论文部分内容阅读
为了满足发射动力学快速分析的需要,采用多刚体动力学的绝对坐标方法以适应发射车约束复杂和变拓扑结构的特点,针对车载冷发射系统的典型结构和弹射物理过程,建立并应用了9自由度快速仿真模型。与ADAMS和ABAQUS仿真对比表明,本文计算的车架后支腿载荷偏差不超过4%,而仿真时间只有ADAMS的7.1%和ABAQUS的0.004%,能够快速有效地分析系统的动态特性。通过实例研究了发射管底座-车架支腿载荷比的动态特性和附加载荷分配因子对该载荷比均值及发射管口最大位移的影响。结果表明,发射管底座-车架支腿载荷比在发射过程中逐渐增大并达到稳定值,附加载荷分配因子决定了发射管内弹道压力载荷通过发射管底座和发射车支腿分散传递到地面的载荷分配比例,并且存在最佳附加载荷分配因子,能使弹体的弹射起动过程对系统的扰动影响最小。
In order to meet the need of rapid analysis of launching dynamics, the multi-rigid-body kinematic absolute coordinate method is adopted to adapt to the characteristics of launcher-constrained complex and variable topology. According to the typical structure and ejection physical process of vehicular cold-launch system, 9 Freedom degree fast simulation model. Compared with ADAMS and ABAQUS simulations, it is shown that the calculated deflection of the rear leg of the frame does not exceed 4% and the simulation time is only 7.1% of ADAMS and 0.004% of ABAQUS, which can analyze the dynamic characteristics of the system quickly and effectively. The dynamic characteristics of the tube-to-frame outrigger load ratio and the influence of additional load distribution factors on the average load ratio and the maximum displacement of the nozzle were studied by examples. The results show that the load-carrying ratio of the launch tube-frame leg gradually increases and reaches a stable value during launch, and the additional load distribution factor determines that the ballistic pressure load in the launch tube is dispersed and transmitted to the ground through the launch tube base and the launch vehicle leg Load distribution ratio, and there is an optimal additional load sharing factor, which can minimize the influence of the projectile launching process on the system disturbance.