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2009
Conference Paper
Title
Measurements on an adjustable pipe foot model
Abstract
The build-up of the sound in a flue organ pipe is mainly influenced by the edge tone. A small change of the flue parameters, such as positions of the lower and upper lip, the wind pressure in the pipe foot and the width of the flue, mostly results in big differences in the build-up and the spectra. In order to understand the basic physical processes a pipe foot model of a labial organ pipe with adjustable parameters has been developed. Furthermore, different types of languids and resonators (pipe bodies) can be attached to the model. A High value was set on comparisons and measurements with real metal organ pipes in order to give an indication for advisable ranges of the parameters. Flow velocity, edge tone, mouth tone and pipe sound measurements were carried out with the help of this model. From the results of the measurements theoretical models have been developed for flow velocity, velocity distribution, edge and mouth tone frequencies and for the ratios of the frequencies of edge tone modes. These models may facilitate the design and scaling of flue organ pipes.