Segmented binary control of shape memory actuator systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/30307 |
| _version_ | 1826214610981617664 |
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| author | Selden, Brian A., 1980- |
| author2 | Haruhiko H. Asada. |
| author_facet | Haruhiko H. Asada. Selden, Brian A., 1980- |
| author_sort | Selden, Brian A., 1980- |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005. |
| first_indexed | 2024-09-23T16:08:32Z |
| format | Thesis |
| id | mit-1721.1/30307 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:08:32Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/303072019-04-12T21:46:43Z Segmented binary control of shape memory actuator systems Selden, Brian A., 1980- Haruhiko H. Asada. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005. Includes bibliographical references (p. 51). A new approach to the design and control of shape memory alloy (SMA) actuators is presented. SMA wires are divided into many segments and their thermal states are controlled individually as a group of finite state machines. Instead of driving a current to the entire SMA wire and controlling the wire length based on the analogue strain-temperature characteristics, the new method controls the binary state (hot or cold) of individual segments and thereby the total displacement is proportional to the length of the heated segments, i.e. austenite phase. Although the thermo-mechanical properties of SMA are highly nonlinear and uncertain with a prominent hysteresis, Segmented Binary Control is robust and stable, providing characteristics similar to a stepping motor. However, the heating and cooling of each segment to its bi-stable states entail longer time and larger energy for transition. An efficient method for improving speed of response and power consumption is developed by exploiting the inherent hysteresis of SMA. Instead of keeping the extreme temperatures continuously, the temperatures return to intermediate "hold" temperatures closer to room temperature but sufficient to keep constant phase. Coordination of the multitude of segments having independent thermal states allows for faster response with little latency time even for thick SMA wires. Based on stress dependent thermo-mechanical characteristics, the hold temperature satisfying a given Stress Margin is obtained. The new control method is implemented using the Peltier effect thermoelectric devices for selective segment-by-segment heating and cooling. Experiments demonstrate effectiveness of the proposed method. by Brian A. Selden. S.M. 2006-03-24T18:38:43Z 2006-03-24T18:38:43Z 2005 2005 Thesis http://hdl.handle.net/1721.1/30307 61050039 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 51 p. 2515797 bytes 2519822 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Selden, Brian A., 1980- Segmented binary control of shape memory actuator systems |
| title | Segmented binary control of shape memory actuator systems |
| title_full | Segmented binary control of shape memory actuator systems |
| title_fullStr | Segmented binary control of shape memory actuator systems |
| title_full_unstemmed | Segmented binary control of shape memory actuator systems |
| title_short | Segmented binary control of shape memory actuator systems |
| title_sort | segmented binary control of shape memory actuator systems |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/30307 |
| work_keys_str_mv | AT seldenbriana1980 segmentedbinarycontrolofshapememoryactuatorsystems |