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本文从理论上分析了利用散斑场的相关统计特性,非接触地记录振动物体时间域自由响应信息,并根据多点同时采集的时间域信号,利用频率域及时间域系统识别技术,进行动态参数识别.实测了微型悬臂梁的弯曲振动、小型三自由度轴的扭振,识别出的动态特性参数与理论值达到很好的一致.从而说明.这一光测——计算机分析系统为微小型物体的动态特性参数识别提供了一条有效途径.
In this paper, the statistical characteristics of the speckle field are analyzed theoretically. The free time domain response information of the vibrating object is recorded contactlessly. Based on the time domain signals acquired simultaneously by multiple points, the system uses frequency domain and time domain system identification to perform dynamic Parameter identification.The bending vibration of miniature cantilever beam and the torsional vibration of small three-degree-of-freedom shaft are measured, and the dynamic characteristic parameters identified are in good agreement with the theoretical value.Thus, this optical-computer analysis system is a micro Dynamic characteristics of small objects parameter identification provides an effective way.