Centrifugal Pendulum Vibration Absorbers: An Experimental and Theoretical Investigation

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

“…Using this method, with j ¼ n, the circular path and near tautochronic absorber tuning orders are found to bẽ n ¼ 1:312 andñ ¼ 1:449, respectively. 3 The radius of gyration for the circular path absorber is found to be r ¼ 0:0347 m, as computed using the physically measured parameters q 0 and c (see Table 2), along with the measured value for ñ, resulting in a ¼ 0:181 and b ¼ 1:714. Due to the bifilar suspension of the near tautochronic path absorber, one can simply use the measured geometry, specifically c and q 0 , given in Table 3, which yields values that precisely confirm the tuning obtained by order sweep measurements.…”

“…1. This basic setup was previously described and characterized in works that considered steady state absorber responses [2,3,5,8]. 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.…”

“…The parameters taken to be fixed for each absorber type include the absorber equivalent viscous damping coefficient l, the absorber tuning order ñ, the absorber path nonlinearity given by k and/or j, and the absorber/rotor inertia ratio . Only a brief summary of how each system parameter is estimated is given, since these methods are abstracted from previous works [2,3,5,8]. An error analysis in regards to the uncertainty in the estimated system parameters is performed following the NIST Type A method [11].…”

“…(2). 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.…”

“…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.…”