多自由度微振动环境时域波形复现的数值仿真

Numerical simulation of time domain waveform reproduction of micro-vibration environment of multi-degree of freedom

为满足航天器微振动环境模拟的需要,开展了多自由度微振动时域波形复现控制方法研究。首先,介绍了基于时域波形复现的多自由度微振动环境模拟控制理论方法。其次,针对六自由度微振动激励系统,应用MATLAB软件建立了基于实测传递函数矩阵的多输入多输出微振动激励仿真系统,针对微振动时域波形复现闭环控制过程进行了算法编程,并给出了仿真的闭环控制流程图。最后,通过算例对多自由度微振动时域波形复现进行了数值仿真,以给定的白噪声为输入,模拟对实际存在的系统非线性、测量误差等影响因素的控制效果。仿真结果验证了多自由度微振动时域波形复现控制方法的可行性及有效性,所得结论可以为研究多自由度微振动时域波形复现控制系统提供参考。

A method of the time domain waveform reproduction （TWR） of micro-vibration of multi-degrees of freedom is proposed to meet the requirement of the micro-vibration environment simulation for spacecraft. Firstly, the theory of the micro-vibration environment simulation based on the time domain waveform reproduction is discussed. Then, a multi-input - multi-output （MIMO） micro-vibration incitation system is established using the MATLAB software based on the transfer function matrix measured in test. The control program for the micro-vibration TWR is developed based on the flow chart of the closed-loop control. Finally, the noise that shows the nonlinear influence of system and measurement errors is added in the simulation examples. Simulation results demonstrate the feasibility and the effectiveness of the control method of the TWR, which could be used for the study of the micro-vibration TWR control of multi-degree of freedom.