Modeling and analysis of friction clutch at a driveline for suppressing car starting judder

Li, Liping; Lu, Zhaijun; Liu, Xuelai; Sun, Tao; Jing, Xingjian; Shangguan, Wen‐Bin

doi:10.1016/j.jsv.2018.03.011

Cited by 39 publications

(31 citation statements)

References 14 publications

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“…This simplification is common in literature for analyses of powertrain torsional dynamics in smaller vehicles and has shown to give good correlation with measurements. 12–16 The validity of this approach is also supported by the fact that the secondary flywheel of a DMF is typically only loosely connected in transverse direction to the primary flywheel. 17…”

Section: Numerical Simulationsmentioning

confidence: 98%

Dual-mass flywheels with tuned vibration absorbers for application in heavy-duty truck powertrains

Wramner

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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As the heavy-duty combustion engine development goes towards lower rotational speeds and higher cylinder pressures, the torsional vibrations increase. There is therefore a need to identify and study new types of vibration absorbers that can reduce the level of torsional vibrations transmitted from the engine to the gearbox. In this work, the concept of a dual-mass flywheel combined with a tuned vibration absorber is analysed. The tuned vibration absorber efficiently reduces the vibration amplitudes for engine load frequencies near the tuning frequency, but it also introduces an additional resonance into the system. By placing the tuned vibration absorber on an intermediate flange between the two dual-mass flywheels, the introduced resonance frequency will be lower than the tuning frequency and a resonance in operating engine speed range can be avoided. Numerical simulations are used to show how the torsional vibration amplitudes in a heavy-duty truck powertrain are affected by the tuned vibration absorber and how the different parameters of the tuned vibration absorber and the dual-mass flywheel affect the torsional vibrations and the resonance frequencies.

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Section: Numerical Simulationsmentioning

confidence: 98%

Dual-mass flywheels with tuned vibration absorbers for application in heavy-duty truck powertrains

Wramner

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Many researchers have studied the effect of external excitation including engine torque fluctuation, road excitation and dynamic characteristics of the clutch actuator on self-excited vibration [4], [13]- [15], [17], [19]. For dry clutch, the influence of the clutch torsional spring stiffness and the axial cushion spring stiffness on vibration were analyzed [18], [19], and for wet clutch, the influence of the pressure fluctuation and the ATF (Automatic transmission fluid) quality degradation on vibration was investigated [4], [20].…”

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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“…The mathematical description of friction phenomenon is crucial to the modeling of clutch friction torque. The Stribeck friction model or its linear simplified model, static friction model, was used to find the relationship between frictional coefficient and relative velocity in the works of Mashadi and Badrykoohi 13 and Li et al 14 Due to the unsteady-state properties of the clutch engagement process, the analysis of instantaneous microcosmic process is required to obtain accurate clutch friction torque, which can be achieved by a dynamic friction model. Dahl model 15 was the first dynamic friction model to describe pre-sliding displacement of micro-scale bristles.…”

Section: Introductionmentioning

confidence: 99%

Mechanism analysis of vehicle start-up judder based on gradient characteristic of Stribeck effect

Yuan

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a profound mechanism investigation for vehicle start-up judder phenomenon using a combination of experiment and simulation. First, from the experimental analysis, the characteristic frequency of start-up judder is mainly concentrated at about 9 Hz. A 13-degree-of-freedom powertrain branched model is established to numerically reproduce experimental phenomenon. The validity and accuracy of simulation model in reflecting the characteristics of start-up judder are verified by the experimental results in time–frequency domain. Second, through analyzing clutch friction torque, it can be concluded that the closed-loop positive feedback mechanism caused by the negative gradient characteristic of Stribeck effect is the determining factor for the start-up judder. It promotes aggravated fluctuation in rotational speed of clutch driven plate. The introduction process of negative damping that makes powertrain system divergent is explained in detail. Finally, two theoretical measures are proposed to suppress the vehicle start-up judder. One of the measures is to diminish the absolute value of the negative gradient. It weakens the aggravation effect of the closed-loop positive feedback and hence attenuates the start-up judder. Another measure is to change to positive gradient. It forms a closed-loop negative feedback process that causes the almost disappearance of start-up judder. The effectiveness of the two suppression measures verifies the correctness of the start-up judder mechanism proposed in this paper.

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Modeling and analysis of friction clutch at a driveline for suppressing car starting judder

Cited by 39 publications

References 14 publications

Dual-mass flywheels with tuned vibration absorbers for application in heavy-duty truck powertrains

Dual-mass flywheels with tuned vibration absorbers for application in heavy-duty truck powertrains

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

Mechanism analysis of vehicle start-up judder based on gradient characteristic of Stribeck effect

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