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Huludao, China

Li W.,Naval Air Force Academy | Ma J.-S.,Ordnance Engineering College | Di C.-C.,Ordnance Engineering College | Wu D.-L.,Ordnance Engineering College
Binggong Xuebao/Acta Armamentarii | Year: 2012

A mechanical-electrical-hydraulic coupling dynamic model of ramming system was built by using MSC. Adams and Easy5. Its confidence was proved by using VV&A. A virtual prototyping-Monte Carlo simulation-support vector machine (VP-MCS-SVM) method was proposed to reduce the large computational volume of MCS method in solving the random dynamics of complex system, and the random dynamics simulation of ramming system was carried out efficiently and precisely. Based on the theory of statistic inference and reliability, the action reliability of ramming system was analyzed and the distribution parameters' shift was considered. It provides a new idea for the action reliability evaluation for large complex system.

Sun H.-Y.,Ordnance Engineering College | Ma J.-S.,Ordnance Engineering College | Li W.,Naval Air Force Academy | Sheng L.-B.,Ordnance Engineering College | And 2 more authors.
Binggong Xuebao/Acta Armamentarii | Year: 2012

Considered the coupling effects of classical interior ballistic equations and band's engraving process, the solution of interior ballistic equations was taken as the boundary condition of the simulation for engraving process, and the results of the simulation were taken as the initial conditions for the interior ballistic equations in the next step iteratively. A coupled constitutive model considered visco-plasticity and ductile damage and based on continuum damage mechanics was introduced to simulate the band's damage process. The Von Mises yield criterion, Johnson-Cook hardening model and Johnson-Cook fracture strain model were adopted, and the model considered large strain, high strain-rate, thermal softening and damage evolution. The model was implemented in the explicit finite element code by using VUMAT subroutine of Abaqus\Explicit module. The band's engraving processes of two different bore structures were simulated, and the influences of different engraving conditions on the stress state of the band were analyzed. The effects of band's stress state and bore structure on the interior ballistic performances were pointed out. It is very useful for the design of bore structure.

Chen P.,Wuhan Naval University of Engineering | Chen P.,Naval Air Force Academy | Wu X.-F.,Wuhan Naval University of Engineering | Wu X.-F.,Navy Command Academy
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2013

According to the problem that the spiral call-search method is only feasible in theory, a novel optimal extended position search method based on improved particle swarm optimization (PSO) algorithm is proposed for the unmanned underwater vehicle (UUV) to search the uniform linear motion target. Firstly, based on the UUV's search width the model of optimal steering angle is established, and it is optimized by the improved PSO algorithm, then on that basis, another search method with unknown velocity of target is also analyzed. Secondly, several cooperative search methods of formation of the UUV based on different projection are discussed. Finally, the feasibility of the proposed method is proved by the results of simulation, and some suggestions are proposed for future development directions of the UUV.

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