On the calibration of six-component internal balances. Part 3: Initial balance calibration results with the automatic balance calibration system using combination loading
The shakedown operation of the new automatic balance calibration system has been conducted since 1993 with two typical internal balances for the NAL-TWT (Transonic Wind Tunnel). The calibration system including hardware and software has already been described in detail. In this paper, the balance calibration results during shakedown operation are analyzed for evaluation of the new system. Emphasis is placed on the following items: comparison of the calibration results between the component loading method and the combination loading method in balance calibration, repeatability of the coefficient matrices of two balances in the operation, comparison of the calibration results obtained with several balance calibration systems, effects of combination loading profiles on the coefficient matrices of balances, and findings of the problems concerning the system operation. It is concluded that repeatability of the coefficient matrices of the balances is excellent and that they are applicable to data treatment of transonic wind tunnel tests. However, further efforts are necessary to improve the M(sub x) component of the new calibration system.
内挿式六分力天秤の較正について 第3報:複合荷重式自動天秤較正装置による初期較正試験結果
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