Rotational Angle Trajectory Tracking of a Twisted Polymeric Fiber Actuator by the Combination of a Model-Based Feed-Forward and Estimated Temperature Feedback. - Ryo Hayashi; Ken Masuya; Kentaro Takagi; Toshihira Irisawa; Rui Fujino; Takuma Yamauchi; Eitaro Tanaka; Kenji Tahara (IEEE Robotics Autom. Lett., 2019)