房间隔声的声辐射度模拟计算

Prediction of Sound Insulation between Rooms Using Acoustical Radiosity Model

为计算房间之间的空气声隔声,提出一种基于声辐射度的隔声计算模型。通过房间之间的声辐射度传递,模拟房间隔声中的声传播,建立房间的声辐射度系统方程。通过辐射度方程的数值求解实现隔声房间的声场模拟,由此计算获得房间之间的隔声量。通过房间隔声的实测对比验证该隔声计算模型的正确性。对于不同条件的房间隔声模拟表明,当房间中声场扩散度较高时该隔声模型与统计声学模型的结果符合良好;当房间中的声场偏离扩散场时,该模型仍可准确计算房间隔声量,因而具有广泛的适用性。

A model based on acoustical radiosity was proposed to investigate the airborne sound insulation between rooms.The sound transmission between the sound insulation rooms was obtained by simulating the propagation of acoustical radiosity through the partition wall.The system equations of the acoustical radiosity was established.The acoustical radiosity equations was solved numerically and the sound fields in the rooms were simulated.Consequently,the sound insulation between the rooms was derived.The sound insulation modelling was validated by comparing the results with those of sound insulation tests.Sound insulation simulations for several sound insulation rooms with various configurations of sound fields show that the model is in a good agreement with statistical theory when the sound fields are highly diffusive,and it is still valid when the sound fields are less diffusive.Therefore,the acoustical radiosity method developed in this paper has a board application prospect.