| Popis: |
As part of an ongoing study of Caribbean steel drums, the acoustical behavior of three alto/double tenor steel drums, each having 14–17 notes in the range of F13 to C6 (185–1047 Hz) has been studied. All except for the highest notes have three prominent harmonic partials, each associated with a mode of vibration of the local area of the drum tuned to that note. Additional harmonic partials (up to eight) are identified when a note is struck strongly, suggesting a nonlinear behavior characteristic of shallow spherical‐cap shells [N. H. Fletcher, J. Acoust. Soc. Am. 78, 2069–2073 (1985)]. By means of holographic interferometry, some modes of vibration have been able to be identified as “local” and some as “global,” encompassing several note areas on the drum. |
