WANG Bin TANG Weilin FAN Jun

(School of Naval Architecture, Ocean and Civil Engineering, Shanghai JiaoTong University  Shanghai 200240)

Received Oct.17, 2007 

Revised Dec.7, 2007

Abstract An approximate method is brought forward to predict the acoustic pressure based on the surface velocity. It is named Element Radiation Superposition Method (ERSM).The study finds that each element in Acoustic Transfer Vector (ATV) equals the acoustic pressure radiated by the corresponding surface element vibrating in unit velocity and other surface elements keep still, that is the acoustic pressure radiated by the corresponding baffled piston vibrating in unit velocity. So, it utilizes the acoustic pressure radiated by a baffled piston to establish the transfer relationship between the surface velocity and the acoustic pressure. The total acoustic pressure is obtained through summing up the products of the surface velocity and the transfer quantity. It adopts the regular baffle to fit the actual baffle in order to calculate the acoustic pressure radiated by the baffled piston. This approximate method has larger advantage in calculating speed and memory space than Boundary Element Method. Numerical simulations show that this approximate method is reasonable and feasible.

PACS numbers: 43.30, 43.40