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 32 for “"self-sensing"”.
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Experimental and theoretical investigation of self-sensing CNTs-based cementitious composites [Indagine sperimentale e teorica sui compositi cementizi self-sensing a base di CNTs]
… analitica e numerica di compositi cementizi self-sensing a base di CNTs. È stata condotta un’ampia campagna sperimentale per valutare in modo sistematico gli effetti di differenti tipi di matrice e agenti disperdenti sul comportamento meccanico, elettrico ed elettromeccanico dei compositi …
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Development of a Self-Sensing and Self-Healing Bolted Joint
A self-sensing and self-healing bolted joint has been developed. This concept encompasses the areas of health monitoring, joint dynamics and smart materials. In order to detect looseness in a joint the impedance health monitoring method is used. A new method of making impedance measurements for …
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Development and Design of Self-Sensing SMAs using Thermoelectric Effect
Active research of SMAs has shown that its Seebeck coefficient is sensitive to its martensitic phase transformation and has the potential to determine the SMAs state of transformation. The combination of Shape Memory Alloys, which have a positive Seebeck coefficient, and Constantan which has a …
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Design and control of a self-sensing piezoelectric reticle assist device
This thesis presents the design and control techniques of a device for managing the inertial loads on photoreticle of lithography scanners. Reticle slip, resulting from large inertial loads, is a factor limiting the throughput and accuracy of the lithography scanners. Our reticle-assist device …
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Damage detection in composite materials using acoustic emission and self-sensing fibres
… the abilities of acoustic emission testing and self-sensing fibres to detect damage in composite materials. This was achieved by performing acoustic emission testing on fibre samples and resin samples during tensile tests. In parallel to the acoustic emission testing the changes in strain for …
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Multi-functional, self-sensing and automated real-time non-contact liquid dispensing system
… liquid. In contrast, the SmartPin has intrinsic self-sensing capability to not only control the process of liquid dispensing, but also the results of the dispensed liquid in real time. The dual purpose fiber optics sensor/plunger is able to detect the status of liquid morphology under dispensing, …
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Multi-physics Modeling and Calibration for Self-sensing of Thermomechanical In-plane Microactuators
… Within MEMS much research has focused on sensing and actuation. This thesis presents work on a particular actuator of interest, the thermomechanical in-plane microactuator (TIM). Recent work has shown the possibility of a novel approach of sensing mechanical outputs of the TIM without …
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Compliant, Large-Strain, and Self-Sensing Twisted String Actuators with Applications to Soft Robots
… soft robots, compliant, large-strain, and self-sensing TSAs are developed and applied to various soft robots in this work. The design was realized by replacing conventional inelastic strings with compliant, thermally-activated, and conductive supercoiled polymer (SCP) strings. Self-sensing …
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Design and Performance of Intrinsic Self-sensing Cementitious Composites for Smart Structural Health Monitoring of Civil Infrastructure
Intrinsic self-sensing cementitious composites which simultaneously own the load bearing capacity and self-sensing capacity, have attracted increasing research interests in recent years to fulfil the multifunctional requirements for the next generation of biomimetic, intelligent and resilient …
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Developing Active Artificial Hair Cell Sensors Inspired by the Cochlear Amplifier
… In the present work, multi-channel and self-sensing active artificial hair cells (AHCs) made of piezoelectric cantilevers and controlled by a cubic damping feedback controller are developed numerically and experimentally. These novel AHCs function near a Hopf bifurcation and amplify or …
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Graphite-enabled Cementitious Composites: A Smart and Resilient Solution for Future Infrastructure
… as conductive fillers to develop an intrinsic self-sensing concrete to monitor structures without the need for embedded, attached, or remote sensors while maintaining or improving its mechanical properties and durability. Graphite is a particularly attractive filler to use in practical …
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Integrated Piezoresistive Sensing for Feedback Control of Compliant MEMS
… its broader use is the small number of on-chip sensing options available to MEMS designers. A method of using integrated piezoresistive sensing is proposed and demonstrated as another option. Integrated piezoresistive sensing utilizes the inherent piezoresistive property of polycrystalline …
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Disturbance attenuation with multi-sensing servo systems for high density storage devices
… control topologies incorporating multi- and self-sensing (employing the actuator as a sensor simultaneously) sampled-data servo systems are proposed with specific considerations on sensor fusion issues for actuator-sensor collocation and high SNR (Signal-to-Noise Ratio). Improved …
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The Piezoresistive Effect In Microflexures
… control of microdevices, nanopositioning, and self-sensing microdevices.
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An artificial skeletal muscle for use in pediatric rehabilitation robotics
… Dielectric Elastomer and Hydraulically Amplified Self-Healing Electrostatic. ☐ In Aim 2, the electro-mechanical properties of a commercially available CTsystems’ stacked DEA (CT-SDEA) were benchmarked. CT-SDEA observed properties were then compared with the reported values for mammalian skeletal …
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Macro-Fiber Composites for Sensing, Actuation and Power Generation
… Langley Research Center for two major themes, sensing and actuation for vibration control, and power harvesting. The MFC is constructed using piezofibers embedded in an epoxy matrix and coated with Kapton skin. The construction process of the MFC affords it vast advantages over the …
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Crack Detection in Aluminum Structures
… several different piezoceramic materials as self-sensing actuators and sensors. The structures are a simple beam and a more complex lug element used in aircraft applications. The approach suggested here is to use the impedance and vibration methods to detect crack initiation and then to use …
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Impedance-Based Structural Health Monitoring of Wind Turbine Blades
… can damage other blades, the wind turbine itself, and possibly other wind turbines. A successful structural health monitoring (SHM) system incorporated into wind turbines could extend blade life and allow for less conservative designs. Impedance-based SHM is a method which has shown promise …
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Mitigating IPMC Back Relaxation Through Feedforward and Feedback Control of Patterned Electrodes
… electrodes to produce complex motion or even self-sensing capabilities. In this work, however, a new controltechnique is proposed, allowing the IPMC sectors to be actuated in opposite directions such that the back relaxation components counteract each other. A feedforward control method is …
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Triply Periodic Minimal Surface Lattices for Mechanically Tuning Structures and Designing Multifunctional Devices
… (1) load bearing, (2) energy storage, and (3) self-sensing deformations. To characterize the load bearing capabilities, I studied the mechanical properties of four elastomeric gyroid unit cells. My analysis includes finite element models verified with 3D printed samples tested under compression …
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