结构声辐射主动控制中模态辐射效率分析

ANALYSIS OF MODAL RADIATION EFFICIENCY IN ACTIVE STRUCTURAL ACOUSTIC CONTROL

结构声辐射主动控制中，“控制溢出”是一个重要问题，它直接关系到结构声辐射主动控制的成败．本文从“结构模态声辐射效率”出发，提出了结构声辐射“优势模态”和“劣势模态”新概念，全面阐述了振动结构中各种模态对声场的影响，为解决低频结构声辐射主动控制中“控制溢出”的理论问题提供了一条有效的途径，文章中以四角简支矩形板为研究对象，对其模态辐射效率进行了理论推导并进行了结构声辐射主动控制实验验证，得出了和文中一致的结论．

In active structural acoustic control, the control spillover is a serious problem. It relates to success in active structrual acoustic control directly. In this paper, the concept of superior mode and inferior mode is presented according to the modal radiation efficiency, and the influence of various modes that acts on the sound field is discussed roundly. It provides an efficient method for solving the control spillover problem existing in active structural acoustic control. The model is deduced and tested in accordance with the object of fourcorner simple support rectangular plate, and the results between theory and experiment are the same.