| Autor: |
Williams, Earl G., Dardy, Henry D., Fink, Richard G. |
| Zdroj: |
Journal of the Acoustical Society of America; 1985, Vol. 77 Issue S1, pS23-S24, 2p |
| Abstrakt: |
We demonstrate a measurement technique to determine the structure-borne intensity (power flow) in a point-driven, fluid-loaded, homogeneous thin plate. This intensity is uniquely determined from a knowledge of the normal velocity of the surface of a sinusoidally driven plate. A noncontact method is presented which uses a scanning hydrophone to measure the pressure in a plane very close to the source. It is shown how this pressure measurement is sufficient to compute the two-dimensional structural intensity vector inside the plate. Furthermore, these vectors are used to compute the power injected into the plate from a point driver. Independent measurement of injected mechanical power is shown to be in close agreement. A comparison of the structure-borne intensity with the acoustic intensity radiated into the medium indicates that structual intensity is much more accurate in locating the real source than the acoustic intensity, the latter often failing completely. The examples given in this paper are for a source underwater, but the technique applies without modification to plate sources in air. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
