局域共振型加筋板结构的带隙理论与减振降噪特性研究

项目名称： 局域共振型加筋板结构的带隙理论与减振降噪特性研究

项目编号： No.51305448

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 肖勇

作者单位： 中国人民解放军国防科学技术大学

项目金额： 25万元

中文摘要： 加筋板结构刚度大、重量轻，是列车、飞机、潜艇等装备中最常见的结构形式之一。加筋板结构的振动/噪声是降低装备性能的重要因素，因此研究加筋板结构的减振降噪理论和技术具有重要意义。本项目提出将声物理前沿的局域共振型声子晶体思想引入到加筋板结构的减振降噪设计，通过在加筋板结构上附加周期阵列的局域共振单元，构建了局域共振型加筋板结构。这种新型结构经特殊设计可以表现出显著的弹性波带隙（禁带）特性，利用其带隙可以有效地抑制加筋板中的弯曲波传播，进而实现对加筋板结构的减振降噪。本项目围绕局域共振型加筋板结构的带隙及声振特性计算方法、带隙调控规律与带隙形成机理、减振降噪特性及机理等方面开展系统深入研究。项目的研究结论将有助于加深对局域共振型加筋板结构的带隙行为和减振降噪特性的认识，为其工程应用提供重要的理论指导和技术支持。

中文关键词： 加筋板；弹性波带隙；减振降噪；周期结构；

英文摘要： Due to high-stiffness and light-weight properties, periodic stiffened plates are widely used in trains, airplanes, submarines, and many other systems. The vibration/noise of stiffened plates always significantly decreases the performance of the relating systems, thus it is very important to investigate the techniques of controlling vibration/noise of stiffened plates. In this project, we introduce the idea of locally resonant phononic crystal into the design of stiffened plates. By mounting periodic arrays of local resonators to stiffened plates, we obtain a new type structures called locally resonant stiffened plates. It is found that by appropriate design locally resonant stiffened plates can exhibit band gaps in which flexural waves in stiffened plates can be significantly attenuated, thus resulting in a reduction of vibration/noise. In this project, we will study the methods for the calculation of band gaps and vibro-acoustic behavior of locally resonant stiffened plates, explore the band gap behavior and formation mechanisms, and examine the performance and mechanisms of vibration/noise reduction. The output of this project will be helpful for the understanding of band-gap behavior and vibration/noise reduction properties of locally resonant stiffened plates, which will facilitate their application in engin

英文关键词： stiffened plate；elastic wave band gap；vibration and noise reduction；periodic structures；