金属橡胶减振器的谱响应研究

发布时间：2018-04-02 22:02

本文选题：金属橡胶　切入点：减振器　出处：《南京航空航天大学》2014年硕士论文

【摘要】：金属橡胶减振器因其优越的性能,在工程的降噪、减振中得到了广泛的应用。由于金属橡胶材料的本构关系复杂,因此前人对其简谐激励响应的研究很多,而随机激励响应的研究比较欠缺。此外,学者们多采用理论方程作为金属橡胶减振器的动力学模型,此类模型计算速度较快,可以系统研究结构的动力学特性,但是难以直观的体现出减振器的结构形式、材料属性、安装方式等特点。而3D有限元模型恰可以弥补这一不足,可以方便的进行减振器的结构设计和分析,及各部分参数的调整,但计算速度较慢。因此,研究金属橡胶减振器的谱响应特性,并综合各模型的特点,探究一种便于工程设计与分析的建模方式,对于工程中减振器的设计具有重要的意义。本文采用经典的迹法模型作为金属橡胶减振器的标准模型,利用等价非线性化法,推导其等价方程,进而研究了迹法模型在高斯白噪声激励下的响应特性。同时,利用数字模拟方法例证了等价非线性化方法的可行性。另外,本文建立了减振器的3D有限元模型,并通过仿真结果与试验结果的对比,验证了3D有限元模型的准确性,在此基础上,探寻了3D有限元模型与迹法模型、复模量模型间的转换关系。最后,本文提出了一种计算金属橡胶减振器3D有限元模型谱响应的方法,利用该方法分析了模型各参数对谱响应的影响情况,得到了工程中可以参考的设计曲。为金属橡胶减振器的设计工作奠定了基础。
[Abstract]:Metal rubber shock absorber has been widely used in engineering noise reduction and vibration reduction because of its superior performance.Due to the complex constitutive relation of metal rubber materials, many researches have been done on the harmonic excitation response of metal rubber materials, but the research on random excitation response is relatively lacking.In addition, many scholars use the theoretical equation as the dynamic model of the metal rubber damper. This kind of model can be used to study the dynamic characteristics of the structure, but it is difficult to directly reflect the structure form of the absorber.Material properties, installation methods and other characteristics.The 3D finite element model can make up for this deficiency, and it can be used to design and analyze the structure of the shock absorber conveniently, and adjust the parameters of each part, but the calculation speed is slow.Therefore, it is of great significance to study the spectral response characteristics of metal rubber shock absorbers and to explore a modeling method which is convenient for engineering design and analysis by synthesizing the characteristics of each model.In this paper, the classical trace method model is used as the standard model of metal rubber shock absorber, the equivalent equation is derived by using the equivalent nonlinear method, and the response characteristics of the trace method model under the excitation of Gao Si white noise are studied.At the same time, the feasibility of the equivalent nonlinear method is illustrated by the digital analog method.In addition, the 3D finite element model of the shock absorber is established, and the accuracy of the 3D finite element model is verified by comparing the simulation results with the experimental results. On this basis, the 3D finite element model and the trace method model are explored.The transformation relationship between the complex modulus models.Finally, a method for calculating the spectral response of the 3D finite element model of the metal rubber damper is presented. The influence of the parameters of the model on the spectral response is analyzed by using this method, and the design curve that can be referenced in the engineering is obtained.It lays a foundation for the design of metal rubber shock absorber.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535

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