直达声场试验平台的数值仿真方法研究

为了指导直达声场试验平台搭建，以替代成本较高的混响室试验，提出了一种速度边界等效扬声器声源的方法，并基于该等效方法建立了直达声场有限元模型，比较了不同区域内声压级响应，并与混响声场进行对比.研究表明，速度边界等效方法能准确模拟扬声器的指向性以及声压级响应，基于该方法建立的直达声场模型在靠近声场中心区域内响应结果与混响场吻合，能为直达声场试验中的可靠试验区域选取提供参考. 

Research on Numerical Simulation Method of Direct Field Acoustic Test Platform

In order to guide the construction of direct field acoustic test platform and replace high cost reverberation field acoustic test,a method of equivalent loudspeaker with velocity boundary was proposed. Based on this method,a finite element model of direct field acoustic test was established,and the responses of sound pressure level (SPL) in different regions were compared with that of the reverberation field. The results show that the velocity boundary equivalent method can accurately simulate the directivity and SPL response of the loudspeaker,and the response of the direct field model based on this method are consistent with the reverberation field near the center of the field,which can provide a reference for the selection of reliable test area in the direct field acoustic test.