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Lan J.,Academy of Military Transportation PLA | Wu Y.,China North System Engineering Institute | Hong Y.,CAS Institute of Mechanics
Advanced Materials Research | Year: 2011

Molecular dynamics simulations have show that nanocrystalline (NC) materials can be treated as composite materials consisting of two phases of grain and grain boundary. In this paper, the incremental stress-strain relation is derived based on deformation mechanism of NC materials and internal variable theory from micromechanics point of view. The developed model is exemplified by the pure copper subjected to uniaxial tension. Implicated iteration algorithm is then employed to obtain the stress-strain relation. Moreover, the effects of grain shape and statistical distribution of grain sizes are also discussed, and predicted results are compared with experimental values to verify the model. © (2011) Trans Tech Publications, Switzerland.


Lan J.,PLA Military Transportation University | Wang M.,PLA Military Transportation University | Wu Y.,China North System Engineering Institute | Yang X.,PLA Military Transportation University
Advanced Materials Research | Year: 2012

The investigation is devoted to simulate the surface roughness, plastic deformation, and residual stress resulting from shot-peening using a single ball against a flat steel plate. A sub-program for random impact was developed to analyze the effects of the repeated impacts on the process. The contact between the shot and the plate was modeled using contact elements with the penalty function type. Moreover, three relative issues were discussed. The first is concerned with the effect of the shot velocity, the second with the shot size, and the third with the friction between the shot and the plate upon the plastic zone development and unloading residual stress. The results reveal that the important role played by the shot size and shot velocity, but to a much lesser extent by the friction. In addition, we obtained that the value of the surface roughness, the effective plastic strain, and the x-stress will be saturated at the fifth impact number, from then on, the results will be changed slightly with the increasing of the impact numbers. © (2012) Trans Tech Publications.


Zhang W.,Academy of Armored force Engineering | Li W.-W.,China North System Engineering Institute | Ren Z.-H.,Chongqing Communication College | Li Z.-L.,China North System Engineering Institute
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2010

Path planning based on GIS is a fundamental problem in many applications. It is the main problem affecting the planning time because of the multi-obstacles in field environment. A novel rectangle windowing query method was proposed in order to improve the compute efficiency of collision free test. The method reduces the numbers of obstacles needed to test and speeds the planning process, and is more suitable with the dynamic environment of obstacles changing than the interval tree method.


Li F.-G.,Beijing Institute of Technology | Xia Q.-L.,Beijing Institute of Technology | Cui X.-X.,China North System Engineering Institute | Qi Z.-K.,Beijing Institute of Technology
Yuhang Xuebao/Journal of Astronautics | Year: 2013

To choose a reasonable line of sight rate extraction scheme of seeker in missile general design, a useful method is present based on analysis of characteristics of seeker disturbance rejection rate parasitic loop. A model of parasitic loop were established for a typical gimbaled seeker. Then using frequency domain methods the characteristic difference of disturbance rejection rate transfer function and parasitic loop as well as guidance system are analyzed for two kinds of extraction scheme. The effect of guidance parameters on the parasitic loop stability region is studied with Routh criteria. Using an infrared image seeker's parameters, simulation is done under typical flight condition to confirm the theoretical analysis. The study shows that the parasitic loop can change characteristics of guidance system, and line of sight rate extraction schemes also have essential effect on stability and stable performance of guidance system due to parasitic loop. To identify characteristics of seeker disturbance rejection rate is useful for determining line of sight rate extraction scheme.


Fu B.-B.,Science Research Institute of China North Industries Group Corporation | Lei J.-M.,Beijing Institute of Technology | Wang D.-M.,China North System Engineering Institute
Binggong Xuebao/Acta Armamentarii | Year: 2010

On the base of theoretic analysis of gliding extended range, a mathematic model for exterior ballistics of gliding extended range guided munitions (ERGM) was established, and the maximum lift-to-drag ratio trajectory was simulated to obtain the ideal trajectory and actual trajectory. The simulation results were analyzed, and the improvement measures for the controlling system and the canard rudder surface shape were put forward to solve the oscillation problems of attack and attitude angles, thus assure the ERGM's stabilization of gliding flight.


Tang R.,Science Research Institute of China North Industries Group Corporation | Liu C.-Y.,China North System Engineering Institute | Zhang J.,Science Research Institute of China North Industries Group Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

It expounds the relationship between precise attack firepower system and future battlefield reinforcement support system and analyzes some key factors which can affect the firepower system. By analyzing their close relationship, it can be concluded that the development of precise attack firepower system should be focused on, and the coordinate development of multiple systems should also be paid attention to, in order to maximize the combat and operation effectiveness.


Ge W.,China North System Engineering Institute | Cao D.-J.,China North System Engineering Institute | Hao H.-X.,China North System Engineering Institute
Binggong Xuebao/Acta Armamentarii | Year: 2010

By using IR detector to capture and track the target's infrared radiation energy, IR guidance technology features high precision, anti-wireless jam and operation in both day and night. In this paper, the development history of IR imaging guidance is introduced, and its pivotal technologies are analyzed. It can be seen that the IR detector trends to miniature, high resolution and sensitivity. With the development of matching and fusing techniques for IR and visible images, current issues focus on selection of work-band, pneumatic-optical effects and evaluation of fusing results.


Han L.,China North System Engineering Institute | Pang Y.-K.,China North System Engineering Institute | Cao Y.,China Aerospace Science and Technology Corporation | Zhang M.-Q.,China North System Engineering Institute
Binggong Xuebao/Acta Armamentarii | Year: 2010

The precise attack technology plays a more and more important role in information-based warfare. In this paper, its current development status and existing problems are introduced in detail, and its remarkable features presented in information-based warfare are discussed also. This paper mainly focuses on the development tendency of precise attack, which will trends to long range, stealth, information and network, microminiaturization, intelligent, high precision, multi-purpose, low cost etc.. Considering the technical foundation in China, the development emphases are proposed finally.


Zhang M.-Q.,China North System Engineering Institute | Liu D.-F.,Beijing Simulation Center | Wang D.-M.,China North System Engineering Institute | Pang Y.-K.,China North System Engineering Institute
Binggong Xuebao/Acta Armamentarii | Year: 2010

As a new type of precise attacking weapon, the trajectory correction projectiles find favour in more and more eyes for their low price and attacking precision. Their concept, development and trend were introduced in this paper. Based on the analyses for their critical technologies and domestic development, we can draw a conclusion that the development of one-dimensional semiautomatic trajectory correction projectiles is feasible, meanwhile, the technology research on the active trajectory correction projectile, as their development mainstream, will be strengthened.


Wang D.-M.,China North System Engineering Institute | Dai W.-R.,China North System Engineering Institute | Zhang Y.-T.,China Aerospace Science and Technology Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

With the development of modern warfare towards information, the information ammunition is a consequential development trend for the precise and guided ordnance equipment. This paper aims at introducing its connotation and category, analyzing the objective necessity of its development, briefing the prevailing information ammunition of the foreign land forces as well as its traits, and finally analyzing its development trends, based on the requirement of information warfare.

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