Volume 14, Number 4, October-December 2008
|Page(s)||657 - 677|
|Published online||18 January 2008|
Eliciting harmonics on strings
Computational and Applied Mathematics,
Rice University, Houston, TX, USA; email@example.com
2 Institut Élie Cartan, UMR 7502, Nancy Université - CNRS - INRIA, Nancy, France.
One may produce the qth harmonic of a string of length π by applying the 'correct touch' at the node during a simultaneous pluck or bow. This notion was made precise by a model of Bamberger, Rauch and Taylor. Their 'touch' is a damper of magnitude b concentrated at . The 'correct touch' is that b for which the modes, that do not vanish at , are maximally damped. We here examine the associated spectral problem. We find the spectrum to be periodic and determined by a polynomial of degree . We establish lower and upper bounds on the spectral abscissa and show that the set of associated root vectors constitutes a Riesz basis and so identify 'correct touch' with the b that minimizes the spectral abscissa.
Mathematics Subject Classification: 35P10 / 35P15 / 74K05 / 74P10
Key words: Point-wise damping / spectral abscissa / Riesz basis
© EDP Sciences, SMAI, 2008
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