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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>CRITERIA FOR EVALUATING RAIL VEHICLE DYNAMICS BY COMPUTER MODELING TECHNIQUES</title>
      <link>https://trid.trb.org/View/37130</link>
      <description><![CDATA[The problem is tackled by means of a 14-degree-of-freedom computer model excited by two track geometry errors: a deterministic input based on bolted-rail track, and random geometry power spectra based on continuous welded rail. The model is not described, and the paper is devoted to the study of possible criteria and the results obtained from application of these criteria to various types of rolling stock.  The authors review the classical ride- comfort criteria of JNR, ISO, BR and devise complex criteria combining vertical and cross vibration, and characterising: the maximum permissible weight of the vehicles; the stability of the track/vehicle system; comfort in curves; the ride quality.]]></description>
      <pubDate>Wed, 21 Apr 1976 00:00:00 GMT</pubDate>
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      <title>METHODOLOGICAL CONSIDERATIONS IN THE STUDY OF HUMAN DISCOMFORT TO VIBRATION</title>
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      <description><![CDATA[Statement and discussion of vibration discomfort tests carried out with the NASA's Passenger Ride Quality Apparatus (PRQA).  A random sample of 60 subjects were subjected, over a period of time, to sinusoidal frequencies from 0 to 20 Hz with 0.05 g to 0.25 g amplitudes.  The paper explains the test equipment used, the method adopted to measure discomfort, the discomfort levels evaluated according to this method and their various correlations.  The results are summarized into seven well-defined conclusions relating to the influence of frequencies and accelerations, of the floor or seat level at which the accelerations are measured, of the previous experience of the subjects, and their personality.]]></description>
      <pubDate>Wed, 21 Apr 1976 00:00:00 GMT</pubDate>
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