基于SPH方法的速度对火箭橇刨削的仿真分析

Simulation analysis of velocity to rocket sled planing based on SPH method

在火箭橇速度达到一定值后,由于剧烈的靴轨碰撞力,滑轨表面可能会产生高温、高应变率、大变形刨削现象,采用传统的有限元法由于受网格畸变的限制不能对其有效模拟。为能有效分析速度对火箭橇滑轨刨削现象影响,采用SPH方法对靴-轨材料进行离散,模拟滑轨的刨削现象,验证了SPH方法模拟滑轨刨削现象的有效性。在此基础上,分析研究了火箭橇滑靴航向速度、竖向冲击速度对滑轨刨削现象的影响。结果发现,在火箭橇航向速度超过Ma 5情况下,发生滑轨刨削的概率增大;竖向速度不变时,随着航向速度的增加,刨削位置基本相同;航向速度不变时,随着竖向速度的增加,发生刨削的时间更早。研究结果可为实际工程提供理论支撑。

When rocket sled speed reaches a certain value,the surface of the slide rail may be planed due to the severe shoe rail collision force.This phenomenon is a problem of high temperature,high strain rate and large deformation.The traditional finite element method cannot effectively simulate this phenomenon due to the limitation of grid distortion.In order to effectively analyze the impact of speed on the planing phenomenon of rocket sled slide,this paper uses the SPH-based method to discrete the shoe-rail material,simulates the planing phenomenon of the slide,and verifies the effectiveness of the SPH-based method to simulate the slide planing.On this basis,the influence of the heading speed and the vertical impact speed of the rocket sled shoe on the sliding rail planing is studied.The results show that the probability of the sliding rail planing increases when the heading speed of the rocket sled exceeds Ma5.When the vertical speed is constant,the planing position is basically the same with the increase of the heading speed.When the heading speed is constant,with the increase of the vertical speed,the time of planing is earlier.The research results can provide theoretical support for practical engineering problems.