| Landing gear is an important supporting device in the process of taking off,landing,parking and taxiing,which occupies a very important position in the aircraft.As a key part of aircraft landing gear,torque arm is directly related to the safety,stability and comfort of aircraft.In order to deeply study the dynamic working characteristics of the landing gear torque arm of an aircraft and improve the buffering and shock absorption effect of the landing gear,the kinematics,dynamics and statics simulation analysis and optimization design of the landing gear torque arm of a simple prop aircraft were studied.The mechanism model of the landing gear torque arm of this type of aircraft is established,and the landing load characteristics of the torque arm are analyzed.By force analysis,the torque load value of the torque arm is calculated as 7000 n.m when the tail of the landing plane of the simple prop aircraft sinks down at two points.Based on the CATIA 3d digital modeling software platform,the 3d digital model of the landing gear torque arm was established by using the real data of the aircraft’s simple strut main landing gear torque arm.Import the multi-body system dynamics software ADAMS,the kinematics and dynamics characteristics of each component is analyzed,the quick-return motion displacement,velocity and acceleration is obtained,the kinetic energy of motion characteristic curve and the key force characteristic curve of motion pair,and test the relationship between the interference between components,verify the rationality of the quick-return motion and power transmission.The 3d model of landing gear torque arm established in CATIA software was imported into ANSYS Workbench,and the static simulation analysis of torque arm was carried out according to the actual working load.According to the simulation data analysis of deformation,stress and strain of each part of the torque arm,the deformation of the contact part between the bottom torque arm and the bottom pin shaft was up to 1.8mm.The maximum stress of the contact part between the upper and lower torsion arms and the pin shaft is506MPa;From the bottom torsional arm to the top torsional arm,the stress increases and the deformation decreases.The web of upper and lower torsional arm has more stress.According to the results of the simulation analysis was carried out on the torque arm structure optimization,to the thickness of the web in order to optimize the design variables,the minimum torque arm total weight and size as the optimization goal,using the optimized parameters to trim torque arm model,repeat the simulation process,the simulation results and comparison: the torque arm quick-return motion characteristics and stress characteristics and stability;The maximum stress area of each member decreases;The maximum stress value of the axial stress concentration decreased by 39%.Total weight of torque arm reduced by 33%;The stiffness,strength and stability of the torque arm meet the general technical requirements of a certain aircraft landing gear. |
