The Study On Vibration Strengthening Device For Aircraft Large Parts

It is very difficult for the surface strengthening treatment for some special parts ofthe aircraft in aviation engineering (such as the plane beam), domestic general methodcan only use manual polishing at present, not only it is difficult to guarantee the quality,and low production efficiency, high labor intensity of workers. The article gives out avibration of strengthen device for the large aircraft parts, based on the analysis ofdomestic and foreign about the application of mechanical vibration on surfacestrengthening processing. The device through the way of vibration on the plane surfacestrengthening treatment of large parts, in order to improve the parts of fatigue strengthand wear resistance for the main purpose, and can replace manual labor. And the wholecontent can be showed as:The overall design for the vibrating-strengthening device is studied in thisdissertation. The characteristics of both the aircraft parts and the processes for them areanalyzed. Designs of the vibrating-strengthening devices for different kinds of aircraftparts are proposed. A physical model for the vibrating-strengthening device is set up.A detail design method for the vibrating-strengthening device is studied. Thevibrating-strengthening device is comprised of excitation system, isolation system andauxiliary system. Eccentric block is the exciting component in the excitation system.The influences of both the rotating direction and the position of the eccentric block onthe exciting force are investigated. The process of determining the size and the mass ofthe eccentric block as well as the method for designing the excitation system ispresented. Design parameters for the isolator are given when designing the isolationsystem. And the factors which are needed to be considered during the design are alsodisplayed. The method for designing the isolator is given. Auxiliary system is comprisedof air-compressing system and electrical control system. The design methods for thesetwo systems are also presented. Simulation method for the vibrating behavior of the vibrating-strengthening deviceis proposed. CAD and FE models of the device are built. Based on FE method andaccording to both DOF modal theory and harmonic response theory, the vibrationbehavior of the device as well as the harmonic response of the exciting component isobtained.Finally, the performance parameters of the vibrating-strengthening device arevalidated through testing method. The principle for detecting the vibration frequencyand amplitude is introduced while the measuring method is given. The method how tocheck and control the strengthening effect on the surface of the parts through theexperiment specimens is proposed.