Abstract
Due to compact and light-weight design, modern machines are strongly suffering from vibration and induced noise. In order to solve the noise problem, the structure of machine is so complex as to be accuractely modeled, therefore an Acoustic Building Block Approach (ABBA) is developed where the structure is divided into several components and the total acoustic characteristics of the machine in terms of natural frequencies and acoustic mode shapes can be predicted based on the individual acoustic characteristics of each component. Numerical models for pipe structure using acoustic Finite Element Analysis are used to verify the effectiveness of ABBA. Also the basic consideration on experimental methods is discussed to provide accurate measurement on acoustic characteristics of component.
