Tautochronic Vibration Absorbers for Rotating Systems

Shaw, Steven W.; Schmitz, Peter M.; Haddow, Alan G.

doi:10.1115/1.2338652

Cited by 51 publications

(22 citation statements)

References 11 publications

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“…The absorbers used in this study have been used previously for studies of steady state responses, which considered single and multiabsorber systems, and were used to validate perturbation analytical results for general path absorbers [2][3][4] and near tautochronic path absorbers [5]. Previous studies considering the transient dynamics of pendulum vibration absorbers include simulations for circular path absorbers [6] and analytical closed-form results for damped linear absorbers [7], which closely approximate the results for near tautochronic absorbers.…”

Section: Introductionmentioning

confidence: 92%

Nonlinear Transient Dynamics of Pendulum Torsional Vibration Absorbers—Part II: Experimental Results

Monroe

Shaw

2013

Journal of Vibration and Acoustics

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This paper presents results from an experimental investigation of the transient response of centrifugal pendulum vibration absorbers, including a comparison with the analytical results derived in the companion paper, Part I. The focus of the study is the overshoot experienced by pendulum-type torsional vibration absorbers when a rotor running at a constant speed is suddenly subjected to an applied fluctuating torque. The experiments are carried out using a fully instrumented spin rig controlled by a servo motor that can provide user-specified engine order disturbances, including those that simulate automotive engine environments. The absorber overshoot depends on the absorber tuning relative to the excitation order, the absorber damping, the amplitude of the applied torque, and on the system nonlinearity, which is set by the absorber path and/or kinematic coupling between the rotor and the absorber. Two types of absorbers are used in the study, a simple circular path pendulum, for which the path nonlinearity is dominant, and a nearly tautochronic path pendulum with a bifilar support, for which the path and coupling nonlinearities are both small. It is found that the experimental results agree very well with the analytical predictions from the companion paper. In addition, it is confirmed that the general path pseudoenergy prediction (which depends on a single parameter) provides a useful, conservative upper bound for most practical absorber designs, provided the absorber damping is small.

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Section: Introductionmentioning

confidence: 92%

Nonlinear Transient Dynamics of Pendulum Torsional Vibration Absorbers—Part II: Experimental Results

Monroe

Shaw

2013

Journal of Vibration and Acoustics

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“…Civil engineering applications include: the roller damper [30,31] and the ball-type absorber [32,33] by Legeza, the tuned cradle damper by Malla et al [34], the tuned rotary-mass damper by Obata et al [35], the mass-uncertain rolling-pendulum TMD by the authors [29]. Mechanical engineering applications include: the centrifugal pendulum vibration absorbers by Madden [36] and by Shaw et al [37]. And yet, all said citations deal with planar (2-D) RPTMDs, constrained to roll in a vertical plane along a planar profile, and therefore capable of absorbing vibratory energy in one direction of the main structure only.…”

Section: Introductionmentioning

confidence: 99%

A new passive rolling‐pendulum vibration absorber using a non‐axial‐symmetrical guide to achieve bidirectional tuning

Matta

Stefano

Spencer

2009

Earthq Engng Struct Dyn

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SUMMARYA new, passive, vibroprotective device of the rolling-pendulum tuned mass damper type is presented that, relying on a proper three-dimensional guiding surface, can simultaneously control the response of the supporting structure in two mutually orthogonal horizontal directions. Unlike existing examples of ball vibration absorbers, mounted on spherical recesses and effective for axial-symmetrical structures, the new device is bidirectionally tuneable, by virtue of the optimum shape of the rolling cavity, to both fundamental structural modes, even when the corresponding natural frequencies are different, in such a case recurring to an innovative non-axial-symmetrical rolling guide.Based on Appell's non-holonomic mechanics, a non-linear dynamic model is first derived for the bidirectional absorber mounted on a 1-storey 3-degrees-of-freedom linear structure translating under the effect of both imparted base motion and applied dynamic forces. A laboratory-scaled prototype of the device is then tested to experimentally demonstrate the bidirectional tuning capability and to validate the mathematical model. The design procedure and the seismic performance of the absorber are finally exemplified through numerical simulation.

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“…Hatwal et al (1983) focused on the dynamic analysis of similar model considering a small-amplitude oscillation of the free mass which is different from this work. Shaw et al (2006) presented an analytical investigation of centrifugal pendulum vibration absorber called tautochronic vibration absorbers for reducing torsional vibrations in rotating systems following the specified paths.…”

Section: Introductionmentioning

confidence: 99%

A new energy harvest system with a hula-hoop transformer, micro-generator and interface energy-harvesting circuit

Chao

Shao

et al. 2011

Microsyst Technol

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This study presents a synthesis of a new energy harvest system that consists of a hula-hoop transformer, a micro-generator and an interface energy harvest circuit. The hula-hoop transformer mainly comprises a main mass sprung in one translational direction and a free-moving mass attached at one end of a rod, the other end of which is hinged onto the main mass. The transformer is capable of transforming linear reciprocating motions to rotary ones based on the concepts similar to the hula hoop motions. The transformer is subsequently integrated with a miniaturized rotary generator in size of 10 9 10 9 2 mm 3 and its compact energy harvest circuit chip. The designed generator consists of patterned planar copper coils and a multi-polar hard magnet ring made of NdFeB. The genetic algorithm (GA) is next applied to optimize the critical dimensions of the miniaturized generator. The optimized generator offers 4.5 volt and 7.23 mW in rms at 10,000 rpm. With microgenerator successfully fabricated, a novel energy harvest circuit employing a new dual phase charge pump, power management circuit, a low dropout regulator and battery charger is designed and fabricated via the 0.35 lm process. This charge pump circuit owns the merit of automatic conversion of low-power AC signals by the micro-generator to DC ones. Experiments were conducted to show the favorable performance of the proposed energy harvest system. This is the first work that invents a motion transformer from ubiquitous reciprocating to rotational motions. In this way, higher-efficient energy conversion via compact-sized rotational electromagnetic generators can be realized as opposed to popular piezoelectric structures.

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Tautochronic Vibration Absorbers for Rotating Systems

Cited by 51 publications

References 11 publications

Nonlinear Transient Dynamics of Pendulum Torsional Vibration Absorbers—Part II: Experimental Results

Nonlinear Transient Dynamics of Pendulum Torsional Vibration Absorbers—Part II: Experimental Results

A new passive rolling‐pendulum vibration absorber using a non‐axial‐symmetrical guide to achieve bidirectional tuning

A new energy harvest system with a hula-hoop transformer, micro-generator and interface energy-harvesting circuit

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