Structural Design And Optimization Of Landing Gear Of New Type Large Airliner

Large-type passenger plane is the first field for China’s aviation industry to enter into,and although it is supported by relevant design theories,it has never had practical design experience.the research object of this paper is to design a suitable for large aircraft landing gear structure,to put a motion simulation,using the finite element software,the design of the gear structure finite element simulation,and based on the finite element simulation analysis result,the main landing gear buffer pillar,connecting bar,lightweight optimization:(1)According to the classical landing gear design method,first determine the basic layout of landing gear,calculate the aircraft load,and then calculate the size of tires and buffers in the landing gear buffer system according to the distribution of aircraft load.The three-dimensional models of the nose landing gear and main landing gear parts were established in CATIA by calculating the structural dimension parameters,and then assembled into the nose landing gear and main landing gear structures.The joints were added in the motion simulation module for retracting and retracting motion simulation to check whether there were motion interference and restrictions.(2)The three-dimensional model into ANSYS Workbench in CATIA to establish finite element model and mesh,according to the characteristics of statics,dynamics modal and random vibration theory,finite element analysis was carried out on the landing gear structure,the landing gear of the structure of the static deformation,stress,strain and top 20 order modal frequency and random vibration parameters such as deformation,stress,and pointed out the direction for the landing gear structural optimization design.(3)based on response surface model and genetic algorithm of the multi-objective optimization theory,the stress,strain and deformation are the main landing gear parts of small size parameters added to the central composite design experiments,have certain data at the end of the central composite design experiments,according to the sensitivity of the response surface model diagram,select the response variables affect the size of the largest as the main direction of optimization,and uses the multi-objective genetic algorithm for optimal size of the values,replacing the original model,finite element analysis again.The final optimization results show that the overall structural performance of the main landing gear is improved while the overall structural mass of the main landing gear is reduced by 7.1%.