VISCOUS DAMPER QUALIFICATION ON DIESEL LOCOMOTIVE ENGINES -- A CASE HISTORY

This paper presents some results of a study in measuring the performance characteristics of viscous vibration dampers that are used on diesel locomotive engines. The material contained within this report was obtained with the cooperation of the Atchison Topeka and Santa Fe Railway Co (ATSF) and relates to the viscous dampers that are used on large diesel engines of the type manufactured by the Electromotive Division of General Motors (EMD). The study was motivated by an abnormally high incidence of crankshaft failures on the EMD 20-645E3 engines, many of which have shown indications of torsionally induced features. Tear-down inspections of many dampers removed from the failed units proved that they were defective. The objective of this study was to develop, if possible, a method for determining the quality of dampers in an operating environment on the engine. The paper gives details of the test method developed. The total tie-up time for a locomotive, using this technique, is less than 15 minutes, including installation and removal of the signal pick-up sensor. Damper qualification on the engine has become a reality at a low cost. Even without benefit of predictive aids, such as the manufacturer's system mass elastic data, a reliable technique of experimental prediction has been developed which, in the long run, will tend to reduce the maintenance costs of these locomotive engines and allow them to survive for a greater length of time.

  • Corporate Authors:

    Trade and Technical Press, Limited

    Crown House
    Morden, Surrey SM4 5EW,   England 
  • Authors:
    • Hershkowitz, H
  • Publication Date: 1979-1

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Filing Info

  • Accession Number: 00197273
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Aug 28 1979 12:00AM