The clearance process relating to aeroelastic and loads issues during the design and certification phase of a new aircraft is a combination of numerical modeling backed up by testing. There are two types of wind tunnel test that are particularly relevant to aeroelasticity and dynamic loads, namely determination of rigid aircraft aerodynamic derivatives and flutter model testing. The ground vibration test (GVT) is performed on the prototype aircraft to obtain estimates of whole aircraft normal modes (natural frequencies, damping ratios, and modal masses). The structural coupling test allows the aeroservoelastic model to be checked on the ground at zero air speed where control inertia effects are dominant. The flight simulator is controlled to match the characteristics of a rigid aircraft dynamic model. The flight flutter test (FFT) philosophy seeks to gradually extend the flight envelope by assessing flutter stability of the aircraft at progressively increasing speed and Mach number.
Testing Relevant to Aeroelasticity and Loads
2014-12-02
7 pages
Article/Chapter (Book)
Electronic Resource
English
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