直升机主旋翼半主动DAVI隔振系统设计

发布时间：2018-04-21 07:05

本文选题：DAVI + 结构优化　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：在航空领域,直升机的振动问题一直是非常突出的。从直升机发展的初期,人们就开始使用各种减振隔振方法。但是振动问题不仅没有随着直升机技术的不断发展而得到很好的解决,而且愈发迫在眉睫。以往的减振技术存在着隔振效率低、机构所占空间大、质量偏大、效果不稳定等各种问题。因此研究设计性能更优的隔振吸振器具有重要的工程意义。文章主要研究了一种基于动力反共振隔振系统(Dynamic Anti-Vibration Isolator,DAVI)原理的新型半主动DAVI减振系统。首先,将动力反共振隔振和聚焦式隔振的原理相结合,建立出一种聚焦式DAVI的模型,并且根据这样的理论基础建立起基本模型的有限元模型验证这种理论方法的可行性。继而通过Isight和Patran/Nastran以及Matlab对其中质量块的质量这一设计变量进行优化设计使得隔振器在20Hz激励下的响应力传递率最低,并且对优化设计结果做了机械设计。然后根据最初的有限元模型建立运动系统的理论模型。在优化之后有限元分析的力传递率能降低到5%以下,但是在载荷频率变化之后就很难保证有良好的隔振效果,考虑到隔振系统可以通过调节集中质量块的位置来调节对不同频率下激励的相应,则在隔振系统的基础上加入控制,使得隔振系统能在不同的频率下依旧保持其较好的隔振效率。利用Matlab仿真隔振系统在不同条件下的隔振效果显示,在加入控制系统之后保证力的传递率在30%以下。文章使用理论研究、有限元仿真计算和控制仿真计算的方法,设计了能应用于直升机旋翼隔振的半主动DAVI隔振系统,并且验证了有效性,达到了文章研究目的。
[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.
【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】：V275.1;TB535.1

【参考文献】