牵制缓释放过程中火箭动力响应特性分析

为研究运载火箭在牵制缓释放过程中的结构动力响应特性,将牵制缓释放发射过程依次分为静态竖立、点火牵制和缓释放三个阶段进行计算。运用MSC.Patran有限元程序的场功能来实现上一阶段的全部计算结果场向下一阶段初始条件场的传递,运用MSC.Nastran有限元程序的非线性弹簧单元的非线性位移载荷函数功能来模拟运载火箭缓释放过程中的缓释力,实现运载火箭牵制缓释放过程结构动力响应的数值计算,并对比分析运载火箭几种常用发射释放方式的结构动力响应特性。结果表明:采用牵制缓释放系统可有效减小运载火箭释放时所受冲击载荷,减小运载火箭全箭结构动力响应。

Study on Launch Vehicle＇s Structure Transient Response in the Phases of Hold-down and Soft Release

In order to analyze the launch vehicle＇s structural dynamic responses in the phases of the hold-down and soft release（HDSR）, the take-off process of launch vehicle is divided into three phases, including the static phase, hold-down phase and the soft release phase. The fields function of MSC. Patran is used to achieve all the results field obtained on the upper phase transfer to the next phase. The MSC. Nastran＇s nonlinear spring ele- ment＇s nonlinear displacement vs. load function is also used to simulate release force acting on the launch vehi- cle in the soft release phase. The launch vehicle＇s structural dynamic responses are finally calculated. As a con- trast, the other two commonly used release techniques of launch vehicle are also analyzed. The computational results indicated the HDSR technique can reduce the impact load acting on the launch vehicle and reduce the launch vehicle＇s structural dynamic responses effectively.