Computerized measurement and tracking of acoustical resonances.

Download
Author
Conte, Donald Vincent.
Date
1982-12Advisor
Garrett, S.L.
Second Reader
Wilson, O.B.
Metadata
Show full item recordAbstract
A system is described which incorporated a Hewlett-Packard
85 "desk-toe" computer to control a frequency synthesizer
and read the output of a lock-in analyzer to measure,
display and record the resonant frequencies, amplitudes, and
quality factors of several modes of an acoustical resonator.
The system is capable of locating, measuring, and tracking
the resonant modes as parameters which affect sound speed and attenuation are varied. An algorithm for rapidly
fitting "good quality" measured data to a resonance lineshape is described which determines quality factors to
precisions cf better than 9.1 percent, amplitudes to better
than 0.01 percent ind center frequencies to better than
0.01 ppm. Sample output is provided for the lowest three
plane wave modes of a n air filled cylindrical resonator in
the temperature range of -15 to 25 degrees Celsius.
Collections
Related items
Showing items related by title, author, creator and subject.
-
Application of Constraint Dynamics for Spacecraft Maneuver
Bang, H.; Agrawal, B.N. (1994);A new approach for spacecraft maneuver based upon constraint dynamics and tracking control laws is presented in this paper. For high precision pointing requirement on spacecraft maneuver, a desired trajectory is prescribed ... -
Robustness of control laws implemented in visual based target tracking system
Lee, Han Chuan. (Monterey, California. Naval Postgraduate School, 2009-12);The previously developed guidance law implemented onboard the Small Unmanned Aerial Vehicle (SUAV) relies exclusively on the information from the image processing software and allows the performance of coordinated SUAV ... -
Inertial and magnetic tracking of limb segment orientation for inserting humans into synthetic environments
Bachmann, Eric Robert (Monterey, California. Naval Postgraduate School, 2000-12);Current motion tracking technologies fail to provide accurate wide area tracking of multiple users without interference and occlusion problems. This research proposes to overcome current limitations using nine-axis magnetic/ ...