Your Selections

Macnabb, Michael
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Vehicle Traction Experiments on Snow and Ice

B. C. Ministry of Transportation and Highways-Connie Nicolletti
University of British Columbia-Francis Navin, Michael Macnabb
Published 1996-02-01 by SAE International in United States
Traction tests were run during February, 1993 and 1994. The snow tests were conducted at a fairly constant temperature of -2°C and the ice tests at an air temperatures ranging from -4 to -35°C. The test vehicles were a standard midsize automobile and highway maintenance gravel trucks.The automobiles on packed snow at -6°C has an average braking force coefficient of 0.35, a lateral force coefficient of 0.38 and a traction force coefficient of 0.20. The corresponding values for a straight truck are: 0.23, 0.35 and 0.15. An automobile on bare ice at -6°C has an average braking force coefficient and lateral force coefficient of 0.09, and a traction force coefficient of about 0.08. The valves for the truck on bare ice in the same order are 0.06, 0.07 and about 0.04.A relationship was developed between the average braking force coefficient, ambient temperature and the amount of standard highway winter aggregate used on the road. The influence of winter aggregate on ice gave an improvement of about 15 percent at a highway maintenance light application of…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Crash III and Canadian Test Data

Accident Research Team, University of British Columbia-Francis Navin, Michael Macnabb
McGill Univ.-Neil Navin
Published 1987-02-01 by SAE International in United States
Increased awareness of road safety and a need for estimating vehicle speeds in accident reconstruction has spawned an ever increasing literature on speed estimation from vehicle damage. The theory used was quite simple and robust when first introduced in the early 1970s. The push of legislated fuel economy has produced a fleet of smaller and lighter cars which are structurally different from the vehicles of the early 1970s. The changing vehicle structure among other factors has reduced the robustness of the early analytical models introduced by Campbell (1972) and McHenry (1974). This paper goes back to a single variable, the slope of the impact speed/residual crush curve and derives a set of crush coefficients and their variance.
Annotation ability available