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Experimental Control of Simultaneously Excited Structural Modes.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This experiment demonstrated the application of a lower order controller. A cantilever beams second mode was controlled without decreasing stability in the remaining modes. This was made possible by eliminating observation spillover. Computer simulations were conducted to build control designs and to predict their effectiveness. Modal suppression techniques were used on the first and third modes of a cantilever beam while control was applied to mode two a three mode model. To measure the effect of the suppression technique, an additional control design based on mode 2 alone was also evaluated. The simulations indicated that the supressed modes control design would decrease the second mode amplitude without affecting the first or third modes. Simulations also showed that the single mode model would decrease mode 2 responses but also decrease mode 1 stability. These predictions were verified experimentally on the cantilevered beam. Thesis
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