本文選題：粘彈性材料　切入點：約束阻尼　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：航天器搭載的高分辨率有效載荷及其自身指向穩(wěn)定性對航天器的振動控制技術(shù)提出了更高的要求。對于頻率成分較為豐富的擾振，若只為了降低共振峰放大倍數(shù)而提高阻尼系數(shù)，會使得高頻段的振動傳遞率提高，隔振效果變差，，因此需要尋求合適的減振措施。本文以粘彈性材料的約束阻尼型結(jié)構(gòu)為出發(fā)點，研究了粘彈性材料的阻尼原理及阻尼模型；基于ANSYS中的Prony級數(shù)方法，考慮了粘彈性材料的頻變特性，分析了阻尼層的厚度、長度及模量對結(jié)構(gòu)阻尼比的影響；重點研究了約束阻尼型隔振單元在振動控制中的減振性能，主要從以下幾個方面展開研究： 首先根據(jù)約束阻尼結(jié)構(gòu)的剪切變形特點，建立了單元模型和位移函數(shù)，采用復(fù)模量頻變模型，并結(jié)合粘彈性材料的WLF時溫等效方程，理論上實現(xiàn)了粘彈性材料的溫變、頻變特性模擬，并采用QR阻尼法求解了含有粘彈性材料的復(fù)合懸臂梁的復(fù)特征值和阻尼比，與試驗結(jié)果相對比，驗證了本文建模求解方法的可行性。 然后，根據(jù)隔振單元的初始結(jié)構(gòu)，采用控制單一變量的方法，分析了阻尼層的各個參數(shù)對隔振單元阻尼比的影響規(guī)律；并通過對結(jié)果的分析，對其初始結(jié)構(gòu)進(jìn)行修正，確定了隔振單元的具體結(jié)構(gòu)，建立三維模型，為有限元分析和動力學(xué)仿真做準(zhǔn)備。 最后建立了隔振單元的有限元模型和動力學(xué)仿真模型，進(jìn)行了模態(tài)分析，得到其共振頻率和模態(tài)振型，從而能夠預(yù)測其振動耗能方式及能力大�。辉贏DAMS/Vibration模塊中對隔振單元進(jìn)行了X/Y/Z三個軸向方向的隔振性能分析，得到隔振單元對不同大小和方向的振動激勵響應(yīng)曲線和傳遞率，從而直觀反映了隔振單元的主要隔振方向和隔振效果。本文的研究方法精確擬合了粘彈性材料的特性，為高衰減率隔振單元的研制提供了一種更有效的方法。
[Abstract]:The high resolution payload and its own directional stability of spacecraft put forward higher requirements for the vibration control technology of spacecraft.For the disturbance with rich frequency components, if the damping coefficient is increased only to reduce the amplification of the resonance peak, the vibration transmission rate in the high frequency band will be increased, and the isolation effect will become worse. Therefore, it is necessary to find appropriate damping measures.In this paper, the damping principle and damping model of viscoelastic materials are studied based on the constrained damping structure of viscoelastic materials. Based on the Prony series method in ANSYS, the frequency variation characteristics of viscoelastic materials are considered and the thickness of damping layer is analyzed.The effect of length and modulus on damping ratio of structure is studied, and the damping performance of constrained damping isolation unit in vibration control is mainly studied from the following aspects:Firstly, according to the shear deformation characteristics of constrained damping structure, the element model and displacement function are established. The complex modulus frequency variation model is adopted and the WLF time-temperature equivalent equation of viscoelastic material is used to realize the temperature variation of viscoelastic material theoretically.The complex eigenvalues and damping ratios of composite cantilever beams with viscoelastic materials are calculated by QR damping method. Compared with the experimental results, the feasibility of the proposed method is verified.Then, according to the initial structure of the isolation unit, the influence of the damping layer parameters on the damping ratio of the isolation unit is analyzed by using the method of controlling a single variable, and the initial structure is modified by the analysis of the results.The concrete structure of the vibration isolation element is determined and the three-dimensional model is established to prepare for finite element analysis and dynamic simulation.Finally, the finite element model and dynamic simulation model of the vibration isolation element are established, and the modal analysis is carried out, and the resonance frequency and modal mode are obtained, which can predict the energy dissipation mode and the capability of vibration.In the ADAMS/Vibration module, the vibration isolation performance of the three axial directions of X/Y/Z is analyzed, and the vibration excitation response curve and transmission rate of the isolation unit to different sizes and directions are obtained.Thus, the main isolation direction and vibration isolation effect of the isolation unit are intuitively reflected.In this paper, the characteristics of viscoelastic materials are fitted accurately, which provides a more effective method for the development of vibration isolation units with high attenuation rate.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：V414.33;TB535.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 徐趙東,周洲,趙鴻鐵,沈亞鵬;粘彈性阻尼器的計算模型[J];工程力學(xué);2001年06期

2 熊偉,劉耀宗,邱靜,郁殿龍;材料阻尼模型綜述[J];功能材料;2005年10期

3 王曉燕;唐義;唐秋艷;王靜;倪國強;;衛(wèi)星平臺振動對色散型光譜儀光譜成像質(zhì)量的影響分析[J];光譜學(xué)與光譜分析;2011年12期

本文編號：1717109