NAL (National Aerospace Laboratory) decided to renew the balance calibration rig as a part of the revision program of the instrumentation system for the NAL-TWT (Transonic Wind Tunnel). In this paper, the method of the balance calibration using dead weight, data processing method and calibration results are presented. In the data reduction, three analytical formulae to describe the balance characteristics are applied. The linear expression is poor in accuracy compared with the non-linear formulae including second and third order terms. In the case of non-linear expressions, standard deviations for six balance components are small enough to be acceptable in wind tunnel force tests. The difference in the accuracy between second and third order formulae is small. The present calibration results are applied to the NAL-TWT experimental data using a delta-wing model to evaluate the three formulae for the balance characteristics.
内挿式6分力天秤の較正について 第1報:遷音速風洞における実荷重較正の現状
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