Measuring and testing – Miscellaneous
Patent
1984-05-17
1985-08-06
Levy, Stewart J.
Measuring and testing
Miscellaneous
73148, 73147, G01M 900, G01N 3300
Patent
active
045328013
ABSTRACT:
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, i.e., the baseline configuration with a minor structural modification superimposed thereon, and vice versa, a nulling force mechanism to apply a nulling force to the variable model to null out the total fluid-dynamic drag resistance acting thereon, i.e., return the variable model to an undeflected position, and a system for measuring the deflections of the variable model caused by the small magnitude fluid-dynamic drag resistance differentials acting thereon. The variable model is mounted in the environmental test facility, and a predetermined fluid flow is initialized and stabilized. 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 acting thereon are determined by measuring the deflections of the variable model by the measuring system. The efficacy of the minor structural modification to the variable model may then be assessed by comparing the small magnitude fluid-dynamic drag resistance differentials of the different configurations.
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Clark Albert P.
Coder David W.
Ratcliffe Raymond J.
Wisler, Jr. Benjamin B.
Beers Robert F.
Levy Stewart J.
Marsh Luther A.
Noland Tom
The United States of America as represented by the Secretary of
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