The effects of Coulomb friction on the performance of centrifugal pendulum vibration absorbers

Vidmar, Brendan J.; Feeny, Brian F.; Shaw, Steven W.; Haddow, Alan G.; Geist, Bruce; Verhanovitz, N.

doi:10.1007/s11071-011-0289-7

Cited by 26 publications

(12 citation statements)

References 7 publications

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“…3 Compared to the companion paper [1], the tuning orders here are a bit different, since the experimental absorbers used were set by hardware of the test rig rather than designed to address three-cylinder excitation. 4 The experimental results presented in Ref. [5] were limited in amplitude such that they match very closely those for an exact tautochronic path.…”

Section: Parameter Identificationmentioning

confidence: 90%

“…Since those studies, the rig was upgraded with a new servo motor (C) and controller (B) and has undergone significant software updates for motor control, response readouts, and data processing. In addition, flywheel weights were fabricated to allow the system inertia ratio to be adjusted [4]. Also, in order to study the influence of gravity on absorber dynamics, the rig has been modified so that it can be run horizontally, i.e., rotated by 90 deg from the orientation shown in Fig.…”

Section: The Experimental Apparatusmentioning

confidence: 99%

“…From the measured results, the nonlinear path curvature for the near tautochronic absorber is found to be slightly softening (k ¼ 0:66), which results in a value of j ¼ À1:518 for the nonlinear detuning of this absorber [1,12]. 4 The absorber dissipation is modeled as an equivalent viscous damping and the attendant coefficient is measured experimentally using a log decrement method. Although some Coulomb damping has been observed and quantified for the circular path absorber, for amplitudes greater than 10 deg, the absorber decay is captured very accurately with a viscous model [4].…”

Section: Parameter Identificationmentioning

confidence: 99%

“…4 The absorber dissipation is modeled as an equivalent viscous damping and the attendant coefficient is measured experimentally using a log decrement method. Although some Coulomb damping has been observed and quantified for the circular path absorber, for amplitudes greater than 10 deg, the absorber decay is captured very accurately with a viscous model [4]. To obtain the damping coefficients, the log decrement method is applied to 13 consecutive peaks of a ringdown signal, which is obtained by switching off the oscillating torque during a resonant steady-state oscillation, resulting in a free decay of the absorber/rotor system.…”

Section: Parameter Identificationmentioning

confidence: 99%

“…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: 95%

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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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