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Vibrations of thin-walled tubes and organ flue pipes

Sound radiation from vibrating thin walled tubes and from organ flue pipes is investigated. Measurements with a laser scanning vibrometer on this object show some new interesting results, e.g. the basic azimuthal vibration mode of thin walled tubes and organ pipes is of a stable quadrupole type. Typical vibrometer scans of thin walled tubes, metallic and wooden organ pipes are presented and interpreted with respect to sound emission and design of organ pipes. The application of the results to the domains of organ building and noise reduction seems to be useful.