Browsing by Subject "piezoelectric"
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Item Ceramic-Polymer Additive Manufacturing System for Ultrasound Transducers(University of Texas at Austin, 2012) Cheverton, Mark; Singh, Prabhjot; Smith, Scott; Chan, Kwok PongA modified multi-layer lithography process is used to additively manufacture highresolution netshape ceramic structures by photopolymerizing a ceramic-polymer slurry using structured light patterns. This paper will discuss the development of a low-cost, high speed manufacturing process method for the fabrication of piezoelectric ceramic transducer elements in the 1-25 MHz frequency range. The key considerations in the development of the process including the selection and optimization of slurry materials for the deposition of PZT 5H materials, optical exposure parameters, debinding/sintering profiles, process monitoring, and post manufacturing processing. Ongoing work includes improvements to the materials properties, improved throughput and geometric fidelity.Item Fatigue Analysis of a Gallop-based Piezoelectric Wind Energy Harvester and Strategies for Long-Term Performance Optimization(2021-12) Trostle, Andrew; Sirohi, JayantWith great demand for novel forms of renewable energy, there has been substantial interest in wind energy harvesting based on aeroelastic excitations with the aid of piezoelectric materials. While most research has been dedicated to optimizing power output [17], relatively little research has been done on the device’s behavior in response to fatigue, which may be a key failure mode given its persistent cyclic loading. A Python program was created to simulate a galloping piezoelectric wind energy harvesting (GPEH) under varying wind conditions in real time, monitoring performance metrics until fatigue failure. This can generate Monte Carlo distributions for optimizing GPEH system parameters for durability. This could then determine if such a form of renewable energy is currently feasible and if so, provide a database of effective materials for the device’s implementation. In tandem with this, analytical optimization methods were tested, but remain partially inconclusive, requiring better dimensional analysis to simplify the myriad of system parameters. However, initial runs of the code still provided useful data, identifying an optimal performance state of all those tested, indicating that the tradeoff between performance and durability is not either-or.