Abstract
This paper describes the idea for reducing fan noise by structure-borne sound control. Firstly we develop a new method for identifying the contribution of structure-borne sound and air-borne sound to fan noise by using experimental statistical energy analysis (Experimental SEA). We had proposed the process for reducing structure-borne sound on machinery by using Experimental SEA. In this process we had developed the way to evaluate the sound pressure level s at the assessment points by considering only the structural SEA subsystems which are able to be carried out the countermeasure. We introduced the conversion coefficients of each structural SEA subsystem to the sound pressure at the points. The contributions of sturucture-borne and air-borne sounds are determined by using the experimental SEA model, the conversion coefficients and the subsystem energies in operation. This method is demonstrated to apply fan noise on PC.
