Application of Torsional Vibration Measurement to Shaft Crack Monitoring in Power Plants

Abstract

The primary goal of the this project was to demonstrate the feasibility of detecting changes in shaft natural frequencies (such as those associated with a shaft crack) on rotating machinery in electric power generation plants using non-contact, non-intrusive measurement methods. During the operation of power plant equipment, torsional natural frequencies are excited by turbulence, friction, and other random forces. This paper primarily addresses the results of field application of non-intrusive torsional vibration sensing to a hydro station and to large induced-draft (ID) fan motors. Testing reaffirmed the potential of this method for diagnostics and prognostics of shafting systems. The first few shaft natural frequencies were visible, and, for the hydro station, correlated well with finite element results (finite element results are not available for the ID fan motors). In addition, several issues related to the development of the non- intrusive transducer were revealed.

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Document Details

Document Type
Technical Report
Publication Date
Apr 05, 2001
Accession Number
ADP013495

Entities

People

  • Charles Groover
  • Ken Maynard
  • Martin Trethewey

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acquisition
  • Condition Based Maintenance
  • Data Acquisition
  • Detection
  • Engineering
  • Frequency
  • Generators
  • Machines
  • Measurement
  • Mechanical Engineering
  • Modal Analysis
  • Power
  • Reliability
  • Resonant Frequency
  • Spectra
  • Tachometers
  • Vibration

Fields of Study

  • Engineering

Readers

  • Electrical Engineering
  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.