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Coastdown measurement with 60-tonne truck and trailer: estimation of transmission, rolling and air resistance
Swedish National Road and Transport Research Institute, Society, environment and transport, Enviroment and traffic analysis.
Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
Swedish National Road and Transport Research Institute, Infrastructure, Measurement technology and engineering workshop.
Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
2012 (English)Report (Other academic)
Abstract [sv]

Baserat på så kallad coastdown-mätning har parametrar för färdmotstånd uppskattats för en tung lastbil med släp (60 ton) och med skåp som påbyggnad. Färdmotståndet vid en hastighet av 20 m/s, genomsnittliga vindförhållanden och 50 % lastfaktor fördelas med 5 % på transmissionsmotstånd, 41 % på rullmotstånd och 54 % på luftmotstånd. Mätningar har också utförts med lastbil utan släp. Rullmotstånd beror av vägytans ojämnhet (iri) och makrotextur (mpd). Det totala rullmotståndet kan indelas i: basmotstånd (plan yta), motstånd av iri och motstånd av mpd. På mätsträckan utgör vägyteeffekten cirka 40 % av det totala rullmotståndet. Ojämnhetseffekten bedöms utgöra den dominerande delen av vägyteeffekten till skillnad från lätta fordon.

Parametrar ingående i funktioner för färdmotstånd har uppskattats med statistisk analys. Ett problem i detta sammanhang är hur större korrelationer mellan de ingående förklaringsvariablerna skall kunna undvikas. En målsättning i försöksuppläggningen har varit att undvika sådana beroenden.

Föreliggande studie bör kunna vara av metodintresse avseende följande punkter:

  • mätsträckans lutning, bestäms med hög noggrannhet (avvägning), och övriga vägytedata ingår i analysen
  • fordonsvikt, uppföljning från utrullning till utrullning
  • utrustningen för registrering av utrullningsförloppen (Dopplerteknik)
  • separering av olika delar av färdmotståndet
Abstract [en]

By use of coastdown measurements, driving resistance parameters have been estimated for a truck with trailer (60t) and a box vehicle body. At a vehicle speed of 20 m/s, average meteorological wind conditions and a load factor of 50% the following distribution of the driving resistance components has been obtained:

  • transmission resistance (churning losses), 5%
  • rolling resistance (test route surface conditions), 41%
  • air resistance, 54%.

There are also measurements for the truck without a trailer. Rolling resistance is dependent on road surface conditions, in particular roughness (iri) and macro texture (mpd). The total rolling resistance consists of three parts: a basic, an iri and a mpd part. The road surface effect amounts to approximately 40% of the total rolling resistance. The iri effect seems to be the dominating part of the surface effects on the contrary to light vehicles.

Driving resistance parameters have been estimated by means of regression analysis. A major problem is how to avoid high correlations between explanatory variables. One objective of the experiment design has been to minimize such dependencies. This study might also be of interest for methodological reasons and in particular for including:

  • the introduction of high accuracy road gradients as well as other road surface properties
  • the estimation of vehicle mass from coastdown to coastdown
  • the equipment (based on Doppler technique) used in order to measure the coastdown driving pattern
  • the method used in order to separate parts of the driving resistance
Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2012. , 81 p.
Series
VTI notat, 15A-2012
Keyword [en]
Lorry, Trailer, Rolling resistance, Emission, Measurement, Field (test), Estimation, Calculation, Mathematical model, Method
Keyword [sv]
Lastbilar, Släpvagnar, Rullmotstånd, Emissioner, Mätning, Fältförsök, Skattning, Beräkning, Matematiska modeller, Metoder
National Category
Vehicle Engineering Infrastructure Engineering
Research subject
Road: Vehicles and vehicle technology, Road: Vehicle design and construction; Road: Highway design, Road: Surfacing
Identifiers
URN: urn:nbn:se:vti:diva-584OAI: oai:DiVA.org:vti-584DiVA: diva2:669274
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2017-03-30Bibliographically approved

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Authority records BETA

Hammarström, UlfKarlsson, RuneSörensen, HarryYahya, Mohammad Reza

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