Chongqing, China
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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.

Yang W.,Chongqing University | Lu G.-D.,Chongqing University | Lv H.-S.,Chongqing University | Lv H.-S.,Chongqing Gearbox Co. | And 2 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2011

To solve the failure problem of power transmission caused by warping, crackle on dual-steel-disc of wet multi-disk clutch, a shipborne wet multi-disk clutch is taken as a research object, models of generation and distribution of friction heat flux are built and numerical methods to solve temperature field and coupled stress field are put forward. Research methods of thermo-mechanical coupling problem of wet multi-disk clutch are proposed. The thermo-mechanical coupling phenomenon of dual-steel-disc is investigated, and the failure mechanism of dual-steel-disc of wet multi-disk clutch is revealed. In the engagement process, the results of temperature field show that the temperature of the dual-steel-disc gradually increases from the inner edge to the outer edge, and the temperature of friction surface reaches the highest at 2.6 s in the 3-second-engagement. The rules of thermal stress distribution are attained that the circumferential tensile thermal stress appears in the region close to the inner edge, while the radial tensile thermal stress appears in the region close to the outer edge. The theoretical basis to solve the thermal failure problem of dual-steel-disc of wet multi-disk clutch is provided.

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.

Xu W.,Chongqing University | Chen Y.,Chongqing University | Wang J.,Chongqing Gearbox Co. | Wang T.,Chongqing Gearbox Co.
Applied Mechanics and Materials | Year: 2011

The objective is to analyze the fracture of output shaft in the two speed gearbox, which was broken after one year service. By means of software KISSsoft and KISSsys, a strength calculation has been carried out on the transmission system, which shows that the output shaft was designed properly and it should be able to withstand the loads applied. The metallurgical microstructure inspection and SEM observation have been conducted to seek the failure reason. Lots of silicate inclusions in the fracture origin have been found out by SEM observation, which cause the initiation of shaft failure most probably. Obvious dendritic segregation in the center area of the fracture surface, intercrystalline fracture, cleavage fracture and unreasonable metallurgical microstructure show the evidence that the forging process and the heat treatment on the output shaft are not qualified, which can contribute to the initiation and spread of shaft fracture. © 2011 Trans Tech Publications.

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.

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.

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.

Lin T.-J.,Chongqing University | Wang Q.,Chongqing University | Xie Y.,Chongqing University | Pan L.,Chongqing University | Lu H.-S.,Chongqing Gearbox Co.
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2016

Firstly, by taking the oil flow path of wet multi-disc friction clutch in marine as research object, the fluid dynamic simulation of disk-separating process is conducted by means of dynamic mesh technique, and the distribution of oil film thickness between friction and steel disks is recovered. Secondly, on the basis of hydrodynamic lubrication theory and Newton's inner friction law, a mathematical model describing the towing torque of wet multi-disc clutch that contains friction plates with radial and circumferential grooves is established, and the analytical solutions of towing torque are obtained. Then, a parametric discrete model of oil film is established and the numerical solutions of towing torque are achieved by means of finite element method. Finally, the towing torque affected by groove form, drive shaft speed and oil temperature is analyzed. Calculated results show that (1) the numerical solutions of towing torque accord well with the analytical ones; (2) the groove form has a great influence on the towing torque; and (3) the towing torque of clutch increases with the increase of drive shaft speed and with the decrease of oil temperature. © 2016, Editorial Department, Journal of South China University of Technology. All right reserved.

Liu B.,Chongqing University | Lin T.-J.,Chongqing University | Wang D.-H.,Chongqing University | Lu H.-S.,Chongqing Gear Box Co.
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

In order to study the bifurcation characteristics and dynamic load coefficient of a multi-stage gear transmission system under a complex excitation, established was a non-linear dynamic model with six degrees of freedom, including the time-change engagement rigidity, engagement damping, transmission error and backlash etc. factors. The 4-5 order step change Runge-Kutta method was used to seek solutions to the non-dimensional dynamic differential equation of the system. The calculation results show that with an increase of the backlash and engagement rigidity, the system will tend to be unstable and approximately undergo a state changing from a single period and multi-period to chaotic movement and the dynamic load coefficient will assume an ascending tendency and emerge a disengagement phenomenon. When the engagement damping ratio and twist rigidity increase, the system will gradually tend to be stable, transmitting from the chaotic movement to a single period movement, the dynamic load coefficient gradually decreasing and the gear pair transmitting to a lateral impingement or no-impingement state, the engagement phenomenon getting improved. ©, 2015, Harbin Research Institute. All right reserved.

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