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Based on the structural features of projectile and concrete target, projectile damage mechanism and destroyed mode of target materials, utilizing the LS-DYNA which is a program that analyze dynamics to simulate the process of the target being intruded and damaged. The result is cohesive with theory and rules. At the same time, analyzing and validating the result by contrasting result and test result...
In this paper, the basic feature of particle system of coal stream is analyzed, the property model of coal stream particle is established by discrete element method according to its characteristics and a moving model is constructed by a simplified Hertz-Mindlin contact, and the coal stream movement is simulated with particle system, which plays an important role in assuring the fidelity and integrality...
In the present study, a series of terminal ballistics numerical analysis and experiments were performed to investigate the process for explosion load drive the based-water extinguisher dispersed. In the Numerical simulation, for the representative fire extinguishing warhead, the simulation model was built, The variety rule between the loading coefficient (drive charge divide liquid mass) and the breach...
A CFD study of the flow through vibrating screens has been conducted with moving body method of PHOENICS. The flow fields around the static and vibrating screens were calculated with laminar and turbulence models respectively, and the pressure-drop coefficients for both states were obtained. It was found that the flow field became very complex and vortex and backflow were produced because of the motion...
Virtual experiment is an approach to utilize numerical computation to study the complex physics processes, and is used widely in the areas of weapon system development and performance evaluation. The virtual experiment for warhead aims at studying various conditions of damage on target by warhead, analyzing the factors of warhead power, and provide the basis for the warhead design, with high quality...
As a kind of high-efficient separation equipment, hydrocyclone has been widely used. In order to improve its performance, the structures of different parts have been optimized in recent years. Especially for the inlet structures, they play an important role in internal flow field and separation efficiency. So in this paper, two kinds of hydrocyclones with typical inlets - axial-flow hydrocyclone and...
In this paper, two methods are described to predict the aerodynamic noise induced by flow around a cylinder using the linear model GM (1, 1) and the nonlinear model Verhult based on grey system theory. The grey prediction initial data is from large eddy simulation and acoustic analogy. The prediction results using the model GM(1, 1) are respectively compared to the numerical simulation results and...
Based on the three-dimensional Liu chaotic system, a state variable was added to construct a new hyperchaos Liu system. Through numerical simulation, the Lyapunov index spectrum, bifurcation diagram and phase diagram of the new hyperchaos Liu system were studied. Furthermore, its hardware circuits were implemented, and the corresponding waves of chaos were observed by oscillograph. At the same time,...
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