ROAD SURFACE IRREGULARITY AND VEHICLE RIDE, PART 2--RIDING COMFORT IN CARS BY THE PUBLIC

This Report describes a full-scale experiment which examines the subjective response to riding comfort of a sample of over 600 private car drivers, driving their own cars over road surfaces of various types of construction, with varying standards of surface regularity. In this experiment, subjective impressions of riding comfort have been related in quantitative terms to an objective measure of ride represented by the root-mean-square (rms) vertical acceleration experienced at the person/seat interface. The relationship established,in the form of a "comfort characteristic" curve, shows that, for a ride with an rms acceleration of less than .04 g, 95 percent or more of the subjects rated the standard of ride as being "acceptable or better". For rms accelerations greater than .04 g, this proportion decreases almost linearly with increasing rms acceleration. This relationship between comfort rating and rms vertical acceleration could eventually form the basis of a proposed revised specification for road surface regularity in terms of the standard of riding comfort afforded by the surface. A comparison of the responses obtained on rigid and flexible roads showed that, although similar acceleration levels were experienced, there was a greater probability, at the higher levels, that the assessment of ride on concrete surfaces would be less favourable. The levels of acceleration experienced by the Car-drivers showed no significant difference from those measured at the rear-seat position. "Comfort characteristics" curves for male and female subjects show no difference in subjective assessment of ride for the same levels of acceleration. Future work will examine the standards of riding comfort in public transport and heavy goods vehicles and also investigate the causes of the observed differences found between flexible and rigid construction. /Author/

  • Corporate Authors:

    Transport and Road Research Laboratory

    Old Wokingham Road
    Crowthorne RG11 6AU, Berkshire,   England 
  • Authors:
    • COOPER, DRC
    • Young, J C
  • Publication Date: 1978

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00183666
  • Record Type: Publication
  • Report/Paper Numbers: TRRL Supp Report 400
  • Files: TRIS
  • Created Date: Dec 12 1978 12:00AM