Citation

van Arnam RD, Domeck DC. Transp. Res. Rec. 1977; 621: 34-42.

Copyright

(Copyright © 1977, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

This paper deals with the configuration and instrumentation of passenger tire skid trailers. While topics written in the past have dealt mainly with testing techniques, geometry, water flow, contamination, surface descriptions, speed, rate of braking, length of skid, etc., this paper addresses itself primarily to Instrumentation Systems. Over the past twenty years, instrumentation systems have changed from vacuum tube amplifiers to solid state; from pen recorders to light beam and fiber optic oscillographs to digital tape, etc. The authors also describe a new approach to the acquisition of skid data by installing programmable calculators or mini-computers with the proper digital Interfaces to sample the analog data. Peak and SN's are then calculated directly from the sampled data. The advantages of Digital Integration over conventional analog techniques are reviewed. Stored data can be recalled, processed and later used to draw Horizontal and Vertical Force Curves, Speed and Percent Slip each Vs. time in addition to Mu-Slip.