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Hysteresis analysis and positioning control for a magnetic shape memory actuator.
Jhih-Hong Lin1, Mao-Hsiung Chiang2
1Department of Engineering Science and Ocean Engineering, National Taiwan University, No.1, Sec.4, Roosevelt Rd., Taipei 106, Taiwan. d98525020@ntu.edu.tw.
Sensors (Basel, Switzerland)
|April 9, 2015
Summary
Magnetic shape memory alloy (MSM) actuators offer large strain and fast response for micro engineering. A modified fuzzy sliding mode control (MFSMC) effectively overcomes MSM hysteresis for precise positioning.
Area of Science:
- Materials Science
- Control Engineering
- Smart Materials
Background:
- Magnetic shape memory alloys (MSM alloys) are advanced smart materials with significant potential in engineering applications.
- MSMs exhibit large strain capabilities and rapid response times, making them suitable for micro-engineering.
- A key challenge in utilizing MSM actuators is their inherent nonlinear behavior due to hysteresis, complicating precise positioning.
Purpose of the Study:
- To analyze the hysteresis phenomenon in Magnetic Shape Memory (MSM) alloy actuators.
- To experimentally implement and evaluate closed-loop positioning control strategies for MSM actuators.
- To compare the effectiveness of a proposed Modified Fuzzy Sliding Mode Control (MFSMC) against traditional PID control.
Main Methods:
- Experimental analysis of MSM actuator hysteresis.
- Development and implementation of a Modified Fuzzy Sliding Mode Control (MFSMC) algorithm.
- Comparative experimental testing of MFSMC and PID controllers under varying frequencies, amplitudes, and loads.
Main Results:
- The study successfully analyzed the hysteresis characteristics of MSM actuators.
- Experimental results demonstrated the feasibility of closed-loop positioning control for MSM actuators.
- The MFSMC controller achieved satisfactory precise positioning control, outperforming PID under various conditions.
Conclusions:
- The hysteresis in MSM actuators presents a significant challenge for precise positioning.
- Modified Fuzzy Sliding Mode Control (MFSMC) is an effective strategy for mitigating hysteresis and achieving precise positioning in MSM actuators.
- The proposed MFSMC offers a robust solution for controlling MSM actuators in demanding micro-engineering applications.
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