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RISS 인기검색어
- 검색키워드
- 저자 : Xinglong Hu (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Effects of dynamic transmission errors and vibration stability in helical gears
Jing Wei,Pan Gao,Xinglong Hu,Wei Sun,Jing Zeng 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
Transmission error is an important reason for instability in helical gears. A six-degree-of-freedom dynamic model coupled flexional,torsional and axial motion of a helical gear transmission system, which includes time varying mesh stiffness, bearing supporting stiffness,mesh damping and backlash, is developed, after taking into account the dynamic characteristics and vibration responses of helical gear inthree dimensions. Influences of involute contact ratio, bearing supporting stiffness, mesh damping and backlash on the dynamic transmissionerrors and vibration stability of the helical gear system are investigated using numerical simulation technique. The effects on dynamictransmission errors and stabilities by contact ratio, supporting stiffness and mesh damping as well as gear backlash are analyzed. The intrinsic relationship between above parameters and dynamic transmission errors and stabilities for helical gear system are presented. The stable and unstable regions under different parameters are given. The results in this paper can be helpful to the dynamic and stabledesign of a helical gear transmission system.
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An Analyzing Method of Coupled Modes in Multi-Stage Planetary Gear System
Wei Sun,Jing Wei,Xin Ding,Xinglong Hu,Qingguo Wang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This paper analyzed the natural frequency and coupled mode characteristics in multi-stage planetary gear system. A dynamic modelof multi-stage planetary gears with general description is established based on the lumped mass method. Solving the associatedeigenvalue problem, the vibration modes of the system with identical, equally spaced planets are classified into rotational,translational and planet modes with unique properties. A criterion to distinguish the dominant vibration stage for the two coupledmode types, rotational mode and translational mode, are provided by comparing the eigensensitivity to the component parametersof different planetary stages. Taken the dominant vibration stage as an independent single-stage planetary gear system, the naturalfrequencies and vibration modes are observed to be similar to the multi-stage. It is shown that the coupling in the multi-stageplanetary gear system grows as the frequency reduces. In rotational modes and translational modes, the highest eigensensitivity tomesh stiffness and planet bearing stiffness of each stage are associated with different frequencies in the higher-frequency range, whilethe highest eigensensitivity to bearing stiffness of carriers, rings, and suns occurred in the lower-frequency range.
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A study on load-sharing structure of multi-stage planetary transmission system
Wei Sun,Xiang Liu,Jing Wei,Aiqiang Zhang,Xin Ding,Xinglong Hu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Unequal load distribution is a crucial factor in decreasing bearing capacity and stability of the planetary transmission system. In thispaper, a dynamical model of two-stage helical planetary gear transmission system is established based on lumped-parameter method andLagrange general function. Nonlinearity of gear tooth backlash and error is taken into account. Four load-sharing structures are proposedto study the load-sharing performance. A method to calculate dynamic sensitivity of load-sharing coefficient to errors is presented thatcan provide a reference to component precision determination in order to make planetary system have a better load distribution. Finally, anumerical method of load-sharing performance is validated by a test. These results provide fundamental basis for multi-stage planetarygear transmission system design.
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