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.
Results
Showing 1 to 13 of 13 for “"Piezoelectric Actuation"”.
-
Material characterization and modeling for piezoelectric actuation and power generation under high electromechanical driving levels
High electromechanical loads parallel to piezoelectric polarization might result in depolarization of the material, depending on the material property itself and the external excitations such as electrical field, electrical driving frequency, stress and stress duration. In this work, material …
-
Control of Dynamic Response of Thin-Walled Composite Beams Using Structural Tailoring and Piezoelectric Actuation
… exploits the actuating/sensing capabilities of piezoelectric materials bonded or embedded into the host structure. Various control laws relating the piezoelectrically-induced bending moment with combined kinematical variables characterizing the response at given points of the structure are …
-
Design of an active compressor blade for aeroelastic studies
… flexible outer foam shell, structural spars, and piezoelectric actuators. The graphite epoxy spars both carry the load of the blade and induce shape changes of the blade from attached piezoelectric actuators. Control of a blade shape and position to the airflow allows new experiments to be …
-
Technological process for the fabrication of a MEMS microswitch actuated by a PZT thin film
… technologies. About MEMS microrelay, piezoelectric actuation offers the advantages of low power consumption, low actuation voltage, low actuation time and long life time. Actuators and microrelays based on piezoelectric thin films are usually made of silicon, exploiting SOI wafers. The …
-
Control of AFMs in contact mode
… rely on photodiode detector (PSD) sensing and piezoelectric actuation. The change in probe-surface contact is a disturbance created by scanning across a surface. This disturbance is to be rejected to maintain probe-surface contact and thus allow proper surface characterization. AFM feedback …
-
Performance Modeling and Efficiency Analysis for a Piezohydraulic Pump with Active Valves
Piezoelectric actuation is an expanding field that makes use of piezoelectric materials that have high power density as actuators. These actuation systems have the potential higher power density than the traditional servo motor technology. However, due to tiny strain of the piezoelectric materials, …
-
Edge-defined film-fed growth of single-crystal piezoelectrics
… oriented single-crystals, of a high-strain, piezoelectric material. Recently, unusually high electrostrictive and piezoelectric actuation has been observed in polycrystals and flux-grown <100> single-crystals of ... Using seeded, Edgedefined Film-fed Growth (EFG) and the related Stepanov …
-
Design and Validation of a High-Bandwidth Fuel Injection System for Control of Combustion Instabilities
… The two systems were successfully built with piezoelectric actuation to drive the prime movers proportionally up to 800 Hz. Discussed in this thesis are the important constituents of the fuel injection system that affect heat release authority: the method of fuel modulation, uncoupled dynamics …
-
Structural-acoustic design and control of an integrally actuated composite panel
… is application motivated in that the sensing and piezoelectric actuation occur solely at the structure while the performance is measured in the acoustic field. The conclusions consider the analytically predicted performance along with the corresponding experimental achievement to develop an …
-
Structural dynamics modeling of helicopter blades for computational aeroelasticity
… The twist response of ATR blade due to applied piezoelectric actuation is obtained and the result compared with published results. A good qualitative agreement between the present aeroelastic solution and reference results was obtained. However, quantitative discrepancies were encountered that …
-
Electrostatic actuators for portable microfluidic systems
… to electromagnetic, thermopneumatic, or piezoelectric actuation principles. However, none of these strategies maintain the proper balance of simplicity, functionality, and ease of integration. My research centers on electrostatic actuators, due to their conceptual simplicity and the …
-
Active control of sound transmission/radiation from elastic plates using multiple piezoelectric actuators
… radiation from elastic plates with the use of piezoelectric transducers as actuators. A strain-energy model (SEM), based upon the conservation of strain energy, for a laminate beam with attached or embedded finite-length spatially distributed induced strain actuators was first developed to …
-
Advanced instrumented stamps for micro transfer printing and novel application areas
… composite material with distributed sensing, actuation and compliance tuning, new stamp architectures are developed. These novel stamps replace the compliance of a bulk PDMS stamp with active functional structures with tunable stiffness; without effecting the ability of the stamps to be used …