Nancy L. Johnson

Papers

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About

Nancy L. Johnson is a researcher specializing in the control and actuation of shape memory alloys (SMAs)—materials that can "remember" and return to a predefined shape when heated. Her key contributions center on developing adaptive control strategies for SMA actuators, particularly through the innovative use of resistance feedback to precisely monitor and regulate the phase transformation process. In her highly cited 2011 work, "Adaptive SMA actuator priming using resistance feedback" (13 citations), Johnson introduced a method to improve actuator reliability and performance by using electrical resistance as a real-time sensor, eliminating the need for external position sensors. This approach has significant implications for applications in robotics, aerospace, and biomedical devices, where compact, lightweight, and silent actuation is critical. Johnson’s work bridges materials science and control engineering, offering practical solutions for the hysteresis and nonlinearity challenges inherent in SMAs. Her research continues to influence the design of more robust and efficient smart material actuators, making her a notable contributor to the field of adaptive systems and intelligent materials.