摘要
为了提高分布式结构声源的声场重建精度,本文提出了基于单元辐射叠加法的结构声源声场重建方法.该方法首先利用声场叠加原理和结构振声传递特性,建立了结构声源表面振动与辐射声场之间的振声传递关系解析表达式,得到便于快速计算的振声传递矩阵,能够解决连续分布、相干结构噪声源的声传播模型精细化表征问题.然后利用振声传递矩阵作为传递算子进行声场重建,并与迭代加权算法相结合.通过将基于单元辐射叠加法的声场预报结果与解析法预报结果进行比较,验证了单元辐射叠加法具有较高的准确性.并将基于单元辐射叠加法的声场重建方法与传统等效源法近场声全息和迭代加权等效源法相比较,通过仿真分析与矩形板声场重建实验证明了基于单元辐射叠加法的声场重建方法能够改善结构声源的声场重建精度并增大近场声全息的有效测试距离范围.
In order to improve the sound field reconstruction accuracy of distributed structural source,a new near-field acoustic holography is established based on the element radiation superposition method(ERSM).In the proposed method,the surface of structural source is divided into several regular pistons.The sound field of structural source is considered as the superposition of sound field of pistons.Firstly,we compare the sound field calculated by ERSM with that by Rayleigh's integral.It is proved that ERSM is quite accurate in sound field prediction.Based on ERSM,a vibration acoustic transfer(VAT)function is derived.The VAT function has computable analytical expression and embodies the transfer relationship between the structural source surface and the radiated sound field.The VAT function can precisely characterize the acoustic propagation of continuous distributed coherent sources.Subsequently,we employ the VAT function to replace the Green's function,and apply the VAT function to sound field reconstruction.Different with the equivalent source method(ESM)which is widely used in sound field reconstruction,ERSM directly divides the piston-sources on the surface of structural source rather than constructing the equivalent point-sources on a plane behind the structural source.Furthermore,we introduce a weight matrix into ERSM and iteratively calculate the vibration velocity for a more accurate result,and we call the proposed method as iterative weighted ERSM(IWERSM).In this paper,the simulations and experiment of sound field reconstruction of a rectangular plate are performed.In the proposed method,the rectangular plate is divided into several rectangular pistons.The reconstruction results of ERSM and IWERSM are compared with that of ESM and iterative weighted ESM(IWESM)respectively.The reconstruction accuracies at different distances between the plate and array(test distances)are analyzed.The simulation results show the accuracy of ERSM and IWERSM are better than that of ESM and IWESM respectively.With the increase of test distance,the phenomenon is more obvious,and IWERSM even shows a good reconstruction accuracy while the test distance is more than half a wavelength.The experiment results also validate that ERSM and IWERSM have better reconstruction accuracy than ESM and IWESM respectively at the same test distance.In a word,the simulations and experiments demonstrate that the proposed method can improve the sound field reconstruction accuracy of regular structural source and expand the valid test distance of near-field acoustic holography.
作者
时胜国
高塬
张昊阳
杨博全
Shi Sheng-Guo;Gao Yuan;Zhang Hao-Yang;Yang Bo-Quan(Acoustic Science and Technology Laboratory,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology,Harbin 150001,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第13期146-159,共14页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61701133)资助的课题.
关键词
结构声源
单元辐射叠加法
近场声全息
声场重建
distributed structural source
element radiation superposition method
near-field acoustic holography
sound field reconstruction
作者简介
通信作者:张昊阳,E-mail:zhanghaoyang@hrbeu.edu.cn。
