Design And Analysis Of All-electric Aircraft Nose Wheel Steering System

The design of nosewheel steering system has become a key technology of the landing gear as thenose wheel steering systm is the core of the ground handling for modern aircraft. With all walks of lifeput forward higher requirements for the performance of aircraft subsystems in the early1980s,All/More electric aircraft begin to draw the attention of aviation industry. As the hybrid system usedby present aircraft exists the inherent defect which is difficult to overcome, whose maintenanceaccounted for more than50%of the entire aircraft maintenance. It is obvious that the aircraftnosewheel steering system will certainly come to the direction of the all-electric development as aresult of the all electric system having high reliability, high maintainability, low security and operatingcost, and many other advantages.Aiming at the all-electric aircraft nose wheel steering system, based on the basic principles of nosewheel steering system, two sets of nose wheel steering mechanism scheme are preliminary designedfirstly in this paper. After comprehensive comparison and analysis, the scheme of turbine worm geartype is selected as its Reliability and economy are better. Then based the design technique ofmechanotronics, a all electric aircraft nose wheel steering system composed of a nose wheel steeringmechanism of turbine worm and a control servo system of fly-by-wire having both steering andanti-shimmy function is designed to meet the demand for operation control in nose wheel steeringsystem. The nose wheel steering mechanism is optimization designed based on the fuzzy algorithmafterwards. On this basis，the transfer function of control system is obtained. Further more, the fuzzyalgorithm and BP neural network algorithm is applied to the control system to explore its algorithm.Finally, the LMS Imagine.lab softwares is applied to build the simulation model of the wholesteering system, then its main functions and performances under different pattern are optimizationsimulated and analyzed. The research results indicate that the nose wheel steering system isreasonable and validated, can meet the requirements of the general project.According to the investigation of this paper, some valuable experience and conclusion is providedfor the design or analysis of the all electric aircraft nosewheel steering system and lay a foundation forthe further optimization and experimentation. It is of great instructive significance for the design ofcivil aircraft’s landing gear of our country.