3710. Application of the Law of Propagation of Uncertainties to a Weight and CG

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Title3710. Application of the Law of Propagation of Uncertainties to a Weight and CG
Publication TypeConference Paper
Paper Number3710
Year of Publication2019
AuthorsEmmett, Anjie
Category Number15, 21
Conference78th Annual Conference, Norfolk, VA
Conference LocationNorfolk, Virginia
PublisherSociety of Allied Weight Engineers, Inc.
Date Published05/2019

In order to quantify potential errors in a measurement system, the uncertainties of all measurement sources must be combined to generate a total system uncertainty. This quantified measurement system uncertainty may be used as a decision-making tool to determine the required accuracy of measurement devices such as load cells, scales, and laser trackers.

For NASA’s Ascent Abort 2 (AA-2) Flight Test, such an uncertainty quantification was performed to ensure that the Ground Support Equipment (GSE) designed to measure the mass and center of gravity (CG) of a Crew Module (CM) would meet the accuracy requirements set forth by the program. The uncertainties of the load cells used were combined with the laser tracker system’s positional uncertainty to determine the overall measurement system uncertainty, which met program requirements.

Key Words15. Weight Engineering - Missile Estimation, 21. Weight Engineering - Statistical Studies
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