LAUSR

Problems with regard to the optimized design of structure-borne acoustic radiation in the intermediate-frequency region were first studied in this paper. The multi-objective optimization model was established based on structural dynamic response equation and acoustic radiation equation. Acoustic vibration analysis of cavity structural model was conducted to determine intra-cavity noise sources under different random excitation conditions, and then appropriate design variables were selected. Results indicated that after structural size optimization under different excitation conditions, the intra-cavity sound pressure levels lowered to a certain degree. Particularly in the low-frequency region, the maximum decreasing amplitude of sound pressure level could reach 5–7 dB, and the acoustic performance of cavity structure improved favourably.