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 37 for “"linear actuators"”.
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Fabrication and use of conducting polymer linear actuators
… devices will benefit from the incorporation of actuators with combinations of properties common to biological systems, for example low density, controllable mechanical flexibility, and compact size. Conducting polymers, such as polypyrrole, exhibit muscle-like properties and the potential to …
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Design Concepts for High-Acceleration Linear Actuators for Precision Motion
… these advancements are electromagnetic actuators responsible for positioning the long-stroke (LS) and short-stroke (SS) stages of the reticle stage in its scan direction. Such actuators need to provide the highest thrust at the deceleration and reacceleration phases when the stages turn …
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Fast access optical disk drives--a comparison of rotary and linear actuators
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Design of a cam and follower linear actuator for satellite optical systems
… system. Optical alignment is achieved though linear actuators, which constrain different degrees of freedom of the optical system. Optical systems require precise alignment, meaning the linear actuators that align them must have precise resolutions. During satellite launch, the satellite …
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Triple Scissor Extender : A 6-DOF lifting and positioning robot for autonomous aircraft manufacturing
… extend towards the ceiling with 6 independent linear actuators moving the base ends of the individual scissors. The top point of each scissor is connected to one of three ball joints located at the three vertices of the top triangular plate holding the end-effector. Coordinated motion of the 6 …
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Series Elasticity in Linearly Actuated Humanoids
… is based on several years of developing novel actuators for two full-scale linearly actuated compliant humanoid robots, SAFFiR and THOR. Both are state-of-the-art robots intended to operate in the extremely challenging real world scenarios of shipboard firefighting and disaster response. The …
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Investigation on new low cost electronically controlled fuel metering systems for small gas turbine engines
… metering valve, which is actuated by a digital linear actuator. In the second one, both the metering and the bypass valves are controlled by two independently operated digital linear actuators. The mathematical models for the first fuel metering system, were created and used for computer …
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Plant design for deterministic control of STEMS and tale-springs
In this thesis, the limits of conventional linear actuators for long stroke applications are discussed, and tape-spring based actuators such as the STEM are introduced as an alternative solution. While the literature contains several assessments of self-deploying tape-springs, little exists in the …
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Design and fabrication of a two degree-of-freedom hopping robot with parallel architecture using linear Lorentz-force actuators
… and fabrication of a 2-DOF robotic leg using linear Lorentz-force actuators arranged in a parallel configuration. The decision to use linear actuators, a parallel architecture, and Lorentz-force motors was made because of distinct differences between these designs and the alternatives, …
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Design and Implementation of Stewart Platform Robot for Robotics Course Laboratory
… using MATLAB. The platform was then built using linear actuators, magnetic spherical bearings, and acrylic plates. Control of the Stewart Platform is achieved using an Arduino Due and a custom HexaMoto shield. Users interact with the system using a GUI created with MATLAB’s App Designer.</p>
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On Designing Compliant Actuators Based On Dielectric Elastomers
… solid-state mechatronic devices, in particular linear actuators, which are more integrated, lightweight, economic, silent, resilient and disposable than equivalent devices based on traditional technologies. Such systems may have a huge impact in applications where the traditional technology does …
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Manipulator’s configuration design, excavation path generation, and underground object detection for an autonomous electric excavator
… fabricate an excavator with parallel electrical linear actuators. The second one is to develop and test the PSO-based and PFM-Based path generation algorithms for this excavator in order to save energy, maintain the digging efficiency, and avoid colliding with underground objects. In addition, …
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Error analysis of motion transmission mechanisms : design of a parabolic solar trough
… and resulted in a final design that uses two linear actuators to rotate a monolithic parabolic trough over a 2600 range. A measure of efficiency, based on the geometric tracing of incident and reflected rays under different parabola deformations, was developed and used to determine the impact …
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Self-Assembling Modular Systems: Enhancing Efficiency and Accuracy in Robotic Lattice Assembly
… system elements, (2) the advancement of modular linear actuator designs that not only facilitate component rearrangement but also contribute to task performance, and (3) improved performance and efficiency of lattice-assembler robots. All topics are examined in depth, and their relevance to prior …
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Synthesis and characterization of conducting polymer actuators
… stimuli and have been utilized as linear actuators. To date, the most successful mechanism for actuation is ionic ingress and egress, though mechanisms based on conformational changes and molecular interactions have also been proposed. In the pursuit of new conducting polymer …
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Application of Koopman Operator Theory to Legged Locomotion
Nonlinearities from complicated robot systems and harsh contact dynamics have long impeded the effectiveness of optimal control strategies for legged robots. In this work, we present a linearized simple walking model using Koopman Operator Theory, and its usage in Linear Model Predictive Control …
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A high-deformation electric soft robotic gripper via handed shearing auxetics
… a new class of electrically-driven soft robotic actuators built from handed shearing auxetics (HSAs). Soft robots - robots made out of more compliant materials such as rubber and silicone - are significantly more robust and safer than their rigid-bodied counterparts due to their intrinsic …
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Design of an electro-mechanical hexapod for accelerated life testing of optical fiber assemblies
… design. The test apparatus design utilizes six linear actuators to replicate the movement of the fiber system deployed on HETDEX for over 65,000 accelerated cycles, simulating five years of actual operation. The electro-mechanical test apparatus will provide insight into the effects of load …
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An investigation of the measurement, fixturing, and trimming of large sheet metal parts
… the promising measurement system is a precision linear actuator. A proposed design, consisting of cascaded solenoids and mechanical stops, is evaluated and shown to be unacceptable since commercial linear actuators perform the function more accurately and for lower cost.
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