Research On Control Method Of Aircraft Landing Gear Based On Magnetorheological Damper

Landing is one of the most critical operational phases of the aircraft,which directly affects passenger safety and comfort.When the plane landed,the large amplitude of the vibration from the runway to the fuselage,so the need for rapid suppression.The landing gear shock absorber is an essential component that prevents the aircraft fuselage from being subjected to ground impact loads,which play an important role by absorbing vibrations during landing.Magnetorheological(MR)damper is able to solve the problem of excessive vibration according to the semi-active control system command to provide the required continuous variable damping,which has good performance and control effect,as the landing gear shock absorber Ideal for components.In this paper,by using the semi-active aircraft landing gear system using the MR damper,the linear quadratic regulator(LQR)control and the robust ∞ control method are used to provide the MR damper according to the actual needs during the landing phase.Control the output damping force to suppress the vibration transmitted to the fuselage,to protect the safety of the aircraft and improve the ride comfort of passengers.Firstly,the dynamic characteristics of the MR damper are studied by parametric modeling method.The dynamic characteristics of the MR damper are simulated by Spencer and Sigmoid models.The exact model is obtained by calculating the parameters and calculating the characteristics of the simulation results.Among the best performers for further use.Secondly,the damping coefficient of the magnetorheological damper is linearized by equivalent viscous damping,and the energy dissipation analysis of the MR damper is carried out based on the Spencer model.The force-displacement characteristics are obtained and analyzed under different frequencies and currents MR dampers,and the relationship between the equivalent viscous damping coefficient and the current and frequency is analyzed.Thirdly,according to the system model of the three-degree-of-freedom aircraft landing gear system,the system of semi-active landing gear system is obtained.Based on the established system model and design requirements,a robust ∞ and linear quadratic regulator(LQR)controller are designed to act on the MR damper of the landing gear.Finally,the performance of the MRF semi-active shock absorber is analyzed,and the simulation results of the two controllers are analyzed and simulated.The robust ∞ control method is implemented to simulate the landing gear Semi-active system under different landing conditions,the applicability of semi-active control to landing gear system control is verified.