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 16 of 16 for “"Piezo electric"”.
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A piezo-electric internal combustion engine indicator
Typescript, etc.
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Mobile power plants : waste body heat recovery
… heat into useful and useable amounts of electricity were studied. Thermoelectric, magneto hydrodynamic, and piezo-electric energy conversions at the desired scope were evaluated to understand their role and utility in the efficient conversion of waste body heat. The piezo-electric …
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Piezoelectric Control of Structures Prone to Instabilities
… prone to these forms of instability using piezo-electric actuators is the theme of this dissertation. Issues involved in the control of stiffened panels under axial compression and liable to buckle simultaneously in local and overall modes are studied. The analytical approach employs finite …
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Sensing for Electromechanical Systems
… systems, for example, pumps, compressors, and electric machines, are the foundation of modern society. Condition monitoring of these systems is crucial for efficient operation and operator safety. Modern electronics enable new developments in electromechanical system condition monitoring. In …
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On the Statistical Nature of Boiling Flows - an Experimental Approach
… vapor fraction, were studied. Matched piezo-electric pressure transducers were used for the pressure fluctuation measurements, and a linearized dual-beam x-ray system was used for the vapor fraction measurements. Steady state (mean) thermal-hydraulic condition in the last section was …
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Micro laser personal projector
… fixed plano-convex lens focuses all 50 lasers. A piezo-electric device will be used on the future to increase the laser projector's image resolution from 50 x 480 to 200 x 480 pixels. With this image resolution the Micro Laser Personal Projector can be used in communications, entertainment, and …
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Kinetics of hydrogen evolution and absorption during electrochemical reactions as determined by monitoring the volume of hydrogen bubbles
The piezo electric technique (P.E.T) devised in this department is a highly sensitive method for measuring the total volume of gas bubbles suspended in a solution. This is achieved by simply performing a static compressibility test, causing small pressure fluctuations in the volume of a solution …
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Empirically derived guidelines for touch screen targets
… was conducted in a grocery store using a piezo-electric monitor in a public access kiosk. Participants pressed the screen as target squares appeared one at a time. Visual target size, horizontal viewing location, and screen sector of target were varied. X and Y offset between the target …
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Rough Surface Interactions of Micro/nano-Scale Contact Systems
… using a newly developed instrument, where two piezo-electric actuators were used to control normal and tangential motions of the contacting bodies and the interactive forces were measured from a capacitive high-resolution force transducer. The measured interactive forces were examined in …
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Turbo Charged Low Temperature Combustion - Experiments, Modeling and Control
… feedback is therefore necessary. To this end, piezo-electric pressure sensors, an ion current sensor and a high precision torque sensor were evaluated as feedback sensors that could potentially provide this data. The piezo-electric pressure transducer was found to be superior to the …
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Discovery of acoustic emission based biomarker for quantitative assessment of knee joint ageing and degeneration
… symmetry. For AE burst signals acquired from piezo-electric sensors attached to the knee joints during repeated sit-stand-sit movements, the statistical analysis started from the quantity of AE events in the proposed four movement phases and extended to waveform features extracted from AE …
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Adjoint-based optimization for inkjet printing
… first type is finding a velocity profile of the piezo-electric actuator that eliminates residual oscillations after a droplet is ejected. The cost function is the sum of the acoustic energy in the channel and the surface energy of the spherical cap of ink at the end of the nozzle at a given time. …
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Nuclear magnetic resonance spectroscopy and ultrasound
… high frequency generator is used to drive PZT piezo-electric transducer via various transducer to liquid coupling arrangements. A commercial instrument of 20 kilo-hertz has also been employed to test the above hypothesis and also to demonstrate the usefulness of ultrasound in sonochemistry. The …
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Advanced Time Domain Sensing For Active Structural Acoustic Control
… resonances of the structure. Single-sided piezo-electric actuators provide the structural control inputs while the sensor estimates are used as error signals. The controller is based on the filtered-x version of the adaptive LMS algorithm. Results from both analytical and experimental …
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Vibration assisted machining: Modelling, simulation, optimization, control and applications
… out for both the machine structure and the piezo-actuator device. The instrumentation implementation mainly includes the design of the desktop vibration assisted machining system and its control system. The machining system consists of a piezo-driven XY stage, air bearing spindle, jig, …
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Aktive Geräuschminderung des Drehklangs axialer Turbomaschinen durch Strömungsbeeinflussung
… Schallquellen zu bilden. Letztere wurden mittels piezo-elektrischen Aktuatoren auch für eine dynamische Beeinflussung der Strömung verwendet. Mit den Piezo-Elementen konnten Pegelminderungen bis zu 10 dB erreicht werden. Den Schwerpunkt der Untersuchungen bildete die Geräuschminderung durch …