Vibration Reduction in a Variable Displacement Engine Using Pendulum Absorbers

Nester, Tyler M.; Haddow, Alan G.; Shaw, Steven W.; Brevick, John E.; Borowski, Victor J.

doi:10.4271/2003-01-1484

Cited by 37 publications

(14 citation statements)

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“…When these loops touch the |y| = 1 limits, a grazing bifurcation takes place that dramatically alters the qualitative nature of the response [21]. 5 Note that the response immediately after the grazing bifurcation is chaotic, and involves a number of small excursions near the barriers. In fact, some of these responses involve chatter, that is, the motion undergoes repetitive impacts of continually smaller velocity such that the absorber actually becomes stuck at the barrier in finite time and remains there for a duration.…”

Section: System Response and Absorber Performancementioning

confidence: 99%

“…Order-tuned absorbers are widely used in rotating machinery, primarily to attenuate torsional vibrations that arise from fluctuating torsional loads. For example, they have a rich history in piston aircraft engines [4], and have more recently been proposed as a method for handling vibrations in advancedtechnology automotive engines [5]. In these applications, the absorbers typically consist of masses suspended from the rotor using a bifilar suspension, such that their center of mass travels along a given path (usually circular) relative to the rotor.…”

Section: Introductionmentioning

confidence: 99%

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The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

Shaw

Pierre

2005

Journal of Computational and Nonlinear Dynamics

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This paper describes an analytical investigation of the dynamic response and performance of impact vibration absorbers fitted to flexible structures that are attached to a rotating hub. This work was motivated by experimental studies at NASA, which demonstrated the effectiveness of these types of absorbers for reducing resonant transverse vibrations in periodically excited rotating plates. Here we show how an idealized model can be used to describe the essential dynamics of these systems, and used to predict absorber performance. The absorbers use centrifugally induced restoring forces so that their nonimpacting dynamics are tuned to a given order of rotation, whereas their large amplitude dynamics involve impacts with the primary flexible system. The linearized, nonimpacting dynamics are first explored in detail, and it is shown that the response of the system has some rather unique features as the hub rotor speed is varied. A class of symmetric impacting motions is also analyzed and used to predict the effectiveness of the absorber when operating in its impacting mode. It is observed that two different types of grazing bifurcations take place as the rotor speed is varied through resonance, and their influence on absorber performance is described. The analytical results for the symmetric impacting motions are also used to generate curves that show how important absorber design parameters—including mass, coefficient of restitution, and tuning—affect the system response. These results provide a method for quickly evaluating and comparing proposed absorber designs.

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Section: System Response and Absorber Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

Shaw

Pierre

2005

Journal of Computational and Nonlinear Dynamics

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“…Among the interesting features of these systems are the possibilities of instabilities that arise when multiple identical absorbers are employed (132) - (134) , impact responses (135) , and superharmonic resonances (136) . There have been very recent applications to automotive engines that employ cylinder deactivation (137) .…”

Section: Journal Of System Design and Dynamicsmentioning

confidence: 99%

A Review of Nonlinear Dynamics of Mechanical Systems in Year 2008

Shaw

Balachandran

2008

JSDD

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In this article, we provide an overview of a selection of topics of current interest in nonlinear dynamics and vibrations of mechanical systems. Specifically, we cover the traditional topics of structural dynamics, rotating systems, vibration control, vehicle dynamics, and machining, as well as some topics that have emerged more recently, namely micro-and nano-electromechanical systems, piecewise smooth systems, and structural health monitoring and system identification. In the introductory and closing sections, we offer our perspective on the state of affairs in nonlinear dynamics and its utility in the study of mechanical systems.

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“…Pendulum absorbers have been in use over half a century, however, they still continue to be used in new applications, which experience severe torsional vibrations. Pendulum absorbers have some tempting features for applications; since they can be tuned to a given order of rotation rather than to a set frequency and therefore they are effective over a continuous range of rotating speeds [12], also including the fact that they dissipate very little energy, in addition; they can often designed such that no mass or rotating inertia is added to the crank shaft as achieved by Nester et al [13] in automotive applications by replacing existing counterweights by CPVAs, which then serve for both balancing and torsional vibration reduction.…”

Section: Introductionmentioning

confidence: 99%

Analytical Investigations of the Gravity Effect on the Dynamics and Performance of Centrifugal Pendulum Vibration Absorber

Abouobaia

Bhat

2014

The International Conference on Applied Mechanics and Mechanica

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Centrifugal Pendulum Vibration Absorber (CPVA) has been effectively used in rotating and reciprocating machines to control torsional vibrations passively. This research presents results from analytical investigation of rotor systems integrated with CPVA. The system under investigation is modeled as a rotating disk attached with CPVA in which the disk is subjected to an external simple harmonic torque. Mathematical model of a rotor fitted with a CPVA has been formulated and the equations of motion are derived using Lagrange principle. The effect of gravity due to CPVA operating in a vertical plane with a horizontal shaft has been considered in the formulation. The results are also compared with those based on CPVA operating in a horizontal plane in which the effect of gravity has been neglected. Moreover, softening nonlinear behavior of the pendulum and its effect on the natural frequency of the system has been investigated. KEY WORDSTorsional vibration absorber, CPVA, gravity effect, softening behavior. * Graduate student,

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Vibration Reduction in a Variable Displacement Engine Using Pendulum Absorbers

Cited by 37 publications

References 4 publications

The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

A Review of Nonlinear Dynamics of Mechanical Systems in Year 2008

Analytical Investigations of the Gravity Effect on the Dynamics and Performance of Centrifugal Pendulum Vibration Absorber

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