车辆内部声场的贡献度分析

ANALYSIS OF CONTRIBUTION DEGREE FOR INTERIOR SOUND FIELD OF A VEHICLE CAB

首先由线性波动方程推导出车内声场的边界积分方程，经边界元离散得到已知声场边界的振动速度场，求解其内部声压的线性方程组。进一步提出边界表面上的声压对声场内某点声压的贡献度概念，为降低车内某点处的声压提供对车室壁板进行结构修改的理论依据，最后对这一理论进行了验证。

The boundary integral equation of interior sound field of a vehicle cab has been derived based on a linear wave equation. The linear BFE equations are established by which the inte-rior sound pressure can be calculated if the boundary velocities are known. And furthe thecontribution degree of the sound pressure on the boundary to one in the interior sound field isstudied in order to furnish the theory basis for modifying the boundary structure of the cab toreduce the interior sound pressure in some points. At last,an experiment is made for checkingthe above equation.