Table of Content

28 February 2017, Volume 38 Issue 2

Previous Issue    Next Issue

Contents

Contents

2017, 38(2):  0. 

Asbtract ( )   PDF (928KB) ( )  

References | Related Articles | Metrics

Paper

Study of Rigid Ejection Reliability Analysis and Design Method of Automatic Rifle

ZOU Yan, XU Cheng, LUO Shao-min, YANG Yang

2017, 38(2):  209-217.  doi:10.3969/j.issn.1000-1093.2017.02.001

Asbtract ( )   PDF (4208KB) ( )  

References | Related Articles | Metrics

The action reliability is an important factor which must be considered in the design of mechanisms, and is a key index to evaluate the quality of a system. The main parameters influencing ejection action reliability are determined, and a rigid ejection reliability analysis and design process of automatic rifles is set up. A simplified virtual prototype model of rigid ejection action reliability is established. The simulated results show that the position of ejector, the backplate position of ejection port and the ejection velocity are the dominant factors which have effect on ejection action reliability; as the ejection velocity is high enough, gravity has less effect on ejection action reliability. A method to determine the position of ejector is presented, and the calculational equations are established for location dimension of ejection port. An adjustable backplate of ejection port mechanism is designed to test in the shooting experiment. The experimental results are consistent with the simulated results. It shows that the validity and suitability of the proposed method are verified.Key

Research on the Effect of Diesel Injector Nozzle Deposit on Spray Characteristics

WANG Xian-cheng， ZHAO Wen-zhu， HE Mu， YANG Shao-qing， XU Dong-dong

2017, 38(2):  218-226.  doi:10.3969/j.issn.1000-1093.2017.02.002

Asbtract ( )   PDF (8589KB) ( )  

References | Related Articles | Metrics

The cold spray characteristics experiment of diesel injector is carried out in a constant volume bomb. The spray penetration distances and cone angles of carbon-deposited injector and new injector in the condition of different injections are analyzed. The results show that the spray penetration distance and cone angle of carbon-deposited injector decrease compared to those of new injector. The value gap is great at the initial stage of injection and is reduced at the late stage of injection. If the injection pressure is increased, spray penetration distance and cone angle would be decreased. The optical micrograph reveals that nozzle external deposit distributes along the orifice, and the original structure is changed. VOF (volume of fluid) is used to numerically calculate the internal flow, and the effects of internal and external deposits and increase in nozzle length on internal flow are analyzed. The results show that the internal and external deposits and increase in nozzle length could result in weakening the cavitation effect, reducing the mass flow rate, velocity and turbulent kinetic energy, and deteriorating the atomization quality. Compared with internal deposit and increase in nozzle length, the external deposit has more impact on internal flow. Key

An Investigation on Starting Process Experiment of Diesel Engine in Altitude Environment

MA Ning, LI Ruo-ting, ZHAO Wen-zhu, YANG Shao-qing, XU Dong-dong, SUN Zhi-xin

2017, 38(2):  227-232.  doi:10.3969/j.issn.1000-1093.2017.02.003

Asbtract ( )   PDF (4213KB) ( )  

References | Related Articles | Metrics

The starting performance of diesel engine is one of the main performance indexes. The altitude environment has an important influence on the starting process of diesel engine. A diesel engine with 12 cylinders was test to research the influence of altitude environment on diesel engine starting process in altitude environment and plain environment, and the cylinder pressure, top dead center, and instantaneous rotational speed were measured. The experimental results indicate that the starting time is longer, the fluctuation of rotational speed is greater, and the proportion of bimodal combustion is larger during starting in altitude environment. The combustion analysis of starting process indicates that the starting process in altitude environment has a longer combustion delay period calculated with crank degree, and the combustion in cylinder in altitude environment appears more delay than that in plain environment. The starting process in altitude environment has a longer combustion delay period calculated with time than that in plain environment at the same rotational speed. Key

Predictive Operation Time Model for Information Processing Task of Crew in Armored Vehicle

NIE Jun-feng， LIU Wei-ping， FU Bin-he， ZHANG Zheng， YANG Bo

2017, 38(2):  233-239.  doi:10.3969/j.issn.1000-1093.2017.02.004

Asbtract ( )   PDF (1152KB) ( )  

References | Related Articles | Metrics

The accurate prediction of operation time is essential to study the operating state of crew in armored vehicle, and is important to improve the operational effectiveness of the man-machine system. In view of a basic trend that the operation type gradually changes into information processing，the information input task is studied，and the operate-units and cognitive process are systematically analyzed. A predictive operation time model is built based on crew’s control and cognitive characteristics. The predictive operation time model is verified through experiment, with an aim to solve the prediction problem of crew’s information processing time under the condition of emergency. The test results show that the proposed model could describe the whole cognitive process of crew’s information input task and predict the reaction times of operate-units accurately. The model has high prediction accuracy and reusability.Key

The Measuring Method for Geometric Parameter of Bore Jamming Based on Displacement Sensor Array

PENG Peng， DI Chang-an， WANG Zhe-jun

2017, 38(2):  240-245.  doi:10.3969/j.issn.1000-1093.2017.02.005

Asbtract ( )   PDF (3590KB) ( )  

References | Related Articles | Metrics

The loading precision of projectiles and the consistency of bore jamming of large caliber barrel have a great impact on the bore wear and firing accuracy. Based on the bore jamming status of large caliber projectile, a nondestructive measuring method is presented for measuring the geometric parameters of projectile muzzle in firing field. The measurement principle and system composition of the measuring method are introduced. The measurement models of the axis of chamber, the axis of projectile and the tail end of projectile are established, and the performance of each measurement module is analyzed and verified. On this basis, the geometric parameters of projectile are measured by the proposed measuring system. The stability and accuracy of the measuring system are verified through the analysis of the experimental results. Key

Sliding-mode-observer-based Robust Variable Structure Control for Integrated Autopilot-guidance

YANG Jing， WANG Xu-gang， WANG Zhong-yuan， CHANG Si-jiang

2017, 38(2):  246-253.  doi:10.3969/j.issn.1000-1093.2017.02.006

Asbtract ( )   PDF (2729KB) ( )  

References | Related Articles | Metrics

A novel sliding-mode-observer-based variable structure controller is proposed and proved by Lyapunov’s theorem for integrated guidance and control(IGC) synthesis for extended range guided projectiles (ERGP) in order to realize hit-to-kill interception with limited measurement. Accounting for the short-period dynamics of the ERGPs and first-order lag of the canard servo, the two-loop IGC model is formulated in the presence of the discrepancies from aerodynamic parameters and target maneuver. The outer-loop of the IGC generates the commanded pitch rate to regulate the line-of-sight (LOS) rate to zero in finite time; the inner-loop is designed to track the outer-loop command. Simulation results show the effectiveness of the proposed controller and that the acceleration requirement is reduced. Key

Recognition of Target and Jamming Signal for FM Fuze Based on Entropy Features

HUANG Ying， HAO Xin-hong， KONG Zhi-jie， ZHANG Biao

2017, 38(2):  254-260.  doi:10.3969/j.issn.1000-1093.2017.02.007

Asbtract ( )   PDF (5789KB) ( )  

References | Related Articles | Metrics

A classification and recognition method of target and jamming signal based on entropy features is proposed to restrain the AM frequency-sweeping jamming of FM fuze. The time domain and frequency domain characteristics of output signal of fuze detector under the action of target and jamming signal are compared, the Shannon entropy and singular spectrum entropy of fuze detection output signal are extracted and verified to be valid by Kruskal-Wallis test method, and the support vector machine is used for classification and recognition of target signal and jamming signals. The experimental results show that the correct recognition rate of the proposed method is 98.954%, and it can effectively improve the ability of the anti-frequency sweeping jamming of FM fuze. Key

Research on Exploding Foil Initiator Based on Non-silicon MEMS Technology

LI Ke-wei， CHU En-yi， XUE Yan， XIE Rui-zhen， REN Xiao-ming， REN Xi， LIU Lan， LIU Wei

2017, 38(2):  261-266.  doi:10.3969/j.issn.1000-1093.2017.02.008

Asbtract ( )   PDF (5749KB) ( )  

References | Related Articles | Metrics

The non-silicon MEMS manufacturing technology of exploding foil initiator (EFI) is studied to realize the integration and large-scale manufacture of EFI. The integrated bridge foils are fabricated by magnetron sputtering and lithography technology. The PMMA photoresist flyer layer is fabricated on the bridge foil by UV thick photoresist lithography process. SU-8 photoresist is used to fabricate the acceleration chamber. 268 EFI chips are prepared on a wafer substrate with 0.018 cm³ for each chip. 50% ignition sensitivity of the integrated EFI is 2 185 V. The high temperature resistance of EFI chip is tested at 160 ℃ for 50 h. The results show that the EFI chips could reliably detonate HNS-Ⅳ. Key

Spin-coating Preparation of Micro-and Nano-thermite Films and Their Combustion Performances

LI Han-jian, LIU Jie, REN Hui, JIAO Qing-jie

2017, 38(2):  267-272.  doi:10.3969/j.issn.1000-1093.2017.02.009

Asbtract ( )   PDF (5589KB) ( )  

References | Related Articles | Metrics

The micro-and nano-thermite films are prepared using spin-coating with fluorine rubber as a binder. Ensuring the integrity of films, the mass content of fluorine rubber is minimized by controlling the spin-coating process. The minimum mass content of fluorine rubber is observed to be 7% through scanning electron microscope. The thermophysical properties of thermite films are tested using heat flux method. The measured thermal conductivity of Al/MoO₃/FE film is 75 W/(m·K) , and the burning rate is 30.6 m/s. Surprisingly, the thermal conductivity reaches to 126 W/(m·K), and the burning rate is increased to 867.9 m/s after appending reduced graphene oxide. The ignition test results of metal bridge show that micro-and nano-thermite films could improve the combustion performance of thermite and the ignition performance. Key

Research on Noise Characteristics of Pulsejet Engine

KANG Yang, WENG Chun-sheng， LI Ning

2017, 38(2):  273-279.  doi:10.3969/j.issn.1000-1093.2017.02.010

Asbtract ( )   PDF (1779KB) ( )  

References | Related Articles | Metrics

The noise characteristics of a Helmholtz-type pulsejet engine are experimentally studied. In the experiment, the length of tailpipe is changed from 680 mm to 1 280 mm at every 200 mm interval. The noise of pulsejet engine is measured at different distances and different angles from the exit of tailpipe. The experimental results show that the noise of pulsejet engine has the characteristics of periodicity and low frequency. The noise fundamental frequency of pulsejet engine is determined by its working frequency. The fundamental frequency component of noise is the largest proportion of the total noise. As the propagation distance of noise increases, the sound pressure level decreases. The attenuation amplitude of noise is slightly larger than that of the spherical wave. The noise attenuation laws of noise at different angles are almost identical. The directivities of noise at different propagation distances are same. The highest noise pressure appears in the direction of 0°. With the increase in length of tailpipe, the sound pressure level and the fundamental frequency decrease. However, the directivity of noise isn’t changed. Key

Research on Grain Burning Surface Regression Based on Level-set Method and Minimum Distance Function

WANG Ge, HAN Wan-zhi, LI Dong-dong, GAO Ye

2017, 38(2):  280-291.  doi:10.3969/j.issn.1000-1093.2017.02.011

Asbtract ( )   PDF (6476KB) ( )  

References | Related Articles | Metrics

The combustion surface regression is studied using Level-set method and minimum distance function (MDF) in SRM. A way that accurately predicts burning surface regression of solid propellant is established based on Level-set method and MDF. The grains with different geometries, the propellant grains with different burning rates and the grains with erosion combustion are calculated and analyzed. The results show that the combined method which calculates the burning area based on interface segmentation and geometric reconstruction has a good adaptability and high reliability on combustion surface regression. Key

Research on the SynthesisCharacterization and Pulse Ultrasnic-assisted Extraction of a Low Melting Point Energetic Compound

LUO Jin， LIU Yu-cun， LIU Yan， WANG Jian-hua， CHAI Tao， YUAN Jun-ming， YU Yan-wu，CHANG Shuang-jun

2017, 38(2):  292-297.  doi:10.3969/j.issn.1000-1093.2017.02.012

Asbtract ( )   PDF (1118KB) ( )  

References | Related Articles | Metrics

1-Methyl-3,5-dinitro-1,2,4-triazole (DNMT) is synthesized from dicyandiamide and methyl hydrazine via a two step procedure (condensation and oxidation). After purification, the melting point is 93~95 ℃. The structure of the target DNMT is characterized by ¹H, ¹³C NMR, FT-IR, MS and elemental analysis. The thermal stability is studied by TG-DTA. The result shows that the thermal decomposition temperature is 281.5 ℃. The reaction mechanism of DNMT in synthesis is primarily discussed. The post- treatment technology is improved, and the method of ultrasonic-assisted liquid-liquid extraction (ULLE) is used to extract the target product with thermal ethyl acetate as extractant. The influence of extraction parameters, such as volume, temperature of extraction solvent, extraction time, etc., on extraction efficiency are investigated. The result shows that ULLE method is conducive to efficiently obtain highly pure product (≥98.68%, HPLC), and the overall yield is raised to 52.8%. Key

Numerical Simulation on Underwater Explosion of Aluminized Explosives and Its Damage to Ship

ZHAO Qian， NIE Jian-xin， WANG Qiu-shi， DUAN Xiao-yu

2017, 38(2):  298-304.  doi:10.3969/j.issn.1000-1093.2017.02.013

Asbtract ( )   PDF (4322KB) ( )  

References | Related Articles | Metrics

The damage effect of aluminized explosives on the ship targets is an important evidence of checking whether the explosive formula is reasonable. In order to study the influence of the molar mass of aluminum and oxygen (Al/O ratio) on ship damage, the damage effect of aluminized RDX-based explosive (RDX/Al) on ship is researched by means of numerical simulation. The damage effect is explained from four aspects: displacement, acceleration, stress and strain. Simulated results show that the overall and the local damage effects of a ship increases and then decreases with the increase in Al/O ratio in the near field. The damage effect of explosive on ship is optimal when Al/O ratio is 0.36. It can be seen from the relationship between Al/O ratio and energy release rate that the main reason of ship damage is the shock wave energy in the near field. Key

Research on Priority Polling Access Control Protocol in FPGA-based Tactical Data Link

LIU Long-jun， DING Hong-wei， LIU Qian-lin， BAO Li-yong， LIU Zheng-gang

2017, 38(2):  305-312.  doi:10.3969/j.issn.1000-1093.2017.02.014

Asbtract ( )   PDF (5675KB) ( )  

References | Related Articles | Metrics

Considering the background of the application of tactical data link in modern information war, a priority polling access control protocol (PPACP) is proposed for that the traditional polling protocol has single function and can not achieve the priority transmission control in actual application. The proposed protocol can set the top priority site as the network control station and the rest of the sites as slave stations based on the priority level of sites. The simulated results show that PPACP can improve the traditional polling protocol, which is better adapted to the requirements of the priority transmission of the most urgent operational message in the tactical data link. PPACP is designed based on field programmable gate array ( FPGA), and the correctness of the design is verified by the simulation test. Key

Experimental Study of Bubble Drag Reduction with Micro-hole Array on an Axisymmetric Model

HUANG Lei, PENG Xue-ming, WANG Sheng-jie, HE Chun-tao, DUAN Lei

2017, 38(2):  313-318.  doi:10.3969/j.issn.1000-1093.2017.02.015

Asbtract ( )   PDF (4115KB) ( )  

References | Related Articles | Metrics

To explore the bubble drag reduction of axisymmetric model and understand the characteristics of two-phase flows, the bubble drag reduction with micro-hole array on an axisymmetric model is experimented by using a high speed camera system and a force-measuring system. The experimental results show that the two-phase flow field can be divided into three regions, i.e., stable region, pulsating region and recirculation region, according to the different flow patterns of bubbles in the process of their development. With the increase in ventilation rate, the void fractions in the stable region and the pulsating region increase, and the friction resistance of the model decreases continuously until a saturated ventilation rate is achieved. The flow separation point of recirculation region moves downstream and the tail pressure increases as air entrainment coefficient increases. The flow pattern of the recirculation zone changes at the critical ventilation rate, and the flowing medium is changed from water- gas mixture into gas, which results in a sudden increase in the tail pressure, thereby leading to the sudden increase in the bubble drag reduction. Key

On the Porpogation Mechanism of Ship Seismic Wave and Its Application in Mine Fuze

MENG Lu-wen， CHENG Guang-li， CHEN Ya-nan， ZHANG Ming-min

2017, 38(2):  319-325.  doi:10.3969/j.issn.1000-1093.2017.02.016

Asbtract ( )   PDF (2477KB) ( )  

References | Related Articles | Metrics

To provide a theoretical guidance for the application of ship seismic wave in mine fuze, the excitation mechanism and motion law of ship seismic wave in the semi-infinite two-layered ocean environment are theoretically deduced based on wave theory, and then the propagation characteristics of ship seismic wave are also studied. The analysis results show that the ship seismic wave is composed of Scholte wave and normal mode wave, in which low frequency cutoff and frequency dispersion phenomena exist. When frequency increases to a certain value, the frequency dispersion phenomenon disappears, and the motion trajectory of the particle is elliptical. The particle amplitude of Scholte wave decays rapidly away from the seabed and its energy is mainly concentrated in the depth of one wavelength, but its lateral attenuation is small. A staggered grid finite difference method is applied to the numerical simulation of ship seismic wave, and the wave field snapshots and time-domain waveforms are given. The lake trial is carried out, the time-frequency distribution characteristics of lakebed seismic wave signal are presented, and the feasibility of using ship seismic wave as a new physical field of mine fuze is also analyzed. Key

A Multi-AUV Formation Algorithm Combining Artificial Potential Field and Virtual Structure

PAN Wu-wei， JIANG Da-peng， PANG Yong-jie， LI Yue-ming， ZHANG Qiang

2017, 38(2):  326-334.  doi:10.3969/j.issn.1000-1093.2017.02.017

Asbtract ( )   PDF (6485KB) ( )  

References | Related Articles | Metrics

Collision avoidance in the forming process of formation and obstacle avoidance on the formation proceeding are not solved using traditional multi-AUV formation algorithms, such as leader-follower and virtual structure. Artificial potential field algorithm can be used to solve the above problems, while its ability of formation organization is not satisfied. A multi-AUV formation control algorithm combing artificial potential field and virtual structure is proposed to overcome the problems. The system is divided into three parts: formation reference point, virtual structure particle and AUV. The desired virtual structure, which is the moving target of virtual structure particles, is organized to surround the formation reference point. Repulsive artificial potential is used to avoid collision and obstacle while the particles move. The AUVs track the particles to form a certain formation asymptotically. The formation path following, formation changing and obstacle avoidance are simulated to verify the availability and flexibility of the proposed algorithm. The results indicate that the multi-AUV system can form a formation without collision from random initial positions, and the fleet can change formation flexibly and avoid obstacles effectively while proceeding. Key

Research on Control and Decision-making of Submarine and Intelligent UUV Cooperative System

WANG Sheng-jie， KANG Feng-ju， HAN Hong

2017, 38(2):  335-344.  doi:10.3969/j.issn.1000-1093.2017.02.018

Asbtract ( )   PDF (2760KB) ( )  

References | Related Articles | Metrics

The unmanned battle is a development tendency of the future war, but the intelligent level of unmanned underwater vehicle (UUV) is limited, thus leading to the limitation in the application of UUV formation in the underwater network centric warfare. For the above-mentioned issue, human intelligent is introduced into the intelligent UUV formation to form a cooperative-combat system combining submarine and intelligent UUV, and the advantages and complexity of the system are analyzed. The key technologies of organization structure and decision-making of the system are researched. And finally, the system is simulated to test and verify its effectiveness. The simulation of path planning in the presence of emerging threat is carried out, and the result indicates that the submarine and intelligent UUVs cooperative system is able to realize obstacle avoidance and threat avoidance effectively,and the system's emergency response capability is improved. Key

Preparation and Performance Research of Super Absorbent and Temperature Control Green Camouflage Fabric

JIANG Xiao-jun， WANG Hua-lin， LING Jun， YIN De-fei

2017, 38(2):  345-350.  doi:10.3969/j.issn.1000-1093.2017.02.019

Asbtract ( )   PDF (3046KB) ( )  

References | Related Articles | Metrics

For the purpose of surface radiation temperature control and simulation of green vegetation optical reflection characteristics, the structure characteristics of plant leaves and two technological approaches, such as in-situ polymerization by super absorbent resin and green camouflage water-based color paste by computer color matching, are used to develop a super absorbent temperature control green camouflage fabric, and manufacture a super-absorbent camouflage net. The fabric has the same spectral reflection characteristics as the green plants have in 380~1 800 nm, and can simulate the moisture absorption characteristic peak of green plants. The infrared radiation temperature of the super absorbent sample camouflage nets can be kept to be consistent with the that of vegetation within 24 hours through slow transpiration cooling of water, and the thermal infrared images are fused better with vegetation. The water absorption and keeping of the material can be adjusted and controlled. Thus, the degree of material engineering application should be improved. Key

The Effect Evaluation of Infrared Camouflage Simulation System Based on Visual Similarity

FANG Hao, LI Ai-hua, PAN Yu-long, WANG Xue-jin, JIANG Ke, WANG Hua

2017, 38(2):  351-357.  doi:10.3969/j.issn.1000-1093.2017.02.020

Asbtract ( )   PDF (1133KB) ( )  

References | Related Articles | Metrics

An evaluation method based on visual similarity is presented to solve the difficulty in the effect evaluation of infrared camouflage simulation system. From the perspective of visual similarity, a new visual similarity model is proposed, and the evaluation index system, including temperature deviation coefficient, discrete deviation coefficient and visual similarity coefficient, is established. A multi-attribute decision making (MADM) model based on intuitionistic fuzzy sets for evaluation is built to reduce the influence of subjective experience. The technique for order preference by similarity to an ideal solution (TOPSIS) is used to solve the model. For the same distance to idea/anti-idea alternative, the grey approach coefficient based on intuitionistic fuzzy sets and the Hamming distance is used to describe the similarity between the alternatives, solving the MADM problem effectively. The application example shows that the evaluated results of the proposed model are consistent with the evaluated results of TOPSIS method and experts, thus verifying the reasonability of evaluation index system and the feasibility of the proposed method. Key

Research on Work-hardening Behavior of Surface Layer of Spline during Cold Roll-beating

CUI Feng-kui, LING Yuan-fei, XUE Jin-xue, LI Yu-xi, LI Yan, XIE Ke-ge

2017, 38(2):  358-366.  doi:10.3969/j.issn.1000-1093.2017.02.021

Asbtract ( )   PDF (11118KB) ( )  

References | Related Articles | Metrics

The work-hardening mechanism of surface layer of spline is analyzed based on the principle of cold-roll beating formation. The cold roll-beating formation is simulated, and the scanning electron microscopic and transmission electron microscopic examination and micro hardness test of spline test piece are conducted. The equivalent strain and temperature distribution during the forming process of cold roll-beating are obtained. The variations of grain, dislocation and hardness values at different positions of spline tooth along the direction of hardened layer depth are discussed, the relationships among grain size, dislocation density and hardness along the direction of layer depth are clarified, and the effect of cold roll-beating parameters on the degree of work hardening is revealed. The results show that work-hardening on surface layer of workpiece during high speed cold roll-beating is mainly affected by dislocation density. The hardening degree of pitch circle is maximal, the hardening degree of different positions of tooth profile increases with the increase in the feed rate of workpiece, but decreases with the increase in the rotational speed of roller. The research results provide a basis for revealing the work-hardening behavior of surface layer of spline of 1020 steel during cold roll-beating. Key

Analysis and Correction of Installation Errors of Laser Parallel Detector Array Barrage Measuring System

XU Da, HE Kai-ping, LUO Jian-hua, LI Hua

2017, 38(2):  367-373.  doi:10.3969/j.issn.1000-1093.2017.02.022

Asbtract ( )   PDF (4476KB) ( )  

References | Related Articles | Metrics

A line laser parallel detector array barrage weapon dispersion measuring method is presented for structure installation errors.The influences of installation errors on measurement are researched, and an error transfer formula is given. The measuring error distribution of structural installation errors is analyzed quantitatively. When a target area is 10 m×10 m, the installing distance error σ of detector array and line laser is 5 cm, and the target leans 2° to the right and 2° backwards. The results show that the maximum error of x coordinate is -10.87 cm, the maximum error of y coordinate is 2.13 cm. Measurement experiment of the coordinate is carried out in the case of installation error according to the distribution of measurement errors, and the coordinate measurement errors are corrected according to the experimental data. Key

Research on Cooperating Support Model of Equipment Support System of Systems Based on Complex Network

XING Biao, CAO Jun-hai, SONG Tai-liang, CHEN Shou-hua, DONG Yuan-sheng

2017, 38(2):  374-382.  doi:10.3969/j.issn.1000-1093.2017.02.023

Asbtract ( )   PDF (4825KB) ( )  

References | Related Articles | Metrics

The cascading failure can lead to a strong damage to the stability of network when it happens. A cascading failure model for equipment support system of systems is established based on the analysis of the support network structure and the actual support condition. And then a cooperating support model is established to reduce the influence of cascading failure and improve the stability of support network. A simulation case analysis for the corps equipment support system of systems cooperating support model is simulated and analyzed under the incomplete information attack. The simulated results show that the cooperating support model is feasible and applicable. Key

Simulation of Dynamic Characteristics of Armature in Magnetic Flux Compression Generator

LU Feng， CHEN Lang， FENG Chang-gen， WANG Li-hua

2017, 38(2):  383-388.  doi:10.3969/j.issn.1000-1093.2017.02.024

Asbtract ( )   PDF (5494KB) ( )  

References | Related Articles | Metrics

In order to improve the performance of magnetic flux compression generator, a cylinder-conical generator is designed, and the dynamic response characteristic of armature in the generator is studied. The clustering algorithm and text mining technology are used to develop secondarily LS-DYNA software. The code which makes the node failure and separates the finite element mesh is compiled, and a simulation model is established to simulate dynamic expansion and fracture process of generator. Expansion angle, radial expansion velocity and fracture radius of armature are presented. The calculated results show that the proposed model can be used to predict the expansion and fracture process of armature, and the simulated expansion angle, radial expansion velocity and fracture radius of armature are close to the theoretical values. The method can be used for the design of the magnetic flux compression generator, optimizing the structure of generator and improving its output performance.Key

Research on Non-blasting Flexible Cylinder Launcher

LIU Zhong-bin， XIAO Shou-ne， WANG Huan

2017, 38(2):  389-395.  doi:10.3969/j.issn.1000-1093.2017.02.025

Asbtract ( )   PDF (3587KB) ( )  

References | Related Articles | Metrics

A flexible cylinder launcher based on compressed gas mute launch was developed in order to realize to do work in changing distance to ejection object in the case of constraint and non-blasting. The dynamic characteristics of flexible cylinder launcher is studied through the analysis of catapult theory, simulation calculation and experimental verification. Results indicate that the flexible cylinder launcher can catapult the projectiles when it is folded, compressed, inflated and unfolded, and no blasting phenomenon exists during catapulting. The catapult ability of launcher is affected by the initial length of the flexible cylinder, the contact area of flexible cylinder and projectile, the pressure in flexible cylinder and other factors. The catapult ability of flexible cylinder with different initial lengths is researched. It is found that the longer the initial length is, and the more the fold number of flexible cylinder is, the longer the its catapult distance is, and the stronger its catapult ability is. Under the action of the pressure 2 MPa, a 1 000 mm×2 000 mm four flexible cylinder group which catapults a 60 t projectile can produce 4.6 MJ energy. It reflects that flexible cylinder launcher can realize to catapult large mass object. Key

Research Notes

Research on Integrated Power System and Its Key Techniques of Ground Combat Platform

MA Xiao-jun, YUAN Dong, XIANG Yu, WEI Shu-guang

2017, 38(2):  396-406.  doi:10.3969/j.issn.1000-1093.2017.02.026

Asbtract ( )   PDF (6076KB) ( )  

References | Related Articles | Metrics

A theory framework for integrated power system of ground combat platform is proposed according to the electric energy requirements of mission systems in ground combat platform, such as electric drive system, electric weapon system, electric protection system, and so on. The system definition, function and characteristics are discussed, and then a distributed system structure based on energy sources with multi-driving characteristics is built. On this basis, the matching calculation of energy sources, the design of power converters, the strategy of energy distribution and optimization control, as well as the management of electric energy quality are analyzed thoroughly. A prototype is developed and applied in engineering practices, establishing both the theoretical evidence and energy support for the quickening development of all-electric technology of ground combat platform. Key

Experimental Study of Shock Wave in the Simulated Armored Cabin under the Action of Shaped Charge Jet

KE Wen， CHEN Hua-liang， ZHANG Zhi-wei， MA Lin, MEN Li-juan ， WANG Feng-dan

2017, 38(2):  407-411.  doi:10.3969/j.issn.1000-1093.2017.02.027

Asbtract ( )   PDF (5213KB) ( )  

References | Related Articles | Metrics

A simulated equivalent target of passenger compartment of the typical armored personnel carrier is built to investigate the damage effect of shock wave on the advanced armor target. The tests of shock wave in closed cabin were carried out in the conditions of SC static penetration and the static explosion of detonator in cabin. The results indicate that the shaped charge jet can produce a certain damage effect when penetrating the armored cabin; and the test waveforms differ greatly due to cabin vibration, test position, wall reflection and installation methods of sensors when the bulkhead is penetrated by shaped charge jet. Compared with the static explosion of bare charge in cabin, the shock waves produced by shaped charge explosion and jet penetration are more complex, therefore the effective waveform is beneficial to obtain by using the test method of removing the simulated cabin bottom. Key

Static Characteristics of Copper Cylinders for Chamber Pressure Measurement

WANG Fang, GUO Zeng-gui, ZHU Ming-wu

2017, 38(2):  412-416.  doi:10.3969/j.issn.1000-1093.2017.02.028

Asbtract ( )   PDF (1610KB) ( )  

References | Related Articles | Metrics

Copper cylinders as a sensing element of crusher gauges are widely used for measuring the peak pressure in weapon chamber. In order to improve the measuring accuracy, a new mathematic model is proposed to investigate the static deformation of copper cylinders. The model parameters are estimated based on calibrated data.The calculated results are in good agreement with the experimental results. This model can be well applied to estimate the static deformation law of copper cylinders, and has wide applicability to different specifications of copper cylinders. According to the mathematical model, the variation of copper cylinder pressure sensitivity with deformation and the influence of machining dimension deviation on the accuracy of pressure measuring are calculated. When the height of copper cylinder after compression is 73% of its original one, the pressure sensitivity of the copper cylinder is the highest. The geometric dimension tolerances of copper cylinder and piston are the main factors which affect the pressure measurement uncertainty. The pressure measuring precision of copper cylinders can be improved by improving the machining precision obviously. Key