Sound Transmission Loss Test and Theoretical Simulation Analysis of Sealing Strip Under Low Vacuum Environment

Abstract:

Based on the sound insulation theoretical model and experimental data of the double-layer plate structure， the sound transmission loss of the sealing strip was investigated in different air pressure. The results indicate that the air density decreases with the decrease of the air pressure in the source room， which leads to the increase of the sound transmission loss of the sealing strip. At the same time， the decrease of air pressure causes the membrane stresses of the sealing strip and then improves the material stiffness， which leads to the further increase of the sound transmission loss in the stiffness area. Because the sound insulation performance of the sealing strip is affected by both the air density and the pressure difference， it is necessary to pay attention to the change in the sound insulation performance when using the sealing strip in special situations such as high altitude.