Research On Fuzzy Control Of Landing Gear Based On MR Damper

Air travel as a convenient and efficient means of transportation, is more and more integrated into people’s lives, and its safety and comfort get more attention. During landing and taxiing on the runway, the loads of shock and vibration are mainly borne by the landing gear cushioning device which is shock absorber. Now the plane shock absorbers are commonly oil and gas absorber, but the damping force cannot achieve real-time control according to changes in external load, so there are a lot of improvements in its damping effect and control strategies. In response to this situation, this paper carried out the research on semi-active control of landing gear based on magneto-rheological dampers. The research is to reduce vibration and shock during landing and taxing, with application of theoretical analysis and algorithm simulation and experiments of vibration, aircraft landing gear magneto-rheological damper fuzzy control system is designed, the kinetic model of aircraft landing gear system is constructed, and control algorithm design and implementation is completed based on the controller. The main tasks completed are as follows:Firstly, modeling and simulation. On the basis of full investigation and inspection of the related materials, a magneto-rheological dampers designed by the task team is chosen, aircraft landing gear shock absorber system semi-active control and passive control model of second order spring damping model is established, kinetic movement equation is derived, after using MATLAB / SIMULINK simulation model, simulation analysis of the system characteristics and control algorithm is completed, and with the LabVIEW virtual instrument platform for dynamic simulation of signal tracking, kinetics simulation results drawn show that the fuzzy control algorithm is better for shock absorption.Secondly, fuzzy control system program development. On the basis of the controller hardware circuit, the semi-active control principle of the landing gear magneto-rheological damper is analyzed, using TMS320F28335 chip as the main chip of control system, the fuzzy controller hardware composition and function of each part is analyzed, including fuzzy controller, a peripheral circuit, controlled current source and acceleration sensors. Based on CCS4.1 software platform of TI, the control algorithm is designed, control system development process and program development control algorithms of are completed.Thirdly, control algorithm testing and experimentation. The semi-active control experimental test platform is built, using sinusoidal excitation signal, 3 different modescomparative tests are conducted for passive control, I = 0.4A and I = 0.8A steady flow and fuzzy control, LabVIEW virtual instrument monitoring platform is designed, real-time dynamic data change is monitored. Experimental results show that under the regulation of the fuzzy control system, compared to passive control, displacement and acceleration amplitude of magneto-rheological damper has been significantly reduced, dynamic tracking control of external excitation is better.In summary, experimental tests and theoretical analysis show that the fuzzy control system and control algorithms designed have achieved the desired goal and met the test requirements.