Controlling
Fan Vibration – Case Histories
D. R. Smith/J. C. Wachel, Electric
Power Research Institute, Symposium on Power Plant Fans: The
State of the Art, Indianapolis, IN, October 1981.
Fan vibration
problems have been a serious cause of plant unreliability in large
fossil-fired power plants and have resulted in operational problems,
shutdowns, and reduced generation. The basic causes of most problems
are dynamic resonances associated with the system. These have to
be identified before practical and effective recommendations can
be made for corrective action or design modifications. The most
effective solutions can best be determined from computer models
which match the measured field data. This paper discusses several
cause histories and illustrates methods and instrumentation for
analyzing existing fan problems. Experimental techniques are described
for defining problem symptoms, and these are related to root causes
by the use of data analysis and computer simulation techniques.
Computer modeling techniques can then be used to evolve reliable
fixes or used in the design stage to simulate interaction between
rotor dynamic response and complete system response to prevent potential
dynamic problems.
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