A thermal boundary control method for a flexible thin disk rotating over critical and supercritical speeds

Pei, Yong-Chen; Chatwin, Chris; He, Lei; Li, Wenzuo

doi:10.1007/s11012-016-0418-y

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…As is customary in such studies, it is assumed that the sliding velocity reduces linearly with respect to the interfacial slip time, [22]. This is expressed in equation (9). In all cases, the sliding time (time of engagement process/clutch pedal actuation), , was set to 0.5 seconds.…”

Section: Friction and Thermal Measurementsmentioning

confidence: 99%

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Heat generation and transfer in automotive dry clutch engagement

Gkinis

Rahmani

Rahnejat

et al. 2018

J. Zhejiang Univ. Sci. A

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Dynamic behaviour of automotive dry clutches depends on the frictional characteristics of the contact between the friction lining material, the flywheel and the pressure plate during the clutch engagement process. During engagement due to high interfacial slip and relatively high contact pressures, generated friction gives rise to contact heat, which affects the material behaviour and the associated frictional characteristics. In practice excess interfacial slipping and generated heat during torque transmission can result in wear of the lining, thermal distortion of the friction disc and reduced useful life of the clutch. This paper provides measurement of friction lining characteristics for dry clutches for new and worn state under representative operating conditions pertaining to interfacial slipping during clutch engagement, applied contact pressures and generated temperatures. An analytical thermal partitioning network model of the clutch assembly, incorporating the flywheel, friction lining and the pressure plate is presented, based upon the principle of conservation of energy. The results of the analysis show a higher coefficient of friction for the new lining material which reduces the extent of interfacial slipping during clutch engagement, thus reducing the frictional power loss and generated interfacial heating. The generated heat is removed less efficiently from worn lining. This might be affected by different factors observed such as the reduced lining thickness and the reduction of density of the material but mainly due to poorer thermal conductivity due to the depletion of copper particles in its microstructure as the result of wear. The study integrates frictional characteristics, microstructural composition, mechanisms of heat generation, effect of lining wear and heat transfer in a fundamental manner, an approach not hitherto reported in literature.

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Section: Friction and Thermal Measurementsmentioning

confidence: 99%

“…The changes in the friction characteristics of the clutch lining can lead to a greater propensity to judder [4][5][6][7]. Distortion of the friction disc causes its uneven contact with the pressure plate and the flywheel, resulting in localised contacts, the hot-spotting phenomenon [8] and thermoelastic instability [9].…”

Section: Introductionmentioning

confidence: 99%

Heat generation and transfer in automotive dry clutch engagement

Gkinis

Rahmani

Rahnejat

et al. 2018

J. Zhejiang Univ. Sci. A

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A thermal stress stiffening method for vibration suppression of rotating flexible disk with mass-spring-damper system loaded

Yang

Pei

2022

International Journal of Mechanical Sciences

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Finite element analysis of the thermal and thermo-mechanical coupling problems in the dry friction clutches using functionally graded material

Jabbar,

Hussain,

Abdullah

et al. 2024

Curved and Layered Structures

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The friction clutch is an important machine part in the torque transmission system, where it is responsible for gently transmitting the power from the engine to the gearbox and damping the tensional vibration. At the beginning of the engagement between the clutch’s elements, a large amount of heat is released due to frictional sliding between the elements of the clutch system, generating very high temperatures. In this work, the two- and three-dimensional finite element models were developed from scratch to explore the clutch disk’s temperature and contact pressure behaviors using an alternative frictional material such as functionally graded material (FGM). The two assumptions for the thermal loads were considered: uniform wear and uniform pressure assumptions. The thermal–structural problem for the new frictional material was solved numerically and then presented as the temperature distributions and the contact pressure at any instant of sliding time. Also, a comparison was made between the clutch system behaviors when using FGM with different frictional materials. The results showed that the FGM has superior results to the other available frictional materials.

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A thermal boundary control method for a flexible thin disk rotating over critical and supercritical speeds

Cited by 3 publications

References 38 publications

Heat generation and transfer in automotive dry clutch engagement

Heat generation and transfer in automotive dry clutch engagement

A thermal stress stiffening method for vibration suppression of rotating flexible disk with mass-spring-damper system loaded

Finite element analysis of the thermal and thermo-mechanical coupling problems in the dry friction clutches using functionally graded material

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