基于回路整型设计的多轴振动控制  

Multi-axis Vibration Control Research via Loop-shaping Design

作　　者：姜双燕[1] 陈怀海[1] 贺旭东[1] 游伟倩[1] 

机构地区：[1]南京航空航天大学振动工程研究所飞行器结构力学与控制教育部重点实验室,江苏南京210016

出　　处：《航空学报》2010年第10期1940-1945,共6页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(10972104)

摘　　要：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。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.

关 键 词：回路整型设计 多激励多轴向 振动试验 振动控制 多输入多输出 

分 类 号：V216.5[航空宇航科学与技术—航空宇航推进理论与工程] O234[理学—运筹学与控制论]