High-pressure behavior and tribological properties of wind turbine gear oil

Mia, Sobahan; Mizukami, Shota; Fukuda, Ryusei; Morita, Shigeki; Ohno, Nobuyoshi

doi:10.1007/s12206-009-1179-5

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…22 Here, the pressure–viscosity coefficient increases with the viscosity. 23 Thus, the shear strength of PIB-H is assumed to be higher than for PIB-M. In particular, the previous report suggests that PIB-M is the most suitable lubricant of the three kinds of PIBs for tightening bolted joints because PIB-M shows a more beneficial lubrication performance under the thin film lubrication regime than either PIB-L or PIB-H. 17 From the change ratio Δμ w in Figure 6(b), it can be seen that the friction coefficient μ w for VG46 decreases remarkably during the tightening process.…”

Section: Resultsmentioning

confidence: 99%

Robustness of polyisobutylene for friction coefficients between bearing surfaces of bolted joints

Hashimura

Miki

Otsu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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In bolted joints, clamp force must be accurately controlled to secure their reliability. However, the clamp force varies widely in each tightening because friction coefficients at thread surfaces and bearing surfaces vary in each tightening due to lubricants, configuration error of bolts, surface roughness, and surface hardness, among other things. In this study, we investigated the robustness of polyisobutylene and ISO VG46 machine oil during the tightening process for several parameters of tightening conditions. We especially focused on variations of the friction coefficient between bearing surfaces at an appropriate target clamp force of M8 bolt/nut assemblies and change rates of the friction coefficients from the middle to the end of the appropriate target clamp force. Results showed that the friction coefficients at the target clamp force varied widely if ISO VG46 machine oil was used as a lubricant. In contrast, the variations of the friction coefficients in which polyisobutylene was used for tightening were small. Results also showed that the friction coefficients invariably decreased about 20% from the middle to the end of the target clamp force if ISO VG46 machine oil was used for the lubricant. However, if polyisobutylene was used, the friction coefficients were almost constant for all tightening instances.

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Section: Resultsmentioning

confidence: 99%

Robustness of polyisobutylene for friction coefficients between bearing surfaces of bolted joints

Hashimura

Miki

Otsu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Gearbox Mia et al 57 determined the pressure-viscosity coefficient from high-pressure rheology for a mineral oil and different PAO wind turbine oil formulations. The values found are slightly lower than those calculated through Gold's equation.…”

Section: Oilmentioning

confidence: 99%

Power loss prediction: Application to a 2.5 MW wind turbine gearbox

Fernandes

Hammami

Martins

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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A 2.5 MW wind turbine gearbox design was considered to perform a power loss prediction using different wind turbine gear oil formulations. A gearbox power loss model, previously validated with experimental results, was used to predict the efficiency of a full wind turbine planetary gearbox. The power loss model account the gears and rolling bearing losses using well established models calibrated with a method proposed by the author. The calculations clearly showed that significant energy savings can be achieved by selecting different base oils, modifying gear tooth geometry, or combining both.

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“…11 There have also been other studies that report surface-adsorbed layers that are insensitive to pressure. 12 Therefore, the role of pressure and what determines a system's sensitivity to pressure are still not very well understood. In this paper, we present a systematic study on the role of pressure on three different systems that provide key insights into the role of pressure on adsorption.…”

Section: ■ Introductionmentioning

confidence: 99%

“…There have also been other studies that report pressure dependence in a range of different systems including adsorption of insulin on chromatographic surfaces, enzymatic activity onto various surfaces, pressure reversal of anesthesia, and pressure-induced structural changes of surface-adsorbed polymer films , and proteins . There have also been other studies that report surface-adsorbed layers that are insensitive to pressure …”

Section: Introductionmentioning

confidence: 99%

A Novel Study on the Role of Pressure on Surface Adsorption from Solutions

2023

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In this work, we present experimental data on the behavior of model additives adsorbed at the solid/liquid interface as a function of pressure. We report that some additives adsorbed from non-aqueous solvents exhibit rather little variation with pressure, while others exhibit more significant changes. We also display the important pressure dependence of added water. This pressure dependence is relevant, indeed central to many commercially important situations where the adsorption of molecular species to the solid/liquid interface under high pressure is key, such as wind turbines, and this work should help in understanding how protective, anti-wear, or friction-reducing agents can persist (or not) under these extreme conditions. With a very significant gap in the fundamental understanding of the role of pressure on adsorption from solution phases, this important fundamental study provides a methodology to investigate the pressure dependence of these academically and commercially important systems. In the best case, one may even be able to predict which additives will lead to more adsorption under pressure and avoid those that may desorb.

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High-pressure behavior and tribological properties of wind turbine gear oil

Cited by 15 publications

References 5 publications

Robustness of polyisobutylene for friction coefficients between bearing surfaces of bolted joints

Robustness of polyisobutylene for friction coefficients between bearing surfaces of bolted joints

Power loss prediction: Application to a 2.5 MW wind turbine gearbox

A Novel Study on the Role of Pressure on Surface Adsorption from Solutions

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