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research-article

Real-Time Tuning of Delayed Resonator-based Absorbers for Spectral and Spatial Variations

[+] Author and Article Information
Ryan Jenkins

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, USA
ryan.jenkins@uconn.edu

Nejat Olgac

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, USA
olgac@engr.uconn.edu

1Corresponding author.

ASME doi:10.1115/1.4041592 History: Received February 27, 2018; Revised September 19, 2018

Abstract

This paper offers two interlinked contributions in the field of vibration absorption. The first involves an active tuning of an absorber for spectral and spatial variations. The second contribution is on the generalized design guidelines for such absorber operations. "Spectral" tuning handles time-varying excitation frequencies, while "spatial" tuning treats the real-time variations in the desired location of suppression. Both objectives, however, must be achieved using active control and without physically altering the system components. Spatial tuning is inspired by the concept of "non-collocated vibration absorption", for which the absorber location is different from the point of suppression. This concept is relatively under-developed, mainly because it requires the use of part of the primary structure as the extended absorber - a delicate operation. Within this investigation we employ the Delayed Resonator-based absorber, a hybrid concept with passive and active elements, to satisfy both tuning objectives. The presence of active control in the absorber necessitates an intriguing stability investigation of a time-delayed dynamics. For this subtask, we follow the well-established methods of frequency sweeping and D-subdivision. Example cases are also presented to corroborate our findings.

Copyright (c) 2018 by ASME
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