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所发展的测量随机振动的方法,是测量由物体表面一个点漫射形成的散斑场的相关统计特性.根据激光散斑运动规律,这个相关统计特性实时地反映该点的位移或转角的时间历程.由所记录的相关信息,通过频谱分析,可以得到运动的频城特性参数,这种方式是非接触式光测方法,对物体无任何附加质量的影响.本文以铜梁和钢梁为例.测量了冲击力作用下,梁的动态响应和频谱.
The developed method for measuring random vibration is to measure the statistical properties of speckle fields formed by the diffusion of a point on the surface of the object.According to the laser speckle motion law, this correlation statistic reflects the time or displacement of the point in real time History.According to the relevant information recorded, frequency spectrum analysis can be used to obtain the frequency-domain characteristic parameters of motion, which is a non-contact photometric method without any additional mass impact on the object.In this paper, copper beam and steel beam are taken as examples. The impact of the beam, the dynamic response and frequency spectrum.