基于激光测振仪的非轴对称超声驻波声场的识别

doi:10.13229/j.cnki.jdxbgxb20170359

摘要/Abstract

摘要： 针对驻波悬浮辐射/反射面之间(谐振腔内)的非轴对称声场,首先通过COMSOL仿真得到第3悬浮模式下声场典型截面上的声压分布。然后,采用Matlab编程将此声压进行Radon变换,得到该截面上各方向的激光测振仪(LDV)速度输出,并将其与实验得到的LDV速度输出进行对比,验证了LDV速度输出与声场声压的对应关系。最后,基于FBP算法并通过Matlab编程将实验中获得的LDV速度输出进行重建,得到该截面的声压分布,对比COMSOL仿真结果,从而验证非轴对称驻波声场的识别效果。

关键词: 自动控制技术, 超声驻波, 谐振腔, 声场识别, 激光测振仪速度输出, Radon变换, 滤波反投影算法

Abstract: Measuring the acoustic pressure of standing wave is the basis of acoustic levitation. The non-axisymmetric acoustic field within the resonance cavity is analyzed. Firstly, the acoustic pressure distribution on the typical cross-section of the acoustic field in the third levitation mode is obtained by COMSOL simulation. The simulated acoustic pressure is Radon transformed to obtain the simulated LDV velocity output, which is compared with the experiment results to verify the relationship between LDV velocity output and acoustic pressure distribution. Then, based on Filer Back Projection (FBP) algorithm, a self-written MATLAB code is used to reconstruct the LDV velocity output in the experiment and obtain the acoustic pressure distribution of the cross-section, which is compared with the COMSOL simulation results. The identification effect of the non-axisymmetric standing wave acoustic filed is verified.

Key words: technology of automatic control, ultrasonic standing wave, resonance cavity, acoustic field identification, LDV velocity output, Radon transform, filtered back projection (FBP) algorithm

中图分类号:

TD24

董惠娟, 于震, 樊继壮. 基于激光测振仪的非轴对称超声驻波声场的识别[J]. 吉林大学学报(工学版), 2018, 48(4): 1191-1198.

DONG Hui-juan, YU Zhen, FAN Ji-zhuang. Identification of non-axisymmetric ultrasonic standing wave field using laser Doppler vibrometer[J]. 吉林大学学报(工学版), 2018, 48(4): 1191-1198.

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