A Statistical Theory of Bidirectionality

Assessment of the Uniqueness of Wind Tunnel Strain-Gage Balance Load Predictions

“…This balance design specific characteristic can be described as a dependency of the primary sensitivities of the normal and side force bridges on the sign of the related primary gage loads (see Refs. [1], [8], and [9] for a detailed discussion of this issue). Consequently, assuming that a primary gage output of a force balance is plotted versus the related primary gage load (or vice versa), the resulting data point set may be approximated by two straight lines of different slopes that are joined together near zero load.…”