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 175 for “"Mechanical energy"”.
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Electrochemical to mechanical energy conversion
… intercalation of graphite can achieve actuation energy densities of 6700 kJ m-3 with strains up to 6.7%. Intercalation oxides provide strains on the order of a couple percent, but allow for increased bandwidth. Using a conventional stacked electrode design, a cell consisting of lithium iron …
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Electrochemically driven mechanical energy harvesting
Efficient mechanical energy harvesters enable various wearable devices and may also act as auxiliary energy supply to isolated area. In this thesis, I present a novel class of mechanical energy harvesters based on stress-voltage coupling in electrochemically alloyed electrodes. The device consists …
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Mechanical energy storage in carbon nanotube springs
Energy storage in mechanical springs made of carbon nanotubes is a promising new technology. Springs made of dense, ordered arrays of carbon nanotubes have the potential to surpass both the energy density of electrochemical batteries and the power density of capacitors due to the effective Young's …
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Modelling and development of thermo-mechanical energy storage
Pumped thermal energy storage (PTES) and liquid air energy storage (LAES) are two technologies that use mechanically-driven thermodynamic cycles to store electricity in the form of high-grade thermal energy, employing abundant materials that are kept in large insulated tanks. Both technologies are …
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Shape and Topology Optimization for electro-mechanical energy converters
… requires high-efficiency electro-me- chanical energy converters, in particular electrical rotating machines, at the lowest possible cost. The use of modern power electronics converters at all levels of elec- trical power applications, involves, on the other hand, switching components with very …
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Modeling of mechanical energy dissipation of low-dimensional resonators
Nanoelectromechanical systems (NEMS) made from low-dimensional materials based on carbon, transition metal dichalcogenides, and their combinations have opened up new possibilities in high-precision sensing, signal processing, and studies of fundamental physical phenomena. In the heart of the NEMS …
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Computational Design of Viscoelastic Gels with Tunable Mechanical Energy Dissipation
… development of engineered materials that exhibit mechanical characteristics similar to biological tissues can enable testing the effect of ballistics and designing of protective equipment. The physical instability of existing tissue simulants over long times and ambient temperatures has propelled …
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A comparative analysis and optimisation of thermo-mechanical energy storage technologies
Electrical Energy Storage (EES) can decouple energy production from its consumption and is urgently needed by both conventional energy system for load leveling and renewable energy system for intermittency smoothing. Currently, Pumped Hydro Energy Storage (PHES) and Compressed Air Energy Storage …
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Mechanical Energy Harvesting for Powering Distributed Sensors and Recharging Storage Systems
Vibration energy harvesting has been widely investigated by academia and industry in the past decade with focus on developing distributed power sources. One of the prime goals of energy harvesters is to provide power to wireless sensors allowing for the placement of these sensors in the remote and …
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Ferroelectric/piezoelectric flexible mechanical energy harvesters and stretchable epidermal sensors for medical applications
… suggest utility in a variety of sensors and energy harvesting components, with lightweight construction, attractive mechanical properties and potential for implementation over large areas, with promising application in unusual bio-integrated electronics, such as self-powered cardiac …
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Effects of various loads and speeds on the mechanical energy of climbing and climbing mechanics
… various loads and speeds on the kinematics and mechanical energy of climbing during performance on a climbing exercise device. Thirty-six subjects (18 males and 18 females) participated in the study and were deemed to be in good physical condition and free from diseases based on the findings of …
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Ultrafast dynamics in complex molecular solids: Ultrafast imaging of laser ablation of PMMA and theory of mechanical energy flow in ultrahot crystalline naphthalene
… solid, there is an ultrafast transfer of energy between the internal molecular vibrations and the external modes or lattice vibrations. Two interesting examples involving this energy transfer are presented in this thesis. First, an ultrafast imaging apparatus is constructed and used to …
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Bending mechanism for piezoelectric transducer footstep energy harvesting using piezoelectric tile
The technologies for energy harvesting technologies using human body action have attracted much attention as alternative resource to replace the common energy resources that have been exhausted in these few decades. Piezoelectric material that has been widely used in sensor technologies is able to …
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The Acoustic Expander: A New Expansion Machine for Use in Cryogenic Refrigeration
… Cryogenic expansion machines produce mechanical energy from the expansion of a working fluid from high-pressure to low-pressure thereby cooling the low-pressure fluid for use in refrigeration. The novelty of the acoustic expander is that the mechanical energy is transferred through a …
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Design, Modeling and Tests of Electromagnetic Energy Harvesting Systems for Railway Track and Car Applications
… study proposes various methods to harvest the mechanical energy present in railcar suspensions and railroad tracks to generate electricity that is suitable for onboard or trackside electronics, using electromagnetic generators. Compact electromagnetic energy harvesters that can be installed …
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Theory of piezoelectric materials and their applications in civil engineering
… of this thesis is to explore ways of harvesting energy from a building. To be more specific, the conversion of mechanical energy into electrical energy using piezoelectric materials is studied. Applications of piezoelectric materials as actuators are also explored, with particular interest in the …
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Control and design of multi-use induction machines : traction, generation, and power conversion
… in its primary role of transforming electrical energy into mechanical energy. One way of doing this is to design the machine with multiple stator windings where one winding acts as a primary for drive and power, and the others as secondaries for electrical power. The challenge is to control the …
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Composite Structural Health Monitoring With Piezoelectric Wafer Active Sensors
… the piezoelectric principle to convert electric energy to mechanical energy or mechanical energy back to electrical energy. This type of sensor can be readily mounted on the existing structures or embedded into them during the manufacturing process without degrading the structural performance. …
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Processing and Characterization of Extruded Zein-Based Biodegradable Films
… during processing. It was observed that higher mechanical energy treatment progressively disrupted zein molecular aggregates, resulting in a more uniform distribution of individual zein molecules. With the incorporation of oleic acid as plasticizer and monoglycerides as emulsifier, zein formed …
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Structural magnetic induction dampers in buildings
… magnetic induction dampers for dampening mechanical vibrations in buildings subjected to strong dynamic excitations. The concept of energy harvesting in various fields of engineering is first examined. Then it is applied to the design of magnetic induction dampers in buildings. Various …
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