本文選題：DAVI + 結(jié)構(gòu)優(yōu)化��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：在航空領(lǐng)域,直升機的振動問題一直是非常突出的。從直升機發(fā)展的初期,人們就開始使用各種減振隔振方法。但是振動問題不僅沒有隨著直升機技術(shù)的不斷發(fā)展而得到很好的解決,而且愈發(fā)迫在眉睫。以往的減振技術(shù)存在著隔振效率低、機構(gòu)所占空間大、質(zhì)量偏大、效果不穩(wěn)定等各種問題。因此研究設(shè)計性能更優(yōu)的隔振吸振器具有重要的工程意義。文章主要研究了一種基于動力反共振隔振系統(tǒng)(Dynamic Anti-Vibration Isolator,DAVI)原理的新型半主動DAVI減振系統(tǒng)。首先,將動力反共振隔振和聚焦式隔振的原理相結(jié)合,建立出一種聚焦式DAVI的模型,并且根據(jù)這樣的理論基礎(chǔ)建立起基本模型的有限元模型驗證這種理論方法的可行性。繼而通過Isight和Patran/Nastran以及Matlab對其中質(zhì)量塊的質(zhì)量這一設(shè)計變量進行優(yōu)化設(shè)計使得隔振器在20Hz激勵下的響應(yīng)力傳遞率最低,并且對優(yōu)化設(shè)計結(jié)果做了機械設(shè)計。然后根據(jù)最初的有限元模型建立運動系統(tǒng)的理論模型。在優(yōu)化之后有限元分析的力傳遞率能降低到5%以下,但是在載荷頻率變化之后就很難保證有良好的隔振效果,考慮到隔振系統(tǒng)可以通過調(diào)節(jié)集中質(zhì)量塊的位置來調(diào)節(jié)對不同頻率下激勵的相應(yīng),則在隔振系統(tǒng)的基礎(chǔ)上加入控制,使得隔振系統(tǒng)能在不同的頻率下依舊保持其較好的隔振效率。利用Matlab仿真隔振系統(tǒng)在不同條件下的隔振效果顯示,在加入控制系統(tǒng)之后保證力的傳遞率在30%以下。文章使用理論研究、有限元仿真計算和控制仿真計算的方法,設(shè)計了能應(yīng)用于直升機旋翼隔振的半主動DAVI隔振系統(tǒng),并且驗證了有效性,達到了文章研究目的。
[Abstract]:In the aviation field, the helicopter vibration problem has been very prominent. From the early stage of helicopter development, people began to use a variety of vibration isolation methods. But the vibration problem is not only not solved well with the development of helicopter technology, but also becomes more and more urgent. In the past, there are many problems such as low vibration isolation efficiency, large space occupied by mechanism, large mass, unstable effect and so on. Therefore, it is of great engineering significance to study and design vibration isolation and vibration absorber with better performance. In this paper, a new semi-active Anti-Vibration damping system based on the principle of dynamic Anti-Vibration isolation system is studied. Firstly, combining the principle of dynamic antiresonance vibration isolation and focusing vibration isolation, a focused DAVI model is established, and the finite element model of the basic model is established to verify the feasibility of this method. Then, the mass of mass block is optimized by Isight, Patran/Nastran and Matlab. The response force transfer rate of the isolator under 20Hz excitation is the lowest, and the optimized design result is designed mechanically. Then the theoretical model of motion system is established according to the initial finite element model. After optimization, the force transfer rate of finite element analysis can be reduced to less than 5%, but it is difficult to ensure a good vibration isolation effect after the change of load frequency. Considering that the vibration isolation system can adjust the corresponding excitation at different frequencies by adjusting the position of the lumped mass block, the control is added to the vibration isolation system. The vibration isolation system can still maintain its better isolation efficiency at different frequencies. Using Matlab to simulate the isolation effect of the vibration isolation system under different conditions, it is shown that the transfer rate of the guaranteed force is less than 30% after adding the control system. The semi-active DAVI vibration isolation system which can be applied to helicopter rotor vibration isolation is designed by using the methods of theoretical research, finite element simulation and control simulation calculation. The validity of the system is verified and the purpose of this paper is achieved.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：V275.1;TB535.1

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本文編號：1781406