Research On NC Installation Vehicle For Aero-engine

As the core power component of aircraft, aero-engine installation work is a top priority of aircraft assembly, but such difficulties like large size, high quality, complex structure and narrow installing gap make the traditional manual installation mode difficult to achieve high efficiency and quality, lacking of effective installation measures and existing a big distance from foreign advanced digital installation technology.Based on the existing study of aero-engine installation process, a NC (numerical control) installation method for aero-engine is proposed combing with image recognition measurement technology and digital control technology:on the one hand develop monitoring platform of aero-engine installation, measuringing the location data of aero-engine installation process in the real time; on the other hand develop NC installation vehicle for aero-engine making its posture precisely adjusted and on-line controlled on the basis of the location data provided by monitoring platform, which will achieve digitization, automation, information, multi-posture precise control for aero-engine.Make overall design for NC installation vehicle for aero-engine, which consists of three designing parts:multi-axis NC posture adjustment platform, cradle frame car body, multi-functional car body underframe, and also structural design of its mechanisms is conducted on this basis. So NC installation vehicle for aero-engine has multi-posture and full-range adjustment of X, Y, Z, A, B, C six axises while X, Y, Z, B, C axises are under servo precision control with A-axis manual control, which can achieve three-axis interaction control with X, Z, B axises. And frame car owns two installation modes:manual NC control and program automatic adjustment, what’s more hydraulic supported and electric driving functions are added up to further improve its installation stability and maneuverability.Propose a2-PPR (Pan and Revolute) planar parallel mechanism applied in the elevation and inclination mechanism of frame car. Establish its virtual prototype and make kinematics and dynamics analysis to simulate input and output relations:displacement, speed and acceleration, and comparatively study force process trends of each component during four work postures:original position, left inclination, right inclination, vertical elevation, which will provide a theoretical basis and reference on structure optimization and precision control.Make finite element analysis and design optimization on NC installation vehicle. Based on the installation process and the gravity center changes of the aero-engine, co nduct statics analysis of important parts stiffness and do research on deformation and stress characteristics. Moveover, modal analysis is carried on in order to avoid the ris k inherent resonant frequency while aero-engine is being installed.Finally, summarize designing and manufacturing of NC installation vehicle and ma ke static measurement of movement precision. Then analyze key structural deformation in the load stiffness test, which is compared with finite element simulation data to v erify rationality of structure design optimization and actual carrying capacity of structu ral stiffness.The research results meet aero-engine installation needs of high efficiency and qu ality and provide successful demonstration on digitized installation development of othe r large components, which will play a guiding and facilitating role on our current dev elopment of aircraft digital installation technology.