Abstract
A simplified version of transonic airfoil behavior is provided in the form of two first-order differential equations for lift and moment. This 'LTRAN2 simulator' gives a flutter boundary that is very close to the general boundary found by the describing function method. In addition, the ease of application of this simulator has allowed us to determine that an erroneous boundary can be found by time-marching. In particular, a region of nearly neutral damping occurs in the midst of an unstable region. Thus, time-marching gives the appearance of having converged when, actually, a further divergence is about to appear.
| Original language | English |
|---|---|
| Pages | 29-49 |
| Number of pages | 21 |
| State | Published - 1985 |