00458232

Component

http://onlinepubs.trb.org...trr/1985/1048/1048-008.pdf

https://scholar.google.co...dson&publication_year=1985

The objective of this paper is to provide succinct information about the use of noncontact transducer devices connected to the high-speed profilometer for the purpose of measuring the road profile. The standard Surface Dynamics (SD) profilometer has two tracking wheels to measure the height between the frame of the car and the pavement, and that distance is used to obtain the road profile. Furthermore, extremely rough sections tend to damage the potentiometer, which is connected to the tracking wheels. The trailing arm, to which the tracking wheels are connected, is held in contact with the road by a 300-lb force exerted through a torsion bar. The standard profilometer functions at 20 mph, because at this speed the torsion bar minimizes the bouncing of the wheels. Speeds greater than 20 mph produce bouncing in the wheels, thereby deforming the profile. The use of noncontact probes in the profilometer gives the capability of increasing the profilometer speed during the profiling process, and damage to the potentiometers is avoided when rough sections are profiled. Profile data obtained with two noncontact devices are compared with data obtained on the same road with the standard profilometer. A comparison between noncontact devices at two different speeds (35 and 50 mph) is also made. General regression equations for predicting root-mean-square vertical acceleration (RMSVA) and serviceability index (SI) are presented.

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

01419448

pp 50-58

1985

Transportation Research Record

0309039649

Print

Figures (13) ; Photos (3) ; References (5) ; Tables (5)

Accuracy; Equations; Forecasting; Loss and damage; Motor vehicles; Pavement performance; Prevention; Probes (Measuring devices); Profilometers; Regression analysis; Roughness; Speed; Traffic speed; Transducers

Data and Information Technology; Highways; Maintenance and Preservation; Pavements; Security and Emergencies; I23: Properties of Road Surfaces

TRIS, TRB

Sep 30 1986 12:00AM

• APPLICATION OF IN-MOTION WEIGHING USING INSTRUMENTED BRIDGES
• COMPUTERIZED PAVEMENT PERFORMANCE EVALUATION DATA BASE DEVELOPMENT FOR STRUCTURAL ADEQUACY, PRESENT SERVICEABILITY, AND DISTRESS ANALYSIS
• DEVELOPING STOCHASTIC FLEXIBLE PAVEMENT DISTRESS AND SERVICEABILITY EQUATIONS
• ESTIMATING LANEWISE TRAFFIC LOADING ON MULTILANE HIGHWAYS FROM WIM DATA
• ESTIMATION OF PAVEMENT LOADING FROM LIMITED VEHICLE VOLUME SAMPLING
• MODIFIED REFLEX-PERCUSSIVE GROOVES FOR RUNWAYS
• NETWORK SAMPLING TO ESTIMATE DISTRIBUTION OF PAVEMENT CONDITION AND COSTS
• OPERATION OF THE WASHINGTON STATE PAVEMENT MANAGEMENT SYSTEM
• OPTIMAL PAVEMENT MANAGEMENT APPROACH USING ROUGHNESS MEASUREMENTS
• TRANSPORTATION FACILITIES INFORMATION SYSTEM FOR PAVEMENT MANAGEMENT
• WEIGHING TRUCKS ON AXLE-LOAD AND WEIGH-IN-MOTION SCALES