水下冲击波聚焦声场非线性建模与分析  

Nonlinear Modeling and Analysis of Underwater Shockwave Focusing Sound Field

作　　者：李宁[1] 雷开卓[1] 黄建国[1] 滕舵[1] 李华[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《系统仿真学报》2011年第1期61-64,共4页Journal of System Simulation

基　　金：西北工业大学科技创新基金(2007KJ01021)

摘　　要：通过聚焦可大幅提高水下冲击波声场的声压级。由于水下冲击波聚焦声场声压级高、瞬时性强,因此观察和测量难度较大,对测量设备的灵敏度要求较高。概述了水下冲击波的产生及聚焦原理,利用压力传感器实测了冲击波聚焦波形,采用有限元分析软件ANSYS建立了水下冲击波聚焦声场的有限元模型,仿真了水下冲击波聚焦声波的非线性传播过程和声场分布,对比分析了仿真结果与压力传感器实测波形、高速摄影机实拍的冲击波聚焦声场纹影图的相符性,仿真得出水下冲击波聚焦声场峰值压力的变化规律。仿真结果与实验测量、高速摄影实拍图高度吻合,说明仿真模型的正确性及利用ANSYS研究水下冲击波聚焦声场的可行性、有效性。The underwater shockwave＇s level can be increased by using the method of focus. Because the sound pressure level is high, and the sound field is instantaneous, it is difficult to observe and measure the underwater shockwave focusing sound field, and the method usually used is strict with the sensitivity of the equipment. The principle of the underwater shockwave＇s generation and focusing was summarized. By using the pressure sensor, the sound pressure at the sound axis of the underwater shockwave focusing sound field was measured. Based on the measured data, a finite element sound-field model was established by ANSYS and some simulations were done, including the propagation and the sound field distribution. The simulation results are in agreement with the truth shown by the pictures from the high speed camera. Furthermore, the pressure-distribution of the underwater shockwave focusing sound field is obtained. So, the modeling method based on ANSYS is reliable and effective in the studying of underwater focusing shockwave sound field.

关 键 词：水下冲击波 聚焦声场 有限元 ANSYS 传播规律 

分 类 号：TB525[理学—物理]