Research On Optimization Of Sound Field Uniformity In Room Based On QRD

In recent years,with the development of science and technology and the improvement of people's living standards,the sound field design of small rooms has received increasing attention.QRD diffuser(secondary remainder diffuser)has the structural characteristics of low-frequency sound absorption and high-frequency diffusion,and is a common new material for regulating the uniformity of the sound field in the design of the sound field in a small room.However,current scientific researchers mainly focus on widening the bandwidth of QRD diffuser materials in different ways,reducing the size of the materials,and improving the acoustic and application performance of the materials.There is insufficient scientific research on the application methods of QRD diffusers,and there is a lack of discussion on the rationality of the size and arrangement of QRD diffusers.This article studies the arrangement of QRD diffusers in small rooms.On the one hand,the experimental testing and simulation analysis of different arrangements of QRD diffusers are conducted in the small room acoustic laboratory.On the other hand,the arrangement of QRD diffusers is verified by comparison with the reverberation room experiment.The rationality of the way.Based on the EDT,T20,T30,SPL and small room impulse response parameters of the sound field of the small room,the study compares the theoretical,simulation and experimental test results of the use area and arrangement of the QRD diffuser to optimize the small room Sound field uniformity,with a view to providing reference and reference for small room sound field design and debugging of sound field uniformity.This study draws on the following conclusions with the help of COMSOL Multiphysics multiphysics analysis software,ODEON acoustic simulation software and experimental measurement comparison analysis:(1)The ratio of QRD diffuser to the wall area in a small room has a great influence on the degree of curve coincidence,and the experimental test in the reverberation room also verifies this.In order to ensure the effect of low-frequency sound absorption and high-frequency diffusion of the QRD diffuser,the number of QRD diffusers arranged needs to be suitable for small rooms.In this study,when the area of the QRD diffuser accounts for about 30%?70% of the wall area,the difference in sound pressure level tends to 0,and the sound field uniformity is good.(2)The arrangement of QRD diffusers in different positions in the small room has a great influence on the flatness of the curve and the coincidence of the sound pressure curves at various points,and the reverberation room experiment has also verified this.In order to ensure the low-frequency sound absorption and high-frequency diffusion effect of QRD materials,the material should be placed at the maximum position of the sound pressure value in the low-frequency mode to exert the low-frequency sound absorption effect of the material.Comparing the simulation and experimental research in the small room,it can be concluded that the QRD diffuser is evenly distributed on the ceiling(ceiling)or one of the side walls,and the sound field uniformity of the small room is good.(3)Within a reasonable range,as the ratio of the area of the diffuser increases,the smaller the difference in sound pressure level between the measurement points;the smoother the reverberation curve;the smaller the fluctuation in the time-domain amplitude curve,and the coincidence of the sound pressure curves at each measurement point The higher the degree.As the area of the QRD diffuser increases,the lower the low-frequency sound pressure level fluctuation,the higher the degree of coincidence of the sound pressure curves at each measurement point.