| A system to extract quantitative measurements of the axial forces and resulting in-plane displacements of Mylar and latex drumheads undergoing a tuning procedure was developed and implemented as a step towards understanding the effect of detailed drumhead tension on drum acoustics. This system encompasses a combination of specialized hardware, software, experimental methods, and post-processing techniques. A customized test apparatus was implemented to quantify axial forces while simultaneously performing Digital Image Correlation studies on a drumhead to quantify the in-plane drumhead displacement. Axial forces in the ranges of 5--100 lbf and 5--35 lbf were developed in the tensioning members of said apparatus, in various radial configurations, such to produce in-plane radial displacement distributions with maximum values of 0.01 inches and 0.60 inches during the tensioning of Mylar and latex drumheads, respectively. The viability of the Digital Image Correlation method for this application was assessed extensively, and has proven to be a valid method for quantifying the displacement of latex drumheads. This system was less effective in quantifying the displacements of Mylar drumheads; it is believed that certain optical parameters require further optimization in order to improve the validity of the displacement data that can be extracted from these drumheads. |
