Effects of Vibration Isolator on Compound Planetary Gear Train with Marine Twin-Layer Gearbox Case: a Dynamic Load Analy
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ORIGINAL PAPER
Effects of Vibration Isolator on Compound Planetary Gear Train with Marine Twin‑Layer Gearbox Case: a Dynamic Load Analysis Jie Yang1 · Long Yang2 · Rupeng Zhu1 · Weifang Chen1 · Miaomiao Li1 Received: 22 April 2020 / Revised: 12 October 2020 / Accepted: 14 October 2020 © Krishtel eMaging Solutions Private Limited 2020
Abstract Purpose This study aims to take the compound planetary gear train as an example to investigate how the vibration isolator affects the dynamic characteristics of the gear system. Methods The dynamic parameters are obtained from the finite element model of the gearbox case with the vibration isolators by the substructure method. The lumped mass method is used to construct the systematic coupled dynamic model of the compound planetary gear train with the marine twin-layer gearbox case. The dynamic response of the coupled system is calculated by the numerical calculation method of the Fourier series. Results The number of vibration isolators negatively affects the bearing forces of the input shaft, output shaft, and planets. The influence of the number of vibration isolators on LSCs is different in the differential stage and the encased stage. When the vibration isolators stiffness is less than 200 N/μm, the stiffness of the vibration isolator has a significant effect on the bearing forces of the input shaft, output shaft, and planets. The increase in the stiffness of the vibration isolator would increase the LSCs of the differential stage and decrease the LSCs of the encased stage. Conclusions The number and stiffness of the vibration isolator have influences on the bearing forces and the LSCs. Compared with the LSCs in the differential stage, the LSCs in the encased stage are more sensitive to the number and stiffness of vibration isolators. Keywords Load sharing coefficient · Compound planetary gear train · Vibration isolator · Marine gearbox case · Journal bearing
Introduction Excessive vibration of the gearbox in ship equipment not only reduces the reliability of the compound planetary gear train, but also weakens the acoustical stealth of ship [1]. To reduce the vibration noise, vibration isolation, also called elastic components, is generally used in rotating machinery equipment [2, 3]. However, the influence of the vibration isolator on the dynamic behavior of the gear system has not received enough attention. The purpose of this study is to explore how the vibration isolator affects the dynamic
* Rupeng Zhu [email protected] 1
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
The 703 Research Institute of CSIC, Harbin 150078, China
2
behavior of the gear system by taking the compound planetary gear train as an example. The existing literature on the dynamic characteristics of the planetary gear train focuses on time-varying meshing stiffness, piecewise backlash, planet bearing stiffness, and comprehensive gear errors [4–8]. Considering the flexible su
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