On the minimal model for the low frequency wobbling instability of friction discs

Fidlin, Alexander; Drozdetskaya, Olga; Waltersberger, Bernd

doi:10.1016/j.euromechsol.2011.03.009

Cited by 20 publications

(17 citation statements)

References 15 publications

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“…Fidlin et al [31] presented a numerical study of friction disc wobbling dynamics, simulating the clutch disc and pressure plate assembly. A two-dof model was developed including the input shaft.…”

Section: List Of Symbols Cmentioning

confidence: 99%

Automotive dry clutch fully coupled transient tribodynamics

et al. 2021

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Determining the root causes of Noise, Vibration and Harshness (NVH) phenomena in modern automotive drivetrains is a task of critical importance. This research investigates the stability of dry clutch systems vibrational behaviour during engagement. A fully coupled dry clutch numerical model including the influence of friction is presented and validated using vehicle measurements. The clutch component frictional properties are measured using parts that exhibit aggressive NVH behaviour using representative tribometric experiments. The validated numerical tool highlights the occurrence of instabilities which are caused by modal couplings, particularly between the input shaft bending and clutch disc radial motions. Such a validated transient dynamics model of a dry clutch system has not hitherto been presented in the open literature.

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Section: List Of Symbols Cmentioning

confidence: 99%

Automotive dry clutch fully coupled transient tribodynamics

et al. 2021

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“…A minimal model to explain this effect in mechanical systems with friction is investigated in [6]. For clutch systems, a mode-coupling flutter instability has been studied in [5] and in [3]. The unstable modes correspond to the wobbling of the clutch disc on the pressure plate.…”

Section: Introductionmentioning

confidence: 99%

Friction induced vibrations in shift gearboxes

Jehle

Fidlin

2014

Z Angew Math Mech

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In shift gearboxes, audible vibrations can arise during the process of clutch engagement. Measurements show an unstable axial motion of the gear unit input shaft. In order to explain this effect, an approach which establishes the interaction of the slipping clutch and the gearing is proposed. The suggested model consists of a pressure plate, a clutch disc, a gear unit input shaft and a tooth contact. The gear unit input shaft is rigidly connected to the gearing and the clutch disc and has translational and rotational degrees of freedom. The tooth contact imposes a kinematic constraint on the system. This is why the sliding friction torque is transformed into forces in axial and radial direction of the shaft. Depending on the gearing parameters and the slip, the contact normal force between clutch disc and pressure plate is amplified (motor accelerating) or reduced (motor slowing down) by the toothing. For both shifting situations, a region of flutter instability in the parameter space can be found. The dynamic behavior of the system with parameters in the latter region is analyzed. It is shown that there exists a stable piecewise-continuous limit cycle: During one period, the contact between the clutch disc and the pressure plate opens shortly. A variation of parameters is performed to show the dependence of the limit cycle on the geometry and on the operation conditions.

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“…Moreover, the pressure plate's stiffness and inertia affect the system vibrations. Fidlin [8] conducted a numerical study on dry clutch friction disc dynamic behaviour. A clutch system model with gyroscopic terms and friction induced damping was used for stability analysis.…”

Section: Introductionmentioning

confidence: 99%

Influence of Clutch Tribodynamics on Drivetrain Noise, Vibration and Harshness, (NVH), Phenomena

Minas¹,

Morris²,

Theodossiades³

et al. 2018

SAE Technical Paper Series

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Limiting problematic Noise, Vibration and Harshness (NVH) phenomena in the modern automotive drivetrain is a task of critical importance. The result of such phenomena is the aggravation of the driver, which results in a reduced perception of vehicle quality. Each phenomenon can be characterized by a distinct frequency range. The aim of the current study is to assess the influence of the interfacial frictional behavior of the dry friction clutch components on the drivetrain dynamic behavior. The dynamics of the system (in terms of its stability) are studied. Surface data from the clutch components are critical to understanding the complex engagement process. The coefficient of friction was measured using a rotary tribometer at representative slip speeds and contact pressures. To aid the analysis infinite focus microscopy was used to measure the geometric properties of the constituent components of the drivetrain. The current approach allows for improved understanding of the drivetrain's dynamic behavior. The improved understanding of the coupling between tribological characteristics and drivetrain system dynamics can lead to the mitigation of future NVH issues.

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On the minimal model for the low frequency wobbling instability of friction discs

Cited by 20 publications

References 15 publications

Automotive dry clutch fully coupled transient tribodynamics

Automotive dry clutch fully coupled transient tribodynamics

Friction induced vibrations in shift gearboxes

Influence of Clutch Tribodynamics on Drivetrain Noise, Vibration and Harshness, (NVH), Phenomena

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