Study Of Landing Gear Damper Optimal Control On The Principle Of MR

Magnetorheological fluid damper has many advantages such as simple structure, fast transient response, low energy consumption, high reliability and widely adjustable damping force. It has been found effective in vehicle shock system, windbreak and antiquake building, offshore platform damping, etc. It also has a bright application future when used in aircraft landing gear damping system. Issues such as controller design, taxiing simulation and shaking table experiment verification when MR fluid damper is used in landing gear damping system is discussed and researched in this paper.This author firstly analyzes mechanical property and damping force formula of the landing gear MR damper; and then on the classical theory of optimal control and combining theoretical analysis, it designs an optimal control algorithm, of which the current is continuously and real-timely adjustable. The algorithm can effectively control the damper by the real-time damping force produced through adjusting the current of the MR damper coil and then the magnetic field of the MR damper.Then, in order to simulate the dynamic response of the landing gear damper during taxiing, this author uses different runway model to compare the displacement and acceleration response of the damper under passive control and optimal control by MATLAB. The simulation results indicate that compared with the passive control not electrified, the optimal control algorithm can give full play to the MR damper's advantage of adjustable damping force, and can effectively restrain the displacement and velocity of the structure.Finally, this author compiles optimal control program with C++ language on the industrial control computer. Under different external conditions, damper simulation taxiing experiment research is conducted on the electro-hydraulic shaking table to compare passive control and optimal control. The experiment also indicates that compared with passive control, the optimal control algorithm based on MR damper is more effective and can obviously restrain the displacement and acceleration response of the structure. When used in landing gear damping system, this damper can greatly improve the safety and comfort of the aircraft.