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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 36 for “"Bimorph"”.
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Optimization studies of thermal bimorph cantilevers, electrostatic torsion actuators and variable capacitors
… given for three kinds of MEMS devices: thermal bimorph cantilevers, electrostatic torsion actuators, and variable capacitors. Calculation, simulation, and experimental data are used to confirm the device behavior and demonstrate the application of the design approaches. For thermal bimorph …
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The study of weak ferromagnetism by andreev reflection spin spectroscopy and development of bimorph electro-thermal actuators
<p>It is well accepted that spin polarization of materials has a major role in spintronics to improve the efficiency of spintronic devices. Point contact Andreev reflection (PCAR) spectroscopy, one of the most popular and reliable techniques, was used to obtain the conductance and by analyzing them …
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Aerodynamic and Electromechanical Design, Modeling and Implementation Of Piezocomposite Airfoils
… of Macro-Fiber Composite based unimorph and bimorph structures is analyzed. A distributed parameter electromechanical model is presented for interdigitated piezocomposite unimorph actuators. Necessary structural features that result in large electrically induced deformations are identified …
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AN INVESTIGATION OF NOVEL HIGH-SPEED ACTUATORS FOR SOFT PRODUCT ASSEMBLY AND MANIPULATION
… form of actuation considered was a piezoceramic bimorph. Similar in principle to the magnetostrictive material the piezoceramic bimorph deflects due to an applied voltage. The bandwidth of the bimorph is high and the relative cost of the material low. From the results of simulation and …
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Numerical Modeling of Synthetic Jets in Quiescent Air with Moving Boundary Conditions
… the diaphragm. The actuators modeled are typical Bimorph and Thunder piezoelectric actuators. The initial conditions for the actuators are obtained experimentally resulting in 0.396mm and 0.07mm respectively when driven with a sinusoidal wave input at 1524 V/m and 4064 V/m. Although the velocity …
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Design, Simulation, and Wind Tunnel Verication of a Morphing Airfoil
… airfoil is designed with embedded MFCs in a bimorph configuration. The deflection capabilities under actuation are predicted with the commercial finite element package NX Nastran. Placement of the piezoelectric actuator is studied for optimal effectiveness. A thermal analogy is used to …
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A demonstration of useful electric energy generation from piezoceramics in a shoe
… demonstrated conditioning schemes. A rigid, bimorph piezoceramic transducer was developed and integrated into an off-the-shelf orthopedic insert. The insert consists of two THUNDER™ PZT unimorphs connected in parallel and mounted on opposing sides of a Be-Cu backplate. The bimorph absorbs the …
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Dynamics and Control of Membrane Mirrors for Adaptive Optic Applications
… strip augmented with a single piezoceramic bimorph acting in bending, and a membrane strip augmented with multiple macro-fiber composite bimorphs. The later structure is studied under two actuation configurations. In the first configuration, both actuators act in bending. In the other …
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RESONANCE BASED LOW FREQUENCY SYNTHETIC JET ACTUATOR MODELING, DESIGN, AND TESING
… modeling, design, manufacture, and testing of a bimorph piezo-composite actuator that will provide such displacements at low frequencies. The design employs two opposing benders that provide a piston-type motion. The initial goals of this study were to achieve 30 m/s out of the slot while …
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A comparison of power harvesting techniques and related energy storage issues
… verifying a model for a cantilever piezoelectric bimorph. Next, an investigation into new active fiber composite materials and macro fiber composite devices utilizing the d31 coefficient is performed in comparison to a monolithic piezoelectric bimorph. The information gathered here was used to …
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EXTREME VERTICAL DISPLACEMENT, HIGH FORCE, SILICON MICROSTAGE ZIPPER ACTUATORS
… quality dielectric and the stressed layer of the bimorph. Geometries are explored analytically, numerically and experimentally to provide the greatest electromechanical output while constraining the device footprint to 1mm<super>2</super>. Device performance was benchmarked against previously …
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OPTIMIZATION OF A PIEZOELECTRIC ACOUSTICAL COMPRESSOR
… a stacked layer actuator, and a bending bimorph actuator. The resulting finite element equations are used to determine the optimum shape for the acoustic cavity that results in the highest pressure for the least input power. Optimal chambers were found that could generate ± 19 psi at 1700 …
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Direct and quantitative absorptive spectroscopy of nanowires
… microscope (AFM) cantilever thermometry where a bimorph cantilever is used as a heat flux sensor. These sensors operate on the principle of a thermomechanical bending response and by virtue of their dimensionality, are capable of picowatt sensitivity. To validate the use of this technique, a …
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Experimental Design and Analysis of Piezoelectric Synthetic Jets in Quiescent Air
… composites, were selected for this study, Bimorph, Thunder®, Lipca and RFD. The overall factors considered are the driving signals, voltage, frequency, cavity height, orifice size, and passive cavity pressure. Using the average maximum jet velocity as the response variable, these factors …
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Thermal detection in the long wave infrared and very long wave infrared regions
… the use of metamaterials in conjunction with a bimorph cantilever design for detection in the far wave infrared region. While much work remains to institute these technologies into a deployable product, the early stages of research show potential for use in thermal detection and other …
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Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)
… explicitly solve for the plate deflection of a bimorph and unimorph PMUT with an arbitrary number of circular or ring electrodes. The resulting solution is much simpler and more flexible than previously published solution techniques enabling the optimization of electrode configuration for large …
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Using Macro-Fiber Composite Actuators for Aquatic Locomotion
… composite cantilever beam with MFC actuators in bimorph configuration. The MFC actuators excite the composite beam near its fundamental natural frequency to produce thrust as the vibration transfers momentum to the surrounding fluid. An analytical model that incorporates Euler-Bernoulli beam …
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A Combined Piezoelectric Composite Actuator and Its Application to Wing/Blade Tips
… configuration composite beam with a helicoidal bimorph piezoelectric actuator coiled around it. This novel actuator is a good candidate as a hinge tension-torsion bar actuator for a helicopter rotor blade flap or blade tip and mirror rotational positioning. In the wing tip case, the tip …
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Constitutive modeling of active polymers
… is also used in a study of the behavior of a bimorph strip, noting that the responsive nature of active polymers is often mechanically accentuated by layering with other materials, with implications for future work on transient analysis. Finite element analysis is implemented for verification …
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