声子晶体组合杆及减振平台的振动特性研究

发布时间：2018-07-01 11:47

本文选题：声子晶体 + 组合杆　；参考：《哈尔滨工程大学》2014年硕士论文

【摘要】：随着我国科技和国防工业的飞速发展,人们对减振降噪技术的需求日益迫切,如何解决现代工程技术中普遍存在的机械振动问题成为工程领域研究的热点问题之一。声子晶体在其内部周期机制的作用下,可以抑制一定频带范围内的弹性波的传播,具有“天然”的减振降噪特性。将声子晶体思想引入到各类杆件及由其组成的并联平台的设计中,利用其带隙特性对结构振动进行控制,为解决振动问题提供了一种新思路,具有重要的工程应用价值。本文在声子晶体理论的基础上,将理论分析和仿真验证相结合,对元件级和部件级的声子晶体组合杆及其并联平台的振动特性进行了深入的分析和研究,并利用遗传算法对影响元部件级声子晶体组合杆带隙特性的因素进行了优化设计。论文的主要研究内容如下:1.采用传递矩阵法,对声子晶体平面组合杆、空间组合杆及并联平台的振动特性,分别进行理论推导和数值分析。2.对声子晶体组合杆和减振平台进行有限元仿真分析,并与理论分析结果进行对比。在此基础上,进一步研究各关键影响因素对振动特性的影响,以获得参数影响规律。3.将遗传算法引入声子晶体振动特性反问题的研究。对影响声子晶体平面和空间组合杆带隙特性的各关键参数进行了优化设计。研究表明,由于声子晶体固有的带隙特性以及组合杆在结合处发生的波形转换效应,声子晶体平面组合杆、空间组合杆及由其组成的减振平台具有多维宽频减振能力,是十分良好的工程减振元件或部件,这对于推动声子晶体在工程应用领域的发展具有重要的实际意义。
[Abstract]:With the rapid development of science and technology and national defense industry in China, the demand for vibration and noise reduction technology is becoming more and more urgent. How to solve the problem of mechanical vibration, which is widely existing in modern engineering technology, has become one of the hot issues in the field of engineering. Under the action of its internal periodic mechanism, phononic crystals can suppress the propagation of elastic waves in a certain frequency band, and have the characteristics of "natural" vibration and noise reduction. The idea of phonon crystal is introduced into the design of various kinds of bars and parallel platform, and the vibration of the structure is controlled by its band gap characteristic, which provides a new way to solve the vibration problem and has important engineering application value. Based on the theory of phonon crystal, the vibration characteristics of the component and component level phonon crystal composite rod and its parallel platform are analyzed and studied by combining the theoretical analysis and simulation. The factors affecting the band gap characteristics of component level phonon crystal combination rod are optimized by genetic algorithm. The main contents of this thesis are as follows: 1. By using the transfer matrix method, the vibration characteristics of the planar composite rod, the spatial composite rod and the parallel platform of phononic crystal are derived theoretically and numerically respectively. The finite element simulation analysis of phonon crystal combination rod and damping platform is carried out, and the results are compared with the theoretical analysis. On this basis, the influence of the key factors on the vibration characteristics is further studied in order to obtain the influence law of parameters. 3. Genetic algorithm is introduced into the inverse problem of phonon crystal vibration characteristics. The key parameters affecting the band gap characteristics of planar and spatial combination rods of phononic crystals are optimized. The results show that, due to the inherent band gap characteristics of phononic crystals and the waveform conversion effect of the combination rod at the joint, the planar composite rod, the spatial composite rod and the damping platform of the phonon crystal have multi-dimensional broadband vibration absorption capability. It is of great practical significance to promote the development of phononic crystals in engineering applications.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535

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