파워흐름경계요소법을 이용한 중고주파 차량 소음 해석

In this paper, Power Flow Boundary Element Method (PFBEM) is developed as a new tool for the medium-Io-high frequency noise and vibration analysis. Fundamental solutions used for the boundary integral formulations are obtained from the PFA energy equations. Both the direct and indirect approaches for the various boundary conditions are investigated, and the numerical implementations are performed. To verify the accuracy, the developed method is applied to the prediction of the vibration energy distributions in the simple beams and thin plates, and the results are compared with exact PFA solutions. As practical examples, simple car cabins surrounded by the materials of different absorption coefficients are modeled and the distribution of the smoothed acoustical energy density is successfully predicted.