Proposals for Controlling Flexible Rotor Vibrations by Means of an Antagonistic SMA/Composite Smart Bearing |
| Journal |
Applied Mechanics and Materials (Volumes 5 - 6) |
| Volume |
Modern Practice in Stress and Vibration Analysis VI |
| Edited by |
Patrick Sean Keogh |
| Pages |
29-36 |
| DOI |
10.4028/www.scientific.net/AMM.5-6.29 |
| Online since |
October, 2006 |
| Authors |
Daniel J. Inman,
Matthew P. Cartmell,
A.W. Lees,
Th. Leize,
L. Atepor
|
| Keywords |
Antagonistic Design, Flexible Rotor, Glass Epoxy Composite, Shape Memory Alloy (SMA), Vibration Control |
| Abstract |
Recent EPSRC funded research at Glasgow University, Swansea University, and Virginia
Polytechnic and State University, and collaborative work with the Karlsruhe University of Applied
Sciences, on the application of shape memory alloy (SMA) elements integrated within glass epoxy
composite plates and shells is currently leading to the design of a novel smart bearing based on the
principle of antagonistic action. In this system a ball bearing is fitted halfway down a glass epoxy
composite tube, entering through one end of the tube. The tube has both ends rigidly built in to the
support frame. The tube is divided into two regions, one on each side of the centrally located
bearing. SMA strips are bonded in two independent sets of four, each set running axially along half
the length of the tube and separated by 90 º around the tube. The four strips in each set are
electrically connected in series to a high current power supply that can be switched in or out, and
the current set, as required. This provides a convenient and fast way of heating each set of SMA
strips through the martensite-to-austenite transformation temperature, and provides a significant
axial contraction load on the tube in either direction. Previous FE analysis has provided predictions
for converting an axial contraction load into useful stiffening of the structure in the radial and hoop
directions. This introduces the potential for modification of the dynamic performance of the
flexible rotor. In addition to separate heating each half of the active bearing has its own
independent forced-air cooling system. Previous work by one of the authors, and others, has shown
that a single SMA/composite active bearing can be very effective in both altering the natural
frequency of the fundamental whirl mode as well as the modal amplitude. The drawback with that
design has been the disparity in the time constant between the relatively fast heating phase and the
much slower cooling phase which is reliant on forced air, or some other form of cooling. This form
of design means that the cooling phase of one half, still using forced air, is significantly assisted by
switching the other half into its heating phase, and vice versa, thereby equalising the time constants,
and giving a faster push-pull load on the centrally located bearing; a loading which is termed
‘antagonistic’ in this paper. The experimental system is discussed in terms of potential performance
and control issues. |
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