D. Guzas

Many publications of different authors are devoted to the research of cylindrical shell vibration and sound insulation. Most of the publications are of theoretical character. The obtained expressions are complicated and do not allow the character of dependence of the quantities under study upon the change of various parameters to be understood. This greatly reduces their value. To determine the character of oscillations excitation, their propagation in the tube and impedance a special equipment was assembled. The report presents the methods of measurement performance as well as the processing and analysis of the results obtained. Tube wall oscillations of the experimental equipment have been excited concentrically and parameters of propagated oscillations of the tube have been measured. It allowed the entrance impedance and admittance of the tube at narrow frequency bands to be defined. In order to determine impedance and admittance by calculation method the computer program has been worked out. The results obtained experimentally and theoretically are represented in diagrams. It is obvious from the diagrams that computed and experimental meanings of the entrance impedance model are in satisfactory agreement. Impedance meanings measured during the experiment are located slightly higher (are greater) than calculated ones.

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 7 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.321-327; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995