Verification of coverage of inverse-numerical acoustic analysis

This paper describes the influence of both air-borne noise and structure-borne noise (input) by using inverse-numerical acoustic analysis. Inverse-numerical acoustic analysis is a technique for calculating the vibration of the surface of the sound source by measuring sound pressure around the sound source. Therefore, vibrations with a high contribution to sound radiation can be identified by this technique. Moreover this technique can calculate the vibration of the engine with a complex shape. Therefore, this technique is a powerful method in acoustic problems. However, accuracy of the identification result of the engine vibration might changes because of various factors. Therefore, Noise source’s form must be considered. Noise source’s form is whether the sound source contained in the structure-borne noise or the air-borne noise. Then, this paper focused on the oil pan that is penetrated by the combustion sound and the engine vibration easily. In addition, the accuracy using inverse-numerical acoustic analysis for oil pan was verified for the structure-borne noise or the air-borne noise respectively.