Accession Number:

ADA021483

Title:

Coherence Functions Used to Define Sources of Airborne Antenna Vibration.

Descriptive Note:

Final rept. Apr-Aug 75,

Corporate Author:

AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Thaller,Roger E.
• Pearson,Jerome

Report Date:

1975-12-01

Pagination or Media Count:

48.0

Abstract:

Conditional coherence functions are used in a practical mechanical vibration problem to determine which of several possible inputs are the major causes of vibration of an airborne antenna. Pairwise, multiple, and multiple conditional coherence spectra are derived from flight vibration data. The vibratory inputs causing several important antenna responses are identified despite correlations between inputs. These inputs offer the highest potential for reducing the antenna vibration by isolation or decoupling. The results also provide a measure of the vibration reduction which can be achieved by eliminating these inputs.

Descriptors:

• *AIRCRAFT ANTENNAS
• VIBRATION
• COHERENCE
• TIME SERIES ANALYSIS
• POWER SPECTRA
• JET TRANSPORT AIRCRAFT
• RADOMES
• FOURIER ANALYSIS
• SUPERHIGH FREQUENCY
• PARABOLIC ANTENNAS

Subject Categories:

• Transport Aircraft
• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE