Design And Analysis Of Dual Actuator Nose Wheel Steering System For Large Civil Aircraft

As we know, the nosewheel steering is a main manner of aircraft ground steering, its executive device—the system of nosewheel steering is an important part of the landing gear. With the rapid development of large aircraft in our country, it is advisable to launch the design and application work of the nosewheel steering system with two actuacors which can sastify the civil aircraft's demand ensuring it can turn with large steering angle and turning moment, which can contribute to increase our country's marketability of large aircraft with proprietary intellectual property rights and is of great significance for the success of our country's large civil aircraft.The system of nosewheel steering consists of the nose wheel steering mechanism and the electro-hydraulic servo control system. Multi-objective optimization is used to design the parameter of the nosewheel steering system with two actuacors, basing on that the structural design of nose wheel steering mechanism is finished. Accoeding to the results of design, the LMS Virtual.lab Motion software is applied to build the dynamical model of mechanism, then the simulation study and analysis of the dynamic performance of rolling and steering are carried on. Later, basing on the detailed analysis of the mature technology in electro-hydraulic servo control system abroad, and the LMS Imagine.lab AMESim software is applied to build the model of the electro-hydraulic servo control system of the nosewheel steering system with two actuacors, its main functions are proved and performance are simulated and analyzed.At last, the Virtual.lab and Imagine.lab softwares are applied to build the joint simulation model of the nose wheel steering mechanism and electro-hydraulic servo control system, then its main functions and performances under different pattern are simulated and analyzed. The results show that the primary simunation of the mechanic-electronic-hydraulic integrated nosewheel steering system is achieved. Through simulation and analysis, the correctness and reasonalbeness of the design of the nosewheel steering system with two actuacors are proved, besides, some valuable design experience and conclution are achieves, which can lay a good foundation for further detailed design and tests. It is of great instructive significance for the design of nosewheel steering system.