The centrifugal pendulum-type absorber

Zink, Matthias; Hausner, Markus

doi:10.1007/bf03225088

Cited by 12 publications

(4 citation statements)

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“…13 A speed-adaptive absorber to overcome the torsional vibrations with speed has been investigated by Zink and Hausner. 14 Haris et al 15 presented a numerical study of a system comprising passive devices as Nonlinear Energy Sinks to attenuate the torsional oscillations in an extended frequency range under transient vehicle manoeuvres. Moreover in Haris et al 16 various classes of Nonlinear Energy Sinks have been evaluated.…”

Section: Introductionmentioning

confidence: 99%

Gear Rattle during a start-up transient in a driveline equipped with a tuneable torsional Vibration Damper with Magneto-Rheological Elastomers

Rocca¹,

Russo²

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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The paper reports a numerical investigation on the dynamic behaviour of a vehicle driveline, equipped with a Torsional Vibration Damper (TVD) based on Magneto-Rheological Elastomeric (MRE) spring elements, during the start-up transient considering an abrupt manoeuvre of clutch engagement. The TVD device consists of a flywheel and a damper disk, with interposed some elastomeric samples which react for relative angular displacements of the two disks. The dynamical parameters of the TVD can be properly tuned by varying the magnetic field surrounding the MRE springs to mitigate the torsional oscillations of the flywheel, causes of many undesired inconveniences as critical speeds or vibro-acoustic issues. The present study promotes the use of the MRE torsional vibration damper to reduce the annoying vibroacoustic phenomenon of “gear rattle” arising in the unloaded gear pairs of the gear box, during and after the rapid clutch engagement transients in the vehicle start-up phase and is conducted on a simplified automotive driveline equipped with a dry clutch. The possibility of quickly tuning the mechanical properties of the MRE-TVD, makes this device particularly eligible for suppressing the above disturbance, adapting to the various operative conditions of the automotive driveline. Results of the analysis, by the help of a Gear Rattle Index (GRI), demonstrate the effectiveness of the proposed device in reducing the vibroacoustic phenomenon during the transient phases of the vehicle start-up, until the vehicles speed conditions are reached.

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Section: Introductionmentioning

confidence: 99%

Gear Rattle during a start-up transient in a driveline equipped with a tuneable torsional Vibration Damper with Magneto-Rheological Elastomers

Rocca¹,

Russo²

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…A torsional vibration damper (TVD), interposed between the engine and gear box, can be of help by attenuating the speed fluctuations of the shaft and the angular accelerations in gear pinions, reducing the tooth impacts intensity that is the major source of annoying noises. 7–13…”

Section: Introductionmentioning

confidence: 99%

“…5 A dual-mass flywheel, today widely diffused in automotive transmissions, is constituted by two disks connected by circumferential springs that reduce the engine irregularities, as reported by Theodossiades et al 6 A torsional vibration damper (TVD), interposed between the engine and gear box, can be of help by attenuating the speed fluctuations of the shaft and the angular accelerations in gear pinions, reducing the tooth impacts intensity that is the major source of annoying noises. [7][8][9][10][11][12][13] A totally new approach to the attenuation of torsional vibrations in drive lines is offered today by the wide diffusion of ''smart materials'' such as magnetorheological (MR) materials.…”

Section: Introductionmentioning

confidence: 99%

Gear rattle reduction in an automotive driveline by the adoption of a flywheel with an innovative torsional vibration damper

Brancati¹,

Rocca²,

Russo

2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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An innovative device consisting of a flywheel equipped with a torsional vibration damper, based on the magnetorheological effect in elastomeric spring elements, is proposed in this paper. The feasibility study reports the dynamic behaviour of an automotive driveline equipped with the device aiming to explore the effectiveness of the damper in reducing the torsional oscillations of the flywheel, at low-speed regime, responsible for the vibro-acoustic phenomenon known as “gear rattle”. The spring elements of the device are constituted by magneto-rheological elastomeric samples, interposed between the flywheel and the damper disk, working for shear strains. Their dynamical characteristics can be properly tuned by varying the magnetic field surrounding the springs in order to mitigate the forced vibration causes of gear tooth impacts. The good attitude of the device in mitigating the rattle phenomenon is demonstrated by comparing the results provided by a numerical drive line model, equipped with a “monolithic” flywheel, with those obtained by adopting the present innovative vibration damper. The angular accelerations, resulting from the collisions between the teeth during the operation under “idle” conditions at different angular speeds, are thus compared.

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confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Grega

Homišin

2021

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Several approaches are typically used to reduce torsional vibrations in mechanical systems with piston-driven engines [14,15]. Various types of f lexible couplings and dual-mass f lywheels are widely implemented [16][17]. It has been demonstrated that pneumatic tuners with adjustable torsional stiffness can be used to achieve active tuning of torsional vibrations [19][20][21][22][23]. Certain research ventures have focused on the application of nonlinear energy sink (NES) [24] and targeted energy transfer (TET) [25] with the goal of designing a device with quasi-zero torsional stiffness [26]. These research avenues require new approaches to solving analytical models. It is common practice in engineering that complicated systems are simplified -e.g. nonlinear systems are often linearised around an operating point. While in some cases linearisation is adequate as demonstrated in [27][28][29], there are applications that require nonlinear models because linearisation either does not provide sufficient accuracy, or is not possible at all [30].The first step in extending the linear model is the addition of a cubic term. Such a system, governed by the Duffing equation, has been the subject of numerous analyses [31]. Extensive mathematical tools have been developed to model the system, whether the nonlinearity is weak or strong.In this presented work, we decided to focus on a different type of a nonlinear system. Systems with power-law restoring force have not been extensively studied, in spite of the fact that they may occur naturally in many engineering problems. The source of nonlinearity can be contact law, such as Hertzian potential, for which restoring force f varies with displacement q as f ∝ q 1.5 . Further examples include systems without pre-tension or systems tuned to zero stiffness around the operating point. If the force-carrying medium is gas, such as in the pneumatic tuners [18], the restoring force is also inherently nonlinear with power-law dependence.

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The centrifugal pendulum-type absorber

Cited by 12 publications

References 1 publication

Gear Rattle during a start-up transient in a driveline equipped with a tuneable torsional Vibration Damper with Magneto-Rheological Elastomers

Gear Rattle during a start-up transient in a driveline equipped with a tuneable torsional Vibration Damper with Magneto-Rheological Elastomers

Gear rattle reduction in an automotive driveline by the adoption of a flywheel with an innovative torsional vibration damper

Bulletin of the Polish Academy of Sciences: Technical Sciences

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