Vibration and Acoustic Radiation from Axially Stiffened Finite Cylindrical Shells in Water
LIAO Chang-Jiang1, 2, JIANG Wei-Kang1, WANG Yun2, DUAN Hao2
1 State key lab of Mechanical system & vibration, Institute of Vibration, Shock & Noise,Shanghai Jiaotong University, Shanghai, 200240, China;2 Kunming Branch of the No. 705 Institute of China Ship Heavy Industry Group Corporation, KunMing 650118, China
Abstract：The coupled vibration equation of axially stiffened finite cylindrical shell is derived, in this equation additional impedance caused by the axial stiffeners is added to the coupled vibration equation. As a result, the vibration and sound radiation of shell depend on the mechanical impedance of shell, the radiation sound impedance and the additional impedance. Based on the numerical simulation, the influencing factors for sound radiation characteristics of submerged simply-supported thin finite length cylindrical shells excited by external force were investigated. It is found that the axial stiffener number just has a slight influence on radiated sound power, whereas structural damping has a great influence on radiated power and radial quadratic velocity on the surface of shell. This study can give some guidelines for noise reduction of this kind of shell.
2009, Vol. 28 
