00450702

Component

http://onlinepubs.trb.org...s/trr/1984/997/997-008.pdf

https://scholar.google.co...vies&publication_year=1984

In this paper current techniques for the measurement of dynamic axle load are reviewed and the development and testing of a prototype portable weigh-in-motion (WIM) system at the University of Nottingham, England, are described. Current techniques for dynamic axle load detection tend to be characterized by a need for permanent sensors within the road pavement that can be both costly to install and maintain. A portable WIM system that uses a temporary capacitive weighmat has been developed at the National Institute for Transport and Road Research of South Africa, and extensive tests have revealed that the system can provide accurate results for accumulated axle loadings over large samples of vehicles, but that results for individual axle loads are subject to larger errors. In an attempt to improve the reliability of weight data from the capacitive sensor, a new microprocessor-based detector unit was developed at the University of Nottingham. Some current WIM systems developed in the United States and in the United Kingdom are evaluated, and the theory of operation of the capacitive sensor is described. Laboratory tests undertaken to determine the response of the sensor to controlled loading are discussed in detail, and the prototype detector unit is described along with the results of field trials conducted on a main U.K. highway. The results of these trials indicated that improvements over previous capacitive WIM systems had been achieved and that the combination of a commercially available capacitive sensor and a new microprocessorbased detector unit provided axle load data that was within %15 percent of static weights. A commercially available capacitive WIM system, developed by the Golden River Corporation from this prototype system, is described along with a second-generation automatic weighing and classification system that was under development at the time of writing.

Publication of this paper sponsored by Committee on Monitoring, Evaluation, and Data Storage.

01419877

pp 61-70

1984

Transportation Research Record

0309038065

Print

Figures (11) ; References (10) ; Tables (1)

Axle load force; Capacitors; Dynamic loads; Measuring instruments; Microprocessors; Portable equipment; Sensors; Weigh in motion

Design; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways

TRIS, TRB

Feb 28 1986 12:00AM

• A STABLE, CONSISTENT, AND TRANSFERABLE ROUGHNESS SCALE FOR WORLDWIDE STANDARDIZATION
• DEVELOPING PAVEMENT MANAGEMENT SYSTEMS AT COUNTY AND CITY LEVELS
• DEVELOPMENT AND IMPLEMENTATION OF A NEW REHABILITATION INFORMATION AND PRIORITY PROGRAMMING SYSTEM (RIPPS)
• DEVELOPMENT OF A DATA BASE FOR NONDESTRUCTIVE DEFLECTION TESTING OF PAVEMENTS
• DYNAMIC DECISION MODEL FOR A PAVEMENT MANAGEMENT SYSTEM
• LIFE-CYCLE COSTING OF PAVED ALASKAN HIGHWAYS
• SERVICEABILITY AND DISTRESS METHODOLOGY FOR PREDICTING PAVEMENT PERFORMANCE
• SERVICEABILITY EVALUATION OF A COMPLETE INTERSTATE HIGHWAY NETWORK
• STATUS OF HIGHWAY CONDITION SCORING IN NEW YORK STATE
• TESTING THE DELFT UNIVERSITY PAVEMENT MANAGEMENT SYSTEM
• USE OF POCKET COMPUTERS FOR REHABILITATION OF RURAL ROADS IN DOMINICA