点击次数：

发表时间： 2007-01-01

发表刊物： 船舶力学

期号： 4

页面范围： 628-636

ISSN号： 1007-7294

摘要： In the framework of energy dissipation theory, radiation damping of structural sound is proposed. Using the ratio between the dissipated energy and the total energy of a vibrating structure to account for the characteristics of radiation damping, a mathematical model for radiation damping is built. Based on the mathematical model, the radiation damping of a simply supported plate is calculated. The radiation damping of a stiffened plate under different damaged conditions is also investigated. Based on Mindlin theory, four-node health and damage shell finite elements are given, and then the finite element method is used to calculate the dynamic surface response of a structure. Isotropic damage elements are built by globally and isotropically weakening the stiffness. Anisotropic damage elements are built by using reduction coefficients for elasticity damages in x and y directions based on Kachanov's theory. Influences of various types of damages on acoustic radiation damping are studied. A computational method is established, aided by some typical examples, to analyze acoustic behavior of a damaged structure. Plates are widely-used in ship and ocean structures. The current method is useful for assessing the, influences of the damages present in a stiffened plate on its acoustic radiation properties.

备注： 新增回溯数据