应用激光测振技术提高模态试验测量准确度

摘要

The vibration of a beam is studied. A scanning laser vibrometer system is used to measure the natural frequency and modal of transverse and longitudinal vibration. The experimental results is well consistent with the theoretical modal analysis results. Compared with the results obtained from traditional transducer measurement, it shows that the measure accuracy can be improved by the laser Doppler technique and the problem of append mass and rigidness to the structure caused from transducer measurement can be solved. The technique is well used especially in the modal measurement of light and thin structure.%以一个标准直梁为研究对象,应用扫描式激光测振系统对梁进行了模态测量,得到梁的弯曲振动和纵向振动固有频率和振型,光测结果与理论计算结果相符.与传统的传感器测量结果相比,激光多普勒测振技术测量准确度高,可以很好的解决传感器对结构产生的附加质量的问题,尤其适用于轻薄结构的模态测量.