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Full-Text Articles in Physics
The Dynamics And Tuning Of Orchestral Crotales, Bradley M. Deutsch, Cherie L. Ramirez, Thomas R. Moore
The Dynamics And Tuning Of Orchestral Crotales, Bradley M. Deutsch, Cherie L. Ramirez, Thomas R. Moore
Student-Faculty Collaborative Research Publications
Crotales are center-weighted, tuned cymbals that are found in the percussion section of most orchestras. They are arranged like a keyboard in octave sets and are commercially available in two octaves, from C6 to C8. Little information about the physics of crotales has been reported in the literature, despite their having the interesting property of producing a particularly pleasing sound. In this study, the acoustic and vibrational properties of crotales from C6 to C8 are theoretically and experimentally investigated. Interferograms of typical vibrational modes are presented, and the frequencies of the acoustically important modes of crotales are identified and reported. …
A Simple Design For An Electronic Speckle Pattern Interferometer, Thomas R. Moore
A Simple Design For An Electronic Speckle Pattern Interferometer, Thomas R. Moore
Faculty Publications
An electronic speckle pattern interferometer suitable for use in an undergraduate laboratory is described. This interferometer can be built for a small fraction of the cost of a commercial version and is simple and inexpensive to build and understand. The interferometer is useful for visualizing the normal modes of vibrating objects as well as changes in index of refraction.
Non-Degenerate Normal-Mode Doublets In Vibrating Flat Circular Plates, Bradley M. Deutsch, Alexandra R. Robinson, Richard J. Felce, Thomas R. Moore
Non-Degenerate Normal-Mode Doublets In Vibrating Flat Circular Plates, Bradley M. Deutsch, Alexandra R. Robinson, Richard J. Felce, Thomas R. Moore
Student-Faculty Collaborative Research Publications
The vibrations of flat circular plates have been studied for hundreds of years, and they are well understood by the scientific community. Unfortunately, when vibrating circular plates are discussed in textbooks, the relationship between pairs of spatially orthogonal vibrational patterns that occur at each of the normal-mode frequencies is often ignored. Usually these orthogonal solutions are presented to the student as being degenerate in frequency; however, in practice the degeneracy of the doublet is often broken and the two spatially orthogonal solutions are separated in frequency. We show theoretically and experimentally that the degeneracy can be broken by a small …