Adaptive identification and compensation for a class of hysteresis operators /
Active material actuators, sometimes referred to as "smart" actuators, are gaining widespread use for control actuation. These include Shape Memory Alloys, Magneto/Electro -Rheological Fluids and Piezo-ceramics. Each of these actuators exhibits some degree of hysteresis between their inp...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=737708041&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Active material actuators, sometimes referred to as "smart" actuators, are gaining widespread use for control actuation. These include Shape Memory Alloys, Magneto/Electro -Rheological Fluids and Piezo-ceramics. Each of these actuators exhibits some degree of hysteresis between their input and output response. There exists an extensive body of research concerning the modeling of hysteresis for the linearization, or compensation, of the hysteresis nonlinearities. However. the models have been identified off-line and mainly used in open-loop compensation. When the identified models do not exactly match the actuator nonlinearities. the compensation can create an error between the desired and actual control output. In addition, the hysteresis for several of these actuators has been shown to evolve over time, and can render a fixed hysteresis model inadequate to linearize the hysteretic nonlinearities. The main goals of this thesis are therefore to develop an adaptive hysteresis model for online identification and closed-loop, or feedback, compensation. To this end, a kysteresis model suitable for implementation in adaptive scenarios is developed. The adaptive hysteresis model is then employed in numerical simulations of adaptive identification, and the specific example of closed-loop compensation for a hysteretic actuator in model reference control. Laboratory experiments with a shape memory alloy wire actuator provide additional evidence for the success of the adaptive identification and compensation proposed in this thesis. |
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| Item Description: | Vita. "Major Subject: Aerospace Engineering" |
| Physical Description: | xi, 143 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 124-127. |