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Huludao, China

Liu F.-M.,Harbin Engineering University | Qian D.,Harbin Engineering University | Liu C.-H.,Harbin Engineering University | Liu C.-H.,Naval Flying Academy
Kongzhi yu Juece/Control and Decision | Year: 2012

In this paper, an artificial physics optimized particle filter(APO-PF) is proposed. Artificial physics optimization (APO) is incorpoarted into resampling process to deal with the sample degeneration and impoverishment of generic particle filter(PF). Virtual force model of the APO specifies that particles have mutually attractive and repulsive force. Through optimization, the APO can distribute particles in high likelihood area, and the sample degeneration is reduced. Synchronously, the APO makes particles contain each other in the motion process, ulteriorly formats better coverage to posterior probability density, which improves estimation performance, particle overlap is avoided and diversity of particle is also maintained. The simulations are performed to show the effectiveness of the algorithm, and the results show that the estimation performance and robustness of the proposed algorithm are superior to that of the generic PF.

Sun G.,Changchun University | Qi X.,Changchun University | Zhang Y.,Naval Flying Academy
Proceedings of the 2011 Chinese Control and Decision Conference, CCDC 2011 | Year: 2011

Rough set theory is mainly used for analyzing, processing fuzzy and uncertain information and knowledge, and mainly used for the aspect of fault diagnosis, but the theory is basically implemented by software. The article makes use of the advantages of hardware, put forward A FPGA-based implementation of Rough Set Theory, the method effectively improves the speed of data process, reduction and rule extraction, in addition, the method has a strongly engineering practically, and provide a new method for technology research of fault diagnosis based on hardware. © 2011 IEEE.

Wu M.,Naval Flying Academy
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

Based on the known probable moving course of submarine targets, and the actual searching process of anti-submarine airplane, to search the target in the finite domain, the wind factor to affect searching process was analyzed. The arc-spiral searching model of dipping sonar and submarine moving models were built. In the factor of given ocean environments, the experimental results simulated and analyzed the arc-spiral searching course of dipping sonar. The experimentation compared and analyzed the influence of searching probabilities on curve searching, sector searching, and arc-spiral searching manners. The experimental results indicate that the searching probability of arc-spiral searching manner of dipping sonar is better than curve and sector searching manners. © 2015, The Editorial Board of Journal of System Simulation. All right reserved.

Yang M.,Yantai Naval Aeronautical and Astronautical University | Bi Y.,Yantai Naval Aeronautical and Astronautical University | Chen Y.,Yantai Naval Aeronautical and Astronautical University | Xu L.,Naval Flying Academy
Proceedings of 2011 IEEE International Conference on Intelligence and Security Informatics, ISI 2011 | Year: 2011

To study the influence factors of aluminum alloy Fretting fatigue life, the global finite element model is employed. The effectiveness of the model is validated according to the comparison of analytical solutions and numerical solutions. A new fretting fatigue life prediction model has been proposed base on friction work. The rationality and effectiveness of the model are validated according to the contrast of experiment life and predicting life. At last influence factor on fretting fatigue life of aerial aluminum alloy LY12CZ is investigated with the model. The results reveal that fretting fatigue life decreases monotonously with the increasing of normal load and then becomes constant at higher pressures. At low normal load, fretting fatigue life increases with the incline of pad radius. At high normal load, however, the fretting fatigue life is unrelated with the fretting pad radius. The bulk stress amplitude has the dominant effect on fretting fatigue life. The fretting fatigue life diminishes as the bulk stress amplitude increases. © 2011 IEEE.

Sun H.,Shijiazhuang Mechanical Engineering College | Ma J.,Shijiazhuang Mechanical Engineering College | Sheng L.,Shijiazhuang Mechanical Engineering College | Li W.,Naval Flying Academy | Wu D.,Shijiazhuang Mechanical Engineering College
Applied Mechanics and Materials | Year: 2012

A coupled constitutive model of viscoplasticity and ductile damage for penetration problems has been deduced. The model proposed by Lemaitre was based on the continuum damage mechanics. In the model, large strain, high strain-rate, thermal softening and damage evolution were taken into account. At the meanwhile, Von Mises yield criterion, Johnson-Cook hardening model and Johnson-Cook fracture strain model were adopted. The model was implemented in the explicit finite element code Abaqus\Explicit through the Vumat subroutine by using an efficient explicit time integration algorithm. Based on the model, the rotating band's engraving process was simulated, at the same time the influence of the stress state on damage evolution and the thermal softening effect was discussed. An effective way to simulate the fire process of gun was afforded. © (2012) Trans Tech Publications.

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