伺服机构负载模拟系统设计与动态特性分析

针对火箭发动机喷管伺服机构的负载模拟问题，采用机械的方式，设计了一种可对伺服机构的惯性负载、摩擦力矩负载、弹性力矩负载、安装刚度以及发动机喷管柔性特征进行模拟的负载模拟器，并建立了模拟器和伺服机构数学模型。仿真分析了惯性负载、弹性力矩以及喷管柔性对伺服机构负载多自由度特性的影响。通过对伺服机构扫频实验，负载模拟器中的负载在一定范围内调节，可复现伺服机构实际工作中的动态特性。说明该负载模拟器结构设计合理，从而为具有多自由度特性的火箭伺服机构的负载模拟系统设计提供参考。该系统已经得到实际应用。

Design and analysis on dynamic characteristic of servo mechanism’s load simulation system

In view of a load simulating problem of servo mechanism in launch vehicles, a new load simulator device was present, which could simulate the inertia, friction, elastic, servo mechanism mounting rigidity and flexibility characteristics of engine nozzle by the mechanical structures. The complete mathematical models of servo mechanism and load simulator device were constructed. The influence of inertia, elastic and flexible to multiple degrees of freedom was analyzed by simulation. A sweep frequency test of servo mechanism was made to repeat the dynamic characteristics of servo mechanism in practical work when some loads of load simulator device were adjusted in a certain range. The test results validate the reasonableness of the proposed design, which may be a reference for the design of load simulator device with multiple degrees of freedom property. Besides, the simulator has got an actual application.