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- W2468206590 abstract "Abstract The results of the subsonic doublet lattice method (DLM), i.e. generalised unsteady aerodynamic forces (GAFs) at a set of reduced frequencies, are often used as input to the solution of the flutter equation. Solutions of the flutter equation are usually required at many more reduced frequencies than GAFs are calculated for by the DLM and some form of interpolation is therefore required. In the p - k formulation of Rodden, Harder and Bellinger, the imaginary part of the GAFs appear as Q I /k , i.e. the imaginary part of the GAFs divided by the reduced frequency. In the case of real (i.e. non-oscillatory) roots of the flutter equation, the solution is determined entirely by the steady GAFs and the limiting value of Q I /k at zero frequency. This is also true of the g -method of flutter solution as the two formulations are equivalent at k = 0. Expressions are derived for calculating the limiting values of Q I /k directly from the DLM, thereby making the real roots independent of the interpolation of the GAFs. The exact way in which the low frequency DLM results are interpolated has a small effect on the interpolation quality in the case of the p - k flutter equation, whereas it has a significant qualitative effect on the results of the g -method of flutter solution of Chen." @default.
- W2468206590 created "2016-07-22" @default.
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- W2468206590 date "2005-06-01" @default.
- W2468206590 modified "2023-09-27" @default.
- W2468206590 title "Low frequency behaviour of the subsonic doublet lattice method" @default.
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- W2468206590 doi "https://doi.org/10.1017/s0001924000000749" @default.
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