
Eure K.W.Adaptive predictive feedback techniques for vibration control
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Figure C.6 Plot of control effort when filter #2 was used
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Figure C.7 Frequency magnitude response of control filter #2
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As can be seen in Fig. C.5, the frequencies around 90 Hz, 442 Hz and 604 Hz were regulated while little regulation was performed elsewhere. The black line in Fig. C.6 is the control effort and the gray line is the control effort with no frequency weighting filter applied.
The controllers presented in this appendix demonstrate that predictive control may be applied to regulate only specified sections of the frequency spectrum. In addition, the amount of regulation may be specified as a function of frequency across the bandwidth of interest given actuator authority limits are not exceeded. With the ability to specify regulation as a function of frequency, the introduction of acoustic filters into the feedback control scheme is possible. The acoustic filters may be used in the controller design to cancel plate vibrations according to the amount of energy coupled into the acoustic field. This will produce a controller which seeks to minimize acoustic intensity rather than plate vibrations, resulting in a control scheme tailored for active noise control.
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Vita
Kenneth W. Eure
Education: |
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B.S.E.E. |
Old Dominion University |
August 1990 |
M.S.E.E. |
Virginia Tech |
December 1991 |
Ph.D. E.E |
Virginia Tech |
May 1998 |
Work Experience: |
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Norfolk Naval Shipyard |
Electronics Technician |
Sept. 1983 - Jan. 1988 |
Naval Surface Warfare Center |
Electronics Engineer |
Jan. 1992 - Sept. 1994 |
NASA Langley |
Engineer |
Sept. 1994 - present |
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