Non-linear multi-body dynamic analysis for the study of clutch torsional vibrations (judder)

Centea, Dan; Rahnejat, Homer; Menday, M.T.

doi:10.1016/s0307-904x(00)00051-2

Cited by 108 publications

(98 citation statements)

References 9 publications

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“…These vibrations are known as judder and appear in the frequency range 5-20 Hz [7,8]. As the inertia of the vehicle reduces the judder frequency increases.…”

Section: Resultsmentioning

confidence: 99%

“…The friction torque for each surface is defined separately due to different contact timing in the presence of translational motion of the plates. is the friction coefficient and the equivalent radius is determined using uniform pressure assumption between the contacting surfaces (equation 5), thus [7,8]:…”

Section: Tribology Of Clutch Liningsmentioning

confidence: 99%

“…The accuracy of the model increases, when including the inertia of all rotating components inside the clutch pack [5]. A clutch model is occasionally integrated with other driveline components such as the gearbox and differential to investigate the effect of clutch dynamics on gear backlash, driveline NVH, drive quality and gear shifting control [6][7][8][9][10]. In these models, the torsional dynamics is the focus of investigations for torque transfer purposes.…”

Section: Introductionmentioning

confidence: 99%

“…In these models, the torsional dynamics is the focus of investigations for torque transfer purposes. The effect of translational motion of the plates on the engagement time is usually neglected, except when dealing with noise and vibration issues in clutch engagement process, such as clutch take-up judder [5,7,8] and clutch in-cycle vibration [11,12]. In heavy-duty vehicles, clutches comprise multi-discs, thus the translational motion of the plates influence the engagement initiation time.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tribodynamics of a New De-Clutch Mechanism Aimed for Engine Downsizing in Off-Road Heavy-Duty Vehicles

Dolatabadi¹,

Rahmani²,

Theodossiades³

et al. 2017

SAE Technical Paper Series

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Clutches are commonly utilised in passenger type and off-road heavy-duty vehicles to disconnect the engine from the driveline and other parasitic loads. In off-road heavy-duty vehicles, along with fuel efficiency start-up functionality at extended ambient conditions, such as low temperature and intake absolute pressure are crucial. Off-road vehicle manufacturers can overcome the parasitic loads in these conditions by oversizing the engine. Caterpillar Inc. as the pioneer in off-road technology has developed a novel clutch design to allow for engine downsizing while vehicle's performance is not affected. The tribological behaviour of the clutch will be crucial to start engagement promptly and reach the maximum clutch capacity in the shortest possible time and smoothest way in terms of dynamics. A multi-body dynamics model of the clutch system is developed in MSC ADAMS. The flywheel is introducing the same speed and torque as the engine (represents the engine input to the clutch). The hydraulic pressure is applied behind the piston to initiate the engagement. The angular motion of the plates is supported by friction torque between the plates and friction linings. The conjunctions between paper-based linings and steel plates are designed to be dry. Friction (the most significant tribological feature of the linings in torque transmission) is measured in a pin-on-disc tribometer and mapped into the dynamics model in MSC ADAMS. The pin-on-disc tribometer is able to capture the variation of friction coefficient with contact pressure and sliding velocity. The surface topography is obtained experimentally to examine the consistency of surface properties. The normal pressure and tribology of the contacting components determines the engagement time, clutch capacity and dynamic behaviour of the clutch.

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“…These vibrations are known as judder and appear in the frequency range 5-20 Hz [7,8]. As the inertia of the vehicle reduces the judder frequency increases.…”

Section: Resultsmentioning

confidence: 99%

Section: Tribology Of Clutch Liningsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tribodynamics of a New De-Clutch Mechanism Aimed for Engine Downsizing in Off-Road Heavy-Duty Vehicles

Dolatabadi¹,

Rahmani²,

Theodossiades³

et al. 2017

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…It can take place in clutch or brake systems. Stick-slip oscillations are also friction induced (Centea et al, 1999;2001). The second one usually occurs in the frequency range between 1 and 16 kHz.…”

Section: Introductionmentioning

confidence: 99%

Elimination of surface spiral pattern on brake discs

Rodríguez

Lacalle

Fernández

et al. 2014

J. Zheijang Univ.-Sci.

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Nowadays, brake disc manufacturers are seeking new finishing techniques to offer economical solutions to their customers and so become more competitive. The elimination of the surface spiral pattern after turning operation is a challenge to avoid braking problems at the early life of the component. This paper presents a practical low-cost solution to finishing this kind of component. Concretely, a detailed study of the brushing process as an alternative solution to the conventional grinding process is performed. The limited literature regarding this topic implies the necessity of a full study of the process prior to any industrial application. The influence of process variables on the final surface was analyzed in this work. In addition, the tool wear and tool life behavior, the influence of the abrasive type used and the originating forces during the process were taking into account. Once the process was established, various prototypes were finished in order to check the feasibility of the process and to pass the required quality control. Results show that brushing is a feasible and economical alternative for brake disc finishing. The surface quality obtained was shown to be equal or better than grinding, with reduced costs and manufacturing time.

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Drivetrain Noise, Vibration, and Harshness

Rahnejat

Theodossiades

Kelly³

et al. 2014

Encyclopedia of Automotive Engineering

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This chapter describes the plethora of noise, vibration, and harshness ( NVH ) concerns in vehicular drivetrain systems. With a trend toward compact lightweight lightly damped drivetrain systems, such phenomena are likely to exacerbate. Significant NVH concerns such as transmission rattle, driveline clonk, and clutch in‐cycle whoop are described and methods of measurement and modeling are described. These NVH phenomena are regarded as refinement quality issues by vehicle customers, thus a concern to the automobile industry. Various methods of palliation are also discussed.

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Non-linear multi-body dynamic analysis for the study of clutch torsional vibrations (judder)

Cited by 108 publications

References 9 publications

Tribodynamics of a New De-Clutch Mechanism Aimed for Engine Downsizing in Off-Road Heavy-Duty Vehicles

Tribodynamics of a New De-Clutch Mechanism Aimed for Engine Downsizing in Off-Road Heavy-Duty Vehicles

Elimination of surface spiral pattern on brake discs

Drivetrain Noise, Vibration, and Harshness

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