低真空环境下密封带传声损失试验与理论仿真分析

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

摘要:

基于双层板结构传声损失理论模型和试验数据，对不同气压影响下密封带传声损失性能进行了探究。结果表明：随着发声室气压的下降，空气密度随之降低，导致密封带传声损失性能上升；同时内外气压差使密封带产生内应力进而提高了材料刚度，导致密封带在刚度控制区传声损失性能进一步上升。由于密封带传声损失性能同时受空气密度及气压差影响，因此在高海拔地区等特殊情况下使用密封带需要注意其传声损失性能的变化。

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.