Turf impact analysis system

Measuring and testing – Testing by impact or shock – Accelerated or decelerated specimen

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73 1213, G01N 330, G01M 700

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active

057366314

ABSTRACT:
A system for impact analysis of soil surfaces includes a Clegg impact hammer, an accelerometer mounted on the hammer, an analog to digital converter to digitize the deceleration signal of the accelerometer, and a computer to store the digitized curve samples and to calculate selected impact parameters from the curve samples. The apparatus includes a notebook computer and additional components all of which are portable to enable storage of a great number of curve samples and calculation of the impact parameters for a large number of test points in the field immediately after each hammer drop.

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Clegg, B., "An Impact Testing Device For In Situ Base Course Evaluation", ARRB Proceedings, vol. 8, 1976.
Clegg, B., "Field Assessment of the Impact Soil Tester", ARRB Research Report ARR No. 76, Australian Road Research Board, Vermont South, Victoria, Aug. 1977.
Clegg, B., "An Impact Soil Test for Low Cost Roads", Proceedings of 2nd Conference of Road Engineers Association of Asia & Australia, Manila, Oct. 1978.
Granelli, U. "Materials Testing in the Design and Construction of Flexible Road Bases", Le Strade, anno LXXXV, n 1206, gennaio-febbraio 1983.
Clegg, B., "Design Compatible Control of Basecourse Construction", Australian Road Research 13(2), Jun. 1983.
Rogers, J.N. III and Waddington, D.V., "Portable Apparatus for Assessing Impact Characteristics of Athletic Field Surfaces", Natural and Artificial Playing Fields: Characteristics and Safety Features, ASTM STP 1073, no date.
Bregar, M.J. and Moyer, W.W., "An Automated System for Field Testing and Soil Impact Analysis", Natural and Artificial Playing Fields: Characteristics and Safety Features, ASTM STP 1073, R.C. Schmidt, E. F. Hoerner, E.M. Milner, and C.A. Morehouse, Eds., American Society For Testing and Materials, Philadelphia 1990, pp. 115-126.
"NI-DAQ User Manual for PC Compatibles", National Instruments Corporation, Austin, TX, Sep. 1994, pp. 1-4, 1-5, 1-11, and 2-1.
"Impact Soil Tester" brochure, Lafayette Instrument Company, Lafayette, IN, (date unknown).

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