TRACTION AND STABILITY OF FRONT, REAR, AND FOUR-WHEEL DRIVE TRUCKS ON LAKE ICE, SERIES OF 1949
THE BEHAVIOR OF VEHICLES ON AN ICE TANGENT OR CURVE WITH BRAKES OR EXCESS TORQUE APPLIED TO THE FRONT, REAR, AND EACH OF THE FOUR WHEELS IS DESCRIBED. EACH CONDITION IS ANALYZED ON THE BASIS OF THE FORCES ACTING ON THE VEHICLE. (1) A STABLE VEHICLE MAY BE DEFINED AS ONE WHICH HAS ZERO MOMENTS ACTING ON IT IN A HORIZONTAL PLANE WHEN THE DRIVING WHEELS ARE LOCKED OR SPINNING. THE FRONT WHEEL DRIVE VEHICLE IS UNSTABLE IN A CLOCKWISE DIRECTION WHEN THE VEHICLE IS MAKING A LEFT HAND CURVE CAUSING IT TO HOLD ITS COURSE ON A STRAIGHTAWAY, BUT WHEN ON A CURVED HIGHWAY TO GO OFF THE ROAD. (2) THE REAR DRIVE VEHICLE IS UNSTABLE IN A COUNTERCLOCKWISE DIRECTION WHEN MAKING A LEFT HAND CURVE, CAUSING IT TO GO INTO A FLAT SPIN EITHER ON A CURVE OR ON A STRAIGHTAWAY IF SUBJECTED TO EVEN SLIGHT LATERAL FORCES. THE FOUR WHEEL DRIVE VEHICLE FOR BOTH BRAKING AND EXCESS TORQUE APPLICATION HAS A RELATIVELY SMALL NET MOMENT IN THE CLOCKWISE DIRECTION WHEN MAKING A LEFT HAND CURVE WHICH CAUSES IT TO HOLD ITS COURSE ON THE STRAIGHTAWAY; WHEN ON A CURVE, THE MOMENT IS NOT SO LARGE AS TO THROW THE VEHICLE OFF THE CURVE ON A TANGENT. DATA ARE PRESENTED ON THE DRAWBAR PULL OF FRONT, REAR AND FOUR WHEEL DRIVE VEHICLES ON ICE WITH VARIOUS LOADS UNDER STATIC, SPINNING, AND DYNAMIC CONDITIONS. FROM THESE DATA, THE COEFFICIENTS OF TRACTION ARE COMPUTED WHICH ARE APPLIED TO THE VEHICLE DESIGN FOR MAXIMUM DRAWBAR PULL. /AUTHOR/
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Supplemental Notes:
- Vol 29, pp 319-336, 15 FIG, 7 TAB, 3 PHOT. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Easton, A H
- Publication Date: 1950
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Twenty-Ninth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 13-16, 1949.
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Serial:
- Highway Research Board Proceedings
- Volume: 29
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Brakes; Four wheel drive; Ice; Stability (Mechanics); Torque; Traction; Trucks
- Subject Areas: Highways; Motor Carriers; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00223505
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 25 1971 12:00AM