Global ETD Search

81	Design methodology of an air bearing system for multi-DOF spherical actuator motion control applications Ezenekwe, Dan Emeka 12 1900 (has links) No description available. Rotors Bearings Actuators Electromagnetic devices
82	Ultrasonic detection of debonding within a gradient enhanced piezoelectric actuator (GEPAC) Béchet, Antoine 08 1900 (has links) No description available. Piezoelectric transducers Actuators Ultrasonic testing
83	Fuzzy PWM-PID control and shape memory alloy actuator for cocontracting antagonistic muscle pairs in an artificial finger Ko, Junghyuk 03 November 2011 (has links) This thesis presents biomimetic control of an anthropomorphic artificial finger actuated by three antagonistic shape memory alloy (SMA) muscle pairs that are each configured in a dual spring-biased configuration. This actuation system forms the basis for biomimetic tendon-driven flexion/extension of the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints of the artificial finger, as well as the abduction/adduction of its MCP joint. This work focuses on the design and experimental verification of a new fuzzy pulse-width-modulated proportional-integral-derivative (i.e. fuzzy PWM-PID) controller that is capable of realizing cocontraction of the SMA muscle pairs, as well as online tuning of the PID gains to deal with system nonlinearities and parameter uncertainties. One of the main purposes of this thesis is the proposed biomimetic cocontraction control strategy, which co-activates the antagonistic muscle pairs as a synergistic functional unit. It emulates a similar strategy in neural control, called “common drive,” employed by the central nervous system (CNS). In order to maintain a desired position of a joint, the corresponding agonistic muscle pairs are cocontracted by the CNS and numerical simulations using a dynamic model of the system. The performance advantage of the cocontracting fuzzy PWM-PID controller over the original PWM-PID controller is shown by experimental results. A successful application of the new controller to fingertip trajectory tracking tasks using the MCP joint’s flexion/extension and abduction/adduction is also described. Since commercially available SMA actuators used for artificial muscle pairs have limited stroke, a new compact design was considered to increase the stroke of SMA actuators with similar power capacity. The design and fabrication process of the new SMA actuators are described followed by preliminary testing of the actuators’ performance as artificial muscle pairs with the designed fuzzy PWM-PID control algorithm. / Graduate biomimetic control fingers muscle actuators
84	A flexible three dimensional motion generator Davies, J. B. C. January 1996 (has links) No description available. 629.892 Robot actuators; Underwater manipulator
85	A hierarchical theory for layered beams with piezoelectric actuation. McLean, Clayton. January 2004 (has links) Thesis (M.A. Sc.)--University of Toronto, 2004. / Adviser: J.S. Hansen.
86	Torsional and flexural control of sandwich composite beams with piezoelectric actuators / Koike, Ayako, January 1994 (has links) Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 102-105). Also available via the Internet.
87	Coupled electro-mechanical system modeling and experimental investigation of piezoelectric actuator-driven adaptive structures / Zhou, Su-Wei, January 1994 (has links) Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references. Also available via the Internet.
88	Computer aided design of a magnetostrictive actuator / Shirer, Jeffrey J. January 1994 (has links) Report (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Abstract. Includes bibliographical references (leaves 80-81). Also available via the Internet.
89	Low temperature NiTiFe shape memory alloys actuator engineering and investigation of deformation mechanisms using in situ neutron diffraction at Los Alamos National Laboratory / Krishnan, Vinu Bala. January 2007 (has links) Thesis (Ph.D.)--University of Central Florida, 2007. / Adviser: Raj Vaidyanathan. Includes bibliographical references (p. 115-120). Also available in print. Shape memory alloys. Actuators. Neutrons
90	Material selection for the actuator design for a biomimetic rolling robot conducive to miniaturization / Dotson, Zachary S. January 2009 (has links) Thesis (M.S.)--Rochester Institute of Technology, 2009. / Typescript. Includes bibliographical references (leaves 103-105).

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