【作者】 王莹；

【导师】 孙辉；

【作者基本信息】 哈尔滨工程大学 ， 声学， 2012， 硕士

【摘要】 近年来，航空、航海及航天等现代技术正在高速地发展，但随其发展的过程中所带来的振动、噪声严重地影响了人们的工作和生活，危害到了人们的身体健康，无论是在军事还是民事领域，减小振动、降低噪声对现代工程的设计都有着极为重要的意义。而作为减振降噪材料之一的阻尼材料也越来越受到大家的关注，阻尼材料声学参数是设计减振降噪结构计算其减振降噪效果的依据；因而，对阻尼材料声学参数测量方法的研究也就更为紧迫。目前，国内外对阻尼材料声学参数的测量方法有很多，但针对低杨氏模量阻尼材料声学参数的测量方法还不是很完善。本文的主要内容就是开展低杨氏模量阻尼材料声学参数测量方法研究并构成相应的测量系统。论文以细棒的弯曲振动理论为基础，研究由钢梁与阻尼材料构成的复合梁的弯曲振动，推出复合梁声学参数与其弯曲振动振幅分布的关系式；将实验得到的复合梁振幅分布测量数值通过理论关系式的曲线拟合，获得复合梁声学参数以及阻尼材料的声学参数。通过理论模型和仿真计算，研究了幅值分布曲线拟合法的测量误差。并用共振法这种非常成熟的声学参数测量方法对幅值分布曲线拟合法所得结果进行验证。结果发现，幅值分布曲线拟合法与共振法测量结果基本吻合，可用于低杨氏模量阻尼材料声学参数的测量。实验数据的分析确定了该方法对于阻尼材料声学参数测量的适用性。更多还原

【Abstract】 Presently, modern high-technology has been developed rapidly, like aviation, navigationand spaceflight etc. But in this progress, noise has become one of the most severe pollutionsin our society. Therefore, reducing noise become important to modern projects, no matter forcivilian or army. As a member of material for noise reducing, macromolecule dampingmaterial has attracted more and more attention and the research of acoustic parametersbecome the most pressing problem.A lot of measurement methods for acoustic parameters of damp material exist, but it isfaulty to measure the acoustic parameters of damp material with low Young’s modulus. Theprimary content of this article is the research of measurement system and methods foracoustic parameters of damping material with low Young’s modulus. Based on the theory ofcurving vibration of rods, the curving vibration of beams composed with still beams anddamping materials is researched, the relationship between the amplitude distribution andacoustic parameters of the composite beam curving vibration is deduced. Then, obtainacoustic parameters of the composite beam and damping material by fitting the curve of thetheory relationship with the measured amplitude distribution. The measurement error of theamplitude distribution curve fitting method is researched by theory model and emulationcalculation. The adaptability of this method is testified by sympathetic vibration method. Bythe experiment date analysis, it is found that the acoustic parameters inversion by amplitudedistribution curve fitting method accord with the measured date by sympathetic vibrationmethod and this method can be used to measure the acoustic parameters of damp materialwith low Young’s modulus.更多还原