声学技术模板.doc

文档介绍：不同媒介中的参量阵近场声场研究
李中政1,2,3,方尔正1,2
(1. 哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨 150001;
2. 哈尔滨工程大学水声工程学院,黑龙江哈尔滨 150001;3. 海军92198部队,辽宁兴城 125100)
摘要:在众多描述非线性声波传播的理论模型中,KZK方程能够准确地描述有限振幅声波传播的衍射、吸收及非线性效应,对求解参量阵近场声场有着明显的优势,因而成为描述非线性声场最为精确的方程之一。从KZK方程的频域求解出发,利用二阶对角隐式龙哥库塔法(second-order Diagonal Implicit Runge-Kutta, DIRK2)和Crank-Nicolson有限差分法(Crank-Nicolson Finite Difference, CNFD)相结合的有限差分算法,对在不同媒介中传播的参量阵近场声场特性进行研究,旨在对参量阵能量累积过程有进一步的理解,为参量阵转换效率的提高提供初步的探索,为参量阵的进一步工程应用提供相应的理论指导。
关键词:参量阵;近场声场;KZK方程;传播媒介
中图分类号:TB551 文献标识码:A
Research on the parametric array’s near-field acoustic
characteristics in different mediums
LI Zhong-zheng1,2,3, FANG Er-zheng1,2
(1. Acoustic Science and Technology Laboratory, Engineering University, Harbin 150001, Heilongjiang, China;
2. College of Underwater Acoustics Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China;
3. Unit 92198 of Naval, Xingcheng 125100, Liaoning, China)
Abstract: In numerous theoretical models of describing the nonlinear acoustic wave propagation, the KZK equation can accurately describe diffraction, absorption and the nonlinear propagation effects of finite amplitude sound beam, thus es one of the most accurate equation describing nonlinear ultrasonic field. In this paper, based on the frequency domain solution of the KZK equation, using second-order Diagonal Implicit Runge-Kutta(DIRK2) method and the Crank-Nicolson