用于直升机主减半主动隔振的液弹隔振器设计

发布时间：2018-03-17 04:02

本文选题：直升机　切入点：主减隔振　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：旋翼的桨毂力是引起直升机机体振动的主要振源。旋翼桨毂力通过旋翼轴、主减速器及其与机身连接装置传递到机身,使机身产生强烈的振动。因此,在直升机主减速器和机体之间进行隔振便成为了一种高效的直升机减振措施。液弹隔振器是一种构造简单、质量轻、占用空间小的高效隔振设备。近年来,国外一些直升机的主减隔振方案越来越多地采用了液弹隔振器。随着对直升机振动水平要求不断地提高,传统的被动式隔振器越来越难完成振动控制目标。隔振效果更好、适应能力更强的半主动隔振已成为了研究热点。本文设计提出了一种能够用于直升机主减半主动隔振的新型液弹隔振器。建立了液弹隔振器的动力学模型及其动力学方程,推导了隔振器的隔振频率公式,分析了影响液弹隔振器隔振频率的参数。在此基础上,选择隔振器的刚度作为受控参数,设计了一种变刚度钢板弹簧。选择一种三环音圈电机作为作动器来改变弹簧片之间的间隙以改变变刚度弹簧的刚度,达到调节隔振器的隔振频率以适应振源频率变化的目的。利用设计的变刚度钢板弹簧,设计了一种变刚度液弹隔振器。还为变刚度液弹隔振器设计了一种变阻尼机构,以改善隔振器的隔振效果。用MSC.ADAMS对变刚度液弹隔振器的工作性能进行动力学仿真,得到了频响结果。仿真结果与计算结果吻合度良好,表明设计的变刚度液弹隔振器能够完成半主动隔振中的任务。最终建立了变刚度液弹隔振器的CATIA装配模型。
[Abstract]:The rotor hub force is the main vibration source of helicopter body. The rotor hub force is transmitted to the fuselage through the rotor shaft, the main reducer and its connecting device to the fuselage, which makes the fuselage produce strong vibration. Vibration isolation between the main reducer and the airframe of the helicopter has become an effective measure for the vibration reduction of the helicopter. The liquid-bomb isolator is an efficient vibration isolation device with simple construction, light weight and small space occupation. More and more hydro-bomb vibration isolators are used in the main vibration isolation schemes of some foreign helicopters. With the increasing demands on the helicopter vibration level, the traditional passive vibration isolators are more and more difficult to achieve the vibration control goal, and the vibration isolation effect is better. Semi-active vibration isolation with stronger adaptability has become a hot topic. In this paper, a new type of liquid-bomb vibration isolator which can be used for helicopter main halving active vibration isolation is proposed. The dynamic model and dynamic equation of liquid-bomb vibration isolator are established. The vibration isolation frequency formula of the vibration isolator is derived, and the parameters affecting the vibration isolation frequency of the liquid bomb vibration isolator are analyzed. On this basis, the stiffness of the isolator is selected as the controlled parameter. A variable stiffness leaf spring is designed. A three-ring coil motor is chosen as actuator to change the gap between the springs to change the stiffness of the variable stiffness spring. In order to adjust the vibration isolation frequency of the vibration isolator to adapt to the change of vibration source frequency, a variable stiffness liquid-bomb vibration isolator is designed by using the designed variable stiffness leaf spring. A variable damping mechanism is also designed for the variable stiffness liquid bomb vibration isolator. In order to improve the isolation effect of the vibration isolator, the dynamic simulation of the working performance of the variable stiffness liquid-bomb isolator is carried out by using MSC.ADAMS, and the frequency response results are obtained. The simulation results are in good agreement with the calculated results. It is shown that the variable stiffness liquid-bomb vibration isolator can accomplish the task of semi-active vibration isolation. Finally, the CATIA assembly model of the variable stiffness liquid-bomb vibration isolator is established.
【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】：2016
【分类号】：V275.1

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