Entity

Time filter

Source Type


Zhou J.-X.,Xinjiang University | Zhou J.-X.,Center for Post Doctoral Studies of Mechanical Engineering | Sun W.-L.,Xinjiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

According to the structural characteristics of herringbone gear transmission, the dynamic response of a herringbone gear box was studied considering excitations including time-varying mesh stiffness, gear errors and inertial force, herringbone gears axial positioning and sliding bearings. The dynamic model was solved by using Newmark integral method, then the time histories of the system's bearing forces were obtained. Taking the bearing forces as excitations, the gearbox noise radiation was computed with FEM/BEM. The distribution of sound pressure and frequency spectra of noise for field points were obtained, then the spatial distribution and frequency components of the gear box noise were analyzed. The effects of the connection stiffness of left and right sides of herringbone gears and axial support stiffness on the gear box noise radiation characteristics were discussed. The study provided a theoretical guide for vibration reduction and anti-noise design of a herringbone gear box. Source


Zhou J.-X.,Xinjiang University | Zhou J.-X.,Center for Post Doctoral Studies of Mechanical Engineering | Sun W.-L.,Xinjiang University | Cui Q.-W.,Xinjiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

According to the structural characteristics of a herringbone gear transmission system, the dynamic response of the system was analysed in consideration of excitation factors including time-varying mesh stiffness and gear errors, herringbone gears axial positioning and sliding bearing performances. A bending-torsion-axial motion coupled dynamic model of the transmission system was established and solved by using Newmark integral method. Furthermore, the time histories of the dynamic forces of bearings of the transmission system were obtained. Taking the bearing forces as excitations, the gearbox noise radiation characteristics were investigated. The distribution of sound pressure and the frequency spectra of noise at field points were achieved, and then the spatial distribution and frequency components of the noise were analyzed. The effects of gear parameters including helical angle, face width, addendum coefficient, tip clearance coefficient and pressure angle, connection stiffness between left and right sides of herringbone gears and axial support stiffness on the gear reducer noise radiation were discussed. The study provided a useful theoretical guideline for the design of gearboxs. ©, 2015, Chinese Vibration Engineering Society. All right reserved. Source


Zhou J.,Xinjiang University | Zhou J.,Center for Post Doctoral Studies of Mechanical Engineering | Sun W.,Xinjiang University | Yuan L.,Xinjiang University
Shock and Vibration | Year: 2016

In order to research the vibroimpact characteristics of a planetary gear transmission system under high speed and lightly loaded conditions, a new modeling method is proposed. In the modeling process, linear spring was used to simulate gear mesh elasticity under heavy load cases, and Hertz contact theory was used to calculate the contact force of gear pair under light load cases. Then, effects of the working conditions on the system vibroimpact characteristics are analyzed. The results show that, with input speed growing, the mesh force produced obvious fluctuations on the resonance frequencies of the sun gear and carrier torsion vibration, ring gear's transverse vibration under the heavy load. Under light load condition, the collision vibration occurs in the gear pair; the changing trend of the contact force shows strongly nonlinear characteristics. The time of mesh-apart in gears pair decreases gradually as the load is increased; until it reaches collision vibration threshold value, the gear pair is no longer mesh-apart. With increasing of the input speed, the time of mesh-apart is decreased gradually; the fluctuation amplitude of contact force shows a linearly increasing trend. The study provides useful theoretical guideline for planetary gear transmission low-noise design. © 2016 Jianxing Zhou et al. Source


Zhou J.-X.,Xinjiang University | Zhou J.-X.,Center for Post Doctoral Studies of Mechanical Engineering | Sun W.-L.,Xinjiang University | Wan X.-J.,Xinjiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The dynamic model of a cylindrical gear transmission system was built considering time-varying mesh stiffness, gear errors and bearing supporting. Dynamic load of the bearing was taken as an excitation, Vibration and noise radiation of a gear reducer were studied by using FEM/BEM. In case of no gear manufacturing errors, changes of radiated noise of the gear reducer versus rotation speed and load were calculated, respectively by using both numerical simulation and Kato's formulae, the results of both two methods agreed well. The influence of gear precision on the gear reducer noise was analyzed, then the relation between gear precision and the gear reducer noise was built. A gear reducer noise prediction formula was fitted in consideration of coupling effect between gear precision and operating conditions. The accuracy of the formula was validated with gear reducer noise measuring tests. Source

Discover hidden collaborations