Table of Content

31 July 2019, Volume 40 Issue 7

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Contents

2019, 40(7):  0. 

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Paper

Stability Criteria for Limiting Conical Motion of Rotary Fin-stablized Projectiles

CHEN Liang, LIU Rongzhong, GUO Rui, XI Taotao, LI Peilin, ZHU Guili, YANG Yongliang, XING Boyang, GAO Ke

2019, 40(7):  1329-1338.  doi:10.3969/j.issn.1000-1093.2019.07.001

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A modified theoretical model is developed to analyze the limiting conical motion characteristics of rotary fin-stablized projectiles. The amplitude plane equation of projectiles in the state of quasi-circular motion is expanded as Taylor series, by which the value change of the square-root term in the amplitude plane equation is fully considered. The existence and stability of the nonzero singular points for the amplitude plane equation are analyzed comprehensively according to the different parameter values. The analytic criteria are presented, which present the necessary conditions for the formation of stable conical motion under the action of nonlinear static moment and nonlinear Magnus moment. Furthermore, two condition expressions denoted as J₁>0 and J₂>0, which just relate to the initial parameters of the angle-of-attack equation, are claimed as the comprehensive criterions in this paper and are used for the primary analysis of conical motion stability. Finally, a rotary fin-stablized projectile with known aerodynamic and structural parameters is taken as an example to verify the theoretical critera. The results indicate that the stability criteria for the limiting Conical Motion of rotary fin-stablized projectiles proposed in this paper are more comprehensive and explicit than those of the current theory. Based on the proposed criteria, the characteristics of limiting conical motion can be analyzed and estimated conveniently and effectively. Key

Dynamic Simulation on Nonlinear Vibration of Marching Tank Gun under High Mobility Conditions

CHEN Yu, YANG Guolai, FU Yuchong, SUN Quanzhao

2019, 40(7):  1339-1348.  doi:10.3969/j.issn.1000-1093.2019.07.002

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A novel dynamic co-simulation methodology is presented to establish a mechanical-electrical-hydraulic integrated dynamic model of marching tank for studying the nonlinear vibration of marching tank under high mobility conditions. A property hydraulic subsystem model is established in Amesim, a tank mechanical system model, in which several nonlinear factors, such as barrel flexibility, are considered, is builded using RecurDyn, and a control system model is also builded using MATLAB/Simulink. A calculation program of the three-dimensional road roughness considering the coherence of left and right tracks was created using the sinusoid superposition method. The calculated results show that the muzzle vibration amplitude is larger than that of cradle because of barrel’s flexibility. When the road roughness is small and the running speed is low, the muzzle bends downward relative to the cradle. With the increase in road roughness and running speed, the stability of hull and cradle is getting worse, and the stabilizer cannot guarantee the stabilization accuracy. The difference of elevation angular displacement between muzzle and cradle caused by barrel’s flexibility is significantly reduced. Therefore, the influence of barrel’s flexibility on the firing accuracy cannot be solved by static correction simply, and the driving condition should be considered. Key

An Effective Method for Imbalanced Sample Generation and Its Application in Fault Diagnosis of Planetary Gearbox

WU Chunzhi, FENG Fuzhou, WU Shoujun, CHEN Tang, JIANG Pengcheng

2019, 40(7):  1349-1357.  doi:10.3969/j.issn.1000-1093.2019.07.003

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A fault diagnosis classification model based on WGAN-CNN is proposed for few fault data of planetary gearbox and the imbalanced samples of each state in actual operation. The proposed model is a combination of Wasserstein generative adversarial network (WGAN), a sample generation model, a convolutional neural network (CNN), and a sample classification model. The model is used to oversample the spectral signals of fault data and expand the number of fault samples, thus classifying the fault states better. UCI artificial datasets were used to compare WGAN generation model and classical oversampling methods, and verified on a planetary gearbox fault test rig. The results show that the imbalanced samples seriously affect the classification results, and the WGAN-CNN model can well expand the fault sample datasets and improve the diagnostic accuracy in the case of rare fault samples. Key

Research on Dynamic Oil-filling Cushioning Properties of Locking Clutch in a Hydrodynamic Transmission Vehicle

WEI Wei， PENG Hui， LIU Xu， JIAN Hongchao, XIE Wenhao, YAN Qingdong， ZHU Haoyue

2019, 40(7):  1358-1364.  doi:10.3969/j.issn.1000-1093.2019.07.004

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The dynamic cushioning properties of locking clutch for a hydrodynamic transmission vehicle are studied to improve the locking quality in the transition process from hydrodynamic transmission operating condition to mechanical condition, in particular, to reduce the impact in vehicle's locking process.The dynamic models for hydrodynamic torque converter with locking function and its input and output components are established. And the effects of oil-filling, buffer boosting, and step boosting on the locking quality during locking are analyzed. The optimal Latin hypercube design method is used to optimize the buffer slope in the buffer boost stage. The quality evaluation parameters, such as jerk, sliding time and sliding work, before and after optimization are compared using the proposed locking quality evaluation function. A locking characteristic test verification bench was built to verify the locking qualities before and after optimization. The results show that the proposed dynamic system simulation model can be used to accurately predict the dynamic locking process. The locking quality after optimization is significantly improved compared with the result before optimization, and the impact is significantly reduced. Key

Aftereffect Overpressure of Reactive Jet Perforating into Reinforced Concrete

ZHANG Hao， WANG Haifu， YU Qingbo， ZHENG Yuanfeng

2019, 40(7):  1365-1372.  doi:10.3969/j.issn.1000-1093.2019.07.005

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In order to investigate the aftereffect overpressure characteristics of reactive jet penetrating into reinforced concrete, the experimental, theoretical and numerical simulation methods are used to study the aftereffect overpressure characteristics of reactive liner shaped charge against reinforced concrete. Experimental results show that, for the same shaped charge configuration, the low density reactive jet produces a larger diameter penetration hole on the reinforced concrete and a higher peak overpressure in a closed space compared with the high density reactive jet, and the overpressure-time curves reveal multi-peaks phenomenon. An equivalent model for aftereffect deflagration overpressure of reactive jet and high explosive explosion is developed by using the virtual explosion point method.AUTODYN-3D finite element analysis shows that the predicted aftereffect overpressure-time curves are well agreement with the experimental results, and the propagation characteristics and multi-peaks phenomenon of reactive jet in the closed space are also revealed. Key

Micro-structure and Active Aluminum Content of Aluminum Powder in Situ Coated by Polyvinyl Alcohol

WANG Huixin, REN Hui, YAN Tao, LI Yaru

2019, 40(7):  1373-1380.  doi:10.3969/j.issn.1000-1093.2019.07.006

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In order to solve the decrease in the reactivity of nano-aluminum powder due to the alumina shell on its surface, the nano-aluminum powders were directly encapsulated by polyvinyl alcohol (PVA) during electrical explosion of wires. The apparent morphology of sample was detected by scanning electron microscope (SEM) and transmission electron microscope (TEM), and the particle size distribution was characterized by dynamic laser light scattering particle size analyzer. The valence states of surface elements were analyzed by X-ray photoelectron spectroscope, and the thermal behaviours of micrometer Al, nanometer Al and products were compared by simultaneous thermal analyzer. The combustion heat was measured according to relevant national military standards, and active Al content was measured using NaOH exhaust method. The results show that the average size of coated sample is nearly 200 nm, and the particles form a multi-core structure. The active Al content reaches 84.27% which is 22% higher than that of ordinary nano-Al particles. It was proved that PVA effectively relieves oxidation of nano-Al. The coated products have low onset temperature of oxidation (548.6 ℃) and can release energy more rapidly compared to micro-Al. The in-situ coated sub-micro Al has high active reactivity and quick energy release rate. Key

Numerical Characterization of Dynamic Damage of PBX Explosive

WEI Qiang, HUANG Xicheng, CHEN Gang, CHEN Pengwan

2019, 40(7):  1381-1389.  doi:10.3969/j.issn.1000-1093.2019.07.007

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The safety assessment of PBX explosive is inseparable from the characterization of its mechanical response and damage. In order to accurately capture the mechanical behavior of PBX explosive, the numerical characterization method of PBX explosive mechanical behavior is studied based on Karagozian & Case (K&C) model framework. The damage evolution mode in the K&C model is modified, and the pressure-dependent characteristics of PBX explosive modulus and damage evolution mode are considered. Based on a series of published experimental data, the strain rate effect in the K&C model was corrected, the ratio of tension to compression meridian of PBX under different pressures was discussed, the deformation localization in the process of structural damage was dealt with, and the treatment of the tensile failure unit in the calculation was presented. The proposed model can be used to well depict the cratering morphology of explosive specimen in the Steven test, and successfully capture the tensile and shear failure images of explosive specimen. Key

An Air Alignment Method for the Roll Angle of Rolling Missiles with Velocity Matching and Maneuvering Assistance

PENG Bo, CEN Mengxi

2019, 40(7):  1390-1400.  doi:10.3969/j.issn.1000-1093.2019.07.008

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A method of satellite/inertial velocity matching and maneuvering assistance is proposed to solve the problem of low accuracy of aligning the roll angle by a satellite/inertial velocity matching method. In the satellite/inertial integrated guidance mode, on the basis of observability analysis, a longitudinal proportional guidance law with gravity compensation is used in the maneuvering assistance, and Kalman filter is used to complete the air alignment of roll angle. The influences of maneuvering assistance strategy on the aligning effect of roll angle are analyzed in the case of different navigation ratios and gravity compensation coefficients, and the influences of nominal rotating speed deviation and inertial system error deviation on maneuvering assistance strategy are also analyzed. Simulated results show that the proposed method can be used to realize the precision alignment of roll angle in the whole trajectory with the error of less than 2° and the convergence time of 10 s under the condition of satellite and inertial system errors, and the speed and precision of alignment can be changed by adjusting the gravity compensation coefficient. The navigation ratio is used to ensure the stability of guidance loop. Moreover, under the condition that the deviations exist in the nominal rotating speed and the inertial system errors, the alignment effect is less affected and the anti-interference ability is stronger. Key

Infrared Image Occlusion Interference Detection Method Based on Deep Learning

LIANG Jie, LI Lei, REN Jun, QI Hang, ZHOU Hongli

2019, 40(7):  1401-1410.  doi:10.3969/j.issn.1000-1093.2019.07.009

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The occlusion interference of smoke screen and cloud can change the target characteristics and cause the target identification errors when an infrared imaging system detects and identifies a target. The targeted processing during the identification process can greatly reduce the identification false alarm rate and improve the anti-interference ability of identification by performing the positioning and type judgment of occlusion interference area. To this end, an infrared image thick cloud and smoke screen occlusion interference detection method based on improved deep learning single channel detector is proposed. In the proposed method, the multi-scale prediction is realized by multiplexing and merging the multi-layer features of network, and the detection precision is inceased by using the dynamic anchor frame module to improve the anchor frame mechanism. The detection speed is inceased by merging the convolutional layer and the batch normalization layer in the network, and the classification ability of network for the obstruction is improved by introducing the central loss function to optimize the classification function. An infrared sample augmentation method is proposed for network training, which effectively expands the data volume and solves the problem of difficult acquisition of infrared image training samples. The experimental results show that the proposed method is used to improve the detection accuracy by 3.7% at the same speed, which effectively solves the problem of weak anti-interference ability of infrared automatic target recognition system in complex environment. Key

Implantation and Application of Ignition and Growth Reaction Rate Equation in LS-DYNA Software

MIAO Feichao， ZHOU Lin， ZHANG Xiangrong， CAO Tongtang

2019, 40(7):  1411-1417.  doi:10.3969/j.issn.1000-1093.2019.07.010

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An ignition and growth reaction rate equation with 10 parameters is implanted into LS-DYNA software to precisely describe the shock initiation of explosives and simplify the calibration of reaction rate equation. The reaction rate equation is used to simulate the shock initiation of a DNAN-based melt-cast explosive. The parameters of the reaction rate equation are calibrated by comparing the pressure-time curves in experiment and simulation, and the advantages of the reaction rate equation are analyzed. The results indicate that the reaction rate equation can be easily calibrated due to a few number of parameters. The difference between the simulated and experimental arrival times of shock wave does not exceed 0.2 μs, and thus the reaction rate equation can be used to precisely describe the shock initiation of explosives. The algorithm for implanting the reaction rate equation in LS-DYNA software is efficient because the iterations for every grid does not exceed 3 times.Key

Fracture Characteristics of Metal Cylinder Shells with Different Charges

YU Fuyou, DONG Xinlong, YU Xinlu, FU Yingqian

2019, 40(7):  1418-1424.  doi:10.3969/j.issn.1000-1093.2019.07.011

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Expansion experiments of TA2 titanium alloy cylindrical shells with different thickness charges were carried out to study the effect of explosive load on fracture process of metal cylindrical shells, and the recovered fragments was microcosmically analyzed. The experimental results show that，when solid charge is used， the adiabatic shear bands distributed at 45° or 135° occur in the inner wall of TA2 cylindrical shell, and the cracks on the inner wall expand along the adiabatic shear bands to cause the fracture of shell; when a 1.9 mm-thick cavity charge is exploded, the cylindrical shell still exhibits a shear fracture mode, but the cracks are first generated in the center of the cross-section of cylindrical shell and extend to the inner and outer surfaces. As the thickness of cavity charge is decreased to 1.2 mm, the damage zone in the center of the cross-section of cylindrical shell is wider and the spallation occurs. The analysis shows that the fracture mode and mechanism of cylindrical shell are related to the explosion pressure and the ratio of load pulse width to wall thickness, which is a process involving the propagation of shock wave along the thickness and the competition of multiple physical failure mechanisms. Key

Research on Optical Depth Surrogate Model-based Method for Estimating Fog Density and Removing Fog Effect from Images

LI Chunming， JIANG Yutong， SONG Haiping， JI Chao， GUO Meng， ZHU Lin

2019, 40(7):  1425-1433.  doi:10.3969/j.issn.1000-1093.2019.07.012

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The images are vulnerable to suspended particles in the atmosphere, and the quality of image captured in fog is deteriorated to lead to many difficulties for battlefield reconnaissance and recognition. Various fog-related image features are investigated, and a novel feature based on chroma, saturation, and Brightness value color space which correlates well with the fog density is proposed. The surrogate-based method is used to build a refined polynomial regression model for optical depth with informative fog-related features, including the dark-channel, saturation-value, and chroma. An effective method for fog density estimation and image defogging is proposed based on the surrogate model. Experimental validations prove that the proposed method has better effect than conventional methods in both quantitation and quality, and leads to great improvements in real-time image defogging. Key

Thick Cloud Removal for Aerial Images Based on Deep Convolutional Generative Adversarial Networks

LI Congli, ZHANG Siyu, WEI Zhe, XUE Song

2019, 40(7):  1434-1442.  doi:10.3969/j.issn.1000-1093.2019.07.013

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A thick cloud removal method for aerial images based on deep convolution generative adversa- rial network (DCGAN) is proposed. In the proposed method, a region covered by cloud in image is regarded as a missing part in the image inpainting, and the adversarial learning of convolutional neural network is used to compensate the missing information. A DCGAN model including generator-discriminator is designed. The generator is an encoder-decoder structure with a joint loss function, including reconstruction loss, adversarial loss and total variation loss. The discriminator is used to measure the authenticity of the generated image with a loss function of adversarial loss. The prediction performance of network is improved by iterating the joint optimization of generator and discriminator. Poisson image editing is introduced to reduce the influences of color difference and boundary artifact. The experimental results on both simulated and real cloud images show that the proposed method is better than the classic method in terms of peak signal to noise ratio, structural similarity index measure, natural image no-reference quality evaluation algorithm and its improved algorithm, and has a small computational complexity. Key

Research on Infrared Molecular Faraday Imaging Filter Technology

XIONG Yuanhui， LUO Zhongjie， YU Guangbao， LIU Linmei， LI Faquan， WU Kuijun

2019, 40(7):  1443-1449.  doi:10.3969/j.issn.1000-1093.2019.07.014

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Infrared molecular Faraday imaging filter (MOFIF) is a novel type of filtering device with comb-like discrete transmission spectrum. Its transmission spectrum is determined by the energy level transition of the molecule, which provides both high spectral resolution and high optical stability. A theoretical model of molecular Faraday optical filter (MFOF) is established by studying Faraday optical rotation effect. And the transmission spectrum of MFOF is measured by using a quantum cascade laser spectrum technology. The application of this technology in infrared imaging detection system is discussed. Preliminary experimental study on combustion diagnosis based on infrared MOFIF technology is also conducted. Pure NO images uninfluenced by H₂O infrared radiation were captured in the combustion environment. The experimental results show that MFOF has strong practicability and obvious superiority in infrared imaging remote sensing detection, especially in the detection of trace components in combustion systems. Key

Analysis about Functional Invulnerability of Convergent Network Based on Function Chain

LI Eryu, GONG Jianxing, HUANG Jian

2019, 40(7):  1450-1459.  doi:10.3969/j.issn.1000-1093.2019.07.015

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As the existing combat network model is abstracted and the study on network functional complexity is not sufficient enough, an analysis method for functional invulnerability of convergent networks is presented. A complex convergent network model of combat system is established, which deals with hetero- geneous and convergent nodes in a single-layer network, and a new concept of function chain is proposed. The functional participation and functional importance of nodes are defined by function chain. On this basis, the functional integrity is defined as the measure of network functional invulnerability. Three attack modes are adopted in experiment: the first is random attack when network information is unknown, the second is intentional attack as network information is known incompletely, including attacking according to node degree, and the third is intentional attack within network information is known, including attacking according to functional importance and greedy algorithm. Experimental results show that the network has a higher robustness against random attack; it has less robustness against intentional attack in the case of incompletely known information ; and it has more less robustness against intentional attack in the case of known information.Key

Application of Hermite Fractional Time Delay Filter in Simulation of Inverse Beamforming of Sonar Signal Source

WANG Lening， YU Min， YAO Zhixiang, ZHANG Xiaoliang

2019, 40(7):  1460-1467.  doi:10.3969/j.issn.1000-1093.2019.07.016

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For the phenomena that amplitude-frequency and group delay characteristics of traditional fractional delay filters deteriorate at the high-frequency band of signal, a time delay filter based on the Hermite interpolation polynomial is proposed to approximate the system function of the ideal non-integer delay filter. A Farrow-type structure is established to solve the excessive attenuation and variable delay in the high-frequency part of array sonar signal source simulation. Simulated and experimental results show that the frequency response of Hermite fractional delay filter is better than that of the traditional fractional delay filter, and the mean square error in the entire normalized frequency band is only 8.18%. In beamforming, the Hermite fractional delay filter has a smaller attenuation at the high frequency band, making its beam pattern have a smaller sidelobe level. The mean square errors of simulation and experimental signals are kept in about 0.97%, which verifies the effectiveness of Hermite fractional delay filter. Key

Ship Static Electric Field Tracking Based on Filter Bank

YAN Bing， SUN Baoquan， ZHANG Jiawei

2019, 40(7):  1468-1475.  doi:10.3969/j.issn.1000-1093.2019.07.017

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A new filter algorithm based on filter bank is proposed to solve the problem on lack of prior information in ship static electric field tracking. A state space model of ship static electric field tracking is established, the static electric field of ship is modeled by using a horizontal electric dipole, and a set of filters is used to track a target by taking a progressive update extended Kalman filter as a basic unit. An initial value selection method is designed according to the electric field calculation formula, and the reliable tracking trajectory is selected by using the maximum likelihood method. Simulation and sea electric dipole tracking experiment show that the filter bank method can be used to effectively solve the problem of lack of prior information in ship electric field tracking, the maximum likelihood selection method can be used to select the correct tracking trajectory, and the algorithm is more sensitive to the azimuth information. Key

Influence of Towed Cable on Maneuverability of Underwater Vehicle

DU Xiaoxu， ZHANG Xiaolian

2019, 40(7):  1476-1484.  doi:10.3969/j.issn.1000-1093.2019.07.018

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In order to explore the impact of towed cable on the maneuverability of underwater vehicle, a dynamic equation of the towed cable is established based on the lumped mass method, the boundary coupling conditions are used to introduce the tension effect generated by the head end of towed cable into the 6-degrees-of-freedom equations of motion of underwater vehicle, and the coupling motion models of towed cable and ship are established. The influence of towed cable on the maneuvering performance of straight sailing, rotary motion and dive movement of underwater vehicle is compared and analyzed through numerical simulation. The numerical analysis results show that the speed of underwater vehicle during straight sailing, rotary motion and dive movement is reduced after the underwater vehicle is equipped with towed cable. When the underwater vehicle rotates, the towed cable reduces the radius of gyration. When the underwater vehicle dives, the towed cable reduces the dive stability of underwater vehicle and the absolute value of ballistic inclination of underwater vehicle, thus increasing the distance to the predetermined depth, and at the same time, the time for the underwater vehicle to reach the predetermined depth increases due to the reduction of speed, which also reduces the dive performance of underwater vehicle. Key

Camouflage Effect Evaluation Based on Hyperspectral Image Detection and Visual Perception

MA Shixin, LIU Chuntong, LI Hongcai, WANG Hao, HE Zhenxin

2019, 40(7):  1485-1494.  doi:10.3969/j.issn.1000-1093.2019.07.019

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For the target camouflage evaluation in hyperspectral reconnaissance, a novel evaluation method of hyperspectral camouflage effect is proposed based on detection and perception theory. The local anomaly detection operator is adopted to extract the difference value among each pixel and the surrounding pixels. On this basis, the potential target areas are acquired using the space density clustering and neighborhood fusion algorithm. The significant indicators reflecting the spectral differences and overall camouflage characteristics are established, and a new idea about hyperspectral camouflage evaluation based on the limited-time search strategy is proposed to evaluate the camouflaged targets from multiple aspects, such as search time and evaluation score. Simulated results show that the proposed method is used to overcome the problem of single evaluation index of traditional evaluation method based on multi-feature description, and give the objective and accurate evaluation conclusion. Key

Study of Friction Torque Characteristics of YRT Rotary Table Bearing

ZHANG Zhanli, ZHOU Pengju, LI Wenbo, WANG Hengdi

2019, 40(7):  1495-1502.  doi:10.3969/j.issn.1000-1093.2019.07.020

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In order to study the friction torque characteristics of YRT rotary table bearing, a friction torque model is established based on the static numerical analysis. The friction torque model was verified through experiment. The effects of operating parameters, axial clearance and roller crowned types on the friction torque characteristics of YRT rotary table bearing are studied. The result shows that the friction torque is mainly produced by the upper roller when the YRT rotary table bearing is subjected to axial load, and there is an inflection point on the curve of the total frictional torque which is basically proportional to the axial load before and after the inflection point, but the ratio coefficients are different. In the low speed range, its friction torque increases gradually with the increase in rotating speed, but the overall variation range is small. The friction torque of YRT rotary table bearing increases with the decrease in axial clearance, and the ratio coefficient increases gradually. A convex circular arc relieved end roller can be used to reduce the friction torque. Key

Application of Multi-sample Genetic Algorithm in Weapon Exterior Ballistics Networking Test

GONG Zhihua， DUAN Pengwei， LIU Yang， CHEN Chunjiang， L Haidong

2019, 40(7):  1503-1510.  doi:10.3969/j.issn.1000-1093.2019.07.021

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For the networking measurement mode of exterior ballistic in weapon test, the optimal disposition of test equipment is studied to ensure the optimal ballistic measuring precision. Based on the point-by-point least squares solution model, the root-mean-square of total cumulative error of ballistic parameters is designed as precision evaluation criterion. Considering the nonlinear constraints of solution space in actual situation and focusing on the probability characteristics of genetic algorithm, a complete multi-sample genetic algorithm based on Monte Carlo test and population penalty function check is designed to reliably solve the problem of optimal disposition. The proposed genetic algorithm is used to simulate and evaluate an optimal disposition of test equipment. Monte Carlo experiments were made for 500 times, a globally optimal solution was obtained by statistically analyzing the experimental results, and the proposed algorithm was compared with the traditional method. The simulated results show that the proposed algorithm can be used to reduce the influence of probability characteristic of genetic algorithm, lock the global optimal solution with large probability events, and ensure the validity and reliability of the optimal solution. Key

A Solider-equipment-task Assignment Model for Combat Engineering Support Operation and Its Solution

ZHANG Chaosheng, WANG Jian, LI Zhengmin, YANG Xin

2019, 40(7):  1511-1517.  doi:10.3969/j.issn.1000-1093.2019.07.022

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A three-dimensional assignment model is established for the assignment of soldiers, equipment and tasks during a combat engineering support operation, in which takes the skill level of soldiers, the technical state of equipment and the cooperative efficiency into account. The constraint conditions of the model are based on the war readiness requirement of multiple skills of soldier and multiple functions of equipment as well as the operational principle of “equipment operating while soldiers taking break”. In view of the objective function and constraint conditions of assignment model, a virtual equipment method is adopted to disintegrate a multi-functional equipment into smaller combinations of single-functional articles. A quick solution algorithm is also designed on the basis of the idea. A detailed introduction is given to the application of the assignment model with illustrative practical instances. The practicabilities of the assignment model and the quick solution algorithm are verified. Key

Comprehensive Review

Research Progress of Large-diameter Split Hopkinson Bar Experimental Technique

GUO Ruiqi， REN Huiqi， ZHANG Lei， LONG Zhilin， WU Xiangyun， XU Xiangyun， LI Zebin， HUANG Kui

2019, 40(7):  1518-1536.  doi:10.3969/j.issn.1000-1093.2019.07.023

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The large-diameter split Hopkinson bar (SHB) technique is an important means for studying the dynamic mechanical properties of concrete and other heterogeneous materials, but the basic assumptions of traditional split Hopkinson pressure bar may not always hold with the increase in SHB diameter, which has brought new challenges to experimental technique, data processing and analysis of experimental results. The brief development history of large-diameter split Hopkinson bar technique is reviewed. Then the wave dispersion effect, stress uniformity in specimen, non-parallel end-faces of specimen, and transverse inertia effect due to the increase in SHB diameter, as well as the corresponding solutions are summarized. The research direction and hotspots of large-diameter SHB experimental technique are discussed. Key

Research Notes

Design and Development of Ergonomic Test Platform of Armored Vehicle Information System

FU Binhe, LIU Weiping, LIU Xixia, SONG Haijun

2019, 40(7):  1537-1545.  doi:10.3969/j.issn.1000-1093.2019.07.024

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An ergonomic test platform of armored vehicle information system is designed and developed to meet the requirement of ergonomic experiment of crew information operation in armored vehicles. The system scheme of test platform is analyzed, including main control system, simulation and test system, and data processing system. Test cabin and console, operation simulator, integrated test device were designed according to the real vehicle situation. Main control, information terminal and fire simulation software were developed. Embedded test method is used to embed the performance test function into the process of operation simulation. The effectiveness and practicality of test platform are demonstrated by a specific example. The results show that the test platform can realize the whole-course test of information operation performance, and the integrated test of cognitive ability, mental workload and physiological parameters. The influences of relative factors on crew information operation performance can be discriminated effectively. Key

Comprehensive Risk Evaluation of Back-ejection Area for Soldier Recoilless Rifle

PANG Chunqiao, TAO Gang, WEN Peng, LI Zhiyu, REN Baoxiang, WANG Xiaofeng

2019, 40(7):  1546-1552.  doi:10.3969/j.issn.1000-1093.2019.07.025

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The shock wave overpressure, heat flux intensity and gas jet impulse during the firing of weapon system were tested to evaluate the risk in the back-ejection area of recoilless rifle. Based on the analysis of the test data and the calculation of the probability model, the personnel trauma probability under the action of different dangerous sources was obtained. The results show that shock wave could cause injury to human eardrum and lung tissue in the dangerous area with a radius of 5 m and a fan angle of 120 degrees. The degree of injury is the most serious in the rear of nozzle. The probability of lung tissue injury is more than 50% in 2 m. The diameter of flame zone is about 2.18 m, and the heat flux in the center of fireball is the strongest. The probability of first-degree burn is 46.95%, but it is not lethal enough. The gas impulse produced by the high-speed gas jet is lethal to the human body, especially when the human head is impacted, the distance of fatal probability greater than 50% is 3 m. Key