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Reducing Conservatism in Flutterometer Predictions Using Volterra Modeling with Modal Parameter Estimation

2005; American Institute of Aeronautics and Astronautics; Volume: 42; Issue: 4 Linguagem: Inglês

10.2514/1.3116

1533-3868

Rick Lind, Joao Pedro Mortagua,

Aerospace and Aviation Technology

Accurate prediction of flutter speeds is essential to efficient and safe flight testing for envelope expansion. Such accuracy is particularly difficult to obtain when analyzing flight data from speeds well below the critical speed at which flutter occurs. The flutterometer was introduced as a tool that could predict the onset of flutter even at lowspeed conditions; however, the conservatism in those predictions reduced testing efficiency. A method to augment the flutterometer to decrease the conservatism, and consequently increase the accuracy, of the predicted flutter speeds is presented. The method incorporates a scheme for model updating that ensures consistency between the analytical dynamics and the flight data. The tool is used to compute flutter speeds for the aerostructures test wing. The speeds predicted with the model updating scheme are very close to the actual flutter speed and demonstrate the benefits for improving efficiency of envelope expansion.