Research Papers

Active Vibration Control Using Centrifugal Forces Created by Eccentrically Rotating Masses

[+] Author and Article Information
Richard Bäumer

Structural Analysis and Steel Structures Institute,
Hamburg University of Technology,
Denickestrasse 17,
Hamburg 21073, Germany
e-mail: richard.baeumer@tuhh.de

Uwe Starossek

Structural Analysis and Steel Structures Institute,
Hamburg University of Technology,
Denickestrasse 17,
Hamburg 21073, Germany
e-mail: starossek@tuhh.de

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received August 28, 2015; final manuscript received March 31, 2016; published online May 25, 2016. Assoc. Editor: Philippe Velex.

J. Vib. Acoust 138(4), 041018 (May 25, 2016) (14 pages) Paper No: VIB-15-1352; doi: 10.1115/1.4033358 History: Received August 28, 2015; Revised March 31, 2016

The twin rotor damper (TRD) is a newly developed active mass damper. It is presented here along with respective closed-loop control algorithms. The greatest advantage of the device is its low power demand when operated in a preferred mode of operation, the continuous rotation mode. In this mode, two eccentric masses rotate in opposite directions about two parallel axes with a mostly constant angular velocity. The resultant force is harmonic and can be used for the control of structural vibrations. To study the effect of the TRD on a single degree-of-freedom (SDOF) oscillator, various state variables are introduced and a feedback control algorithm is developed for the continuous rotation mode of operation. For reaching and leaving the continuous rotation mode, ramp-up and ramp-down trajectories are developed. These trajectories are designed such that the power and energy demand as well as the mechanical wear on the device are minimized. The feedback control algorithm is validated on a test setup. The damping effectiveness and the low power and energy demands encourage further investigation of the device under stochastic loading and comparisons with other active mass dampers.

Copyright © 2016 by ASME
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Fig. 2

TRD for a SDOF oscillator

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Fig. 3

Free body diagram of a single rotor

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Fig. 4

(a) Normalized displacement response, (b) normalized velocity response, and normalized control force (dashed line) [6]: initial conditions of Eq. (11), mcrc/(m+mc)x0=0.05, ωn=2π(rad)/s, φ0=−π/2

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Fig. 5

Rotational position of the SDOF oscillator, ψ(t)

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Fig. 6

Rotational position differences, α(t), belonging to Fig. 4

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Fig. 7

Analysis in state space

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Fig. 8

CAMD and corresponding free-body diagram

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Fig. 9

Comparison regarding power demand considering one vibration cycle, see Eqs. (23) and (33) with the optimal initial angular position according to Eq. (12)

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Fig. 10

Work done by the SDOF oscillator (a) and positive work done by the actuators (b), respectively, over total work done on the rotors during the RUP for Tru=0.5Tn

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Fig. 11

Complete damping sequence

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Fig. 12

Closed-loop angular position control

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Fig. 14

Table with TRD-unit (top view)

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Fig. 15

Uncontrolled (dashed line) and controlled displacement response of SDOF oscillator

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Fig. 16

Power demand of both actuators, corresponding to Fig. 15

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Fig. 17

Root Locus of open-loop configuration of CAMD

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Fig. 18

Positive work to be done by the actuators over rotational energy the rotors must have at the end of the RUP

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Fig. 19

States of ramp-up trajectory for n = 10

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Fig. 20

States of ramp-down trajectory

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Fig. 21

Root Locus of open-loop configuration for motor 1




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