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 61 for “"Vibration Energy"”.
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Energy-efficient Interfaces for Vibration Energy Harvesting
… batteries have thus far remained the primary energy sources for such systems despite the finite associated lifetimes imposed due to limitations associated with energy density. However, certain applications (such as implantable biomedical electronic devices and tire pressure sensors) require …
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Downhole vibration sensing by vibration energy harvesting
… design of a prototype electromagnetic induction vibration energy harvesting device for use in a downhole environment. First order models of the necessary components for a generic vibration energy harvester are presented and used to predict the most sensitive parameters for the design of energy …
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Low-frequency, low-amplitude MEMS vibration energy harvesting
Vibration energy harvesters work effectively only when the operating conditions match with the available vibration source. Typical resonating MEMS structures cannot be used with low-frequency, low-amplitude and unpredictable nature of ambient vibrations. Bi-stable nonlinear oscillator based energy …
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The Convergence of Parametric Resonance and Vibration Energy Harvesting
Energy harvesting is an emerging technology that derives electricity from the ambient environment in a decentralised and self-contained fashion. Applications include self-powered medical implants, wearable electronics and wireless sensors for structural health monitoring. Amongst the vast options …
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Nonlinear beam-based vibration energy harvesters and load cells
… of oscillator parameters. Various human motion energy harvester configurations that use the nonlinear spring were numerically optimized for power, robustness, and adaptivity. Based on the optimization results, both the nonlinear and linear devices studied in this thesis generate more power per …
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Optimisation and frequency tuning concepts for a vibration energy harvester
… electronics has far outpaced the scaling up of energy density in batteries. Therefore, a great deal of research has been carried out to search for alternative power sources that can replace or enhance the conventional battery. Energy harvesting (also known as energy scavenging) is the process …
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Modeling and design of a MEMS piezoelectric vibration energy harvester
… and design of MEMS-scale piezoelectric-based vibration energy harvesters (MPVEH) are presented. The work is motivated by the need for pervasive and limitless power for wireless sensor nodes that have application in structural health monitoring, homeland security, and infrastructure monitoring. …
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Materials and device design for MEMS piezoelectric mechanical vibration energy harvesters
Piezoelectric vibration energy harvesters (PVEHs) for microelectromechanical systems (MEMS) have received considerable attention as an enabling technology for self-powered wireless sensor networks. MEMS-PVEHs are particularly attractive because of the potential to deliver power indefinitely and …
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A power electronic approach to improved dual-frequency vibration energy harvesting
Vibration energy harvesters may be used as power sources for low-power, self-sufficient, wireless industrial sensors. State-of-the-art vibration energy harvesting uses switching power electronics to synthesize compact conjugate matched loads allowing for maximum harvested power. Previous work …
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Nonlinear vibration energy harvesting : fundamental limits, robustness issues, and practical approaches
The problem of a scalable energy supply is one of the biggest issues in miniaturizing electronic devices. Advances in technology have reduced the power consumption of electronic devices such as wireless sensors, data transmitters, and medical implants to the point where harvesting ambient …
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Nonlinear vibration energy harvesting by intentional excitation of high-frequency dynamical instability
In this thesis, a vibration-based energy harvesting system utilizing essential (nonlinearizable) nonlinearities and various electromechanical coupling elements is investigated. These elements include electromagnetic and piezoelectric methods of energy conversion. The mechanical system of interest …
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A 1-mW vibration energy harvesting system for moth flight-control applications
… and methodologies required to build a 1-mW energy-harvesting system for moth flight control applications. The crepuscular hawk moth Manduca sexta is the chosen test subject. This project is part of the Hybrid Insect MEMS (HI-MEMS) program. The objective of the program is to establish an …
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Vibration Energy Harvesting for the Development of autonomous monitoring Systems. Application to railway Bridges
This doctoral thesis investigates vibration-based energy harvesting as a power source for autonomous monitoring systems in railway infrastructure. The research focuses on the modelling, optimisation, and validation of piezoelectric (PEH) and magnetoelastic (MEH) energy harvesters, with particular …
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Vibration Energy Harvesting IC Design with Incorporation of Two Maximum Power Point Tracking Methods
The proposed vibration energy harvesting IC harvests energy from a piezoelectric transducer (PZT) to provide power for a wireless sensor node (WSN). With a traditional rectification stage, a two-path three-switch dual-input dual-output architecture is adopted to extract power and regulate the …
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Towards and embeddable structural health monitoring sensor : design and optimization of MEMS piezoelectric vibration energy harvesters
… a practical implementation of this technique. Vibrational energy harvesting using MEMS piezoelectric resonant devices is an appealing solution to this challenge due to their relatively high potential for power generation (compared to other harvesting techniques) and capacity to be integrated …
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A study of a piezoelectric energy harvesting system using magnetorheological fluids
This thesis reports the study of a piezoelectric energy harvesting system using a thin layer of magnetorheological fluid as a soft impact mechanism to enhance the frequency of the energy generator. Currently, the major bottleneck of vibration energy harvesting is the dynamic nature of vibrations in …
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Energy harvesting of random wide-band vibrations with applications to an electro-magnetic rotational energy harvester
In general, vibration energy harvesting is the scavenging of ambient vibration by transduction of mechanical kinetic energy into electrical energy. Many mechanical or electro-mechanical systems produce mechanical vibrations. The kinetic energy associated with these mechanical vibrations represents …
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Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions
Instead of dissipating vibration energy into heat waste via viscous damping elements, this dissertation proposes an innovative vibration control method which can simultaneously mitigate vibration and harvest the associated vibration energy using electromagnetic energy harvesters. This dissertation …
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Raynaud's phenomenon of occupational origin
… grinding operations in which there is increasing vibration energy entering the hands and arms of operators. The vibration stimulus causes digital artery changes giving rise to Raynaud's Phenomenon of Occupational Origin.
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Broadband Piezoelectric Energy Harvesting and Vibration Suppression Using Nonlinear Mechanisms
Harvesting ambient vibration energy provides a promising solution to implement self-powered microwatts to milliwatts low-power electronic devices, as an alternative to batteries. Due to the high power density and simple construction, piezoelectric transducers have attracted the most attention in …
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