Coupling of Driveline and Body Vibrations in Trucks

Rabeih, E. M. A.; Crolla, D.A.

doi:10.4271/962206

Cited by 21 publications

(14 citation statements)

References 2 publications

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“…Centea [19] describes a multiple degrees of freedom non-linear dynamic model of a diesel engine light truck clutch system that incorporates the non-linear friction characteristics of the clutch lining and engine torque characteristics. The numerical investigations reported in [19] were instigated by the Ford Motor Company whose extensive on-vehicle observations have shown that judder is a complex phenomenon affected by the gradient of the v-6 characteristics, as also observed in references [12] to [14], [17] and [18]. However, these observations show that although these characteristics play a significant role in judder, they are not a necessary condition for judder to occur, as also observed in references [4] and [15].…”

Section: Introductionmentioning

confidence: 99%

“…Using a dynamic model of the clutch, Jarvis and Oldershaw [16] concluded that judder was a resonance of the system that was excited at the frequency of slipping of the driven plate. Rabeih and Crolla [17,18] developed a mathematical model including torsional vibrations of the driveline, vehicle body fore-aft vibrations and vertical vehicle vibrations and concluded that high values of system damping tend to discourage self-excited vibrations and that a decreasing gradient of friction causes system instability. Centea [19] describes a multiple degrees of freedom non-linear dynamic model of a diesel engine light truck clutch system that incorporates the non-linear friction characteristics of the clutch lining and engine torque characteristics.…”

Section: Introductionmentioning

confidence: 99%

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The influence of the interface coefficient of friction upon the propensity to judder in automotive clutches

Centea

Rahnejat

Menday

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents an investigation of the driveline torsional vibration behaviour, referred to as judder, which takes place during the clutch engagement process, particularly on small trucks with diesel engines. A non-linear multibody dynamic model of the clutch mechanism is employed to study the effect of various clutch system and driveline components on the clutch actuation performance. The paper demonstrates that judder is affected by driveline inertial changes, variation in the coefficient of friction, v, of the friction disc linings with slip speed, 6, and the loss of clamp load. The results of the simulations show that various friction materials with different v-6 characteristics produce torsional self-excited vibrations of the driveline. The results also show that loss of clamp load relating to the speed of clutch actuation also contributes to judder. Furthermore, it is shown that the simulation results conform closely to the experimental findings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of the interface coefficient of friction upon the propensity to judder in automotive clutches

Centea

Rahnejat

Menday

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The modal frequency and mode shape of transmission system during idling condition and driving condition could be got by solving equation (4). Table 1 shows the first six order natural frequencies of transmission system during idling condition; Table 2 shows the first six order natural frequencies of transmission system at 1st-5th gear position.…”

Section: (4)mentioning

confidence: 99%

“…It couples with vehicle longitudinal vibration, transmission bending vibration and drive axle suspension distorted vibration. Therefore, a complex problem of vibration and noise comes out, which has direct impact on vehicle ride comfort and the durability of the parts [1] [2][3] [4]. The transmission torsional vibration reduces significantly using suitable torsional damper.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Performance Parameters of Torsional Vibration Damper Under Various Operating Conditions

Shi

Chen

2013

SAE Int. J. Passeng. Cars - Mech. Syst.

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The performance parameters of torsional vibration damper, including stiffness and damping, have great influence on the torsional vibration of automobile driveline. At present, the research on torsional vibration damper mainly concentrates on the torsional stiffness, but rarely on the torsional damping characteristics. This paper systematically studied the effect of torsional stiffness and damping on torsional vibration of automobile driveline under uniform speed conditions, accelerated and decelerated conditions, idling conditions and resonance conditions. The requirements on stiffness and damping of various operating conditions were summarized. The effect and requirements researched were useful to performance match design of torsional vibration damper.

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“…Flexible couplings with torsional compliance (also known as highly flexible couplings) are used to reduce the transmission of shock loads from one shaft to another and/or to alter the elastodynamic characteristics of the driveline by controlling the natural frequencies of the rotating units. The literature is rich of research works regarding highly flexible couplings, with particular reference to installation in test bench for automotive applications, as in the work of Rabeih and Crolla [1] or Reitz et al [2]. In particular, Gequn et al [3] performed the dynamic analysis of the driveline-including a multibody model of the coupling-in order to estimate the influence of bench installation condition on the engine main bearing load.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Dynamic Analysis of IC Engine Test Beds Equipped with Highly Flexible Couplings

Cocconcelli

Troncossi

Mucchi

et al. 2017

Shock and Vibration

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Driveline components connected to internal combustion engines can be critically loaded by dynamic forces due to motion irregularity. In particular, flexible couplings used in engine test rig are usually subjected to high levels of torsional oscillations and time-varying torque. This could lead to premature failure of the test rig. In this work an effective methodology for the estimation of the dynamic behavior of highly flexible couplings in real operational conditions is presented in order to prevent unwanted halts. The methodology addresses a combination of numerical models and experimental measurements. In particular, two mathematical models of the engine test rig were developed: a torsional lumped-parameter model for the estimation of the torsional dynamic behavior in operative conditions and a finite element model for the estimation of the natural frequencies of the coupling. The experimental campaign addressed torsional vibration measurements in order to characterize the driveline dynamic behavior as well as validate the models. The measurements were achieved by a coder-based technique using optical sensors and zebra tapes. Eventually, the validated models were used to evaluate the effect of design modifications of the coupling elements in terms of natural frequencies (torsional and bending), torsional vibration amplitude, and power loss in the couplings.

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Coupling of Driveline and Body Vibrations in Trucks

Cited by 21 publications

References 2 publications

The influence of the interface coefficient of friction upon the propensity to judder in automotive clutches

The influence of the interface coefficient of friction upon the propensity to judder in automotive clutches

Analysis of Performance Parameters of Torsional Vibration Damper Under Various Operating Conditions

Numerical and Experimental Dynamic Analysis of IC Engine Test Beds Equipped with Highly Flexible Couplings

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