluminum counterpart.
Principle Design and Test of a MR Fluid Mount with an Inner Bypass Valve
QIAN Li-jun, DU Hao, CHEN Peng, BAI Xian-xu
2018, 38(S1): 20-23. doi:10.15918/j.tbit1001-0645.2018.增刊1.005
Abstract(1158) PDF(369)
Abstract:
Ideal power-train mounting systems should have large stiffness and damping at low frequencies and large amplitudes, small stiffness and damping at high frequencies and small amplitudes. To solve the problems of small controllable range of dynamic stiffness, large field-off dynamic stiffness and limit stroke of the existing magneto rheological (MR) fluid mounts, a MR fluid mount with an inner bypass valve was proposed and developed. The MR fluid mount was designed to provide a wide range of dynamic stiffness in full working frequency range, small field-off dynamic stiffness and maximum stroke. Electromagnetic field simulation analysis of the MR fluid mount was carried out with a finite element simulation software. A mathematical model of the MR fluid mount was built. Experimental tests based on the servo-hydraulic test system were conducted.
Lateral Vibration Characters of High Speed and High Power PMSM Rotor Induced by Electromagnetic Excitation
CHEN Xing, LI Jun, ZHAO Shu-en, DENG Tao, WEI Han-bing
2018, 38(S1): 24-28. doi:10.15918/j.tbit1001-0645.2018.增刊1.006
Abstract(829) PDF(360)
Abstract:
The rotor shafting of high speed and high power permanent magnet synchronous motor (PMSM) is a nonlinear system involving electromagnetic and mechanical coupling, so the dynamic performance of the rotor is a problem that must be paid attention to in the PMSM design for high speed vehicles. A nonlinear model of the rotor system was established based on nonlinear rotor dynamics. The amplitude frequency characteristics of the lateral vibration of the rotor were calculated with the analytical method. The results show that the lateral vibration of the rotor reveals negative stiffness and instability amplitude jumping phenomenon. Finally, the results of equivalent analytical calculation were verified by numerical calculation.
Studying on Rolling Bearing Lubrication Characteristics under Abundant Lubrication
LI Xiao-xiao, YAN Ke, ZHU Yong-sheng, HONG Jun
2018, 38(S1): 29-32. doi:10.15918/j.tbit1001-0645.2018.增刊1.007
Abstract(708) PDF(340)
Abstract:
Rolling bearing is a key supporting component for major equipment such as precision machine tools and special vehicles. Lubrication performance directly determines the stable serving performance of the bearing, which in turn affects the performance indicators of major equipment. In this paper, the operating characteristics were studied based on the theoretical simulation and experimental analysis for the oil-air lubrication rolling bearings under the wide-range lubrication parameters. Firstly, according to the multi-phase flow analysis technology, the flow state of oil and gas in the high-speed angular contact ball bearing was studied, and a basic law of oil and gas flow inside the bearing was revealed. Then, an experiment platform was designed to validate the rolling bearing lubrication performance. The influence of different lubrication parameters on the bearing temperature was experimentally analyzed, the optimal bearing lubrication parameters with the smallest temperature rise at a specific rotation speed were obtained, and the influence of the different lubrication parameters on its service performance was confirmed. The research results provide a basis for the service performance analysis of rolling bearings under wide-range lubrication conditions
Intelligent Sensing Technology for Mechanical Transmission System
HUANG Wen-bin, DING Xiao-xi, DU Ming-gang, SHAO Yi-min
2018, 38(S1): 33-37. doi:10.15918/j.tbit1001-0645.2018.增刊1.008
Abstract(834) PDF(292)
Abstract:
In this paper, the development of intelligent sensing technology for key parts of transmission system was reviewed, including vibration and lubrication condition monitoring, and ultrasonic communication technology across the closed metal box. The results show that, vibration monitoring is mainly realized by embedded micro-acceleration sensor and wireless communication technology; Lubrication contact states include pressure, temperature distribution and oil film thickness. The measurement of contact pressure and temperature distribution can be achieved by the metal film resistor sensor, and the oil film thickness monitoring can be achieved by contact capacitance method or non-contact ultrasonic method. Since the closed metal box can shield the electromagnetic signal, it is urgent to realize the bidirectional communication across the box based on mechanical wave. Meanwhile, the research and development of gear vibration and strain wireless monitoring system was briefly introduced. The experimental results show that the recorded internal signal can clearly reflect the speed and contact information, so as to reflect the real-time running state of the transmission system.
Study on Vibration Control and Noise Reduction of Special Vehicle Based on Modularized Design
LIU Jing, HOU Yu, SU Ting-hui, ZHANG Qing, SHAO Yi-min
2018, 38(S1): 38-43. doi:10.15918/j.tbit1001-0645.2018.增刊1.009
Abstract(732) PDF(257)
Abstract:
Modern special vehicles run usually in complex condition with bumpy road and bad environment. Due to the effect of ride comfort problem on body and mind state of the drivers, the study on vibration reduction and noise reduction of the special vehicle have been paid attention. To solve the problems existing in the study, including the variety of special vehicle, a long research time, high cost for single special car and low efficiency, a modular design method was proposed to design module material, thickness, size,assembly scheme and the matching relationship between car body, engine and support for the special vehicle. Taking special vehicle as study objective, a series of schemes was formed based on the modular design method for the vibration reduction and noise reduction to realize the modularization and generalization of different vehicle with lower design and processing costs. Simulation and road test results show the effect of vibration and noise reduction and the effectiveness of the modular design method. The method proposed in this paper can provide a useful reference for the vibration reduction and noise reduction measures of special vehicles.
Research on Erection System Based on Accumulator Type Auxiliary Power Source
ZHANG Jun-hui, LIU Dai-feng, XU Bing, Zhang Chun-feng
2018, 38(S1): 44-48. doi:10.15918/j.tbit1001-0645.2018.增刊1.010
Abstract(676) PDF(327)
Abstract:
To solve the problem of long erection time and high installed power of vehicle borne missile launcher, a quick erection scheme based on accumulator auxiliary power source was proposed. Firstly, a simulation model was established based on AMESim and Simulink software for the vertical system of multistage cylinder, and the energy distribution strategy and control switching strategy of the system were formulated. Then, the vertical speed and power characteristics of the system were simulated and studied, and the comparison of the system with the valve control system and the pump valve compound speed control system was carried out. The results show that the system can provide rapid and stable erection of the equipment, and can significantly reduce the system power, possessing reference significance for the upgrading of the erection equipment.
Study on Ergonomics Layout Method of Off-Road Vehicle Mounted Weapon Station
ZHANG Lu-yang, ZHU Ji-jin, LI Meng, TU Jin-jin, ZHOU Mian
2018, 38(S1): 49-54. doi:10.15918/j.tbit1001-0645.2018.增刊1.011
Abstract(778) PDF(292)
Abstract:
With the changes of the military combat environment and tactical requirements, the countries all over the world have been demanding more and more high-level combat protection capabilities against combatant vehicles themselves. Therefore, the development of vehicle-mounted overhead remote-controlled weapon systems has become more and more important for the military of all countries. In this paper, the optimal placement of on-board weapon station elements and the human operating environment arranged in the vehicle were studied based on ergonomics. According to the human-machine function knowledge, the human spine was simplified into a computable classical theoretical mechanics model to parameterize the comfort of the human spine and obtain the optimal range of comfortable backrest angle of the human body. And considering the geometric constraint of the human body, the coordinate matrix algebraic operation was taken to get the comfortable operation and display range for shooters.
The Study on General Technology of In-Wheel Motor Drive Multiaxis Off-Road Vehicle
LIU Yong
2018, 38(S1): 55-58. doi:10.15918/j.tbit1001-0645.2018.增刊1.012
Abstract(721) PDF(261)
Abstract:
Analyzing the history of miliary development and equipment construction, and considering the domestic and overseas development status of multiaxis off-road vehicle, the multiaxis off-road vehicle characterized by in-wheel motor drive was initially identified as the major trend for the development of wheeled equipment in the future. With further description of the advantages that the use of in-wheel motor brings to the vehicle, structuring intelligentized integrated vehicle control strategies, improving vehicle handling stability and ride comfort, exploring new experimental verification technology and exerting the characteristics of power flexibility transmission, etc. being the current overall technologies with breakthrough pending, were preliminarily analyzed and generalized, based on which, relevant technical solutions and research directions were also put forward to come up with new conceptions and new proposals for the development of equipment related technologies.
Analysis on Internal Flow Characteristics of Special Vehicle Turbocharger
GUO Zhi-qiang, MEN Ri-xiu, YAN Ke, SUN Yu-jie
2018, 38(S1): 59-62. doi:10.15918/j.tbit1001-0645.2018.增刊1.013
Abstract(770) PDF(323)
Abstract:
Turbocharger is an important power component of special power equipment. Better sealing is the key factor to ensure the normal operation of the turbocharger. Uneven pressure caused by high speed operation of the impeller is usually an important cause of leakage. Based on the fluid mechanics analysis method, a finite element model was established. The internal flow field analysis and flow characteristics of a centrifugal pump seal structure were studied. The variations of compressor leakage and internal pressure at different speeds and narrow outlet negative pressure were discussed. The sealing performance of the seal structure was verified. The results show that the sealing structure has a good effect of preventing oil leakage at the compressor end due to high-speed centrifugal effect, and leakage occurs at high speed. The research results provide reference for improving the sealing structure of vortex booster.
Optimization Design of Waterjet Axial-Pump Based on Surrogate Method
XIAO Lei, ZHANG Meng-jie, WU Qin, LIU Ying, WANG Guo-yu
2018, 38(S1): 63-66. doi:10.15918/j.tbit1001-0645.2018.增刊1.014
Abstract(881) PDF(375)
Abstract:
A parameter optimization method was proposed for waterjet axial pump blade design based on the global sensitivity analysis and prediction method of surrogate model. Taking the fixed blade angles in impeller and guide vane as the optimization parameters, and taking waterjet pump efficiency and raise range as the optimization objective, the energy and cavitation performances of the axial pump were simulated and analyzed. The simulation results show that, the fixed blade angle in the impeller has a greater influence on the pump performances than that in the guide vane. The optimization method can well improve the axial pump performances, in both efficiency and cavitation performance, being suitable for the waterjet axial-pump design.
ABS Controland Hardware in Loop Investigation for a Heavy Duty Vehicle Based on Road Recognition
HUANG Wei-hong, LU Yong-jie, LI Shao-hua, ZHANG Jun-ning
2018, 38(S1): 67-71. doi:10.15918/j.tbit1001-0645.2018.增刊1.015
Abstract(717) PDF(309)
Abstract:
An algorithm for estimating the adhesion coefficient of road surface was proposed by building vehicle multi-body dynamic model. The road identification module, the braking module and brake pressure module of anti-lock braking system (ABS)were built in MATLAB/Simulink. And the braking performance of the vehicle was simulated and verified based on the adaptive control strategy. The hardware in the loop test was carried out on a triaxial automobile chassis test platform. The results show that, the vehicle braking distance with road recognition of ABS control system is shorter than that without road recognition of ABS control system. This system shows better adaptability and control precision.
Analysis on Travel Performance of Off-Road Tires on Pebble Road
ZENG Hai-yang, ZANG Meng-yan, ZHENG Zu-mei
2018, 38(S1): 72-75. doi:10.15918/j.tbit1001-0645.2018.增刊1.016
Abstract(797) PDF(335)
Abstract:
The travel performances of off-road tires on pebble road were investigated with the three-dimensional discrete element model and finite element model (DEM-FEM). Numerical simulations were performed based on the established FEM of off-road tires, the DEM of pebble road and a special software ORV-SAND for off-road tire-granular sand interaction simulation. Travel performances of the off-road tires with different tread patterns, such as normal reaction, rim sinkage, gross traction, drawbar pull and running resistance were obtained under different slip ratios (10%, 20% and 30%), and compared with the related experiment results.
Research on Coupling Effect Between Active Stabilizer-Bar and Active Front-Wheel Steering
YAN Ming-shuai, PI Da-wei, LI Yu-long, WANG Xian-hui
2018, 38(S1): 76-79. doi:10.15918/j.tbit1001-0645.2018.增刊1.017
Abstract(768) PDF(214)
Abstract:
To achieve an optimal control performance for the vehicles equipped with Active Stabilizer-bar and Active Front-wheel Steering, a coupling problem was researched with simulation. Firstly, a nonlinear vehicle dynamic model was established, and an active steering PID controller was designed. Then, based on the stabilizer-bar actuators, an active roll sliding mode controller and an anti-roll moment distribution fuzzy controller between front and rear axle were designed. Finally, the step steering and double-lane-change maneuver were simulated and analyzed. The simulation results show that the active steering can improve the roll performance, and the dynamic distribution and active steering can further improve the yaw stability, and guarantee the roll stability performance.
Constant Torque Control of Air-Fluid Control System for Hydraulic Retarder
WU Chao-xian, GUO Xue-xun, YANG Bo, PEI Xiao-fei
2018, 38(S1): 80-83. doi:10.15918/j.tbit1001-0645.2018.增刊1.018
Abstract(796) PDF(258)
Abstract:
A constant torque control of the air-fluid control system was studied for the hydraulic retarder. According to the relationship between control pressure and oil volume rate got from the hydraulic retarder experimental data, a model of the air-fluid control system, namely the oil volume control system model, was established for the hydraulic retarder based on AMEsim software. Then, a PID-based constant torque controller was also designed. Finally, combining the software AMEsim with Matlab/Simulink, a co-simulation was carried out to verify the constant torque control for the air-fluid control system of the hydraulic retarder. The simulation results show that, the retarder torque can remain constant when the target control torque of retarders is set less than the maximum retarder torque, and the torque controller can improve the control accuracy and real-time performance.
Modelling and Simulation of Diesel Engine Dynamic Characteristics Based on Speed Control
BAI Jin-yang, WU Xue-lei, ZHANG Jun-wei, LI Hong-biao
2018, 38(S1): 84-88. doi:10.15918/j.tbit1001-0645.2018.增刊1.019
Abstract(843) PDF(393)
Abstract:
A diesel model based on speed control was established to simulate the dynamic characteristics of engine. The diesel engine dynamic torque was obtained through dynamic modifying the diesel engine torque MAP, which was calculated based on the data get from steady-state bench test. According to the diesel operating state, the control strategies of full-load, partial-load and speed-limit conditions were designed based on the fuel consumption control. A diesel engine simulation model established in Matlab/Simulink environment was integrated with correlative transmission assemblies to constitute a vehicle dynamic model. And then, diesel engine simulations were carried out in two working conditions. The simulation and experiment results show that, the established model is accurate and effective for the simulation of engine in steady state and transient conditions, and the modeling approach proposed can solve the problem of high-precision modeling in limited test data. This research can provide a reference for quickly predicting the dynamic performance of the diesel engine.
Double Layer Architecture algorithm for Vehicle Mass Estimation
JIA Tian-le, WANG Hong-liang, PENG Pai, XUE Dong, WANG Xian-hui
2018, 38(S1): 89-92. doi:10.15918/j.tbit1001-0645.2018.增刊1.020
Abstract(766) PDF(258)
Abstract:
To solve the problem of commercial vehicle mass estimation in mountain area, a mass estimation algorithm was proposed for vehicle. Firstly, a double layer structure algorithm was designed based on a vehicle longitudinal dynamics model for commercial vehicle mass estimation. The upper layer of the algorithm was arranged for road grade estimation based on Tilt sensor, while the lower level of the algorithm was for the vehicle mass estimation based on the recursive least squares algorithm with time varying forgetting factor. Then, the influence of vehicle suspension on the upper layer algorithm was analyzed with TruckSim software, and the vehicle experiment was carried out. The experimental results show that the proposed algorithm can estimate road slope and vehicle mass effectively. The algorithm can improve the estimation accurate and the convergence speed. The mean square error of modified vehicle mass can be reduced from 209.97 kg to 117.43 kg.
Traction PID Control Based on Ant Colony Optimization for Electric Wheeled Vehicle
JIN Li-qiang, LING Ming-ze, LI Jian-hua, LEI Yu-long
2018, 38(S1): 93-97. doi:10.15918/j.tbit1001-0645.2018.增刊1.021
Abstract(746) PDF(237)
Abstract:
A traction control strategy based on PID and ant colony algorithm (ACO) was proposed to improve the longitudinal acceleration stability of electric wheeled vehicles. First, a method of engineering application was described to estimate the state parameters of vehicles in real time. Then the optimal slip rate was calculated with a designed fuzzy controller. Finally, the ACO was applied to the traction PID controller, to achieve the adjustment of the wheel torque and carry out the real vehicle test in the electric wheel car. The results show that the control strategy can meet the requirements and restrain the excessive slip of the wheels.
Linear Quadratic RegulatorAlgorithm for Tracked Vehicle Semi-Active Suspension
HUANG Ying, ZHAO Jian-zhu, PENG Zhao-hui, MA Chen-xu, WANG Zhi-ce, HUANG Shao-jiong
2018, 38(S1): 98-102. doi:10.15918/j.tbit1001-0645.2018.增刊1.022
Abstract(775) PDF(222)
Abstract:
In order to get better performance of semi-active suspension and ride comfort of tracked vehicle, Linear Quadratic Regulator (LQR) algorithm for semi-active suspension was studied. Firstly, based on the half vehicle dynamics model with seven degrees of freedom, a Linear Quadratic Regulator algorithm was designed for tracked chassis. And then, taking random road roughness as the excitant, simulation experiments of passive suspension and semi-active suspension under the control of SGHH and LQR were carried out to get the time responses and the frequency responses in different control strategies. The comparison experiment results show that, Linear Quadratic Regulator algorithm can not only reduce the acceleration, speed and deformation of weight bearing wheels to different degrees but improve ride comfort, satisfy the need of stability of shock absorber and weight bearing wheels adhesion performance of tracked chassis.
Ride Comfort Simulation and Integrated Evaluation for a Off-Road Vehicle
JIANG Yan-hua, MA Zhong-min, XU Da, LI Zhong-hao, LUO Zhen-Xing
2018, 38(S1): 103-106. doi:10.15918/j.tbit1001-0645.2018.增刊1.023
Abstract(800) PDF(266)
Abstract:
The ride comfort of a 4×4 off-road vehicle was analyzed according to the ride evaluation quality and method both under random road and impulse inputs. Firstly, the existing evaluation methods were reviewed. According to the quality requirement of the actual off-road vehicles, the analysis procedure, simulation method and integrated evaluation criterions were developed. Then, a multi-rigid-body dynamic vehicle model was established with software Adams. Finally, the ride comfort simulation and integrated evaluation were carried out, getting the evaluation indicators including the "Cross-country average velocity" under random road with different level, and the "Limited velocity" allowing to pass the obstacle with different heights. The simulation results show that the ride comfort quality of this vehicle can achieve the design requirements.
Research on Obstacle-Surmounting Performance of Wheel-Track Vehicle Chassis
XIE Xia, ZHANG Xue-ling, DUAN Xiu-bing, XU Liu
2018, 38(S1): 107-111. doi:10.15918/j.tbit1001-0645.2018.增刊1.024
Abstract(826) PDF(286)
Abstract:
The typical obstacle-surmounting performances of wheel-track vehicle chassis were studied in this paper. At first, the sizes of variant wheel were designed according to a certain vehicle and the three dimensional models were established. Then the critical states of crossing trench, climbing step and slope were determined based on kinematics and mechanical analysis, and the largest width across trench, the height over the step and the maximum slope angle were obtained respectively. The results show that the wheel-track vehicle chassis has stronger environmental adaptability and higher obstacle-surmounting performance than the normal wheel vehicle and track vehicle. These achievements provide a sufficient theoretical basis for optimum of structure and the extend application of the wheel-track vehicle in the future.
Straight Driving StabilityControl of Series Tracked Vehicle with Coupling Mechanism
LIU Hui, ZHANG Cong, HAN Li-jin, CAO Fu-hui, WANG Wei-da, HOU Xu-chao
2018, 38(S1): 112-116. doi:10.15918/j.tbit1001-0645.2018.增刊1.025
Abstract(818) PDF(287)
Abstract:
In this paper, the output torque and speed characteristics of coupling mechanism and the influence on the driving stability of the hybrid tracked vehicle were analyzed firstly. Then a vehicle dynamics model was established based on the MATLAB/Simulink platform, considering the effect of slip ratio of a vehicle on the adhesion coefficient. To improve the straight driving stability, a control strategy was designed to calculate the compensation of motor torque by detecting speed changes on both sides of the vehicle. To solve the problem of parameter adaptability of PI controller, the self-learning function of neural network was applied to optimize PI controller parameters in real time. Finally, simulation analysis was carried out based on Simulink model. The simulation results show that, the horizontal displacement of the tracked vehicle can be controlled in 0.5%, which meets the requirements of national standards.
Dynamics Modeling and Performance Analysis for Electro Hydraulic Braking System
JIN Zhi-lin, ZHOU qian, ZHAO Wan-zhong
2018, 38(S1): 117-122. doi:10.15918/j.tbit1001-0645.2018.增刊1.026
Abstract(843) PDF(305)
Abstract:
To improving the estimate accuracy of pressure of electro-hydraulic braking (EHB) system, a novel dynamics modeling method was proposed based on particle swarm optimization and unscented Kalman filter (UKF) arithmetic. In the arithmetic, according to the work characteristic of EHB system, the pressure estimation was translated into optimizing multidimensional parameter. The nonlinear differential equations were derived in terms of dynamic characteristics of electro-hydraulic braking system. Then, the UKF was applied to estimate the time-varying parameters of the model with an objective function. To obtain accurately the time-varying parameters, the measurement noise, process noise, and parameters in the unscented Kalman filter were optimized with the particle swarm algorithm. Comparing with the experimental data in several braking cases, the results validate the effectiveness and accuracy of the novel method. Therefore, the proposed model can not only provide a theoretical basis for the design of a hydraulic braking system but also help realize the chassis integrated control of electric vehicles.
Study on Lightweight Design of Transmission Box Based on Load Spectrum
ZHAO Li-hui, YAO Yao, ZHENG Song-lin
2018, 38(S1): 123-127. doi:10.15918/j.tbit1001-0645.2018.增刊1.027
Abstract(708) PDF(298)
Abstract:
In view of the excessive strength and excessive mass of a special vehicle gearbox, it is necessary to further optimize the box. In the optimization process, the traditional method based on the empirical formula of speed and torque has provided a larger dynamic load factor with conservative calculation, reducing the subsequent optimization space. In this paper, a lightweight design method was proposed based on load spectrum of bench test to get dynamic load coefficient and stress constraint of the vehicle gearbox. Firstly, a stress characteristic distribution model of the box body was established to screen the location of the measuring points. Secondly, the box test was carried out and the load spectrum of dangerous parts was measured. Then the load spectrum was processed to obtain the dynamic load coefficient and the supporting force was corrected for the box body. Finally, topology optimization and size optimization were carried out to achieve the goal of lightweight.
Research on Car Body Lightweight of Electrical Vehicle Based on Sensitivity Analysis
GE Xu-kun, HE Li, YANG Jian-sen
2018, 38(S1): 128-132. doi:10.15918/j.tbit1001-0645.2018.增刊1.028
Abstract(719) PDF(473)
Abstract:
Electrical Vehicle is being in a period of rapid development, however, there are certain restrictions on the improvement of the mileage because of battery pack quality. A sensitivity analysis model of a body in white (BIW) for the electrical vehicle (EV) was established based on stiffness and modal analysis. Taking the minimum weight of BIW as the optimal objective, the design variable sensitivities were obtained with correlation calculation. Based on the sensitivity analysis and engineering experience, a reasonable plan was worked out for body weight reduction. The results show that, the weight of BIW can be reduced 6.2 kg without influence the performance significantly, presenting a reference for EV lightweight.
Research on Control Strategy for Hybrid Electric Vehicle's Economy-Oriented Adaptive Cruise
AN Quan, WANG Xiang-yu, LI Liang
2018, 38(S1): 133-136. doi:10.15918/j.tbit1001-0645.2018.增刊1.029
Abstract(1017) PDF(348)
Abstract:
Energy management strategy was studied for intelligent hybrid electric vehicle during adaptive cruise. A particle swarm optimization (PSO) algorithm based nonlinear model predictive control (MPC) was proposed. Combining the advantage of MPC in solving multi-object and multi-restriction optimization problem with the characteristic of PSO in small operand and high efficiency, the PSO was taken as the roll optimization method to form a PSO based MPC algorithm. Simulation results show that, the algorithm can make most car operation focus in low fuel consumption and can speed up the calculation process.
Drag Torque Prediction Model for High Speed Multi-Disc Wet Clutch
WEI Chao, HU Qi, LIU Yong
2018, 38(S1): 137-141. doi:10.15918/j.tbit1001-0645.2018.增刊1.030
Abstract(827) PDF(251)
Abstract:
The fluid-solid coupling motion of friction pairs in the high speed multi-disk wet clutch of the vehicle usually causes axial rub-impact between the friction plate and the steel plate, which leads to the drag torque of the friction pairs and decreases the efficiency of the vehicle transmission system. First, the coupling between friction pairs and rotating flow field was considered, and a fluid solid coupling dynamic model of friction pairs was established. Then, analyzing the rub-impacting process of friction plate and steel plate, an axial rub-impacting model was constructed to get the drag torque. Finally, the nonlinear motion response and the drag torque of the friction pairs at different rotational speeds were studied by numerical simulation, and the results were compared with the experimental results. The results show that with the increase of the speed of the clutch, axial rub-impact occurs at a critical speed, and the friction pairs change from stable state to chaotic motion state, and then the drag torque increases with the increases of the clutch speed.
Performance Analysis and Rollover Feed-Forward Warning for Multi-Axle Vehicle with All Wheel Steering
Zhang Zhida, Li Shaohua, Liu Xing, Zhou Junwei
2018, 38(S1): 142-146. doi:10.15918/j.tbit1001-0645.2018.增刊1.031
Abstract(821) PDF(249)
Abstract:
In order to study the stability and safety of multi-axle vehicles, a linear 2 degree of freedom vehicle model with full wheel steering was established, and the steering ratio coefficients of vehicle were calculated according to Ackerman principle. Lateral load transfer rate of vehicle was estimated based on the quasi static lateral inclination theory, the yaw angular velocity gain was solved with Laplasse transform, and a rollover forward feedforward early warning algorithm was proposed. Through the comparison of theoretical values and simulation values, it is found that the proposed algorithm can predict the vehicle's tilting state effectively, and the algorithm can also calculate limit speed and limit angle of vehicle steering. The research has important reference significance for vehicle tilting state estimate and rollover control early warning.
Clutch Reliability Compensation Control Based on Friction Coefficient and Its Rate of Change
LIU Jin-gang, XIAO Pei-jie, CHEN Jian-wen, ZHAO You-hong, LIN Hui-ming
2018, 38(S1): 147-151. doi:10.15918/j.tbit1001-0645.2018.增刊1.032
Abstract(881) PDF(346)
Abstract:
A reliability compensation control scheme was proposed based on the change rate of friction coefficient to solve the problem of possible clutch control failure caused by an excessive change rate of friction coefficient. By using SAE#2 test platform, the friction coefficient test was completed, and the variation of friction coefficient with working parameters was obtained under different input speed, oil temperature and oil pressure. A failure evaluation model was established based on the change rate of friction coefficient and the compensation fuzzy control scheme was designed. The bench test results show that the improved control algorithm can effectively extend the clutch engagement time and improve the working reliability of the clutch friction pair under the high temperature overload condition with high friction coefficient.
Simulation Analysis of Gear Vibration Noise and Optimization Design of Pure Electric Vehicle Gearbox
CAI Wenqi, PENG Xianchang, BAO Yinghao, GAO Bingzhao
2018, 38(S1): 152-156. doi:10.15918/j.tbit1001-0645.2018.增刊1.033
Abstract(972) PDF(322)
Abstract:
To solve the problem of vibration and noise of a new pure electric vehicle gearbox, considering the influence of gear transmission error,a two speed gearbox simulation model was proposed for the dynamic analysis of the transmission system. A block Lanczos method was used to solve the modal frequencies and modes of the gearbox. By using the coupled acoustic boundary element method, the dynamic analysis results were taken as the excitation to solve the radiation sound field of the gearbox, and the gear of the gearbox was optimized. The simulation and experiment results show that, the method can improve the vibration and noise of the gearbox obviously.
Noise Analysis and Optimization of Two-Speed Automatic Transmission for Electric Vehicles
CHEN Yong, ZHENG Yang-yang, LI Guang-xin, ZANG Li-bin, YU Miao, WU Zhong-yun
2018, 38(S1): 157-160. doi:10.15918/j.tbit1001-0645.2018.增刊1.034
Abstract(822) PDF(395)
Abstract:
Taking tooth surface load distribution and gear transmission error as the optimization objectives, the effect of gear micro modification on the vibration and noise of two-speed automatic transmission system was analyzed and compared for electric vehicles. A Rigid-flexible coupling dynamic model was established for the rotor and transmission of the motor. Taking the vibration acceleration at the bearing of the transmission as the excitation, a near-field sound radiation cloud and radiated sound power of the transmission under rated operating conditions were calculated. The results show that the radiated noise of the gearbox after gear modification can be well suppressed, providing reference significance for the optimization of the transmission and reduction of the vibration and noise of the transmission.
Research on Integrated Control Strategy for Shifting Process of Automatic Transmission
LEI Yu-long, HU Jian-long, ZHENG Xue-song, LI Xing-zhong, FU Yao
2018, 38(S1): 161-165. doi:10.15918/j.tbit1001-0645.2018.增刊1.035
Abstract(761) PDF(278)
Abstract:
In this paper, analyzing the dynamics principle of power shift process of automotive transmission (AT), a simulation platform was established for power transmission system with software MATLAB and LMS.Amesim. A phased control strategy was proposed for the power shift process, including torque phase and inertial phase. In the torque phase, the constant slope of friction torque was taken as the control objective, and the inertial phase was arranged for optimal tracking control. Considering the performance index function of the shift jerk and the clutch sliding work, the optimal control law was established based on the minimum principle, the shift time was optimized and the calculation process of the shift time was presented. The effectiveness of the control strategy was verified by simulation and real vehicle tests. The results show the control strategy can improve the comprehensive performance of vehicle shifting.
Optimal Design and Experimental Research on a New Hybrid Electromagnetic Actuator for Vehicle
WANG Ruo-chen, DAI Yu, DING Ren-kai, MENG Xiang-peng, CHEN Long
2018, 38(S1): 166-172. doi:10.15918/j.tbit1001-0645.2018.增刊1.036
Abstract(717) PDF(370)
Abstract:
A new hybrid electromagnetic actuator (HEMA) was proposed and designed to solve the problem of reliability of linear electromagnetic actuator. A modified skyhook control was adopted to match the structure of the HEMA and the performance parameters were optimized. Then, taking the peak electromagnetic thrust of the linear motor need as the optimization objective, the structural parameters of HEMA were optimized. Finally, a prototype was developed and carried out bench tests. Results show that the hybrid electromagnetic actuator can improve the vehicle dynamics performance, verifying the effectiveness of the prototype.
Design and Experimental Research of Electromagnetic Hybrid Suspension System Based on Active-Semi-Active Hybrid Control
MENG Xiang-peng, DING Ren-kai, WANG Ruo-chen, QIAN Yu-chen, CHEN Long
2018, 38(S1): 173-178. doi:10.15918/j.tbit1001-0645.2018.增刊1.037
Abstract(716) PDF(242)
Abstract:
In this paper, an electromagnetic hybrid suspension with active-semi-active hybrid control was proposed. It was arranged with three work modes, focusing respectively on improving the vibration resistance of the suspension, the grounding performance of the tire and the comprehensive performance. Combining with the advantages of active and semi-active control, an active-semi-active hybrid control system was established. A LQG control strategy was designed and the weighting coefficients of each mode were determined by genetic algorithm. Simulation analysis was carried out. The simulation results show that the electromagnetic hybrid suspension with hybrid control can significantly reduce the energy consumption compared with the electromagnetic active suspension, and its control effect is not very different from the electromagnetic active suspension. Finally, the experimental research was carried out. The experiment results are very match with the simulation results, verifying the validity of the system structure and the correctness of the control method.
Study on the Lightweight of CFRP Composite Materials for the Body in White Cab of Commercial Vehicles
XIE Xiao-ping, CHEN Wei
2018, 38(S1): 179-182. doi:10.15918/j.tbit1001-0645.2018.增刊1.038
Abstract(662) PDF(262)
Abstract:
A constitutive model of Carbon Fiber Reinforced polymers (CFRP)composites was established based on the experiment and simulation analysis. Analyzing the static stiffness and dynamic mechanics of the body in white (BIW) cab of a commercial vehicle, and selecting the CFRP composite material as the material of the cab model, a steel/CFRP hybrid material structure was designed and solved by finite element software Nastran. The simulation results show that the rigidity of the cab model after weight reduction can remain basically the same with that of original cab, but its first-order torsional frequency is increased by 27.3%, and the overall quality of the BIW cab is reduced by 37.9 kg, a reduction of 11.3%. The obvious lightweight effect can prove the CFRP composite materials broad prospects in the automotive lightweight field.
Cracking Analysis and Research for Water Tank Lower Beam of A Vehicle
GUAN Jia-tuan, CHEN Yun-cheng, XU Qian-qian, YU Hai-bo
2018, 38(S1): 183-186. doi:10.15918/j.tbit1001-0645.2018.增刊1.039
Abstract(707) PDF(484)
Abstract:
In order to resolve cracking problem appeared in the reliability test for the lower beam of the water tank, the body suspension point load was studied based on multi-body dynamics analysis and finite element analysis to analyze and verify the cracks taken place in the water tank lower beam. The results show that the abnormal cracking of the lower beam of the water tank is due to the stress concentration at the step of the lower beam. The maximum stress in the cracked position of the step is about 294.2 MPa with the material HC340LAD+Z and yield limit 340 MPa. However, when high-cycle running (more cycle times), fatigue damage can still occur. Considering the cause of cracking, a structural optimization program was proposed. Through road test verification, the optimized structure can meet the design requirements.
Cracking Analysis and Research for Floor Longitudinal Beam of A non-Loaded vehicle Body
GUAN Jia-tuan, CHEN Yun-cheng, XU Qian-qian, LIU Yu-bo
2018, 38(S1): 187-191. doi:10.15918/j.tbit1001-0645.2018.增刊1.040
Abstract(708) PDF(375)
Abstract:
For the cracking problem taking place in the surrounding area of the floor suspension longitudinal beam of a non-loaded off-road vehicle prototype during the reliability test at the Dingyuan test field in Anhui province, some analysis and verification studies were carried out with CAE and road tests. Considering the determined cracking causes of the surrounding area on the floor longitudinal beam, an improvement plan was proposed for optimal structure design. Through the CAE analysis and comparison before and after the structure improvement, the structure optimization plan was verified in practical prototype reliability test.
Design of a Direct Wheel Drive System Utilizing Silent Chain Integrated with Semi-Trailing Suspension
LI Yan, XUE Nan-nan, LUO Feng-mei, CHEN Xin-bo
2018, 38(S1): 192-194. doi:10.15918/j.tbit1001-0645.2018.增刊1.041
Abstract(679) PDF(243)
Abstract:
The complicated structure and large unsprung mass of traditional distributed motor drive scheme have a negative effect on the ride comfort and ground adhesion. In order to solve this problem, a direct wheel drive system was proposed based on a silent chain integrated with semi-trailing suspension. The parameters of the drive motor and silent chain transmission device were collected from the requirements of the vehicle. The semi-trailing-arm wheel drive system was modeled and simulated with software ADAMS/Car, and the wheel alignment parameters were optimized with the help of software ADAMS/Insight.
Analysis of Coordinated Control of Electro-Mechanical Braking for Tracked Vehicles
SHENG Hui, GAI Jiang-tao, MA Tian, MA Chang-jun, HAN Zheng-da
2018, 38(S1): 195-199. doi:10.15918/j.tbit1001-0645.2018.增刊1.042
Abstract(819) PDF(244)
Abstract:
In this paper, the structure, the basic concept and importance of coordinated control of the electro-mechanical braking system was introduced for vehicles. Analyzing the current research status of the electro-mechanical braking system of civil vehicles at home and abroad and the research status of the electro-mechanical braking system of the domestic electric drive tracked vehicles, the future development trend of the coordinated control technology of the electro-mechanical braking system was put forward for tracked vehicle.
Roll and Yaw Stability Joint Control of In-Wheel Motors Drive Electric Vehicle
ZHANG Run-sheng, ZHANG Wei, ZHANG Si-long, ZHANG li-peng
2018, 38(S1): 200-204. doi:10.15918/j.tbit1001-0645.2018.增刊1.043
Abstract(893) PDF(240)
Abstract:
In order to improve the space stability of electric vehicle, a synergetic control was proposed for the yaw-roll motion control based on in-wheel motors and active suspensions. Firstly, analyzing the influence of in-wheel motors differential drive combined with active suspensions control on the yaw-roll motion of the vehicle body, a space stability control strategy was established. Then, taking the yaw rate and the slip angle as state variables, the yaw stability controller based on reference model was designed. Taking the steering wheel angle and lateral acceleration as the state variables, a feedforward controller based on roll restraining of the active suspension was designed. Taking the roll rate and roll angle as state variables, the roll stability controller based on feedback optimal control was designed. Finally, the four-wheel drive torque and active suspension force/torque coordination allocation rules were established, and the effectiveness of control strategies was verified by co-simulation. The research results show that, the differential driving of in-wheel motors can provide yaw stability control and roll assist control capability. Combined with the active suspension control, in-wheel motors driving can improve the vehicle yaw-roll motion state and greatly improve the space stability.
Optimal Control Strategy of Dual-Axis-Parallel PHEV Based on Optimal System Efficiency
WANG Wei-da, WANG Xian-tao, YAN Zheng-jun, XU Jin-song, WANG Yu, LI Xun-ming
2018, 38(S1): 205-210. doi:10.15918/j.tbit1001-0645.2018.08.044
Abstract(856) PDF(290)
Abstract:
In view of the control strategy and parameter optimization of the dual-axis-parallel plug in hybrid electric vehicle (PHEV), a joint optimization control strategy was proposed, analyzing the impact of engine and motor working area on vehicle economy, taking the torque distributing ratio and transmission gear as the optimization parameters, and taking the highest comprehensive system efficiency as the optimization target. Meanwhile, the cost function was introduced to coordinate the control of comprehensive system efficiency and gear shifting cost. Taking the lowest fuel consumption under the typical cycle condition as optimized objective, an adaptive simulated annealing (ASA) algorithm was used to optimize the parameters of the joint optimization control strategy based on the Isight-Cruise-Matlab joint optimization simulation platform. The simulation results show that, compared with the pre-optimization strategy, the parameter optimization strategy saved the oil consumption by 7.7%, and saved 17.3% compared with the initial rule strategy.
Modeling and Simulation Analysis for Mechanic and Electric Compound Drive Vehicle Based on GT-SUITE Software
LI Jiang-bin, WU Xue-lei, LI Hong-biao, LIU Yang, XIAO Kun
2018, 38(S1): 211-214. doi:10.15918/j.tbit1001-0645.2018.增刊1.045
Abstract(760) PDF(303)
Abstract:
The mechanic axles and electric driving axles of mechanic and electric compound driving vehicle can drive vehicle independently or simultaneously, which can improve the dynamical performance, fuel economy and driving reliability of vehicle. The simulation models of mechanic and electric compound driving components and dual axles vehicle were built based on GT-SUITE software. The bench test and simulation results of power unit and electric driving axle dynamic shifting were compared. Max speed and accelerate performance of the vehicle were simulated, verifying the correctness of the model.
Experiment Research on Key Parameters for Diesel-Electric Auxiliary Power Unit
YANG Bo, WEN Bo-xuan, LI Hong-biao, WU Xue-lei, WANG Wei-da, XU Yan-chao
2018, 38(S1): 215-220. doi:10.15918/j.tbit1001-0645.2018.增刊1.046
Abstract(725) PDF(286)
Abstract:
The performance and control strategy of diesel-electric auxiliary power unit (APU) is restricted by the basic performance of the diesel engine and the generator. Some key parameters play the main role, such as the ability of speed regulation for the diesel, the variance ratio of speed and the change rate of generator torque. Firstly, a test bench for APU was built and these key parameters were tested to get the boundary value of Diesel and generator, establishing a basis for optimization of the control strategy.
Modeling and Vibration Characteristic Analysis of Cab Isolation System for Electric Driving Vehicle
LIAO Xin, LI Shao-hua, YANG Shao-pu
2018, 38(S1): 221-225. doi:10.15918/j.tbit1001-0645.2018.增刊1.048
Abstract(852) PDF(579)
Abstract:
To solve the problem of low frequency vibration in the cab of electric vehicle, a finite element model of cab with four isolators was established, and the nonlinear spring damping element in three directions was proposed to replace the vibration isolators. The constrained modal analysis was carried out. According to the results of modal analysis, the causes of cab shaking were discussed, and on this basis, two methods were presented to improve the vibration isolator design and reduce cab shaking. Considering the actual application condition, a hydraulic damping rubber isolator was designed and analyzed to improve the ride comfort of the cab. In addition, the installation position of the isolator was adjusted to reduce the vibration of the cab effectively. Modal analysis results show that the frequencies of the modes are increased, and the fourth order vibration mode can be transformed to the local vibration of the rear wall of the cab. Finally, the vibration analysis of cab isolation system was carried out based on finite element simulation. The results show that the vertical amplitude of cab vibration isolation system under low frequency pavement displacement excitation is obviously reduced after adjusting the installation position of the isolator.
Trajectory Planning of Electric Vehicle Based on Improved Genetic Algorithm
LI Ai-juan, WANG Xi-bo, QIU Xu-yun, WANG Bao-yi
2018, 38(S1): 226-230. doi:10.15918/j.tbit1001-0645.2018.增刊1.049
Abstract(780) PDF(359)
Abstract:
The trajectory planning method for electric vehicle in complex dynamic obstacle environment is an important research of electric vehicle intelligent auxiliary driving technology. In order to make the electric vehicle running and steering steadily under a high speed driving condition, an improved genetic algorithm based trajectory planning method was introduced to optimize the generated trajectory. First, the quintic polynomial curve was used to generate a trajectory. Then, the improved genetic algorithm was used to optimize the parameters of quintic polynomial curve, making the parameterized trajectory satisfy the dynamic constraints. The real vehicle experiment results show that, the optimized trajectory can adapt the dynamic constraints rather than the pre-optimized trajectory, and can make the electric vehicle steering steadily under high speed driving condition.

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