Technical Reports

Lightweight Intermodal Flatcar Evaluation Program Volume I: Modal Analysis of Railcars, an Explanation and Application Guide

  • 01
  • Dec
  • 1979
AUTHOR: M.A. Kenworthy, J.I. Smith
OFFICE: RPD
REPORT NUMBER: FRA//ORD-80/07.1
SUBJECT: Evaluation
KEYWORDS: Railcar Dynamics, Railcar Testing, Intermodal Railcars, TOFC/COFC, Modal Analysis
ABSTRACT: This report describes a methodology referred to as modal analysis which can be a very useful tool in the study of the dynamic behavior of any elastic or rigid body. The concepts of the technique are defined and illustrated with the use of a relatively simple one dimensional uniform beam. Following this, the general case is formulated and the procedure for its application is summarized. Next, practical considerations are discussed including both the analytical treatment, and the instrumentation and test design. The discussion of modal analysis concludes with the presentation of a program which used the methodology discussed in the report to make a comparative evaluation of two distinctly different rail vehicles. Conclusions are drawn and recommendations for future work are included.

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