ROAD SURFACE IRREGULARITY AND VEHICLE RIDE, PART 1--VARIATION AND INTERPRETATION OF RIDE MEASUREMENTS

As part of a research programme being carried out in the Laboratory to quantify the relationships between road unevenness and riding comfort, the level of loading applied to the road structure, and vehicle handling and control, the relationship between subjective assessment of ride and an objective measure of ride has been investigated. The objective measure of ride is defined to be the root-mean-square of the vertical acceleration at the person-seat interface in a moving vehicle. This Report describes an experiment designed to examine the repeatability of the objective measure of ride and the variability of its subjective assessments. The results of the experiment show that: (i) The repeatability of the objective measure of ride is constant over the range of accelerations examined and it is unlikely to exceed 0.004g. This level of repeatability is considered to provide adequate discrimination between road surfaces for the purpose of studies of riding comfort. (ii) The relationship between subjective assessments of ride and the objective measure of ride can be quantified in the form of a "comfort characteristic curve". This curve gives the probability that a given quality of ride will be rated as "acceptable" or better by vehicle occupants. (iii) The level of the objective measure of ride increases linearly with speed; the level depends on vehicle type and on the uneveness of the road profile. /Author/

  • Corporate Authors:

    Transport and Road Research Laboratory

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

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00183665
  • Record Type: Publication
  • Report/Paper Numbers: TRRL Supp Report 341
  • Files: TRIS, ATRI
  • Created Date: Dec 12 1978 12:00AM