本文選題：鋼絲網(wǎng)墊 + 減振器　； 參考：《南京航空航天大學》2014年碩士論文

【摘要】：鋼絲網(wǎng)墊減振器屬于金屬減振器中的一種，它是具有干摩擦遲滯阻尼特性的非線性減振裝置。具有包含摩擦遲滯阻尼在內(nèi)的較大阻尼，能夠在很寬的頻帶內(nèi)減振；它還具有軟化剛度，在意外的大激勵下，元件的剛度軟化，可使結(jié)構(gòu)的固有頻率改變，從而使共振難以發(fā)生。鋼絲網(wǎng)墊減振器還有其他的一些突出優(yōu)點，包括能承受大載荷，，抗沖擊能力強；可以在復雜、惡劣的工作環(huán)境中使用，具有抗高溫、抗低溫、抗油污、抗腐蝕、耐老化、易于維護、可靠性高等優(yōu)點。這種減振器在航空航天中得到了較廣泛的應用，國內(nèi)外對它的研究也越來越多。 到目前為止，對于鋼絲網(wǎng)墊減振器的力學特性分析雖然取得了一定的成果，但是大都是在常溫進行的試驗研究，只有較少文獻考察了金屬減振器在高低溫條件下的力學特性變化情況，即便如此也只是較少的考慮其力學特性與溫度、頻率等物理量的相互關(guān)系，當然也就無法全面考慮溫度對于鋼絲網(wǎng)墊減振特性的影響。本文的主要研究目的就是通過多種高溫試驗，研究并分析了鋼絲網(wǎng)墊的力學特性，最高溫度達到了500°。其中包括研究了溫度對其低頻瞬態(tài)剛度的影響趨勢，以及不同溫度條件下，鋼絲網(wǎng)墊減振器整體減振特性的變化情況。為今后這類減振器在高溫工作環(huán)境的設計提供試驗依據(jù)。 同時本文采用粘彈性本構(gòu)關(guān)系模型來近似描述鋼絲網(wǎng)墊減振器的動力學特性，并以高溫下實測響應為基礎識別出高溫下鋼絲網(wǎng)墊的參數(shù)。即通過試驗識別出相應的材料參數(shù)并應用于有限元建模。最后比對試驗與仿真數(shù)據(jù)，結(jié)果表明在300°以下試驗結(jié)果與理論結(jié)果吻合良好，300°以上有一定的誤差，且此時誤差隨溫度升高而變大。最終說明本文采用的粘彈性本構(gòu)模型還是能較好地反映高溫下鋼絲網(wǎng)墊的動力學特性。
[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 擄. 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 擄are in good agreement with the theoretical results above 300 擄, 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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB535.1

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