基于声辐射度的耦合空间声能衰变模拟方法

Acoustical Radiosity Model for Sound Decays in Coupled Spaces

摘要:

针对耦合空间中的声能衰变,提出一种改进的声辐射度模拟方法.该方法将耦合开口设为分属于2个子空间的虚拟界面,通过虚拟界面上声辐射度的接收和传播实现子空间声能交换.改进的模拟方法将耦合空间分为2个独立的子空间分别进行声辐射度计算,在有效降低计算量的同时克服了子空间面元有效性判断所产生的误差,提高了模拟的准确性和计算的收敛速度.实测与模拟结果的对比表明,基于声辐射度的改进模拟方法对耦合空间中声能衰变具有较好的预测精度.

Abstract:

An improved model based on acoustical radiosity was proposed to investigate sound decays in a system of two coupled spaces.The coupling aperture was assumed to be two virtual surfaces and the acoustical radiosity on these surfaces was employed to implement sound energy exchange between two subspaces.Therefore,the computation of acoustical radiosity can be individually conducted in each subspace,and the computational expense is reduced significantly.Moreover,the improved model avoids errors due to visibility checking for elements on different subspace boundaries.Comparisons with field measurements show that the improved acoustical radiosity model can predict sound decays accurately in coupled spaces and has satisfactory convergence.