SPS夹层板传声损失特性研究

Study on sound transmission loss characteristics of SPS sandwich plates

利用简支模态双级数方法,研究了夹层板系统夹层板的隔声性能.首先将入射、反射及透射声压以简支模态双级数表示,考虑入射、反射及透射声压对夹层板的激励作用,基于双级数形式,推导了四边简支SPS夹层板的声振耦合方程;其次,通过流固耦合边界条件求解得到了SPS夹层板的传声损失,讨论了SPS参数对结构隔声性能的影响规律,结果表明芯层所用材料密度与声压入射角度对SPS夹层板隔声性能的影响较大;最后利用有限元仿真,验证了理论分析的有效性.

The acoustic insulation performance of an SPS sandwich plates is studied by means of simply supported mode double series method.Firstly,the incident,reflected and transmitted sound pressures are expressed as a simple supported mode double series,and then the excitation effect of incident,reflected and transmitted sound pressures on the sandwich plate is considered.Based on the double series form,the acoustic vibration coupling equation of the four-sided simply supported SPS sandwich plate is derived.The sound transmission loss of the SPS sandwich plate is obtained through the solution of the fluid-structure coupling boundary conditions.The influence of the system parameters of the SPS sandwich plate on sound insulation performance is discussed.The results show that the material density and sound pressure incident angle of the core layer have great influence on the sound insulation performance of the SPS sandwich plate.Finally,the validity of the theoretical analysis is verified by finite element simulation.