Research On Dynamic Performance Of High-speed Gear Transmission System

Gear transmission system,as the main parts of modern machinery,will be developed in the direction of high speed,high safety and high efficiency.The meshing of gears will inevitably produce impact.And the impact response will be transmitted through various parts of the system,which will drive the whole gearbox to produce noise and even howling.The long-term theoretical research and practical results show that the vibration and noise reduction design is still the hotspot and difficulty of gear system research.In this paper,the study object of the power shunting and conflux gear transmission system under high speed condition is set up.And according to the gear parameter the components are built in detail and their working performance is calculated.The optimal modification design,contact performance parameters and modal parameters are calculated.The main research contents are as follows:3D model of gear system is established according to gear parameters.The static analysis of the transmission system is carried out and the fatigue check of shafting and gear is completed.The tooth surface contact performance is calculated and analyzed.The transmission error and the normal load distribution are optimized with the tooth surface microscopic modification,which lays a foundation for dynamic analysis.The radial displacement and lubrication performance of the sliding bearing in the high speed gear system are analyzed.And the cavitation degree of the whole working face of the bearing is obtained by solving Reno equation with the finite difference method.The effects of rotating speed,oil supply pressure and viscosity of lubricating oil o n the working condition of high speed sliding bearing were studied.Vibration analysis was carried out on the gear system.And the dynamic characteristic of the body and transmission system was solved,including the coupling frame transmission structure of natural frequencies and corresponding vibration mode.By calculating the modal flexibility,frequency response points with flexible change larger was gained.System of bearing and enclosure vibration acceleration response was analyzed.And dynamic meshing force response of each gear was resolved.System dynamic characteristics were got.