Experimental modal analysis for vibration with large amplitude using moire topography
Experimental modal analysis for vibration with large amplitude using moire topography
复制标题
利用莫尔形貌进行大振幅振动的实验模态分析
DOI：
10.1117/12.281158
复制
发表时间：
1997
期刊：
影响因子：
1.9
通讯作者：
K. Shiraki
中科院分区：
文献类型：
--
作者：
Y. Arai;S. Yokozeki;K. Shiraki
本文提出了一种新的模态分析方法--莫尔形貌法。采用全息干涉法的模态分析用于振动分析，因为可以容易地实现非接触和2D测量。用全息干涉法进行模态分析是一种有效的方法，它适用于小振幅的振动，但很难应用于大振幅的振动，如几毫米以上的振动。本文用莫尔形貌系统对大振幅的振动进行了分析。利用计算机控制闪光时间的频闪仪，用投影莫尔形貌仪采集单条纹图像。采用基于新相位展开的空间条纹分析方法对图像进行分析。因此，可以在振动过程中检测振动物体的形状。该方法还可以分析具有复杂形状的物体的振动模态。用该方法分析了涡轮机叶片模拟模型的振动。通过计算模态参数，实现了振动模态的可视化。结果表明，本文提出的模态分析方法对分析大振幅振动是有效的。
A new modal analysis using moire topography is proposed in this paper. A modal analysis with holographic interferometry is employed for vibration analysis, because non-contact and 2D measurements can be readily realized. The modal analysis using holographic interferometry is an effective measure for a vibration with small amplitude, it however, is difficult to apply to a vibration with large amplitude, such as over a few mm. In this paper, a vibration with a large amplitude is analyzed using the moire topography system. Single fringe image is grabbed by the projection moire topography system using a stroboscope whose flash timing is controlled with a computer system. The image is analyzed by the spatial fringe analysis method based on a new phase unwrapping. Consequently, the shape of vibrating object can be detected in process of the vibration. The new method can also analyze the vibration mode of an object that has a complex sharp. The vibration of some plates as simulation models of turbine blades is analyzed by this method. Modal parameters are calculated, then a visualization of the mode of the vibration can be realized. The results show that the proposed modal analysis is effective for the analysis of the vibration with a large amplitude.