Research On Aero-engine Six-axis NC Installation Vehicle Driven By Omnidirectional Wheels

The aircraft assembly efficiency has been greatly improved with the application of pulsation production line.However,the efficiency can hardly get further improvement due to the aero-engine installation which is time and labor consuming.The aero-engine is featured by large volume,high weight and precise structure,leading to a great difficulty to realize aero-engine installation efficiently and accurately,especially with a small assembling clearance and complicated track in the process.At present the domestic aero-engine installation mostly relies on manual operation with non-automatic machinery,which is inefficiency and labour-intensive,and easily brings about misoperation and damage to the aero-engine.In this paper,aiming at solving the problems in the aero-engine installation process,a aero-engine six-axis NC installation vehicle driven by omnidirectional wheels is designed,and bending deflection of the bodywork as well as the motion deviation of the vehicle are analyzed.The design requirement of the aero-engine NC installation equipment is presented,and the aero-engine six-axis NC installation vehicle driven by omnidirectional wheels is designed.The six-axis NC attitude adjustment platform can realize fine-turning of the aero-engine in spacial six degrees of freedom with servo control.And the omnidirectional moving chassis which is electrically driven can realize forward motion,lateral motion and rotation.The suspension system provides adaptation to uneven road up to 5° in gradient.The main components are structurally improved to reduce weight,in which process the finite element analysis(FEA)method is applied.The percentage ranges between 10.6% to 32.14% in weight reduction,and some components are improved in stress distribution.The vehicle meets the requirement that its weight kept less than 5 ton after improvement.Theoretical derivation is conducted about the bending deflection of the vehicle's bodywork in the installation process and equation of deflection curve is given.FEA method is applied in the simulation and verification of the curve,and the relative error between theoretical and simulation results is less than 12%,providing a feasible method to compensate the error of the aero-engine attitude due to the deflection in the control system.Analysis is conducted on the motion deviation of the chassis with Mecanum wheels due to the unbalanced load from the aero-engine.Kinematics simulation of the chassis is conducted both on balanced and unbalanced load,and a redress method of the deviation is provided.The method is demonstrated in feasibility through kinematics simulation and provides the foundation to guarantee the accuracy of the aero-engine installation process.This paper provides a equipment design to achieve the efficient and accurate installation of the aero-engine,and the method of deviation correction to guarantee the accuracy in the process.That will be helpful to solve the current difficulties in the aero-engine installation,and also has positive meanings to the technical promotion in domestic aircraft manufacturing industry.