United States Department of Transportation
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Methodology for the Calibration of the Data Acquisition with a Six-Degree-of-Freedom Acceleration Measurement Device
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1989-06-01
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[PDF-6.37 MB]
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Abstract:This report describes a methodology for calibrating and gathering data with a six-degree-of-freedom acceleration measurement device that is intended to measure head acceleration of anthropomorphic dummies and human volunteers in automotive crash testing and head impact trauma studies. Error models (system equations) were developed for systems using six accelerometers in a coplanar (3-2-1) configuration, nine accelerometers in a coplanar (3-3-3) configuration and nine accelerometers in a non-coplanar (3-2-2-2) configuration and the accuracy and stability of these systems were compared. In particular, an array of linear accelerometers in the non-coplanar (3-2-2-2) configuration was found to be most stable (computationally) and is treated in great detail. A methodology for determining the system coefficients in the laboratory is described. A correction algorithm is also described that is used to correct data taken in the field using the coefficients obtained in the laboratory. The model was verified under various input and computational conditions. Results of parametric sensitivity analyses which included parameters such as system geometry, coordinate system location, data sample rate and accelerometer cross axis sensitivities are presented. Recommendations to optimize data collection and reduction are given. Complete source listings of all of the software developed are presented. Portions of this report have appeared previously as internal documentation at the Transportation Systems Center.
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