0
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
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 2

TRD for a SDOF oscillator

Grahic Jump Location
Fig. 3

Free body diagram of a single rotor

Grahic Jump Location
Fig. 7

Analysis in state space

Grahic Jump Location
Fig. 8

CAMD and corresponding free-body diagram

Grahic Jump Location
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

Grahic Jump Location
Fig. 5

Rotational position of the SDOF oscillator, ψ(t)

Grahic Jump Location
Fig. 6

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

Grahic Jump Location
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)

Grahic Jump Location
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

Grahic Jump Location
Fig. 12

Closed-loop angular position control

Grahic Jump Location
Fig. 14

Table with TRD-unit (top view)

Grahic Jump Location
Fig. 11

Complete damping sequence

Grahic Jump Location
Fig. 17

Root Locus of open-loop configuration of CAMD

Grahic Jump Location
Fig. 15

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

Grahic Jump Location
Fig. 16

Power demand of both actuators, corresponding to Fig. 15

Grahic Jump Location
Fig. 21

Root Locus of open-loop configuration for motor 1

Grahic Jump Location
Fig. 18

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

Grahic Jump Location
Fig. 19

States of ramp-up trajectory for n = 10

Grahic Jump Location
Fig. 20

States of ramp-down trajectory

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In