高温环境下钢丝网垫减振器的力学特性研究

发布时间：2018-06-13 04:44

本文选题：钢丝网垫 + 减振器　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：钢丝网垫减振器属于金属减振器中的一种，它是具有干摩擦迟滞阻尼特性的非线性减振装置。具有包含摩擦迟滞阻尼在内的较大阻尼，能够在很宽的频带内减振；它还具有软化刚度，在意外的大激励下，元件的刚度软化，可使结构的固有频率改变，从而使共振难以发生。钢丝网垫减振器还有其他的一些突出优点，包括能承受大载荷，，抗冲击能力强；可以在复杂、恶劣的工作环境中使用，具有抗高温、抗低温、抗油污、抗腐蚀、耐老化、易于维护、可靠性高等优点。这种减振器在航空航天中得到了较广泛的应用，国内外对它的研究也越来越多。到目前为止，对于钢丝网垫减振器的力学特性分析虽然取得了一定的成果，但是大都是在常温进行的试验研究，只有较少文献考察了金属减振器在高低温条件下的力学特性变化情况，即便如此也只是较少的考虑其力学特性与温度、频率等物理量的相互关系，当然也就无法全面考虑温度对于钢丝网垫减振特性的影响。本文的主要研究目的就是通过多种高温试验，研究并分析了钢丝网垫的力学特性，最高温度达到了500°。其中包括研究了温度对其低频瞬态刚度的影响趋势，以及不同温度条件下，钢丝网垫减振器整体减振特性的变化情况。为今后这类减振器在高温工作环境的设计提供试验依据。同时本文采用粘弹性本构关系模型来近似描述钢丝网垫减振器的动力学特性，并以高温下实测响应为基础识别出高温下钢丝网垫的参数。即通过试验识别出相应的材料参数并应用于有限元建模。最后比对试验与仿真数据，结果表明在300°以下试验结果与理论结果吻合良好，300°以上有一定的误差，且此时误差随温度升高而变大。最终说明本文采用的粘弹性本构模型还是能较好地反映高温下钢丝网垫的动力学特性。
[Abstract]:Wire mesh cushion damper is a kind of metal shock absorber. It is a nonlinear damping device with dry friction hysteresis damping. It has a large damping, including friction hysteresis damping, which can reduce vibration in a wide frequency band. It also has softened stiffness, which softens the stiffness of the element under unexpected large excitation, which can change the natural frequency of the structure. Thus, resonance is difficult to occur. The wire mesh cushion absorber also has some other outstanding advantages, including its ability to withstand large loads and strong impact resistance; it can be used in complex and harsh working environments. It has high temperature resistance, low temperature resistance, oil pollution resistance, corrosion resistance and aging resistance. Easy to maintain, high reliability and other advantages. This kind of shock absorber has been widely used in aeronautics and spaceflight, and more researches have been done on it at home and abroad. So far, although some achievements have been made in the analysis of the mechanical properties of the steel wire mesh cushion absorber, most of the experiments have been carried out at room temperature. Only a few literatures have examined the variation of mechanical properties of metal shock absorbers under high and low temperature conditions. Even so, the relationship between mechanical properties and physical quantities such as temperature, frequency, etc. Of course, it is impossible to fully consider the effect of temperature on the damping characteristics of wire mesh cushion. The main purpose of this paper is to study and analyze the mechanical properties of the wire mesh cushion through various high temperature tests. The maximum temperature is 500 掳. The influence of temperature on the low frequency transient stiffness and the variation of the overall vibration absorption characteristics of the steel wire mesh cushion absorber under different temperature conditions are studied. It provides experimental basis for the design of this kind of shock absorber in high temperature working environment in the future. At the same time, the viscoelastic constitutive relation model is used to approximate describe the dynamic characteristics of the steel wire mesh cushion shock absorber, and based on the measured response at high temperature, the parameters of the steel wire mesh cushion are identified. The corresponding material parameters are identified by experiments and applied to finite element modeling. Finally, comparing the experimental data with the simulation data, the results show that the experimental results below 300 掳are in good agreement with the theoretical results above 300 掳, and the error increases with the increase of temperature. Finally, it is shown that the viscoelastic constitutive model can well reflect the dynamic characteristics of wire mesh cushion at high temperature.
【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】：TB535.1

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