A Study of the Effect of Radical Load Distributions on Calibrated Strain Gage Load Equations

Jenkins, Jerald M. and Kuhl, Albert E. (1977) A Study of the Effect of Radical Load Distributions on Calibrated Strain Gage Load Equations. Technical Report NASA TM-56047, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

For several decades, calibrated strain gages have been used to measure loads on airplanes. The accuracy of the equations used to relate the strain gage measurements to the applied loads has been based primarily on the results of the load calibration. This paper presents an approach for studying the effect of widely varying load distributions on strain gage load equations. The computational procedure presented provides a link between the load calibration and the load to be measured in flight. A matrix approach to equation selection is presented. This matrix approach, which is based on equation standard error, load distribution, and influence coefficient plots of the strain gage equations, is applied to a complex, delta-wing structure.

EPrint Type:	NASA Technical Memorandum
Keywords:	Strain gages, Loads, Load equations
Subjects:	Aircraft/Project: Nonaircraft-specific (31 - 39) Engineering: (39) Structural Mechanics
ID Code:	697
Deposited On:	14 Febuary 2006
Additional Information:	36 pages.