Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1974-07-11
1976-03-30
Gill, James J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 12, G01N 330
Patent
active
039465985
ABSTRACT:
The dynamic parameters of soil in situ are determined by: impacting freely suspended piles and measuring the force applied to and the acceleration of the piles; analyzing the measured information to determine the transfer function (impedance) of the piles; driving the piles into the soil whose dynamic parameters are to be determined; impacting one of the piles driven into the soil; measuring the force applied to and the acceleration of the driven pile; measuring the acceleration produced by the driven pile at at least one remote pile; analyzing the measured information obtained with the piles located in the soil to determine the transfer functions of the soil plus the piles; and, subtracting the transfer functions of the piles from the transfer functions of the piles plus the soil to determine the transfer function of the soil. The transfer function when plotted depicts the dynamic parameters of the soil. The analysis is performed using Fourier techniques whereby the force and acceleration measurements are converted from the time domain to the frequency domain. In addition, acceleration measurements are converted from an acceleration form to a velocity form. The Fourier transformed force measurements are divided by the Fourier transformed velocity measurements to create transform functions prior to the subtraction step being performed. In addition, errors contained in the force measurements created by any mass located between the impacting mechanism and the impacted or force pile are eliminated prior to converting the force measurements from the time domain to the frequency domain. Further, the resultant transform information is analyzed to determine if it is valid (only created by the applied force) or invalid (created by the applied force plus some external, uncontrolled force).
REFERENCES:
patent: 3222919 (1965-12-01), Shoor et al.
patent: 3498388 (1970-03-01), Jovis
patent: 3535919 (1970-10-01), Budlong et al.
Champ Stanley G.
Towne Robin M.
Ciarlante Anthony V.
Gill James J.
Robin M. Towne and Associates, Inc.
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