NUMERICAL CALCULATION AND EXPERIMENTAL RESEARCH ON SOUND LOUDNESS IN SOUND FIELD OF STRUCTURAL-ACOUSTIC COUPLING CAVITY

The influence of sound loudness in an enclosed cavity caused by thickness variation of plastic plate, which is simply supported on an enclosed cavity with five rigid walls and excited by a harmonic force, is studied in this article by using numerical algorithms. Based on Finite Element Method (FEM) and Zwicker's Loudness Model, loudness in a structural-acoustic coupled cavity can be obtained by numerical algorithms. An experiment is designed to verify the numerical model. The value of loudness in a cavity with one plastic plate simply supported with its thickness variation is measured by using B&K PULSE 3560C data analysis system. The numerical calculation model is accurate after comparison between numerical calculation result and the experimental result.