A Cross-Flexure Sting and Measurement of Dynamic Stability Derivatives of Two Schematical Models at M Equals 4 and M Equals 7

摘要

A cross-flexure sting for measurement of dynamic stability derivatives using free oscillation technique was built and shake-out tests on two schematic models were performed at Mach number 4 and 7. The models were slender bodies of revolutions with delta-wings. The wind tunnel tests were made at reduced frequencies between 0.006-0.017 using in part transient excitation and in part random excitation. The results from the two methods agreed, in those cases where they could be compared, within 15% in most cases but in one case not better than 25%. The accuracy of the transient data obtained in the tests were estimated to be better than 12% in most cases and 19% in some. (Author)