Abstract：Sound transmission loss of dash has been analyzed with structure-sound interaction method. Comparing with the sound transmission experiment, the method is verified to be reliable and feasible. In contrast with steel dash on sound transmission performance, the magnesium one has well sound transmission performance. By dividing the dash into several panels and with the response of dash from incident sound field, the dash sound radiation model is made to calculate the radiating sound field from dash at the side of driving room to find frequencies that have peak radiating sound pressure and sound power. With sound contribution analysis of point with highest sound pressure and acoustic power, the region that has the biggest influence on sound transmission loss valley also. Structural modification of this area was made to change the mode and sound transmission is calculated with that done. The result shows that the sound transmission loss has been raised by 5 dB after the modification, and the whole sound transmission performance of the dash has been enhanced.
2013, Vol. 32 
