Publications Repository - Gdańsk University of Technology

This paper shows an integrated approach to measure, analyze, and model phenomena occurring in an organ pipe driven by pressurized air. The aim of this paper is two-fold, i.e., to measure the pressure signal and the intensity field around the mouth by means of an intensity probe and to visualize and observe the motion of the air jet, which represents the excitation mechanism of the system. This is realized through two techniques, i.e., measurements conducted on a Bourdon organ pipe and numerical simulations of the air flow in a pipe of the same geometry. Measurements were carried out in an anechoic chamber using the Cartesian robot. Simulations were performed on a server equipped with graphical cards, and the results were visualized employing ParaVIEW software. Moreover, an analysis was conducted by observing phenomena in both audio and video signals. A high-speed camera was employed to make the jet getting out from the windway visible. This was realized using the steam that produced the reaction of dry ice and hot water. This choice has been adopted to ensure safety conditions in the measurement environment. Finally, a comparison between the sound spectrum measured and the spectrum resulted from simulations was made.

Authors

• Paolo Bordoni,
• dr hab. inż. Józef Kotus link open in new tab ,
• dr inż. Piotr Odya link open in new tab ,
• prof. Fabio Antonacci,
• prof. dr hab. inż. Bożena Kostek link open in new tab