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 9 of 9 for “"Diaphragm Deflection"”.
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Integration of electronic and optical techniques in the design and fabrication of pressure sensors
… A key innovation is introduction of a silicon diaphragm with a center rigid body (or boss), denoted as an embossed diaphragm, that acts as the sensing element for both the electronic and optical parts of the sensor. Physical principles of piezoresistivity and Fabry-Perot interferometry were …
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Forced Vibration Testing and Analysis of Pre- and Post- Retrofit Buildings
… testing (FVT) of two stiff-wall/flexible-diaphragm buildings yielded natural frequencies and mode shapes for the two buildings. The buildings were nearly identical with the exception that one had been retrofitted. Both buildings were comprised of concrete shearwalls and steel moment frames …
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Deep Deck and Cellular Deck Diaphragm Strength and Stiffness Evaluation
Twenty cantilever diaphragm tests were performed in the Structures and Materials Laboratory at Virginia Tech. The tests included both deep deck and cellular deck profiles with varying structural and side-lap connections. The tests were conducted with three different structural connections: screws, …
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Micro Electrostatic Actuation of a Silicon Diaphragm
… pumps, which utilize micro-scale actuating diaphragms. These MEMS (micro-electromechanical system) devices can be actuated by electrostatic forces, which utilize an induced electric field to pull two charged plates towards one another. Such devices were fabricated and electrostatic actuation …
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Design Theory for Channel-less, Low-Pressure, Pressure-Compensating Drip Emitters
… design theory hypothesizes that as the flexible diaphragm deflects and begins to cover the offset outlet, the gap that flow is able to exit through decreases producing a hydraulic resistance that allows for a constant flow rate. To define this moment of activation, an analytical structural model …
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Design and fabrication of a MEMS-array pressure sensor system for passive underwater navigation inspired by the lateral line
… and thin silicon diphragms. Measurements of the diaphragm deflection and strain-gauge resistance changes in response to changes in applied external pressure confirm that the devices can be reliably calibrated for use as pressure sensors to enable passive navigation by AUVs. A set of sensors with …
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Horizontal Stiffness of Wood Diaphragms
… was conducted to study the stiffness of wood diaphragms. Currently there is no method to calculate wood diaphragm stiffness that can reliably account for all of the various framing configurations. Diaphragm stiffness is important in the design of wood framed structures to calculate the …
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Study of Size Reduction, Reliability and Lead Safety of an Intra-Cochlear Lead-Zirconate-Titanate Micro-Actuator
… intra-cochlear micro-actuator is a square PZT diaphragm anchored at all four edges forming a tiny speaker. The purpose of this dissertation is to address three major challenges encountered while developing next-generation micro-actuators. They are size reduction, reliability and lead safety. …
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Design of One-Story Hollow Structural Section (HSS) Columns Subjected to Large Seismic Drift
… undergoing large lateral drifts associated with deflections of the vertical seismic force resisting system and deflections of the flexible roof diaphragm. Analyzing the behavior of these gravity columns is complex since not only is there an interaction between compression and bending, but also …