集中或离散频振源所致砼承板结构振动与噪声治理研究

发布时间：2018-12-31 10:34

【摘要】：现代城市建筑中诸多因功能需求或追求使用环境优越,愈来愈多地配置了不同种类的动力机器与设备,诸如风机、空调、水泵、配电设施等。这些设施大多具有集中或离散频率激振源特点,运行时不仅本身产生环境振动和噪声,同时会通过传播造成一定相邻区域范围内建筑结构的环境振动,甚至产生二次结构声辐射现象。目前,这类环境振动和噪声的治理研究与技术应用已得到普遍关注和重视。本文的主要工作内容如下:(1)对建筑内的一类集中或离散频振源进行了测试分析的基础上,通过得到的频谱图,分析它们的典型振动频率,总结它们的频谱图规律。同时,在对振动机理进行研究的基础上,研究它们的振动噪声传播规律。(2)对不同边界条件下的板进行振动特性分析,针对四边简支和四边固支两种情况,分别采用不同的方法来进行声辐射特性研究,对于四边简支板,由于板的振动响应有精确的解析解,所以拟采用MATLAB编程的方法直接根据辐射声功率公式进行求解,对于四边固支的情况,则采用先在ANSYS里面计算振动响应之后,再利用声学计算软件VL Acoustic进行声辐射的计算,并研究了板的不同结构参数对声辐射的影响。(3)通过对单双层隔振系统的理论分析之后,选择运用隔振效果更好的双层隔振的方式来治理振动噪声,建立了双层隔振的简化模型,讨论了双层隔振系统力传递率的几个影响因素,同时,基于MATLAB GUI可视化编程,建立了方便观察双层隔振隔振效果的窗口。通过一款双层隔振装置的设计,实验验证其隔振效果在理想范围内;对一款适用性更广的中间质量为混凝土平台的双层隔振系统进行仿真模拟计算,结果表明,通过双层隔振之后,板的辐射声功率有明显的降低。
[Abstract]:Many modern urban buildings are equipped with different kinds of power machines and equipments, such as fans, air conditioners, water pumps, distribution facilities and so on. Most of these facilities have the characteristics of concentrated or discrete frequency excitation sources. When running, they not only produce environmental vibration and noise, but also cause environmental vibration of building structures in a certain adjacent area through propagation. It even produces the phenomenon of secondary structure sound radiation. At present, the research and application of this kind of environmental vibration and noise treatment have been paid more and more attention. The main work of this paper is as follows: (1) on the basis of testing and analyzing a class of concentrated or discrete frequency vibration sources in buildings, the typical vibration frequencies are analyzed and their laws are summarized. At the same time, based on the study of vibration mechanism, the propagation law of vibration and noise is studied. (2) the vibration characteristics of plates under different boundary conditions are analyzed. Different methods are used to study the acoustic radiation characteristics. For the simply supported plates with four sides, because of the exact analytical solution of the vibration response of the plates, the method of MATLAB programming is proposed to solve the problem directly according to the formula of radiated acoustic power. In the case of quadripartite clamping, the acoustic radiation is calculated by using the acoustic calculation software VL Acoustic after the vibration response is calculated in the ANSYS. The effects of different structural parameters of plate on acoustic radiation are studied. (3) after theoretical analysis of single and double layer vibration isolation system, the vibration noise is treated by using double layer vibration isolation method with better vibration isolation effect. A simplified model of double-layer vibration isolation is established, and several factors influencing the force transfer rate of double-layer vibration isolation system are discussed. At the same time, based on the visual programming of MATLAB GUI, a window is established to observe the effect of double-layer vibration isolation. Through the design of a double-layer vibration isolation device, the experimental results show that the vibration isolation effect is in the ideal range. The simulation and calculation of a two-layer vibration isolation system with a more widely used intermediate mass of concrete platform shows that the radiated sound power of the plate decreases obviously after the double-layer vibration isolation.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB535.1

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