Dynamic modeling and response of a spur planetary gear system with journal bearings under gravity effects

Liu, Zhenxing; Liu, Zhansheng; Yu, Xiangyu

doi:10.1177/1077546317707878

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…Furthermore, gravity effects on the balance position of the floating inner gear ring (Figure 1(a)) were greater than that of the non-floating planetary gears (Figure 1(b)). Liu et al [14] studied the action of gravity on the motion trajectory of components in a planetary system and observed that gravity effects enlarge the orbits of the planetary gears (see in Figure 1(c)).…”

Section: Gravity Effects On Time-domain Dynamic Responsementioning

confidence: 99%

A review on dynamics of gear systems with gravity effects

Du,

Yang,

Tong

et al. 2024

Third International Conference on Advanced Manufacturing Technology and Electronic Information (AMTEI 2023)

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Gear systems are extensively implemented in industrial applications such as shipping, wind turbine and aerospace. The performance of the transmission equipment will be directly affected by the dynamic characteristics of the gear system. As the demand for high-power and heavy-load gear transmissions continues to rise, gear systems are inclined to exhibit high volume and weight. It is essential to take gravity effects into consideration during the analysis of gear dynamics, because they will make components of gear systems deform, change the tooth contact status and consequently affect the dynamic response of gear systems. In the past few decades, research on the gear systems dynamics with gravity effects has increased dramatically. This paper provides a comprehensive review of published literatures related to the gear dynamics considering gravity effects. The studies focus on three primary themes: the impact of gravity upon the time-domain dynamic response, the impact of gravity upon the frequency-domain dynamic response, and the impact of gravity upon the gap nonlinear response of gear systems. Finally, some conclusions are summarized.

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Section: Gravity Effects On Time-domain Dynamic Responsementioning

confidence: 99%

A review on dynamics of gear systems with gravity effects

Du,

Yang,

Tong

et al. 2024

Third International Conference on Advanced Manufacturing Technology and Electronic Information (AMTEI 2023)

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“…Some studies have been conducted for the planetary gear stage using journal bearings in planet gears. In the simulation-based investigation in [13], it was found that the changing clearance in the journal bearings affects the gear backlash and teeth forces. The investigations in [14] concluded that the load-sharing characteristics of planetary gears are related to the parameters of the journal bearing.…”

Section: Introductionmentioning

confidence: 99%

The influence of journal bearings on the gearbox dynamics of a 5 MW wind turbine drivetrain

Siddiqui,

Chodvadiya,

Luo

2023

J. Phys.: Conf. Ser.

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In recent years, journal bearings have been replacing roller bearings in wind turbine gearboxes, as they are believed to provide higher reliability compared with roller bearings. However, replacing roller bearings with journal bearings can drastically change the gearbox dynamics. Journal bearings have complex dynamics at different operating speeds, and, as a wind turbine operates at various speeds, it is vital to analyze the gearbox dynamics for the entire speed range. This contribution presents the dynamic response of a wind turbine gearbox when the roller bearings of the high-speed shaft are replaced with journal bearings. This is done by performing a comparative case study using a detailed multibody simulation (MBS) model of a 5 MW reference wind turbine drivetrain. A dynamic model of the journal bearings, developed in Simulink, is dynamically coupled with the 5 MW drivetrain MBS model using co-simulation. The simulation results for the gearbox vibration as well as gear forces are compared with the simulation results of the drivetrain model with roller bearings. The findings from this work will help in clarifying the advantages (or disadvantages) of using journal bearings instead of roller bearings in wind turbine gearboxes.

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“…Guo and Parker 36 showed that the nonlinearity caused by bearing clearance can decrease the resonances in helicopter gear sets. Also, the dynamic behavior of spur planetary gear in different backlashes was investigated by Liu et al 37 through a lumped-parameter model, which considered the nonlinearity introduced by the gravity effect and bearing oil film. They used Newmark integration to calculate the dynamic responses.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of the nonlinear planetary gear model in nonstationary conditions

Hammami

Mbarek

Fernández

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The nonlinear effects in gearboxes are a key concern to describe accurately their dynamic behavior. This task is difficult for complex gear systems such as planetary gearboxes. The main aim of this work is to provide responses to overcome this difficulty especially in nonstationary operating regimes by investigating a back-to-back planetary gearbox in steady conditions and in the run-up regime. The nonlinear Hertzian contact of teeth pair is modeled in stationary and nonstationary run-up regime. Then it is incorporated in to a torsional model of the planetary gearbox through different mesh stiffness functions. In addition, motor torque and external load variation are taken into account. The nonlinear equations of motion of the back-to-back planetary gearbox are computed through the Newmark- β algorithm combined with the method of Newton–Raphson. An experimental validation of the proposed numerical model is done through a test bench for both stationary and run-up regimes. The vibration characteristics are extracted and correlated to speed and torque. Time–frequency analysis is implemented to characterize the transient regime during the run-up.

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Dynamic modeling and response of a spur planetary gear system with journal bearings under gravity effects

Cited by 13 publications

References 31 publications

A review on dynamics of gear systems with gravity effects

A review on dynamics of gear systems with gravity effects

The influence of journal bearings on the gearbox dynamics of a 5 MW wind turbine drivetrain

Dynamic behavior of the nonlinear planetary gear model in nonstationary conditions

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