Abstract
To reduce the structure-borne sound is an important issue to increase the value of the product. Structure-borne sound is caused generally by natural vibration of structure. Natural vibration is generated by the superposition of reflected and transmitted wave. To quantify the degree of wave reflection and transmission, reflection and transmission coefficients are used. This paper describes a method which quantifies wave reflection and transmission coefficients of discontinuities in one-dimensional structure using the finite element model. The method is based on the transfer matrix representing the relationship between wave amplitude of both ends of target structure. By modelling a discontinuity by using finite element method, reflection and transmission coefficients at discontinuity can be obtained. In order to verify the accuracy of this method, reflection and transmission coefficients obtained by our proposed method were compared with those of the two part beam that have theoretical solution. Finally, feasibility of this method was checked by several examples.
