Matrix Madness and Complex Confusion... A Review of Complex Modes from Multiple Viewpoints.

Complex Modes is one of those topics that every vibration practitioner understands - just not fully. We all "know" that complex modes exhibit two shape functions that vibrate at a single frequency in phase quadrature. Experimentalists recognize complex modes from the "galloping nodes" in an animated display. Analysts understand them as result of the "non-proportional" distribution of damping. Most of us have found some aspect of the complex mode phenomenon, its analysis or measurement just a little mysterious. [ABSTRACT FROM AUTHOR]