基于回路整型设计的多轴振动控制

 多激励多轴向振动控制试验中,在频响函数矩阵呈现病态的频率点,控制点响应的自谱和互谱往往难以达到预定参考谱目标。针对这种情况,首先在控制频段对频响函数进行拟合修正,求得系统前置补偿矩阵,然后根据 H_∞回路整型理论对驱动谱矩阵进行整型,将整型后的驱动谱矩阵代替原驱动谱进入控制回路计算。通过试验验证表明,基于回路整型设计的修正算法,能够明显地抑制某些频段内频响函数的不良影响,自谱和互谱响应都能得到比较理想的控制结果。

Multi-axis Vibration Control Research via Loop-shaping Design

In multi-exciter/multi-axis (MEMA) vibration control tests, it is frequently difficult for the auto-spectra of the control point responses to achieve the required reference targets at the frequency points where the frequency response function matrices are ill-conditioned. To cope with this problem, a new method is proposed in this article. The pre-compensator of the plant is obtained by curve fitting and modifying of the frequency response functions in a specified frequency range. The exciting spectrum matrix is then shaped via H_∞ loop-shaping theory. The shaped exciting matrix is used in the control loop computation instead of the original one. The experiment shows that the modified algorithm via loop-shaping design is capable of suppressing the adverse effect of the frequency response function at some specific frequencies. The auto-spectra of the control point responses are improved and become satisfactory.