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Mätning av cykeldäcks friktionsegenskaper som underlag för simuleringsstudier
Swedish National Road and Transport Research Institute, Traffic and road users, Driver and vehicle.ORCID iD: 0000-0002-8242-3407
Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.ORCID iD: 0000-0003-1162-2633
2018 (Swedish)Report (Other academic)Alternative title
Measurements of bicycle tyres friction characteristics as basis for simulation studies (English)
Abstract [sv]

I detta projekt har mätningar i VTI:s stationära däckprovningsanläggning utförts med ett cykeldäck på asfaltunderlag i syfte att ta fram slipkurvor som beskriver ett cykeldäcks friktionsegenskaper. Mätresultaten har sedan använts för att ta fram en däckparametrisering för simuleringsändamål. Följande däckparametrar har mätts: cornering stiffness, camber stiffness, brake slip stiffness och lateral relaxationslängd.

Det testade däcket genererade en maximal friktionsnivå på ungefär 1,0 på asfalten. Typiska värden på däckparametrarna var: normerad cornering stiffness 0,3; normerad camber stiffness 0,01; normerad brake slip stiffness 250. Jämfört med de få tidigare publicerade mätningar på cykeldäck så är cornering stiffness generellt ca 50 procent högre än vad som hittills rapporterats. Värdena för camber stiffness motsvarar väl de värden som en studie av racingdäck uppvisat, men är 25–50 procent lägre än värden uppmätta på mer normala däck i en annan studie. För brake slip stiffness finns inga tidigare mätningar att jämföra med. Mätning av relaxationslängden påverkades tyvärr av problem med mätutrustningen och vi kunde inte bestämma denna med önskad noggrannhet. Från mätningarna uppskattar vi relaxationslängden till 200–300 mm för det testade däcket, vilket är en faktor 2–3 ggr större än vad som rapporterades i den enda studie som tidigare mätt relaxationslängd för cykeldäck.

Abstract [en]

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.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2018. , p. 45
Series
VTI rapport, ISSN 0347-6030 ; 952
Keywords [en]
Bicycle, Tyre, Properties, Friction, Stiffness, Measurement, Test, Laboratory (not an organization)
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 916 Road: Bicycles
Identifiers
URN: urn:nbn:se:vti:diva-13033OAI: oai:DiVA.org:vti-13033DiVA, id: diva2:1207131
Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2019-05-27Bibliographically approved

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Hjort, MattiasNiska, Anna

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