| Autor: |
Luker, L. Dwight, Van Buren, Arnie L., Rogers, Peter H. |
| Zdroj: |
Journal of the Acoustical Society of America; 1994, Vol. 96 Issue 1, p186-197, 12p |
| Abstrakt: |
This paper describes an investigation of a prototype cylindrical wave-number calibrator (CWC). The CWC is a water-filled device designed to generate nonacoustic-wave-number pressure fields propagating axially in the water within the calibrator. It can therefore be used to simulate the effects of flow noise on a device placed in the water. Insight into the design of the CWC is obtained from an analysis of an infinitely long, liquid-filled, cylindrical chamber with an axially-symmetric, normal-velocity distribution on the wall of the chamber. Additional insight is provided by a study of the propagation speed in the fluid inside an infinite-length elastic tube surrounded by another fluid. A finite-length CWC is then investigated with several computer models of the CWC using the CHIEF acoustic-radiation program and the ATILA finite element program. These models are integrated into a computer program that uses the electroacoustic transfer matrix for the system to compute electrical drives designed to produce the desired nonacoustic-wave-number fields within the CWC. A prototype CWC with 40 independently driven bands was constructed from a piezoelectric-PVDF tube. The pressure fields within the CWC resulting from drives computed using measured and modeled transfer matrices were measured and compared with predicted fields. The results show that relatively uniform nonacoustic-wave-number pressure fields can be created within the CWC. The results are considerably better using measured transfer matrices rather than matrices determined using the models. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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