Study on the Influence of the Temperature Rise and Frictional Coefficient of Brake Shoe on Braking of Wind Turbine

Wang, Zhi Jie; Liu, San Ming; Luan, Lin Lin; Xiao, Hua Qiao

doi:10.4028/www.scientific.net/amr.443-444.1045

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…But as the friction heat has not enough time to transfer, so a high surface temperature is generated, which often causes a rapid falling of the brake shoe's tribological performance (Wang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…During the emergency braking of mine hoister, a higher braking pressure will cause a shorter braking process when the initial braking velocity is certain. But as the friction heat has not enough time to transfer, so a high surface temperature is generated, which often causes a rapid falling of the brake shoe's tribological performance (Wang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of braking pressure on tribological performance of non‐asbestos brake shoe for mine hoister during emergency braking

Bao

Zhu

Tong

et al. 2012

Industrial Lubrication and Tribology

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Purpose -The purpose of this paper is to describe some tribological experiments which were executed to find the influence of braking pressure on tribological performance of non-asbestos brake shoe used in mine hoister during its emergency braking. Design/methodology/approach -The WSM-3 non-asbestos brake shoe, which has been widely used in mine hoister, was selected as experimental material. Some tribological experiments of the brake shoe sliding on 16Mn steel were investigated on the X-DM friction tester by simulating of emergency braking conditions of mine hoister. Three kinds of tribological indexes: friction coefficient, stability coefficient of friction coefficient, and wear rate were considered to score the tribological performance and the morphology of worn surfaces were observed through the S-3000N scanning electron microscopy (SEM) to explore the tribological mechanisms. Findings -It was found first, that the instant friction coefficient is not constant during emergency braking. After a short climbing period, it rises gradually to steady value. Second, with the increasing of braking pressure, the mean friction coefficient rises first then falls, while its stability coefficient falls gradually. The wear rate rises continuously with the braking pressure increasing. Also, the rising velocity of wear rate at high pressure is higher than it is at low pressure. Third, the instant surface temperature rises first then falls during braking and the mean surface temperature rises continuously with the braking pressure increasing. Originality/value -It is found that the increasing of braking pressure within a certain range is helpful for achieving a high friction coefficient and a steady wear rate. But too high pressure will cause contrarily the falling of frictional performance and serious of wear performance. So it is not reliable to rise the braking pressure without limited during emergency braking.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of braking pressure on tribological performance of non‐asbestos brake shoe for mine hoister during emergency braking

Bao

Zhu

Tong

et al. 2012

Industrial Lubrication and Tribology

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“…This is a large force which is applied on both sides and the temperature of this friction can rise up to 700°C (Entezami et al, 2012; Stiesdal, 1999). Temperature sensors can be used to prevent overheating of the pads and disc by disengaging and engaging the callipers when the temperatures exceed the threshold (Jepsen et al, 2010; Wang et al, 2012).…”

Section: Of the Mechanical Drive Train Componentsmentioning

confidence: 99%

Perspectives on condition monitoring techniques of wind turbines

et al. 2018

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The ever-increasing development of wind power plants has raised awareness that an appropriate condition monitoring system is required to achieve high reliability of wind turbines. In order to develop an efficient, accurate and reliable condition monitoring system, the operations of wind turbines need to be fully understood. This article focuses on the online condition monitoring of electrical, mechanical and structural components of a wind turbine to diminish downtime due to maintenance. Failure mechanisms of the most vulnerable parts of wind turbines and their root causes are discussed. State-of-the-art condition monitoring methods of the different parts of wind turbine such as generators, power converters, DC-links, bearings, gearboxes, brake systems and tower structure are reviewed. This article addresses the existing problems in some areas of condition monitoring systems and provides a novel method to overcome these problems. In this article, a comparison between existing condition monitoring techniques is carried out and recommendations on appropriate methods are provided. In the analysis of the technical literature, it is noted that the effect of wind speed variation is not considered for traditional condition monitoring schemes.

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“…Several scholars have carried out studies on the friction and wear behaviors of brake shoes during emergency braking ignoring vibration. Wang et al [7] discussed the effect of a temperature rise on the coefficient of friction between the brake disc and the brake shoe. Bao et al [8] explored the effect of braking pressure on the friction and wear properties of the brake shoe.…”

Section: Introductionmentioning

confidence: 99%

Effect of Vibration on Emergency Braking Tribological Behaviors of Brake Shoe of Deep Coal Mine Hoist

Wang

et al. 2021

Applied Sciences

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The effects of vibration on the emergency braking tribological behaviors of the brake shoe of a deep coal mine hoist were investigated in this study. The thermal, frictional and mechanical parameters of the brake shoe were obtained. The vibration characteristics of the brake shoe during emergency braking were investigated, employing multibody dynamics analysis. The effect of vibration on the emergency braking tribological behaviors (temperature and stress distributions) of brake interfaces was explored using the finite element method. The self-made tribo-brake test rig of a brake shoe was employed to reveal the friction deterioration behaviors of the brake shoe during emergency braking. The results show obvious vibrations of all brake shoes along the direction of positive braking pressure during emergency braking. The vibration causes increases in the equivalent Von Mises stress and temperature at the contact interfaces between the brake disc and the brake shoe as compared to the case of ignoring the vibration. Along the rotation direction of the brake disc, the equivalent stress and temperature of the brake disc surface present three overall rapid increases, as well as two slight decreases during emergency braking. As compared to cyclic emergency braking, continuous emergency braking exhibits more obvious tribological degradation of the brake shoe, attributed to enhanced vibration. The wear loss of the brake shoe increases with increasing emergency braking cycles and continuous emergency braking time.

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Study on the Influence of the Temperature Rise and Frictional Coefficient of Brake Shoe on Braking of Wind Turbine

Cited by 3 publications

References 1 publication

Influence of braking pressure on tribological performance of non‐asbestos brake shoe for mine hoister during emergency braking

Influence of braking pressure on tribological performance of non‐asbestos brake shoe for mine hoister during emergency braking

Perspectives on condition monitoring techniques of wind turbines

Effect of Vibration on Emergency Braking Tribological Behaviors of Brake Shoe of Deep Coal Mine Hoist

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