The origins of longitudinal waves in piano strings
Brandon August, Nikki Etchenique, Thomas R. Moore · The Journal of the Acoustical Society of America · 2012
The importance of longitudinal waves in piano strings has been previously identified by several investigators. Recent experimental work has provided insight into the origin of these waves and their relationship to the transverse string motion. These measurements indicate that there are multiple regimes in which longitudinal waves are created through different processes.