Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1229 for “"Actuators"”.
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Electroosmotic Soft Actuators
… with PC was achieved within sealed miniature actuators, which could be continuously operated for at least one hour. Benchtop fabrication techniques were developed to build encapsulated fluidic actuators composed entirely of soft, flexible materials. Stretchable electrochemically stable …
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Series elastic actuators
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Conducting polymer actuators
Conducting polymers are unusual organic materials featuring high electronic conductivity. Recently it has been observed that some of these polymers change in dimension when their oxidation state is altered. Dimensional changes induced by electrochemical activation in the conducting polymer …
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Instability of Dielectric Elastomer Actuators
… of electrically-driven, highly deformable actuators and devices, which find application in several fields of technology and engineering, including aerospace, biomedical and mechanical engineering. Subject to a voltage, a membrane of a soft dielectric elastomer coated by compliant electrodes …
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Materials selection for microsystems actuators
… choices for realising high performance MEMS actuators. The thermomechanical design for a generic cantilever bi-layered structure was evolved using a temperature dependent quasi-static analysis. The closed form solutions for mechanical performances (displacement/tip slope, blocked …
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Chemical sensing using polypyrrole actuators
… of colorimetric dyes to the polypyrrole actuators simple sensors can be developed with the actuator acting as a delivery mechanism of the sensor to the sample of interest. This concept has been developed through the use of LED-based detectors and RGB-analysis of digital images.
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Parallel coupled micro-macro actuators
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Conducting polymer actuators : temperature effects
In order to utilize conducting polymer actuators as a viable engineering solution, it is necessary to produce usable levels of force with a reasonable bandwidth. Polypyrrole actuated at temperatures as high as 100 °C increases stress magnitudes by as much as 4x and stress rates by 5x. The effect is …
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Polymer gel actuators and sensors
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Diagnostics for Periodically Operated Actuators
… limited to, diagnostics of periodically operated actuators. These actuators are mechanical or electromechanical systems that experience non-uniform loads during an operating cycle. The platform presented in this thesis serves state-of-the-art vibration and acoustic measurements and combines the …
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Deformations of Piezoceramic-Composite Actuators
… layered piezoceramic and piezoceramic-composite actuators, known as RAINBOW and GRAPHBOW, respectively, that are capable of achieving 100 times greater out-of-plane displacements than previously available has been developed. Prior to the development of RAINBOW and GRAPHBOW, large stacks of …
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Design optimization of permanent magnet actuators.
… describes the design optimization of permanent actuators, of both rotary and linear topologies. Parameter scanning, constrained single and multi-criterion optimization techniques are developed, with due emphasis on the efficient determination of optimal designs. The modelling of devices by …
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Precision Motion Control of Electrohydraulic Actuators
2. Nonlinear dynamics of the electrohydraulic actuator are represented by linear periodic models obtained from linearization about nominal input trajectories and output trajectories corresponding to periodic reference trajectories. The correct identification methodology is developed and utilized. …
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Electrostatic actuators for portable microfluidic systems
… My research centers on electrostatic actuators, due to their conceptual simplicity and the efficacy of electrostatic forces on the microscale. To ensure easy integration with polymer-based systems, and to maintain simplicity in the fabrication procedure, the actuators were constructed …
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Mechanism and applications of elastic actuators
… the mechanics and applications of elastic actuators, with a focus on twisted and coiled polymer actuators (TCPAs) and their integration into robotic systems. TCPAs are fabricated with varying geometric parameters from polymer yarns. The fabrication process includes twisting and coiling …
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Large contraction conducting polymer molecular actuators
… Conducting polymers were chosen for research as actuators, based on a review of the relevant properties of all known actuators and active materials. Key features of conducting polymer actuators include low drive voltages (1 - 2 V) and high active strength (10 - 40 MPa) but moderate active strains …
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Large displacement fast conducting polymer actuators
… on the development of conducting polymer bending actuators in air. There is a strong correlation found between applied voltage, temperature, and the speed of actuation. Several experiments were carried out to determine the effect of temperature on the mechanical, electrical, and electrochemical …
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Electroactive polymer actuators: theory and computations
Electroactive polymer actuators are devices composed of polymeric materials which display mechanical actuation under an applied electric field. This mechanical actuation coupled with the relative compliance of polymeric materials renders electroactive polymer actuators an attractive choice for soft …
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