Reconstruction of instantaneous surface normal velocity of a vibrating structure using interpolated time-domain equivalent source method
Reconstruction of instantaneous surface normal velocity of a vibrating structure using interpolated time-domain equivalent source method
复制标题
时域插值等效源法重建振动结构瞬时表面法向速度
DOI：
10.1016/j.ymssp.2018.01.020
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发表时间：
2018-07-01
影响因子：
8.4
通讯作者：
Zhang, Xiao-Zheng
中科院分区：
文献类型：
--
作者：
Geng, Lin;Bi, Chuan-Xing;Zhang, Xiao-Zheng
将时域插值等效源法推广到以质点速度随时间的变化为输入，重构振动结构的瞬时表面法向速度，为全面了解结构的瞬时振动行为提供了一种非接触的途径。在该方法中，时间演变的粒子在近场的速度是由一组位于振动结构内的等效源建模，然后等效源强度的积分通过迭代求解过程求解，并进一步用于计算瞬时表面法向速度。通过钢球撞击半圆柱形钢板的实验，分别以Microflows压力-速度探针测量的随时间变化的粒子法向速度和全息图表面压力作为扩展方法和基于压力测量的方法的输入，并以激光多普勒测振仪测得的板的瞬时表面法向速度作为比较基准。实验结果表明，该方法是一种在时域和空域上可视化振动结构瞬时表面法向速度的有力工具，比基于压力测量的方法获得更精确的结果。(C)2018爱思唯尔有限公司版权所有
Interpolated time-domain equivalent source method is extended to reconstruct the instantaneous surface normal velocity of a vibrating structure by using the time-evolving particle velocity as the input, which provides a non-contact way to overall understand the instantaneous vibration behavior of the structure. In this method, the time-evolving particle velocity in the near field is first modeled by a set of equivalent sources positioned inside the vibrating structure, and then the integrals of equivalent source strengths are solved by an iterative solving process and are further used to calculate the instantaneous surface normal velocity. An experiment of a semi-cylindrical steel plate impacted by a steel ball is investigated to examine the ability of the extended method, where the time-evolving normal particle velocity and pressure on the hologram surface measured by a Microflown pressure-velocity probe are used as the inputs of the extended method and the method based on pressure measurements, respectively, and the instantaneous surface normal velocity of the plate measured by a laser Doppler vibrometry is used as the reference for comparison. The experimental results demonstrate that the extended method is a powerful tool to visualize the instantaneous surface normal velocity of a vibrating structure in both time and space domains and can obtain more accurate results than that of the method based on pressure measurements. (C) 2018 Elsevier Ltd. All rights reserved.