Abstract
Here, we develop a simple model for the bending-torsion vibrations of the thin elastica; the experimental observations were described in Part I. A geometrically exact rod theory is developed: Dimensional analysis demonstrates that a curvature constraint not used in previous analyses is appropriate in our case, and this is used to develop a coupled set of non-linear integro-differential equations for the problem. Using an additional simplifying assumption on the spatial derivative of the torsional field variable, a simplified set of partial differential equations is derived. It is shown that a two-mode projection of these model partial differential equations can be related to an intuitively appealing two-degree-of-freedom mechanical system. Numerical experiments on the two-mode model show that it captures much of the behavior observed in the physical experiments on the thin elastica. In particular, the model possesses a family of bending-torsion non-linear modes with a frequency-amplitude characteristic much like that found experimentally, and the driven problem loses planar stability in a fashion analogous to that observed with the elastica.
Original language | English (US) |
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Pages (from-to) | 209-226 |
Number of pages | 18 |
Journal | Journal of Sound and Vibration |
Volume | 179 |
Issue number | 2 |
DOIs | |
State | Published - Jan 12 1995 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Acoustics and Ultrasonics
- Mechanical Engineering