EFFECT OF ROAD ROUGHNESS ON VEHICLE STEERING
THE ROUGHNESS OF A PAVEMENT INFLUENCES THE STEERING BEHAVIOR OF A VEHICLE BY PRODUCING VARIATIONS IN THE NORMAL FORCES BETWEEN THE TIRES AND THE PAVEMENT THAT IN TURN EFFECT THE LATERAL FORCES NEEDED TO CONTROL THE VEHICLE. A SIMPLE MATHEMATICAL MODEL OF A PASSENGER CAR IS USED TO COMPUTE THE POSITION OF THE CAR RELATIVE TO SET OF AXES FIXED IN THE PAVEMENT AS THE VEHICLE EXECUTES DIFFERENT MANEUVERS. PAVEMENT ROUGHNESS IS INTRODUCED INDIRECTLY BY USING, AS INPUTS TO THE MODEL, THE ACTUAL NORMAL TIRE FORCES THAT WERE MEASURED EXPERIMENTALLY ON A SMOOTH AND A ROUGH PAVEMENT. FOR VEHICLE PATHS HAVING LARGE RADII OF CURVATURE AND FOR LOW VEHICLE VELOCITIES, THE LATERAL FORCES REQUIRED TO CONTROL THE VEHICLE ARE RELATIVELY SMALL. UNDER THESE CONDITIONS PAVEMENT ROUGHNESS IS RELATIVELY UNIMPORTANT. FOR VEHICLE PATHS HAVING SMALL RADII OF CURVATURE AND FOR HIGH VEHICLE VELOCITIES, THE REQUIRED LATERAL FORCES CAN BE QUITE HIGH. DEVELOPING THESE FORCES MAY NOT BE POSSIBLE IF THE PAVEMENT IS TOO ROUGH, AND THIS CAN CAUSE LOSS OF CONTROL OF THE VEHICLE. SUCH A CONDITION MAY EXIST ON A ROUGH ROAD WHEN AN OVERTAKING VEHICLE CHANGES LANES AT A HIGH VELOCITY TO PASS A SLOWER VEHICLE AND THEN IS SUDDENLY FORCED TO RETURN TO THE ORIGINAL DRIVING LANE BECAUSE OF ONCOMING TRAFFIC. SAFE VEHICLE HANDLING CAN THUS BE ADVERSELY INFLUENCED BY PAVEMENT ROUGHNESS.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309022568
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Surface Properties Vehicle Interaction. 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:
- Quinn, B E
- Hildebrand, S E
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Conference:
- 52nd Annual Meeting of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1973-1-22 to 1973-1-26
- Publication Date: 1973
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 62-75
- Monograph Title: Evaluation of pavement surface properties and vehicle interaction
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Serial:
- Highway Research Record
- Issue Number: 471
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Automobiles; Curves (Geometry); Maneuverability; Mathematical models; Pavements; Rolling contact; Roughness; Smoothness; Steering; Velocity
- Old TRIS Terms: Pavement smoothness
- Subject Areas: Highways; Pavements;
Filing Info
- Accession Number: 00207640
- Record Type: Publication
- ISBN: 0309022568
- Files: TRIS, TRB
- Created Date: Apr 27 1974 12:00AM