火箭橇靴轨接触特性数值分析

为研究火箭橇靴轨接触特性,采用Eluer-Bernouli梁单元对火箭橇橇体进行离散,建立了考虑轨道不平顺度的靴轨非线性接触力模型,通过Newmark-β结合Newton-Raphson局部迭代求解包含靴轨非线性接触力的橇轨动力学方程,并通过试验验证了数值解的正确性,数值计算结果表明:在700 m/s速度下,靴轨接触力...

Numerical analysis for slipper-rail contact characteristics of rocket sled

Here,to study slipper-rail contact characteristics of rocket sled,the rocket sled body was discretized with Euler-Bernoulli beam element,and the slipper-rail nonlinear contact force model considering track irregularity was established.Using Newmark-βmethod combined with Newton-Raphson local iteration,the sled-rail dynamic equation including slipper-rail nonlinear contact force was solved numerically,and the correctness of the numerical solution was verified with tests.The numerical results showed that the peak value of slipper-rail contact force is 2.27×10⁶ N at the speed of 700 m/s,the single slipper-rail collision time is 0.35 ms-0.45 ms;the slipper-rail collision time is directly proportional to the heading speed of rocket sled;at the speed of 700 m/s,the sled-rail collision time accounts for 26.0%of the total time;the slipper-rail contact speed is directly proportional to square of heading speed;if 2.54 m/s is taken as the maximum contact speed that rail can bear,the upper limit of heading speed of rocket sled is 820 m/s.