标题：Sound power radiation from a vibrating structure in terms of structure-dependent radiation modes
作者：Ji, Lin ;Bolton, J. Stuart
作者机构：[Ji, Lin ] School of Mechanical Engineering, Shandong University, Jinan; 250062, China;[Bolton, J. Stuart ] Ray W. Herrick Laboratories, School of Mec 更多
会议名称：21st International Congress on Sound and Vibration 2014, ICSV 2014
会议日期：13 July 2014 through 17 July 2014
来源：21st International Congress on Sound and Vibration 2014, ICSV 2014
摘要：A new technique for describing the sound power radiation from a vibrating structure is introduced that is based on a set of uncoupled, structure-dependent radiation modes (s-modes). These modes differ from conventional acoustic radiation modes (a-modes) since s-modes are determined by not only the radiation resistance matrix of the structure but also its structural vibration modes. In principle, s-modes are found to possess two significant advantages over a-modes: (1) the number of s-modes required to describe the radiated sound power from a vibrating structure is usually smaller than that of a-modes, especially in the higher frequency range where many vibration modes contribute to the structural vibration; (2) the definition of s-modes establishes a direct connection between the structural modes or structural wave propagation and their sound radiation properties; consequently, the inherent relationship between the modal properties/wave propagation characteristics of the structure and its sound radiation properties can be revealed in a convenient and explicit manner. Two examples, featuring baffled, finite models, i.e., an Euler-beam (1-dimensional) and a thin plate (2-dimensional), are employed to illustrate the main theoretical results of the present study.