Sound radiation of a functionally graded material cylindrical shell in water by mobility method

作     者：Buqing Xu,1,2, ) Shaopu Yang,3, and Haoyu Li1, 1)Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 2)Provincial Laboratory of Traffic Safety and Control of Hebei, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 3)Shijiazhuang Tiedao University, Shijiazhuang 050043, China 

作者机构：Shijiazhuang Tiedao University Shijiazhuang 050043 China 

出 版 物：《Theoretical & Applied Mechanics Letters》 (力学快报（英文版）)

年 卷 期：2011年第1卷第6期

页      面：69-74页

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Key Project of the National Natural Science Foundation of China (10932006) Hebei Natural Science Foundation (2011210055) Hebei Key Basic Research Project (10963528D) 

主　　题：fluid-loaded cylindrical shell functionally graded material mobility method sound radiation 

摘      要：Based on the fundamental dynamic equations of functionally graded material (FGM) cylindrical shell, this paper investigates the sound radiation of vibrational FGM shell in water by mobility method. This model takes into account the exterior fluid loading due to the sound press radiated by the FGM shell. The FGM cylindrical shell was excited by a harmonic line radial force uniformly distributing along the generator. The FGM shell equations of motion, the Helmholtz equation in the exterior fluid medium and the continuity equation at fluid-shell interface are used in this vibroacoustic problem. The expressions of sound radiation efficiency and sound field of the FGM shell have been derived by mobility method. Radiation efficiency, modal mobility and the directivity pattern of the sound field are solved numerically. In particular, radiation efficiency and directivity pattern with various power law index are analyzed.