CORRECTING WIND TUNNEL FORCE MEASUREMENTS FOR WIND LOADING DEFLECTIONS OF THE MODEL

Authors
  1. Watt, G.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
In the fall of 1988, DREA carried out tests on a 6 metre long submarine model in the National Aeronautical Establishment 9 by 9 metre wind tunnel in Ottawa. Accuracy requirements were such that force data needed to be corrected for body axes transformation and gravitational tare errors resulting from wind loading deflections of the model. These errors occur both with balances mounted external to the tunnel and internal to the model, and are significant if model mass and/or wind loading deflections are large. Analyses are presented which correct for the loading deflections of models with arbitrary wind-off yaw, pitch, and roll orientations. These corrections depend on mass, stiffness, and various geometric parameters of the model/strut system. In general, the correction procedures for internal balances are simpler, less time consuming, and more accurate than those for external balances.
Report Number
DREA-TM-89-225 — Technical Memorandum
Date of publication
15 Oct 1989
Number of Pages
29
DSTKIM No
90-00129
CANDIS No
62408
Format(s):
Hardcopy;Originator's fiche received by DSIS

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