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Use of Shape Memory Alloys in the Robust Control of Smart Structures

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Final rept. Feb 90-Jun 93,

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This report details an integrated interdisciplinary approach for designing and implementing robust controllers on smart structures. The application of shape memory alloy materials as actuators and sensors in the active control of smart structures has been investigated. A process was developed for the electrodeposition of In-Tl alloys in a composition range where this system exhibits the shape memory effect. Cu-Zn, Au-Ca, and In-Cd alloy films were produced using the electrolytic techniques and their shape memory properties evaluated. To demonstrate some of the capabilities of smart structures and to determine the limitations imposed by hardware realizations, we have designed and fabricated experimental test articles incorporating flexible structures with SMA actuators, strain gauge sensors, signal processing circuits and digital controllers. Structural identification techniques have been employed in determining mathematical models of test articles from experimental data. A modified robust control design methodology was developed to accommodate the limited control force provided by the SMA actuators. The robustness properties of closed loop structural systems were verified experimentally. Adaptive control methods were implemented. Neural network based identification and control algorithms were developed.

Subject Categories:

  • Inorganic Chemistry
  • Fabrication Metallurgy
  • Computer Hardware
  • Electricity and Magnetism

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