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 29 for “"vibration energy harvesting"”.
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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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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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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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A New Approach to Wide Bandwidth Energy Harvesting for Piezoelectric Cantilever Based Harvesters
… of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically large inductance. The proposed system intends to …
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Harvesting energy from non-ideal vibrations
Energy harvesting has drawn significant interest for its potential to power autonomous low-power applications. Vibration energy harvesting is particularly well suited to industrial condition sensing, environmental monitoring and household environments where low-level vibrations are commonly found. …
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Low-Power Piezoelectric Energy Harvesting Circuit to Power Wind Turbine Sensors
… and performance. Sensors for acceleration, vibration, temperature, and pressure, can be used to collect data and optimize the performance of a wind turbine. To operate these sensors, a power supply is required. However, using external sources are challenging due to their limited lifetime and …
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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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Multifunctional Piezoelectric Energy Harvesting Concepts
Energy harvesting technology has the ability to create autonomous, self-powered electronic systems that do not rely on battery power for their operation. The term energy harvesting describes the process of converting ambient energy surrounding a system into useful electrical energy through the use …
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Vibration-to-electric energy conversion using a mechanically-varied capacitor
Past research in vibration energy harvesting has focused on the use of variable capacitors, magnets, or piezoelectric materials as the basis of energy transduction. How- ever, few of these studies have explored the detailed circuits required to make the energy harvesting work. In contrast, this …
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Elastomeric microsystems fabricated using transfer printing
… elastomeric microsystems for sensing, actuation, energy harvesting and robotic micromanipulation. Conventionally, microsystems are constructed by rigid materials such as semiconductors, metals, and dielectric materials with a set of well-established processing methods such as thin film deposition, …
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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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