In gas and steam turbine applications a common approach to prevent the blades from high cycle fatigue failures due to high vibration amplitudes is the usage of friction damping elements. Besides the intended amplitude reduction this procedure also features some possibly unwanted side effects like a shift in resonance frequencies due to stiffening effects caused by the contact. Thus, as an alternative an eddy current based noncontacting damping concept for the application in turbomachinery is investigated. In this paper two different types of eddy current dampers are considered. Theoretical models for both are established by applying electromagnetic-mechanical theory. The theoretical models are compared with forced response measurements that are performed at a stationary test rig.

Issue Section:
Gas Turbines: Structures and Dynamics
Keywords:
blades, damping, fatigue, steam turbines, vibrations
Topics:
Damping, Eddies (Fluid dynamics), Eddy currents (Electricity), Blades, Vibration, Steam turbines
1.
Sanliturk
,
K. Y.
,
Ewins
,
D. J.
, and
Stanbridge
,
A. B.
, 2001, “
Underplatform Dampers for Turbine Blades: Theoretical Modelling, Analysis and Comparison With Experimental Data
,”
J. Eng. Gas Turbines Power
0742-4795,
123
, pp.
919
–
929
.
Crossref
Search ADS
 
2.
Firrone
,
C. M.
,
Allara
,
M.
, and
Gola
,
M. M.
, 2008, “
A Contact Model for Nonlinear Forced Response Prediction of Turbine Blades: Calculation Techniques and Experimental Comparison
,” ASME Paper No. GT2008-51231.
3.
Panning
,
L.
,
Sextro
,
W.
, and
Popp
,
K.
, 2000, “
Optimization of Interblade Friction Damper Design
,” ASME Paper No. GT-2000-0541.
4.
Panning
,
L.
,
Popp
,
K.
,
Sextro
,
W.
,
Götting
,
F.
,
Kayser
,
A.
, and
Wolter
,
I.
, 2004, “
Asymmetrical Underplatform Dampers in Gas Turbine Bladings: Theory and Application
,” ASME Paper No. GT-2004-53316.
5.
Walter
,
H. E.
, 1892, “
Electro-Magnetic Brake
,” U.S. Patent No. 467,243.
6.
Schieber
,
D.
, 1975, “
Optimal Dimensions of Rectangular Electromagnet for Braking Purposes
,”
IEEE Trans. Magn.
0018-9464,
11
(
3
), pp.
948
–
952
.
Crossref
Search ADS
 
7.
Lee
,
K.
, and
Park
,
K.
, 2002, “
Modeling Eddy Currents With Boundary Conditions by Using Coulomb’s Law and Method of Images
,”
IEEE Trans. Magn.
0018-9464,
38
(
2
), pp.
1333
–
1340
.
8.
Meier-Credner
,
W. -D.
, 2000, “
Die lineare Wirbelstrombremse-Entwicklung und Einsatz im ICE 3
,”
Eisenbahntechnische Rundschau
0013-2845,
49
(
6
), pp.
412
–
418
.
9.
Sodano
,
H. A.
, 2005,
Development of Novel Eddy Current Dampers for the Suppression of Structural Vibrations
,” Ph.D. thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.
10.
Kligerman
,
Y.
, and
Gottlieb
,
O.
, 1998, “
Dynamics of a Rotating System With a Nonlinear Eddy-Current Damper
,”
Trans. ASME, J. Vib. Acoust.
1048-9002,
120
, pp.
848
–
853
.
Crossref
Search ADS
 
11.
Graves
,
K.
,
Toncich
,
D.
, and
Iovenitti
,
P.
, 2000, “
Theoretical Comparison of Motional and Transformer EMF Device Damping Efficiency
,”
J. Sound Vib.
0022-460X,
233
, pp.
441
–
453
.
Crossref
Search ADS
 
12.
Kwak
,
M.
,
Lee
,
M.
, and
Heo
,
S.
, 2003, “
Vibration Suppression Using Eddy Current Damper
,”
Korean Society for Noise and Vibration Engineering
,
13
(
10
), pp.
760
–
766
.
13.
Bae
,
J.
,
Kwak
,
K.
, and
Inman
,
D.
, 2005, “
Vibration Suppression of a Cantilever Beam Using Eddy Current Damper
,”
J. Sound Vib.
0022-460X,
284
(
3-5
), pp.
805
–
824
.
Crossref
Search ADS
 
14.
Sodano
,
H.
,
Bae
,
J.
,
Inman
,
D.
, and
Belvin
,
W.
, 2005, “
Concept and Model of Eddy Current Damper for Vibration Suppression of a Beam
,”
J. Sound Vib.
0022-460X,
288
, pp.
1177
–
1196
.
Crossref
Search ADS
 
15.
Sodano
,
H.
,
Bae
,
J.
,
Inman
,
D.
, and
Belvin
,
W.
, 2006, “
Improved Concept and Model of Eddy Current Damper
,”
ASME J. Vib. Acoust.
1048-9002,
128
, pp.
294
–
302
.
Crossref
Search ADS
 
16.
Ebrahimi
,
B.
,
Khamesee
,
M. B.
, and
Golnaraghi
,
M. F.
, 2008, “
Design and Modeling of a Magnetic Shock Absorber Based on Eddy Current Damping Effect
,”
J. Sound Vib.
0022-460X,
315
, pp.
875
–
889
.
Crossref
Search ADS
 
17.
Sodano
,
H.
,
Inman
,
D.
, and
Belvin
,
W.
, 2006, “
Development of a New Passive-Active Magnetic Damper for Vibration Suppression
,”
ASME J. Vib. Acoust.
1048-9002,
128
, pp.
318
–
327
.
Crossref
Search ADS
 
18.
Sodano
,
H.
, and
Inman
,
D.
, 2007, “
Non-Contact Vibration Control System Employing an Active Eddy Current Damper
,”
J. Sound Vib.
0022-460X,
305
, pp.
596
–
613
.
Crossref
Search ADS
 
19.
Sodano
,
H. A.
 and
Inman
,
D. J.
, 2008, “
Modeling of a New Active Eddy Current Vibration Control System
,”
ASME J. Dyn. Syst., Meas., Control
0022-0434,
130
, p.
021009
.
Crossref
Search ADS
 
20.
Tonoli
,
A.
, 2008, “
Transformer Eddy Current Dampers for the Vibration Control
,”
ASME J. Dyn. Syst., Meas., Control
0022-0434,
130
, pp.
031010
.
Crossref
Search ADS
 
21.
Ernst
,
P.
,
Hunziker
,
R.
, and
Rhyner
,
J.
, 1999, “
Magnetische Vorrichtung zur Dämpfung von Schaufelschwingungen bei Turbomaschinen
,” Patent No. DE 199 37 146 A 1.
22.
Siewert
,
C.
,
Panning
,
L.
,
Hohl
,
A.
,
Bürge
,
A.
, and
Gerber
,
C.
, 2007, “
Damping of Structural Vibrations Using an Electromotive Eddy Current Damper
,”
Proc. Appl. Math. Mech.
1617-7061,
7
, pp.
4040039
–
4040040
.
Crossref
Search ADS
 
23.
Lehner
,
G.
, 2005,
Elektromagnetische Feldtheorie: Für Ingenieure und Physiker
, 5th ed.,
Springer
,
New York
.
24.
Bronshtein
,
I.
,
Semendyayev
,
K.
,
Musiol
,
G.
, and
Muehlig
,
H.
, 2007,
Handbook of Mathematics
,
Springer-Verlag
,
New York
, Vol.
5
.
25.
Kupfmüller
,
K.
,
Mathis
,
W.
, and
Reibiger
,
A.
, 2005,
Theoretische Elektrotechnik: Eine Einführung
, 17th ed.,
Springer-Verlag
,
Berlin
.
26.
Cheng
,
D.
, 1989,
Field and Wave Elektromagnetics
, 2nd ed.,
Addison-Wesley
,
Reading, MA
.
Copyright © 2010
 by ALSTOM
You do not currently have access to this content.