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MEASUREMENT OF SKIDDING RESISTANCE, PART IV--THE EFFECT ON RECORDED SFC OF DESIGN CHANGES IN THE MEASURING EQUIPMENT

The development of a machine (SCRIM) for the routine measurement of resistance to skidding from the earlier research machines has inevitably led to design changes that have been made in the enterests of greater reliability, greater precision of measurement interests of greater reliability, greater precision of meansurement and to overcome problems associated with commercial production. This Report describes a study of the effect that these changes have had on test results. This study showed that SFC levels have increased by between 19 and 28 per cent and that three classes of factors have contributed approximately equally to the increase, namely: (a) change from test car to SCRIM, (b) change of test tyre and (c) improvements in test equipment. It was also found that it would not be practicable to reduce SFC levels by more than a proportion of this increase. Alternative courses of action are available: Revise published findings based on earlier results to bring them into line with present-day figures. Adjust present-day results to bring them into line with the published figures. The second course has the advantage that any further changes in SCRIM could be easily accommodated and published SFC levels will remain valid. /Author/

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • Hosking, T R
    • Woodford, G C
  • Publication Date: 1978

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00174435
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: TRRL Suppl. Rpt. 346
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 14 1978 12:00AM