新型双出杆活塞式磁流变减摆器结构设计及性能研究

Structural Design and Performance Research of New Type Double-rod Piston Magnetorheological Shimmy Damper

被动油液式减摆器对摆振激励的改变不能实时响应,传统磁流变(Magnetorheological,MR)减摆器存在引线复杂、不利于散热、输出阻尼力较低等方面的不足。针对上述问题,为了有效抑制飞机前轮摆振,提出一种新型压差式结构的双出杆活塞式MR减摆器,内置固定双线圈,内筒两端与磁芯和导磁环形成对称双阻尼通道;根据减摆需求完成结构设计,利用ANSYS/Emag 2020 R1对MR减摆器进行磁场仿真,仿真结果验证理论分析的合理性;最后进行力学性能分析。结果表明:设计的MR减摆器输出阻尼力满足减摆需求,动力可调系数较大,示功曲线近似于椭圆。所采用的研究思路对今后飞机起落架MR减摆器的研发具有一定指导意义。

Passive oil-type shimmy dampers cannot respond to the change of shimmy excitation in real time.Traditional magnetorheological(MR)shimmy dampers have shortages such as complicated lead wires,unfavorable heat dissipation and low output damping force.For the above problems,a new differential pressure structure type of double-rod piston MR shimmy damper,applicable to suppress the shimmy of the nose wheel of the aircraft,was presented.It has the fixed double coils,and the two ends of the inner cylinder forming a symmetrical double damping channels with a magnetic core and a magnetic guide ring.According to the requirements of shimmy reduction,the structure design was completed,and the ANSYS/Emag 2020 R1 was used to simulate the magnetic field of the MR damper,which verified the rationality of the theoretical analysis.Finally,the mechanical properties were analyzed.The results show that the output damping force of the designed MR shimmy damper meets the demand of damping,the dynamic adjustable coefficient is large,and the indicator curve is approximate to ellipse.The design idea adopted in this paper has certain guiding significance for the future research of MR shimmy damper of the aircraft landing gear.