Several Belgian stainless-steel multiple-unit electric train are fitted with bogies with one-piece cast steel frames housing one 250- 265 hp nose-suspended traction motor. In view of the number eventually to be required over a period of several years, a decision was made to subject one of the first castings to comprehensive dynamic tests so that the accuracy of the designers' calculations could be checked, and so that any weak points might be brought to light before serious production began. Loads were applied at a rate of 250 cycles a minute for 133 hours or 5-1/2 days on end without interruption, to give a total of 2 times 10 (super 6) cycles. Horizontal and vertical loads were applied at the same frequency so that diagonal forces would be at a maximum at the same time. Stresses in the frame under static and dynamic loads were checked by 14 strain gauges. Under variable dynamic loading applied vertically and horizontally at the same time, maximum stress did not exceed 3-1/2 tons per sq. in. and maximum amplitude of stress variation at any one point was not above 2-1/4 tons per sq. in.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1954-11-16

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  • Accession Number: 00039967
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM