Yang W.,Chongqing University |
Lu G.,Chongqing University |
Lv H.,Chongqing Gearbox Co.
Applied Mechanics and Materials | Year: 2011
Thermoelastic instability of multi-disc clutch contributes to the failure of power transmission and as such multi-disc clutch is considered as a research object with a theory model built on perturbation method. The characteristic equations on the thermoelastic instability of geometrically symmetrical and antisymmetrical steel-disc are derived. The results are shown that both wave number and disc thickness have significant influences on the thermoelastic instability of the steel-disc. Choosing a larger wave number or a thicker steel-disc can prevent the thermoelastatic instability state in multi-disc clutch. Compared with the geometrically symmetrical steel-disc, the geometrically antisymmetrical steel-disc is more susceptible to thermoelastic instability. © 2011 Trans Tech Publications. Source
Lin T.,Chongqing University |
Guo J.,Chongqing University |
Liu B.,Chongqing University |
Shen T.,Chongqing University |
Shen T.,Chongqing Gearbox Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2015
In order to study the vibration characteristics and radiation noise of wind power speed-increase gearbox, a torsional vibration model of wind power speed-increase gearbox is established based on the analysis of supporting stiffness of bearing and contact stiffness of gear pairs. By solving the vibration differential equation with the help of Matlab, the frequency and corresponding vibration mode are obtained. With taking stiffness excitation, error exaction and meshing impact exaction into account, the dynamic finite element model of speed-increase gearbox is set up, and the dynamic response simulation is carried out. Regarding vibration displacement of the nodes on gearbox surface as boundary condition, an acoustic boundary element model of speed-increase gearbox is built. The surface acoustic pressure of gearbox and the radiation noise of field points are solved by the direct boundary element method. The results show that there is a great difference between torsion frequency and excitation frequency of wind power speed-increase gearbox, and so the resonance doesn't occur. The maximum structural noise and radiation noise mainly appear near the double octave of the gears meshing frequency of high-speed grade. ©, 2015, Chongqing Medical University. All right reserved. Source
Li B.,Harbin Engineering University |
Zhu T.,Chongqing Gearbox Co. |
Zhang Y.,Harbin Engineering University |
Li L.,Harbin Engineering University
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013
In order to verify the similarity of the servo system of the main rudder (fin) and the flap rudder (fin) between the established Rudder-fin-flap joint control physical simulation system and the prototype system in the drive way and drive way, the method of equivalence analysis based on the similarity principle is presented. The consistency correction method of the judgment matrix is combining with hierarchical analysis principle is given to better determine the weights of each subsystem. Finally, the main rudder/flap rudder servo system is analyzed the equivalence of rudder-fin-flap joint control of physical simulation system, and the reuslut shows that it is feasible. Source
Yang C.,Chongqing University of Technology |
Xu T.,Chongqing University of Technology |
Wu C.,Chongqing Gearbox Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016
Wind-turbine gearbox was one of the most important components of wind-turbine, its dynamic performance had direct impact on the whole system. A coupled nonlinear dynamic FE model containing gears-shafts-bearings-housing for a multi-megawatt wind turbine gearbox of planetary gear transmission was built comprehensively to perform the coupled modal analysis of the whole gearbox with Lanczos method. In consideration of the nonlinear factors of the time-varying mesh stiffness of spur and helical gears, gear errors and gear mesh impact, the dynamic response of the system was studied using direct integration method under the effects of internal excitation. The vibration displacement, velocity and acceleration as the dynamic evaluation indexes of the wind turbine gearbox were obtained, and the structural noise was also analyzed. All results provide useful theoretical basis for dynamic optimization of multi-megawatt wind turbine gearbox system. © 2016, China Mechanical Engineering Magazine Office. All right reserved. Source
Liu W.,Chongqing University |
Lin T.-J.,Chongqing University |
Lv H.-S.,Chongqing University |
Lv H.-S.,Chongqing Gearbox Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2011
The mesh stiffness of gear tooth is simulated by spring elements, the connected bolt between various housings are simplified as bar elements, and the sliding bearing and rolling bearing are simplified as spring dumping elements. Based on them, the gear-shaft-bearing-housing coupled finite element model and boundary element model of GWC6066 marine gearbox are established. Finally, the dynamic response under internal dynamic excitation is analyzed and the vibration severity, structural-borne noise and air-borne noise of the gear system are forecasted. Through the experimental modal analysis of gear system, and the test of vibration response and air pressure, the natural frequencies, vibration severity, structural-borne noise and air-borne noise are obtained. Compared with numerical results, two results show good agreement. Source