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Life Distribution Transformation Model of planetary gear system

Chinese Journal of Mechanical Engineering 2018年第2期31卷 208-215页

作者： Ming Li Li-Yang Xie Hai-Yang Li Jun-Gang Ren Key Laboratory of Vibration and Control of Aviation Propulsion system Ministry of Education Northeastern University

planetary gear systems have been widely used in transportation, construction, metallurgy, petroleum, aviation and other industrial fields. Under the same condition of power transmission, they have a more compact structure than ordinary gear train. However, some critical parts, such as sun gear, planet gear and ring gear often suffer from fatigue and wear under the conditions of high speed and heavy load. For reliability research, in order to predict the fatigue probability life of planetary gear system, detailed kinematic and mechanical analysis for a planetary gear system is firstly completed. Meanwhile, a gear bending fatigue test is carried out at a stress level to obtain the strength information of specific gears. Then, a life distribution transformation model is established according to the order statistics theory. Transformation process is that, the life distribution of test gear is transformed to that of single tooth, and then the life distribution of single tooth can be effectively transformed to that of the planetary gear system. In addition, the effectiveness of the transformation model is finally verified by a processing method with random censoring data.

关键词： planetary gear system Reliability modeling Probabilistic life Random censoring data

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Dynamical load sharing behaviors of heavy load planetary gear system with multi-floating components

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第1期9卷 146-158页

作者： Xiangyang Xu Tianhong Luo Jiayuan Luo Xia Hua Reza Langari School of Mechatronics and Vehicle Engineering Chongqing Jiaotong University Chongqing 400074 P.R.China College of Optoelectronic Engineering Chongqing University Chongqing 400030P.R.China School of Mechanical Engineering Purdue University West Lafayette IN 47907-2088United States Department of Mechanical Engineering Texas A&M University College Station 77843 United States

To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system,a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is *** a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing *** influencing factors,such as supporting stiffness,positions error of sun or carrier,and external input load are analyzed on the dynamical load sharing of the planetary gear system with multi-floating *** results demonstrate that the load sharing condition of the system is best when both the sun gear and planet gears are multi-floating at the same *** the planet gear position errors remain constant,reducing the flexible pin stiffness of planet gear or increasing external input load can effectively improve the load *** conclusions are verified by the relevant experiments.

关键词： Multi-floating components planetary gear system dynamical model load sharin

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Dynamic Modeling and Condition Monitoring of Spalling Fault of planetary gear system

Dynamic Modeling and Condition Monitoring of Spalling Fault ...

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第十四届全国振动理论及应用学术会议(NVTA2021)

作者： Wei Cao Yahong Guo Zhenyuan Gou Zhuangzhuang Yang Zhao Han Jinxiu Qq School of Mechatronic Engineering Xi’an Technological University

In view of the complex structure of planetary gear system, the geometric model of healthy gear and the spalling model of planetary gear tooth surface are established by using energy method, and the influence of degree of spalling fault on meshing stiffness is studied. Considering the factors such as time-varying meshing stiffness, comprehensive meshing error and tooth side clearance, the dynamic model of planetary gearbox transmission system is established, and the influence of tooth surface spalling fault on the vibration response of the system is analyzed. The planetary gearbox test rig is built to obtain the vibration response signal, and the GWO-TVF-EMD method is used to process these vibration response signal. Which is further compared with the model response signal to verify the accuracy of the dynamic model. This work provides a theoretical basis for the health monitoring of the planetary gear train.

关键词： planetary gear system Spalling fault Time-varying meshing stiffness Dynamic model Health status monitoring

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Nonlinear Dynamic Analysis of planetary gear Train system with Meshing Beyond Pitch Point

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第6期37卷 884-897页

作者： TANG Xin BAO Heyun LU Fengxia JIN Guanghu National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China National Key Laboratory of Science and Technology on Helicopter Transmission AECC Hunan Aviation Powerplant Research InstituteZhuzhou 412002P.R.China

Nonlinear dynamic analysis was performed on a planetary gear transmission system with meshing beyond the pitch *** parameters of the planetary gear system were optimized,and a two-dimensional nonlinear dynamic model was established using the lumped-mass ***-varying meshing stiffness was calculated by the energy *** model consumes the backlash,bearing clearance,time-varying meshing stiffness,time-varying bearing stiffness,and time-varying friction *** time-varying bearing stiffness was calculated according to the Hertz contact *** load distribution among the gears was computed,and the time-varying friction coefficient was calculated according to elastohydrodynamic lubrication(EHL)*** dynamical equations were solved via numerical *** global bifurcation characteristics caused by the input speed,backlash,bearing clearance,and damping were *** system was in a chaotic state at natural frequencies or frequency *** system transitioned from a single-period state to a chaotic state with the increase of the *** bearing clearance of the sun gear had little influence on the bifurcation *** amplitude was restrained in the chaotic state as the damping ratio increased.

关键词： meshing beyond pitch point planetary gear system nonlinear time-varying bearing stiffness timevarying meshing stiffness multiple clearances bifurcation time-varying friction coefficient

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The effect of the planet's number on dynamic characteristics of planetary gear systems

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Journal of Chongqing University 2016年第3期15卷 103-110页

作者：王立新 WU Shuang-ma LIU Jun-hui School of Mechanical Engineering Zhengzhou UniversityZhengzhou 450001P.R.China

Considering the effect of planet's number on the dynamic characteristics of the planetary gear system, a translationtorsion lumped-parameter model of 2K-H spur planetary gear system was established. Through the analysis of numerical solution, the results show that 1) When the planet's number is more than 3, the order of the natural frequency will become the same; 2) When the planet's number increases, the natural frequencies of planet mode remain invariant, but when it comes to rotational mode and translational mode, the higher order natural frequencies increase and the lower order natural frequencies decrease; 3) The planet's number has a great impact on the higher order natural frequencies and a little impact on the lower order natural frequencies; and 4) To avoid the resonance, we can appropriately increase or decrease the number of the planet.

关键词： planet's number dynamic characteristics planetary gear system

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