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 12 of 12 for “"high displacement"”.
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Design and Use of Pre-Stressed Unimorphs for High-Displacement, High-Load Applications
… actuator. Applications such as robotics need high-force, high displacement actuators with potential for scaling. Pre-stressed unimorphs, typified by THUNDER™ actuators by Face International Corporation, provide larger displacement than traditional unimorph or bimorph actuators because …
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Model reference control for ultra-high precision positioning systems
Due to the increasing demands of high-density semiconductors, molecular biology, optoelectronics, and MEMS/NEMS in the past decades, control of ultra-high precision positioning using piezoelectricity has become an important area because of its high displacement resolution, wide bandwidth, low power …
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Effects of stress on material properties, intrinsic and extrinsic behavior, and electromechanical response of stress-biased actuators
"New actuator applications demand high displacement and load bearing capacity that can be fulfilled by stress-biased actuators, including Thunder™ (THin UNimorph Driver and sEnsoR). Thunder™ is a composite laminate actuator based on an elastic metal layer and a piezoelectric wafer bonded together …
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Development of methodologies for the assessment of oral prostheses.
… material, in particular to identify areas of high displacement/stress at the interface of the tooth (represented by beechwood) and restorative system. Finite element analysis was also used to identify areas of high displacement in the system used for cyclic load testing. The use of Holographic …
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Development and Analysis of the Lumped Parameter Model of a Piezo-Hydraulic Actuator
… piezohydraulic actuation takes advantage of the high force capabilities that piezoceramics have and combines it with the operation at high frequencies, in order to achieve the hydraulic actuation of a system under a specified stroke and force. High frequency rectification translates the low …
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Biomechanical And Biological Evaluation Of A Model Of Post-Traumatic Osteoarthritis Following Noninvasive, Traumatic Rupture Of The Anterior Cruciate Ligament
… loading protocols was undertaken, and a high-speed, high-displacement protocol was deemed optimal for inducing a repeatable, complete ACL injury. Tibiofemoral joint motion was found to be representative of motion during human injury. Next, a chronic, biological comparison of the …
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Advancing Tendon-Driven Robotic Systems: From Climbing Robots to String Actuators
… framework for designing hybrid climbing robots, highlighting the potential of autonomous solutions for environments where climbing tall structures is critical. Stemming from this climbing robot work is a novel actuator system combining a twisted string actuator (TSA) with a winch mechanism. …
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Fission gas transport and its interactions with irradiation-induced defects in lanthanum doped ceria
… productive in understanding irradiation-induced displacement damage in metal and metal alloy systems. In order to help understand the fundamental mechanisms of irradiation-induced defect formation and evolution in nuclear fuel, similar combined modeling and experimental efforts have been carried …
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Development and Characterization of a Mechanically Prestressed Piezoelectric Composite
… actuators that are capable of meeting the same high displacement and load bearing capabilities exhibited by conventional prestressed devices. The newly proposed mechanically prestressed composite device, or MPC, is similar in form and function to well-documented thermally prestressed devices …
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Displacement rate and temperature effect on asphalt concrete cracking potential
… rutting. Pavements in Illinois road network are highly prone to different sources of cracking because of the climatic conditions and heavy traffic loads. Daily temperature fluctuations and traffic loading are among the external causes of crack initiation and development in pavements whereas …
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Materials selection for microsystems actuators
… of suitable materials 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 …
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Neuroinspired control strategies with applications to flapping flight
… degrees of freedom and need to excite large-displacement oscillations in order to locomote. Combining these factors can make high-level control design difficult. This thesis revolves around three different levels of abstraction, providing tools for analysis and design. First, we consider …