Available online at hanism
and
Machine Theory
Mechanism and Machine Theory 43 (2008) 1295–1316
ate/mechmt
Vibration control and stability analysis of rotor-shaft
system with ic exciters
. Das a, . Nighil b, . Dutt c,*, H. Irretier d,1
a Department of Mechanical Engineering, . Kharagpur, Kharagpur 721 302, West Bengal, India
b Tata Consultancy Services, India
c Department of Mechanical Engineering, . Delhi, Hauz Khas, New Delhi 110 016, India
d Institute of Mechanics, University of Kassel, 7, Mo¨nchebergstrasse, D-34109 Kassel, Germany
Received 11 October 2006; received in revised form 25 October 2007; accepted 25 October 2007
Available online 21 December 2007
Abstract
Reduction of rotor vibration is very important for safe and efficient functioning of all rotating machines. This paper
proposes an active vibration control scheme for controlling transverse vibration of a rotor shaft due to unbalance and pre-
sents a theoretical study. The technique uses ic exciters mounted on the stator at a plane, in general away
from the conventional support locations, around the rotor shaft for applying suitable force of actuation over an air
gap to control transverse vibration. s used for vibration control do not levitate the rotor and facilitate
the bearing action, which is provided by conventional bearings. Suitable force of actuation is achieved by varying the con-
trol current in the exciters depending upon a proportional and derivative control law applied to the displacement of the
rotor section fed back by pick-ups with respect to the non-rotating position of the section taken as the reference. Thus
the technique provides control force over an air gap and hence is free from the difficulties of maintenance, wear and tear
and power loss. Preliminary theoretical simulation using linearized expression of ic force and the pa-
nying example show good reduction in transverse response amplitude, postponement of instability caused
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