Analysis Of The Retraction Extend Mechanism And The Door Open Size Of A Type Of Nose Landing Gear

The landing gear retraction-extend mechanism is the key components of aircraft, whose workingperformance directly affects the security of takeoff-landing and ground motion. Among all the aircraft’scomponts, the aircraft accident caused by the landing gear mechanism malfunction is highest. So that,the search of landing gear mechanism is of great significance. A type of aircraft landing gear wasresearched in this paper, the retraction-extend mechanism was designed, and the kinematics anddynamics was analysised of it. Further researched the kinematics and dynamics of the landing gearretraction-extend mechanism applying virtual prototyping technology.In this paper, the nose landing gear retraction-extend mechanism was designed and in accordancewith design requirements the CATIA digital prototype model of a certain type of aircraft was estabed.On this base, the kinematic analysis was taken and equations of motion of the landing gearretraction-extend mechanism was estabed; the kinematics simulation analysis of the virtual prototypemodel was taken in the DMU of CATIA. The interference and collisions of the retraction-extendmechanism was checked and the movement relationship of key parts have got, and the technical basisof the kinematics performance analysis of this landing gear retraction-extend mechanism was lay.The dynamics analysis and estabed dynamic equations of this type of the landing gearretraction-extend mechanism was taken for the requirement, the ADAMS virtual prototype of thelanding gear retraction-extend mechanism and the dynamics simulation analysis of it was taken, theloading conditions of the key components have got, that provides the basis for the further structure,strengwth design and optimization of the landing gear. Then the dynamic analysis and dynamicsimulation analysis of ADAMS model of the landing gear retraction-extend mechanism was carried out,the dynamic mechanical properties of the movement of landing gear retraction-extend mechanism havegot, the foundation of strength analysis for the mechanism was lay out.The ADAMS rigid-flexible coupling of the airplane landing gear was estabed and the dynamicsimulation analysis of it for the problem of the open size of the door was made that cause by theaerodynamic load at the condition of high speed flying of the airplane, the main factors led to theproblem of the door opened was found out, and the solutions to the problem was lay out. A guaranteefor the airplane of its seaworthiness was providing.