The Analysis And Research Of Metal Rubber's Performance In Sound Absorption And Reduction

The research of Metal Rubber(MR) material's performance in sound absorption is a new orientation in MR technology area. Because of MR has the advantages of wide work temperature range, corrosion resistance, high load ability, high valid porosity, stable performance and adjustable structure, MR can be employed as the sound-absorbing material in the contemporary muffler. Moreover it has an excellent performance compared with other material in the special environment of space technology and national defense area. This dissertation does deep research in sound absorption performance of MR from theory and experiment aspects and indicates the sound absorption and noise reduction property of MR.Based on the sufficient analyses of development about porous and sound absorptive material at home and abroad, this paper announces the validity and feature of MR's use in sound absorption and noise reduction project. After the analyses of acoustics property parameter and sound absorption performance of MR, the sound absorption performance parameter calculation formula and the acoustic property parameter relationship style are deduced and MR sound-absorbing peak value frequencies computational method is studied. Based on the analyse of MR structural property, acoustic wave equation is concluded.To meet the requirement of precision in experiment of MR's sound absorption performance and be convenient for the analysis of experiment error, the standing wave tube instrument for the experiment is tested and debug. After the source of the main error is analyzed and the value of the error from these sources was examined separately, a method was found to improve the experiment precision.The paper studies the manufacture process of MR compenent for sound absorption and compares the sound absorption character of MR with other material. The experiment investigates the influence of MR structural parameter and rear air straturm on sound absorption performance. The sound-absorbing property parameter of MR is analyzed in the calculation, the similar relationship style between stuff thickness and stuff first sound-absorbing peak frequency are established and MR compositions constant values and stuff flow resistance are fixed. It is concluded that MR has a good performance in sound absorption and noise reduction , and is...