Study On Coupled Vibration Response And Anti-impact Property Of Gear Transmissions System

The speed, efficiency, automation, precision and reliability for mechanical products are required higher and higher while vibration and noise lower and lower, weight lighter at present. Gear system is the important component part of automobile and engineering machine transmission system, its operating characteristic has the most important influence for entire transmission system. Along with the raising of automobile speed and power, gear transmission are developing toward high speed and heavy load, The issues relating to its dynamics behavior have brought a great concern to scholars all over the world. Since the vibration and noise of the automobile gear of our country is generally more serious than foreign product, therefore the research of coupled nonlinear dynamics behavior of the gear transmission is one of the most important topics that must be resolved urgently in the engineering application.The goal of the paper is systematically to predict the vibration and noise of gear system during the design stage by establishing dynamic model instead of using experiential results and by replacing static design with dynamic design. At last an ideal low-vibration and low-noise gear transmission product can be designed by modern advanced design technique. The focus of this thesis is on the coupling nonlinear dynamics problem of the gear system. Some progress and accomplishment have been made on the key issues such as coupling vibration of the 3-D dynamic contact-impact characteristic, the reasons of gear interior excitation, vibration response in the interior excitation, and the vibration characteristic of the exterior impact. The major works of this thesis are listed as follow:1.The vibration and noise of gear system are investigated perfectly. The main interior causes are three excitations: stiffness excitation, error excitation and meshing shock excitation.2.The excitations of gearing are simulated by finite element method and error equivalent method. The excitation forces in gearing are obtained, which are the bases of the vibration response calculation of gearbox.3.Large-scale integrated FEM dynamic model of gear system including gears, shafts and gearbox is established. The dynamic coupled characteristics of gearbox are perfectly described by the model.4.FEM modal analysis is completed on workstation by I-DEAS software. The...