密频系统模态参数辨识及其振动控制的研究进展

由于结构越来越复杂（如典型的大型柔性空间结构、准对称结构等）,系统的自由度不仅大大增加,还存在频率集聚现象。针对密频系统的模态参数辨识及其振动控制问题,从密频模态的判定准则,密频系统的模态分析方法、模态参数辨识方法,密频系统的可控性和可观性、模态截断准则以及密频系统振动控制律的设计等几个方面进行了较为全面的总结和回顾,对其中的辨识方法及判定准则作了比较。最后给出了密频系统的模态参数辨识及其振动控制中目前难以解决的问题,并指出这些方法将在卫星太阳能帆板、直升机旋翼、涡轮发动机叶片等存在密集模态的结构方面有着广阔的应用前景。

SYUDY PROGRESSES IN MOIDAL PARAMETERS IDENTIFICATION AND VIBRATION CONTROL OF SYSTEMS WITH CROWDED MODES

Vibration analysis of structures,such as typical large flexible space structures(LFSS) or norm-symme-tric structures,are so complex that the number of DOF greatly increases and the natural frequencies occur in "clusters".In order to identify modal parameters and attenuate vibration of systems with crowded modes,determining rules of crowded modes,modal analysis techniques and modal parameters identification methods,controllability and observability of systems with crowded modes,modal truncation rules and vibration attenuation laws are roundly summed up and reviewed,es-pecially,identification methods and determining rules are compared with each other.Furthermore,existing difficulties of parameters identification and vibration attenuation of systems with crowded modes are analyzed.Finally,it is shown that the methods mentioned above are potential in identification of modal parameters and vibration suppression of structures with crowded modes,including flexible spacecraft structures such as,satellite antennae and solar energy panels,rotating blades of helicopter,turbines and turbo-machines.