Simulation And Optimization Of Landing Gear Drop Property For A Large Amphibian Aircraft

The buffer performance of landing gears has main impact on the takeoff and landingdynamics for large amphibious aircraft. Improving the capacity of landing gear, extending the life,increasing ground handing safety and comfort are all of great significance by studying the bufferperformance and optimization of the amphibious’ landing gear. The main contents of thisdissertation are summarized as below:1．Status and trends of domestic and foreign research and development of amphibiousaircraft are introduced, review the shock performance analysis for different types of domestic andforeign aircrafts’ landing gear, and clarify the importance of effective buffer system fordevelopment of large amphibious aircraft.2. The scientific definition of the system and the system’s mathematical model are described,two basic methods for numerical integration--the Euler method and Runge-Kutta method areexplained, the steps of system simulation is illustrated, and the development of modern simulationtechniques are summarized.3. The buffer system and mechanical model are established, the system’s landingmechanical model is established through detailed analyzing the tire and buffer of, and equations ofmotions are derived4. The MATLAB/Simulink platform is used to simulate the performance of its buffer, andthe computational model is validated by comparing to the existing design parameters. Set the areaof orifice as design variables, the performances of a large amphibian’s main landing gear’s bufferwith fixed and variable area of orifice design are analyzed and optimized respectively.Optimization results show that the design requirements of the buffer performance have been metby using the method for variable area of orifice designed in this article.