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<p>The use of journal bearings as planetary gear bearings in wind turbines instead of roller bearings is becoming common, as journal bearings are advantageous in terms of the torque density of the gearbox. The transition from roller bearings to journal bearings results in different bearing stiffness and damping characteristics, thereby altering the dynamics of the wind turbine gearbox and the load-bearing behavior of the gears. The dynamic behavior of journal bearings is highly dependent on operating conditions, as fluid film heights and hydrodynamic pressures vary with speed. To conduct a&#xa0;detailed analysis of these bearings and their effect on the gearbox dynamics, elasto-hydrodynamic simulations (EHD) coupled with multibody simulations (MBS) are generally performed. These simulations typically require significant computational resources. In order to reduce the calculation times for optimizing the gearbox with regard to Noise-Vibration-Harshness and load-bearing capacity, a&#xa0;simplified representation of the bearing in multi-body simulations is desired, ideally as a&#xa0;simple stiffness and damping matrix.</p><p>While standard approaches exist for deriving stiffness and damping matrices for journal bearings, these methods do not adequately capture the complex deformations and load conditions present in planetary journal bearings. As a&#xa0;result, these bearings exhibit stiffness and damping behavior that depends on local conditions and operating points. Therefore, this paper presents an approach to extract these stiffness and damping values from EHD simulations across the operating range of a&#xa0;wind turbine. These extracted values are applied to a&#xa0;multi-body simulation model of a&#xa0;wind turbine gearbox. This paper introduces a&#xa0;novel approach for modelling planetary journal bearings. By dividing the bearing into small slices, a&#xa0;multi-slice bearing is created that can capture the complex stiffness and damping characteristics present in planetary journal bearings. This sliced bearing modelling method is compared with a&#xa0;coupled EHD-MBS model of the same wind turbine gearbox to analyze the effects on system dynamics. The novel planetary journal bearing modelling will enable faster design of wind turbine gearbox components and mitigate vibrations efficiently.</p>

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Efficient dynamic simulations of planetary journal bearings in wind turbine gearboxes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月19日

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  • Mattheüs Lucassen,
  • Georg Jacobs,
  • Benjamin Lehmann

摘要

The use of journal bearings as planetary gear bearings in wind turbines instead of roller bearings is becoming common, as journal bearings are advantageous in terms of the torque density of the gearbox. The transition from roller bearings to journal bearings results in different bearing stiffness and damping characteristics, thereby altering the dynamics of the wind turbine gearbox and the load-bearing behavior of the gears. The dynamic behavior of journal bearings is highly dependent on operating conditions, as fluid film heights and hydrodynamic pressures vary with speed. To conduct a detailed analysis of these bearings and their effect on the gearbox dynamics, elasto-hydrodynamic simulations (EHD) coupled with multibody simulations (MBS) are generally performed. These simulations typically require significant computational resources. In order to reduce the calculation times for optimizing the gearbox with regard to Noise-Vibration-Harshness and load-bearing capacity, a simplified representation of the bearing in multi-body simulations is desired, ideally as a simple stiffness and damping matrix.

While standard approaches exist for deriving stiffness and damping matrices for journal bearings, these methods do not adequately capture the complex deformations and load conditions present in planetary journal bearings. As a result, these bearings exhibit stiffness and damping behavior that depends on local conditions and operating points. Therefore, this paper presents an approach to extract these stiffness and damping values from EHD simulations across the operating range of a wind turbine. These extracted values are applied to a multi-body simulation model of a wind turbine gearbox. This paper introduces a novel approach for modelling planetary journal bearings. By dividing the bearing into small slices, a multi-slice bearing is created that can capture the complex stiffness and damping characteristics present in planetary journal bearings. This sliced bearing modelling method is compared with a coupled EHD-MBS model of the same wind turbine gearbox to analyze the effects on system dynamics. The novel planetary journal bearing modelling will enable faster design of wind turbine gearbox components and mitigate vibrations efficiently.