Method by Loop-shaping Weighting Functions for the Multi-axis Vibration Test Control
Jiang Shuang-yan; Chen Huai-hai; He Xudong;Cui Xu-li
MOE Key Lab of Structure Mechanics and Control for Aircraft; Institute of Vibration Engineering Research; Nanjing University of Aeronautics and Astronautics; Nanjing, 210016; China
Abstract：H∞ loop-shaping control method is proposed in the paper for the MEMA(Multi Exciter/Multi Axis) random vibration test. In practice, the response spectrums of the control points are always difficult to meet the reference ones at the frequencies where the frequency response function matrices are ill-conditioned. An H∞ pre- compensator is decomposed and designd for the controller. The conditions of the frequecy response fucntion matrices are improved and the controlled plant is decoupled by an algorithm. The Fourier spectrum of the drive signal is shaped by the compensator in the control loop to replace the original one. The experiment shows that with the present method in this paper, the drive singal is mended, the response spectrums of the control points are improved because the poor conditions of the frequency response function at specified frequencies are rejected.
2011, Vol. 30 
