Accession Number:

AD0831182

Title:

RADIATION OF SPATIALLY INCOHERENT NOISE: POINT AND LINE SOURCES.

Descriptive Note:

Interim technical rept. 1 Oct 66-30 Sep 67,

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s):

• Salmon, Vincent
• Sawyers, Kenneth N.
• Bromelow, Robert J.

Report Date:

1968-01-01

Pagination or Media Count:

43.0

Abstract:

The total field radiated to any field point from an array of non-directional statistically independent spatially incoherent noise sources is demonstrated to be calculable on the basis of the inverse square law addition of sound pressure squared. Based on this concept we have calculated the noise fields of points and of straight lines. Using as a reference the field from a point source of same total power, the actual beam-on field departs by less than 1 dB from the reference when the CPA is greater than 1.12 times the line length. In experimental work, loudspeakers simulated a line of point sources. Considering the finite area of the actual sources, reasonably good agreement with predictions was observed. Author

Descriptors:

• *UNDERWATER SOUND
• NOISE
• SOUND TRANSMISSION
• UNDERSEA WARFARE
• STATISTICAL ANALYSIS
• MATHEMATICAL PREDICTION
• SOURCES
• MEASUREMENT
• SIMULATION
• LOUDSPEAKERS
• NAVAL RESEARCH
• SIGNAL TO NOISE RATIO

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE