轨/姿控发动机推力矢量测试平台动态特性分析

采用模态分析法解耦矩阵,建立轨/姿控火箭发动机推力与推力矢量测试平台系统的传递函数,采用有限元方法预估了固有频率,并通过实验模态分析方法对测试平台系统进行了精确测试,得出了测试平台在实际安装状态下4 kHz以内的各阶固有频率、阻尼比、主振型、留数等模态参数.验证了有限元方法的分析结果和测试平台系统的合理性,并通过仿真计算和模拟实际试车状态的实验,验证了所建立的传递函数的准确性.

Analysis of thrust vector measuring platform for trajectory/attitude control engine dynamic characteristics

A transfer function was set up on the model of the thrust and thrust vector measuring platform for trajectory/attitude control rocket engine by using the principle of the mode-testing method to decouple the matrix.The finite-element analysis was used to evaluate the natural frequency.By using the mode-testing method,a more precise test of the measuring platform was done in order to get the natural frequency,damping ratio,principal modes of vibration and residual under 4 kHz of the measuring platform in the actual installation estate,which proved the validity of the finite-element analysis and the reasonableness of the measuring platform system.By using the model to analyze the influence on measure results of system parameters on MATLAB/Simulink environment,and experiment in the actual installation estate,the accuracy of the transfer function is proved.