Evaluation of bearing, gears and gearboxes performance with different wind turbine gear oils

Martins, Ramiro C.; Fernandes, Carlos; Seabra, Jorge

doi:10.1007/s40544-015-0094-2

Cited by 13 publications

(11 citation statements)

References 23 publications

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“…Other experimental evidence of scale effects is found in Refs. [6,7]. Ciulli [6] investigated the effect of contact scale on the EHL traction and film thickness by doing measurements with a ball-on-disc machine using three balls in different diameters.…”

Section: Introductionmentioning

confidence: 99%

Scale and contact geometry effects on friction in thermal EHL: twin-disc versus ball-on-disc

Liu

Zhang

Bader

et al. 2021

Tribology International

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Section: Introductionmentioning

confidence: 99%

Scale and contact geometry effects on friction in thermal EHL: twin-disc versus ball-on-disc

Liu

Zhang

Bader

et al. 2021

Tribology International

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“…However, the simplest way to reduce the power losses of an already existing gearbox is to act on the lubricant. Several studies have shown how different lubricants influence efficiency . Despite the great availability of data regarding the relation between lubricant and efficiency, literature is lacking with respect to the effect of the static pressure on the power losses.…”

Section: Power Losses and Efficiency In Gearsmentioning

confidence: 99%

“…Several studies have shown how different lubricants influence efficiency. [17][18][19][20][21][22][23] Despite the great availability of data regarding the relation between lubricant and efficiency, literature is lacking with respect to the effect of the static pressure on the power losses. For this reason, the present research has been focused quantify this effect of the static pressure on efficiency.…”

Section: Power Losses and Efficiency In Gearsmentioning

confidence: 99%

Effect of the static pressure on the power dissipation of gearboxes

Concli

Gorla

Rosa

et al. 2019

Lubrication Science

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Many researches were conducted in the past in order to maximise the efficiency of gearboxes, and for many of the sources of power loss, very effective models and tools are already available and can significantly help to optimise the design. Nevertheless, for the load‐independent power losses of gears only in the recent years some progress has been made. Concerning these losses, numerical simulations can help the designers in optimising the internal shape of the casing, thus ensuring the proper lubrication of all the components and reducing the undesired splashing losses. The amount of lubricant plays a fundamental role: A reduction of the lubricant can be critical from the point of view of adequate lubrication and of failures of the system due to wear, scuffing, and pitting but, on the other side, an excessive amount of lubricant leads to additional power dissipation and could even determine an overheating of the system. Another possibility to improve efficiency could be represented by the reduction of the pressure inside the housing: in this paper, the effect of the static pressure on the load‐independent power losses both for complete‐ and dip‐lubrication has been deeply studied. The numerical results, validated by experimental data, show that a reduction up to 15% of the churning losses can be achieved without reducing the amount of lubricant, that is, without increasing the risk of failures related to lubrication. Based on the results obtained, the reduction of the pressure of the housing proves to be a way to improve the efficiency, provided the related engineering issues are also addressed.

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“…Numerous research works have discussed the inevitability of load-dependent [13][14][15] and independent power loss [16][17][18] in gear drives, as the contact load will majorly disturb the load-dependent power loss in the drive by the influence of contact stress and sliding friction during contact in toothed gearing 19 system. Due to this, it is vital to estimate the varying friction coefficient 20,21 along the contact path.…”

Section: Introductionmentioning

confidence: 99%

Load share model based gear loss factor prediction in high contact ratio spur gear drive

Ravivarman

Sekar

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Gear loss factor is considered to be a crucial parameter, and is governed by factors like contact load, sliding velocity, contact ratio, etc. Sliding power loss is a function of the gear loss factor and friction coefficient. It depends on the contact tooth load and its contact surfaces. A small decline in the gear loss factor and variation in the friction coefficient reduces the energy consumption which improves gear efficiency significantly. Hence, accurate prediction of the gear loss factor is important. This paper deliberates on measuring the contact load of High Contact Ratio (HCR) non-standard gear drive, using the finite element contact model. The input for the gear loss factor is obtained from a 2D elastic contact model using ANSYS. In the previous works the load is considered as a rigid hypothetical element, but in the real case it is varying at each instantaneous contact point. To address this, a more accurate method of predicting the power loss using the contact load share model is proposed. The effectiveness of this technique, built on the computational data and its accuracy are examined. Based on the accuracy, the load share model was suggested to be the most effective one compared to other techniques. The results show that the proposed model provides an effective tool for making reliability assessments on power loss and efficiency of high contact ratio gear drives under diverse operating conditions.

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Evaluation of bearing, gears and gearboxes performance with different wind turbine gear oils

Cited by 13 publications

References 23 publications

Scale and contact geometry effects on friction in thermal EHL: twin-disc versus ball-on-disc

Scale and contact geometry effects on friction in thermal EHL: twin-disc versus ball-on-disc

Effect of the static pressure on the power dissipation of gearboxes

Load share model based gear loss factor prediction in high contact ratio spur gear drive

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