Mätning av cykeldäcks friktionsegenskaper som underlag för simuleringsstudier

Measurements of bicycle tyres friction characteristics as basis for simulation studies

In this project measurements of a bicycle tyre on an asphalt surface have been carried out in the VTI stationary tyre testing facility, in order to provide slip curves describing friction properties of the tyre. The measurement results have then been used to obtain tyre parameters for simulation purposes. The following tyre parameters have been measured: cornering stiffness, camber stiffness, brake slip stiffness and lateral relaxation length. The tested tyre generated a maximum friction level of approximately 1.0 on the asphalt. Typical values of the tyre parameters were: normalized cornering stiffness 0.3; standardized camber stiffness 0.01; standard brake slip stiffness 250. Compared to the few previously published measurements on bicycle tyres, cornering stiffness was generally about 50 percent higher than previously reported. The values for camber stiffness correspond well to the values shown by a racing tyre study but are 25-50 percent lower than the values measured on more normal tyres in another study. For brake slip stiffness there are no previous measurements to compare with. Measurement of the lateral relaxation length was unfortunately affected by problems with the measuring equipment and we could not determine the relaxation length with the desired accuracy. From the measurements, we estimate the relaxation length to 200-300 mm for the tested tire, which is a factor 2-3 to greater than reported in the only earlier study that measured relaxation length for bicycle tyres.

• Record URL:
  • http://vti.diva-portal.org/smash/get/diva2:1207131/FULLTEXT01
• 
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03476030
• Authors:
  • Hjort, Mattias
  • Niska, Anna
• Publication Date: 2018

Media Info

• Pagination: 45
• Serial:
  • VTI Rapport
  • Issue Number: 952
  • Publisher: Swedish National Road and Transport Research Institute (VTI)
  • ISSN: 0347-6030

Subject/Index Terms

• TRT Terms: Bicycles; Friction; Laboratories; Measurement; Properties of materials; Stiffness; Tests; Tires
• ITRD Terms: 1211: Bicycle; 5452: Friction; 6237: Laboratory (not an organization); 6136: Measurement; 5925: Properties; 5931: Stiffness; 6255: Test; 1381: Tyre
• Subject Areas: Materials; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 01688061
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, VTI
• Created Date: Dec 12 2018 10:45AM