Development Of Aircraft Nose Wheel Shimmy Simulation Platform Based On Magnetorheological Damper

The shimmy of the aircraft will occur during the taxiing process,which will cause the flight accident when it is serious.Adding Shimmy damper can effectively reduce the Shimmy of aircraft.At present,the oil-type damper is widely used in aircraft,but it can't output the proper damping force according to the actual situation.The magnetorheological damper with semi-active control can output real-time controllable damping force according to the actual situation,and the problems of over-damping and insufficient damping force can be well solved.It has a good application prospect in aircraft landing gear.In this paper,aiming at the magnetorheological damper,the design flow of the damper is standardized by developing the Shimmy simulation platform of the magnetorheological damper,and the simulation platform is developed from three aspects: initial structure size calculation,magnetic field performance analysis and shimmy simulation analysis.According to the design flow of magnetorheological damper,the system of the simulation platform is analyzed.The platform consists of four functional modules: theoretical design Module,parametric modeling module,magnetic field simulation module and shimmy simulation module.(1)Analyze the functional relationship of the structural parameters of the damper,and establish the size driving model of the damper part in conjunction with CATIA to realize the initial design,three-dimensional modeling,and engineering drawing of the magnetorheological damper.(2)According to the magnetic field analysis flow of the magnetorheological damper,the secondary development method of ANSYS is used to establish a magnetic field analysis model to realize the simulation analysis of the magnetic field of the magnetorheological damper with different structural size values.And the effect of length L and damping channel gap h on the magnetic field distribution of the magnetorheological deflector are analyzed.(3)The function relationship between the energized current I and the damping output force F of the magnetorheological damper is obtained by fitting.And then combining the tire shimmy equation,the tire shimmy simulation model based on the damper is established.After summarizing and classifying the influencing factors that affect the shimmy,the mixed programming method of VB and MATLAB is used to complete the development of the Shimmy simulation function module.Finally,a simulation platform based on Visual Basic 6.0 is established.Design friendly human-computer interaction functions to achieve effective calls and data interaction with back-end models.Input the parameters according to the design requirements,and call the background model for calculation,and the calculation results are displayed on the human-computer interaction function interface,thereby completing the design analysis of the magnetorheological damper.The results show that the simulation platform can complete the structural design,magnetic circuit simulation,shimmy simulation and model drawing of the damper conveniently and quickly.To a certain extent,it is of engineering significance to shorten the development cycle of the magnetorheological damper and reduce the development cost.