驾驶室结构声的统计能量分析

研究以统计模态特性估计宽带激励系统结构声传输的有效方法。以统计能量分析特征参数对结构与声振动进行统一动态描述,建立了多声振源激励的复杂多重结构声振系统响应估计的矩阵方程,并应用于驾驶室模型动态响应的预示分析。研究表明:激励频率接近箱体壁板临界频率时,壁板结构与流体声场之间形成强烈交互作用,成为室内声压级提高的重要原因。统计能量分析为研究声场与固体结构振动之间的交互作用、结构的机械性质等对噪声辐射和结构振动效应提供了可行途径。

Prediction of structure-borne sound transmission in driver compartment using statistical energy analysis

The high frequency responses of coupled structures and acoustical fields under complex random excitations are investigated. A matrix equation for prediction of sound transmission for complicated system consisting of any numbers of acoustic rooms and structures is established. The analysis method is used to study the sound pressure level of a driver compartment under wide-band excitation, and the mechanism of the dynamic response and parameters that govern the response are examined based on the results obtained from numerical calculations. Theoretical predictions show that the strong interaction between coupled structures and acoustical field greatly increases the energy levels in subsystems.The generalized statistical energy analysis is a useful method for estimating the global dynamic behavior of coupled structures and acoustical fields at high frequency.