Method and Apparatus for Determining Small Magnitude Fluid-Dynamic Drag Resistance Differentials Between Different Structural Configurations of a Model.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent discloses a method and apparatus for determining small magnitude fluid-dynamic drag resistance differentials between different structural configurations of a variable model mounted in an environmental test facility. The variable model has disposed therein a configuration conversion mechanism to convert the variable model from a baseline configuration to a modified baseline configuration with a nulling force mechanism to apply a nulling force to the variable model to null out the total fluid-dynamic drag resistance acting thereon. An initial deflection of the variable model due to the total fluid-dynamic drag resistance acting thereon is nulled out by applying the nulling force to the variable model through the nulling force mechanism. The variable model is then alternately converted to the baseline configuration and the modified baseline configuration by remote actuation of the configuration conversion mechanism, and the small magnitude fluid-dynamic drag resistance differentials of the different configurations.
- Fluid Mechanics