摘要
研究了非定常流动对声传播的影响,采用了一般非线性声传播方程,该方程可以看作是Westervelt方程的推广形式.研究采用了流场马赫数较小且声场波动较小的先验条件.为了分析非定常流场对时频声场的影响,本文采用时域有限差分法(FDTD)在二维参数阵列模型下进行了仿真计算.研究结果表明流速大小及方向会在一定程度上影响声传播的非线性效应,从而导致非线性作用下产生的差频信号幅值和方向发生偏移.
The influence of unsteady flow on sound propagation is investigated by using a general nonlinear wave propagation equation,which can be regarded as an extended form of the Westervelt equation.The study is conducted under the prior conditions of low flow Mach number and small fluctuations in the sound field.In order to analyze the impact of unsteady flow on the time-frequency sound field,the paper employs the time-domain finite-difference method(FDTD)to perform simulation calculations on a two-dimensional parameter array model.The research results indicate that the magnitude and direction of the flow velocity can affect the nonlinear effects of wave propagation to a certain extent,leading to shifts in the amplitude and direction of the beat frequency signals generated under nonlinear conditions.
作者
陈广智
解龙翔
张玲玲
CHEN Guangzhi;XIE Longxiang;ZHANG Linging(School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu 215500,China)
出处
《常熟理工学院学报》
2024年第2期19-24,共6页
Journal of Changshu Institute of Technology
基金
国家自然科学基金重大研究计划重点支持项目“功能基元序构声学材料的耦合增强效应与逆向设计研究”(92263207)。
