The original paper which presented this neat classification scheme for interaction problems was presented before the Royal Aeronautical Society in June 1946. Fortunately the paper has been reproduced in the AIAA Selected Reprints Series on Aerodynamic Flutter. There are quite a few variations, both in the paper (tetrahedrons, for example) and elsewhere. This one in German is the most interesting. Note the various problems:
Note the many cognates, and the words which are quite different in the two languages such as krafte for force.
The two major problems of static aeroelasticity are divergence and aileron reversal - the latter also called aileron ineffectiveness. In the text by Dowell, et al, A Modern Course in Aeroelasticity (Kluwer, Norwell, MA, 02061, 1995, Chapter 2 has some excellent, though one-dimensional, divergence models. A worked out example involving two sine wave modes is included in Appendix II, pps. 669-670. Computer plots of these two modes are shown here (soon). Return to aeroelasticity home page.