Overload prevention in model supports for wind tunnel model testing
Journal Title: INCAS BULLETIN - Year 2015, Vol 7, Issue 3
Abstract
Preventing overloads in wind tunnel model supports is crucial to the integrity of the tested system. Results can only be interpreted as valid if the model support, conventionally called a sting remains sufficiently rigid during testing. Modeling and preliminary calculation can only give an estimate of the sting’s behavior under known forces and moments but sometimes unpredictable, aerodynamically caused model behavior can cause large transient overloads that cannot be taken into account at the sting design phase. To ensure model integrity and data validity an analog fast protection circuit was designed and tested. A post-factum analysis was carried out to optimize the overload detection and a short discussion on aeroelastic phenomena is included to show why such a detector has to be very fast. The last refinement of the concept consists in a fast detector coupled with a slightly slower one to differentiate between transient overloads that decay in time and those that are the result of aeroelastic unwanted phenomena. The decision to stop or continue the test is therefore conservatively taken preserving data and model integrity while allowing normal startup loads and transients to manifest.
Authors and Affiliations
IVANOVICI Anton, PANAIT Marius Alexandru
Keywords
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- EP ID EP117162
- DOI 10.13111/2066-8201.2015.7.3.16
- Views 98
- Downloads 0
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