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Title:

SERVO-SEISMIC METHOD OF MEASURING ROAD PROFILE

Accession Number:

00206761

Record Type:

Component

Abstract:

THE METHOD USED TO MEASURE ROAD PROFILE AND TECHNIQUES USED TO ESTABLISH THE ACCURACY OF THESE MEASUREMENTS ARE DESCRIBED. ATTEMPTS TO CORRELATE THE FREQUENCY CHARACTERISTICS OF THE ROAD PROFILE SIGNAL WITH ROAD ROUGHNESS IS DESCRIBED AS EXPERIENCED THROUGH A CAR SUSPENSION. A STATIONARY INERTIAL REFERENCE PLATFORM WITH AN ACCELEROMETER WAS USED TO MEASURE THE VERTICAL DISPLACEMENT OF THE ROAD FOLLOWING WHEEL WITH RESPECT TO THE PLATFORM. AN ACCELERATION SIGNAL FROM THE ACCELEROMETER INDICATES THAT THE PLATFORM HAS MOVED AND THE DOUBLE INTEGRATION OF THE ACCELEROMETER SIGNAL SHOWS HOW MUCH. THE PLATFORM POSITIONING WAS OBTAINED BY USE OF AN ELECTROHYDRAULIC VALVE AND HYDRAULIC ACTUATOR WHICH PRODUCE A MOVEMENT OF THE ACTUATOR RAM THAT IS PROPORTIONAL TO THE ELECTRIC VOLTAGE SUPPLIED TO THE VALVE. THE ACTUATOR RAM WITH THE ACCELEROMETER MOUNTED ON THE END IS THE INERTIAL REFERENCE PLATFORM. THE ANALOG COMPUTER INTEGRATES THE ACCELEROMETER SIGNAL AND FEEDS A SIGNAL PROPORTIONAL TO THE PLATFORM DISPLACEMENT TO THE ELECTROHYDRAULIC VALVE. THE VALVE THEN CAUSES AN OIL FLOW TO THE APPROPRIATE CHAMBER IN THE ACTUATOR. THIS SERVO-SEISMIC SYSTEM OFFERS A QUICK, REASONABLY ACCURATE METHOD OF OBTAINING ROAD PROFILE DATA IN A FORM CONVENIENT TO RAPID COMPUTER ANALYSIS.

Supplemental Notes:

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.

Monograph Accession #:

01410709

Authors:

Spangler, Elson B
Kelly, William J

Pagination:

pp 33-51

Publication Date:

1962

Serial:

Highway Research Board Bulletin

Issue Number: 328
Publisher: Highway Research Board

Conference:

41st Annual Meeting of the Highway Research Board

Location: Washington DC, United States
Date: 1962-1-8 to 1962-1-12
Sponsors: National Research Council

Media Type:

Digital/other

Features:

Figures (32)

Uncontrolled Terms:

Profiles

Subject Areas:

Highways; Pavements; Vehicles and Equipment

Files:

TRIS, TRB, ATRI

Created Date:

Aug 5 1994 12:00AM

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