Modelling, Analysis and Simulation of Clutch Engagement Judder and Stick-Slip

Sivanesan, M.; Jayabalaji, G.

doi:10.4271/2016-01-2355

Cited by 8 publications

(10 citation statements)

References 5 publications

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“…The clutch state is determined by the logical judgment of equation (15) and its previous state. During the period of the most severe vibrance, the clutch state is depicted in Figure 17 and switches frequently between 0-sliding state and 1-engaged state, which shows a significant stick-slip motion when Á _ is gradually approaching zero.…”

Section: Simulation Results Of Vehicle Start-up Judder and Its Mechanismmentioning

confidence: 99%

“…Although Sivanesan et al. 15 made up for both their deficiencies mentioned above, the vehicle simulation model established by authors was too simplified to consider factors such as stick-slip friction and clutch maneuvering characteristic. Pisaturo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Although Sivanesan et al 15 made up for both their deficiencies mentioned above, the vehicle simulation model established by authors was too simplified to consider factors such as stick-slip friction and clutch maneuvering characteristic. Pisaturo et al 16 applied model predictive control (MPC) to automatic clutch for automatic mechanical transmission (AMT), and proved the importance of establishing an accurate model about the estimation of clutch friction torque for improving the MPC controller performance.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Yuan

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper presents a detailed investigation of the dry clutch engagement process, and vehicle start-up judder phenomenon that could result in the deterioration of vehicle ride comfort. Elasto-plastic friction model is elaborated through the slider-pulley system, which shows some friction characteristics such as presliding, stick-slip motion, Stribeck effects, etc., and applied to dry clutch. The axial compression characteristics of three elastic parts, which include diaphragm spring, cushion spring, and link strip have been taken into consideration, and nonlinear relationship between the release bearing travel and the clutch clamp force is also established. The powertrain system model of front-engine and front-wheel-drive vehicle equipped with manual transmission is set up to recreate the start-up judder phenomenon in the numerical simulation and analyze its mechanism. The sudden transfer of the engine torque during the clutch engagement process results in the initial judder, which can be supposed as the step response of system and is initially weakened due to the damping of the powertrain system. Then the judder gradually strengthens and gets in the most severe vibrance when the clutch is about to get in to the fully engaged state, which is related to the frictional characteristics that forms a closed-loop positive feedback system, as well as the frequent state transitions between sliding state and engaged state. The positive slope of Stribeck effect as well as the reduction of absolute value of negative slope can both effectively suppress the start-up judder, and the apparent judder occurs only if the negative slope is outside of a certain range, instead of in all of the range. In addition, the fluctuation of clutch clamp force can aggravate the start-up judder, in which a more chaotic oscillation is emerged.

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Section: Simulation Results Of Vehicle Start-up Judder and Its Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Yuan

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Current research studies mostly focus on the self-excited vibration of the vehicle driveline system during clutch engagement, and research on the stick-slip phenomenon mainly focuses on its mechanism. According to [23], [17], the clutch stick-slip phenomenon is influenced by the dynamic characteristic of the system. Research studies on the influence of the external excitation on the stick-slip phenomenon during the vehicle start-up process are scarce.…”

Section: These Two Kinds Of Vibration Cause Torsional Oscillation Inmentioning

confidence: 99%

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Wang

et al. 2020

IEEE Access

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The vibration caused by the friction characteristic of the clutch during the vehicle start-up process has an impact on driveline torsional oscillation. This results in the occurrence of the stick-slip phenomenon which in turn aggravates the torsional oscillation. In this study, the dynamic model of the wet clutch was built and the self-excited vibration and stick-slip phenomenon during clutch engagement were theoretically analyzed and numerically simulated. The vehicle start-up driveline model was then built with consideration of the stiffness of the shafts, the time-varying mesh stiffness of the gear set, and system damping. The start-up process of the vehicle was simulated through the adoption of a constant engine speed control strategy, and the influence of the control and structure parameters on the stick-slip phenomenon during the vehicle start-up process was investigated. The results showed that increasing the relative speed threshold value of the constant engine speed control decreases the likelihood of the occurrence of the clutch stick-slip action, and the shaft stiffness, system damping, and inertia of each component also affect the stick-slip phenomenon during vehicle start-up.

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“…19 Since the fundamental frictional equation is not available, the assumed COF formula concerning the relative velocity is employed to describe the tribological performance of friction surfaces. [20][21][22] However, the COF is affected by the contact pressure, surface temperature, velocity, etc. 23,24 If only the velocity is considered, the COF formula is not applicable to analyze the effects of the surface temperature and contact pressure on the clutch judder.…”

Section: Introductionmentioning

confidence: 99%

Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

Kim

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents an investigation of the hot judder behavior in a multi-disc clutch with the uneven contact pressure and the initial temperature taken into account. Considering the actual structure of clutch, the pressure function is achieved to describe the uneven contact pressure distribution due to the circlip constraint. Moreover, the pin-on-disc test is conducted to obtain the formula of the coefficient of friction with the contact pressure, surface temperature, and rotating speed involved. The thermal and dynamic models are established and coupled to evaluate the hot judder behavior. The results demonstrate that the uneven contact pressure has a slight influence on the clutch hot judder, but it expands the radial temperature difference on the friction surface; meanwhile, the friction torque generated on the friction surface closer to the circlip is larger. Although the increase of initial temperature can shorten the clutch engagement time, the clutch hot judder will be shriller, as verified in the SAE#2 bench test. Furthermore, in order to reduce the clutch hot judder, the circlip should be optimized to smooth the radial contact pressure, and the advanced thermal management method should be applied to strengthen the clutch heat dissipation.

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Modelling, Analysis and Simulation of Clutch Engagement Judder and Stick-Slip

Cited by 8 publications

References 5 publications

Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Dynamic analysis of vehicle start-up judder based on elasto-plastic friction model and dry clutch maneuvering characteristic

Study on the Influence Factors Upon the Propensity to Stick-Slip Phenomenon During Vehicle Start-Up Process

Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

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