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2022, 42(4)

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2022, 42(4): 1-2.

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Experiment Study on Damage Effect of Two Charges Internal Explosion in Multi-Cabin Structure

HU Hongwei, XIAO Chuan, FENG Haiyun, SONG Pu

2022, 42(4): 331-339. doi:10.15918/j.tbit1001-0645.2021.154

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To study the damage effect of simultaneous explosion of two charges in different cabin structure, some explosion tests were carried out for the condition, TNT charges with the same mass, explosion in single and four cabins with simulated cabin structure. The tests were arranged to analyze the matching relationship between charge mass and cabin volume, and the influence of charges location on the damage effect of four layer cabins. The results show that group charge detonation in single layer cabin can result in the serious tearing and throwing, but the damage effect of the whole structure is not remarkable. According to the damage quantity of cabin, the damage effect of two charges (the mass of each charge equals 1/2 mass of group charge) in two different cabins is better than that of group charge with the same mass in one layer cabin. The energy superposition and diffusion caused by the charge position have a great influence on the damage effect of multi layer cabins. The better explosion position of the group charge is the middle cabin, and the better explosion position of two charges is the adjacent cabins or compartment in the middle, and the damage effect of one compartment is the best.

Enhancement Effect of Initiation Methods on Shock Wave Power in Near-Ground Field Explosive

SHI Liping, WANG Chenglong, WU Hongbin, SHI Wenqing, XUE Zaiqing

2022, 42(4): 340-346. doi:10.15918/j.tbit1001-0645.2021.162

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In order to investigate the influence of both end initiation explosive on the shock wave power distribution in the near-ground field, experiment and simulation analysis were carried out. The results show that in both end initiation, the initial shock wave is coupled to the convergent center of detonator and boosted up, and then propagates horizontally in the circumferential direction from the central converging position in the air, significantly enhancing the propagation distance and overpressure power of shock wave in the near-ground field. Compared with the explosive detonation initiated at one end, in the scaled distance of 1.5 m·kg^−1/3to 4.5 m·kg^−1/3, the power of the near-ground field shock wave initiated at both ends is significantly increased. The shock wave overpressure in the scaled distance range is increased by an average of 43%, and the increase is most obvious in the scaled distance from 2.5 m·kg^−1/3to 3 m·kg^−1/3.

Research on Damage Evaluation of Fragmentation Warheads Against Early-Warning Aircraft

ZHANG Ruiwen, PEI Yang, HOU Peng, GE Yuxue

2022, 42(4): 347-358. doi:10.15918/j.tbit1001-0645.2021.165

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In this paper, a method of damage effect analysis was established to evaluate the damage of fragmentation warheads on early-warning aircraft (EWA). The method considers the vulnerability model of mission systems as well as the detection and detonation processes of proximity fuzes. The mission-level model of the kill tree was established based on the characteristics of EWA mission systems. The detection position of fuzes was calculated by the scan line method, and the optimal detonation position was calculated with the target configuration in the coordinate system of the relative velocity considered. The damage probability was calculated by the Monte Carlo method. The effects of intercept conditions, detonation delays, guidance precision, and aiming centers on damage probabilities were analyzed. The results show that, self-adaptively-delayed detonation significantly increases kill probabilities, and reduces the influence of intercept conditions, which decreases with increasing guidance precision; for self-adaptively-delayed detonation, the damage probability is mainly influenced by the exposure area and the aiming center, and higher kill probabilities happen when the geometry center is targeted.

Method for Judging Mission Abort Kill of Aircraft with Rudder Jam Based on Flight Range

CHEN Zhiwei, PEI Yang, GE Yuxue, PENG Qiancheng, YUAN Jie

2022, 42(4): 359-365. doi:10.15918/j.tbit1001-0645.2021.166

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To study the effect of rudder jam caused by missile strike on the ability of an aircraft to perform missions, a method to judge mission abort kill based on flight range was proposed. The aircraft trim process was discussed with the vertical and horizontal aerodynamic coupling caused by the rudder jam taken into consideration. The remaining flight range was calculated based on the trim solution of the damaged aircraft. The range threshold was calculated according to the flight mission profile, and it was compared with the remaining range to judge mission abort kill. Simulation examples were set and range losses of aircraft under different jammed angles were calculated, verifying the feasibility of the proposed method for judging mission abort kill. Results show that range loss caused by a small-angle jam is short. As the angle jam increases, the range loss increases rapidly and eventually leads to mission abort kill, and the range loss can reach 50%.

Research on Explosion Damage Effect of Directly Buried Through Pipe Optical Cable in Sand

LUO Dan, HU Jinsheng, HUANG Zhenyu, XU Xiangyun, ZHANG Yi, ZHANG Wei, LIU Sheng

2022, 42(4): 366-373. doi:10.15918/j.tbit1001-0645.2021.192

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The explosion damage mechanism and vulnerability of the directly buried through pipe optical cable were studied. A prototype test of short-distance explosive failure of 55 kg columnar TNT bare powder sand was designed and carried out for a 60 mm diameter steel pipe penetrating GYTA33 optical cable. Test results show that when the proportional explosion distance was 0.316 m/kg, the communication function of the cable was good; when the steel pipe was obviously bending and was deformed by compression, the communication was interrupted when the proportional explosion distance was 0.263 m/kg. The critical failure proportional explosion distance of the cable in sand was between 0.263 m/kg and 0.316 m/kg. The corresponding numerical simulation calculation was carried out to analyze the failure mechanism of the through pipe cable. The results show that the local bending and radial compression deformation of the steel casing will occur under the near blast load, and the failure of the optical cable is mainly caused by the high-speed stamping of the steel casing in the initial stage of severe compression deformation.

Vulnerability Analysis Method for Power Cyber Physical System

CHEN Yasha, FENG Fuqiang, OU Yuan, SHI Genzhu, YAN Xuefei

2022, 42(4): 374-382. doi:10.15918/j.tbit1001-0645.2021.213

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Aiming at the current difficult subjects of complex power cyber physical systems(CPS) system, network coupling and vulnerability analysis, a damage tree model of power CPS was established based on the research results of power system damage assessment in recent years. Considering the node importance and fault cascade damage characteristics of power CPS network, a vulnerability analysis method was proposed based on node importance for power CPS, and analyzed and illustrated with examples. Results show that the model can be used to study the survivability of power cyber physics system and can provide a support for the design and improvement of target damage resistant structure.

Research on the Effect of Jet Action Conditions on Interference Duration of Heavy Reactive Armor

YU Qingbo, ZHONG Shiwei, WANG Jian, GE Chao

2022, 42(4): 383-389. doi:10.15918/j.tbit1001-0645.2021.080

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In order to study the effect of jet action condition factors such as inclination angle and standoff of the shaped warhead on the interference duration of heavy reactive armor, a calculation model of jet action conditions affecting the interference duration of the heavy reactive armor was established by a combination of numerical simulation and theoretical calculation. The law of the influence of different inclination angles on the flying characteristics of the explosive reaction armor and the duration of the interference field was obtained. Numerical simulation results show that the blast height of the inclination angle has a significant effect on the flying behavior of the reactive armor flying plate and the action time of the interference field; the flying speed and the peak acceleration of the flying plate decrease with the increase of the inclination angle; as the blast height increases, the peak value first increases and then decreases. When the explosion height is small (2d_c), the interference time increases with the increase of the inclination angle; when the explosion height is great, the interference time decreases with the increase of the inclination angle. The numerical simulation results and the theoretical calculation results match well.

Nonlinear Analysis of Silicon Microresonator with Vibrating Beam Integrated with Comb Fingers Structure

ZHOU Chunyan, HU Bo

2022, 42(4): 390-397. doi:10.15918/j.tbit1001-0645.2021.088

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The output signal of the resonant MEMS sensor is a frequency signal, which has the advantages of high precision and strong anti-interference ability. It is one of the important development directions of micro sensors. However, the non-linearity of the vibration of this type of sensor will cause vibration amplitude noise to be coupled to the frequency output and adversely affect the noise performance of the device. Therefore, it is very important to analyze the nonlinear vibration characteristics of the resonant accelerometer. Taking the resonator with vibrating beam integrated with comb fingers structure as research object, the force-displacement equation and the vibration differential equation of the resonant beam were derived. Compared with the experimental results, the curves are in good agreement, which proves the correctness of the theory. At the same time, the results show that the mechanical nonlinearity of the structure is mainly affected by the thickness of the resonance beam; the critical state of nonlinear instability will cause the structure to jump in frequency. Increasing structural damping can effectively increase the displacement of the stable response of the system and the output voltage signal. In addition, devices designed under the jump-up frequency after structural nonlinear instability have good stability.

Study on Braking Characteristics of the New Tooth Band Brake

MA Biao, WANG He, ZHENG Changsong, YANG Renqi, ZHU Li'an

2022, 42(4): 398-406. doi:10.15918/j.tbit1001-0645.2021.107

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In order to improve the dynamic and economy of electric tracked vehicle, a new tooth band brake was designed to replace the wet multi-plate clutch in the planetary transmission. A numerical model of the braking process was proposed based on the structure and working mechanism of tooth band brake. The variation law of parameters was studied, including the rotating angle and speed, as well as the braking torque of the brake drum. Moreover, a bench test was conducted to verify the feasibility of the brake structure and the correctness of numerical model. The results show that the initial rotational speed of the brake drum has a dramatic effect on the braking time and braking torque; the higher the rotating speed is, the shorter the braking time and the greater the braking torque. Compared with the original device, the new structure, can not only increase the braking speed range, but also provide better working reliability and application prospects.

Gait Parameters Optimization and Exploratory Walking Strategy for Quadruped Robots

ZHAO Jiangbo, GONG Sijin, WANG Junzheng

2022, 42(4): 407-414. doi:10.15918/j.tbit1001-0645.2020.215

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In order to realize the stable motion of the quadruped robot under the conditions of complex terrain environment, limited energy supply and unpredictable interference, and to improve the ability of the quadruped robot to traverse complex terrain, the particle swarm optimization algorithm was used to optimize the classical walking gait parameters. An exploratory gait was proposed, being of easy implement and adapt to different terrains. Needing not any terrain information sensed by stereo vision or LIDAR, the proposed exploratory gait was arranged with the IMU sensor and the foot force sensor to make the robot sense terrain directly. Several simulations and experiments were carried out for the proposed optimization method and gait strategy, verifying the performance of the proposed exploratory gait on uneven terrain.

Color Image Encryption Based on Three-Dimensional Piecewise Sine Map

WANG Yong, GONG Jian, WANG Mingyue

2022, 42(4): 415-423. doi:10.15918/j.tbit1001-0645.2021.084

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Due to the pseudo-randomness of chaotic map and its sensitivity to parameters and initial values, it can enhance the performance of image encryption algorithm. And due to the simple structure and high transmission efficiency of Sine map, it can be widely used in the field of image encryption. In the security application sense, there are some problems in Sine map, i.e. the Lyapunov exponent is too small and the probability density distribution is not uniform. In order to overcome the shortcomings of Sine map in chaotic cipher design, a parameter coupled piecewise sine map (PCPSM) was proposed, and a three-dimensional chaotic model (3DPCPSM) was constructed using PCPSM as the basic unit. Then, a new color image encryption algorithm based on 3DPCPSM was proposed. In the encryption algorithm, two elementary transformation matrices were constructed based on three pseudo-random sequences output from the model, scrambling the RGB information of the color image. And then, an integer sequence was constructed by extracting state values from the model, and the scrambled image was diffused to generate encrypted image. Simulation experiments and performance analysis show that the scheme is safe and reliable, and can effectively meet the needs of secure image transmission in the network.

Research on a Vision-Based Suspicious Target Recognition Algorithm in Reservoir Area

LI Xiangrong, CHEN Yongkang, WANG Zhigang, LUO Xin, LI Chenxiao, HOU Xiang

2022, 42(4): 424-429. doi:10.15918/j.tbit1001-0645.2021.106

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Aiming at the requirement of intelligent recognition of image targets by the storage area inspection image acquisition equipment, a vision-based long-distance suspicious target recognition algorithm was designed and implemented. Firstly, a target detection method was used to identify and collect the target image. And then, the convolution layer of the deep learning model based on convolutional neural network was used to extract the features of the target image, and the shallow network based on the traditional machine learning method was used to classify the suspicious target. Finally, an experiment was designed according to the algorithm. The experimental results show that the algorithm model can improve recognition effect, can effectively reduce the workload of manual recognition, and can meet the requirements of actual application.

Design Method of High Precision Buck-Boost Converter Based on Dynamically Trimming Error Amplifier

GUO Zhongjie, LU Hu, CAO Xitao, LIU Nan, LIU Shen

2022, 42(4): 430-436. doi:10.15918/j.tbit1001-0645.2021.242

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The traditional modification scheme is to trim the system by changing the feedback coefficient of the resistance feedback network. However, the method, arranged for the feedback resistance trimming at a specific output voltage, can not ensure the precision of different output voltage configurations. To solve the problem, analyzing the working characteristics of the loop and starting at fixed operating point of the error amplifier, a design method of high-precision Buck-boost converter was proposed based on dynamic adjusting of the current of the error amplifier. Based on 0.18 μm BCD process, the circuit design and physical implementation were carried out to verify the proposed method. The results show that the output voltage error can be reduced from ±40 mV to ±1.83 mV, and the output voltage accuracy can reach 0.0457%. When the output voltage error is less than or equal to 5 mV, the maximum error is 62.83 mV. Compared with the traditional structure, the precision of the modified voltage is less affected by the change of PVT, which greatly improves the output accuracy of the system. The method has been successfully applied in a Buck-Boost converter.

Safety Analysis of Weapon System Based on Multi-View Modeling

NIE Zhaowei, CHEN Zhiwei, MA Xiaodong, XU Cheng

2022, 42(4): 437-446. doi:10.15918/j.tbit1001-0645.2021.275

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With the deepening of actual combat requirements of weapon equipment, the mission profile of the weapon systems is becoming more complicated. Because of the concentration of weapon hazard sources, the risk of failures and dangerous accidents is widespread, and the safety problem is prominent. In this paper, a multi-view mission profile model was established firstly, taking process view as the core and function view, organization view, information view, resource view, and time sequence logic view as the supplementary elements to identify weapon system. Then, a formal modeling language SysML was used to build the multi-view model of the weapon mission process, and the complex mission profile of the weapon system was described from multiple perspectives. Finally, the weapon system safety analysis method was established based on the SysML view model. A land-based missile weapon system was taken as an example to study the mission profile modeling and safety analysis method based on multi-view, providing a theoretical and technical support for improving the weapon system safety analysis.

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2022 Vol. 42, No. 4

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