Thermoplastic variable stiffness composites with embedded, networked sensing, actuation, and control

SAGE Publications - Tập 49 Số 15 - Trang 1799-1808 - 2015
Michael McEvoy1, Nikolaus Correll1,2
1Department of Computer Science, University of Colorado at Boulder, USA
2Material Science Engineering, University of Colorado at Boulder, USA

Tóm tắt

We present a composite material consisting of a thermoplastic base material and embedded, networked sensing, actuation, and control to vary its stiffness locally based on computational logic. A polycaprolactone grid provides stiffness at room temperature. Each polycaprolactone element within the grid is equipped with a dedicated heating element, thermistor, and networked microcontroller that can drive the element to a desired temperature/stiffness. We present experimental results using a 4 × 1 grid that can assume different global conformations under the influence of gravity by simply changing the local stiffness of individual parts. We describe the composite structure and its manufacturing, the principles behind variable stiffness control using Joule heating, local sliding mode control of each polycaprolactone bar’s temperature and function, and limitations of the embedded multi-hop communication system. The function of the local temperature controller is evaluated experimentally.

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SAGE Publications

Tập 49 Số 15

1799-1808

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