Mode coupling in tone sections of a tenor steel pan

摘要

Since the SV IV review report on modal analysis studies in steel pans a relatively complete survey of normal modes of a tenor steel pan has been conducted using electronic speckle interferometry. Like holographic interferometry, this technique relies on the time average of comparisons of quasistationary images in the extreme positions of normal mode motion. Computer image processing techniques enable contrast enhancement and close to real time interference pattern observation. A number of interference patterns associated with particular note section normal modes will be shown to illustrate mode patterns, linear coupling and amplitude dependent nonlinear coupling between note sections.