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 20 of 55 for “"Piezoelectric Actuator"”.
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Modeling and Validation of S-Drive: A Nestable Piezoelectric Actuator
This dissertation introduces a novel, nestable piezoelectric actuator, called the s-drive. In the s-drive actuator, the piezoelectric material is sandwiched between two conductors, and the electrodes are configured such that an application of a voltage causes an extension on two beams and …
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Design of an improved piezoelectric actuator for helicopter rotor control
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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Optimization of piezoelectric actuator systems for vibration control of flexible structures
Actuator placement is a major concern in control system designs. Utilizing piezoelectric actuators increases the complexity of actuator designs, because both actuator location and dimensions need to be considered. A comprehensive study was conducted in this dissertation on the optimization of …
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Use of a piezoelectric actuator to study the mechanical oscillatory behavior of living cells
… in cultured capillary endothelial cells using a piezoelectric actuator. The actuator was used to displace fibronectin-coated coverslip on which the cells were cultured the associated displacement of sub-cellular regions was examined using surface-bound microbeads in conjunction with real-time …
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Coupled electro-mechanical system modeling and experimental investigation of piezoelectric actuator-driven adaptive structures
… modeling approaches have been applied to model piezoelectric (PZT) actuator-driven adaptive structures. The dynamic interaction between the actuators and their host structures has been ignored, and the system energy conversion can’t be predicted. As a matter of fact, PZT actuator-driven smart …
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Experimental/analytical determination of optimal piezoelectric actuator locations on complex structures based on the actuator power factor
The actuator power factor is defined as the ratio of the total dissipative mechanical power of a PZT actuator to the total supplied electrical power to the PZT actuator. If measured experimentally, it can be used to optimize the actuator location and configuration for complex structures. The …
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Dynamic response of simply supported beams excited by piezoelectric actuators
The use of piezoelectric devices for the purposes of active noise or vibration control has become attractive in recent times. These small, power to weight efficient devices have had some success in active vibration control; however, the force transfer mechanism by which they interact with the …
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Developement of Piezo-Hydraulic Actuation Systems Technology for use on a Helicopter Trailing Edge Flap
… of this study was to create a proof-of-concept piezoelectric actuator system capable of meeting the performance requirements necessary for actuation of a trailing edge flap for a helicopter main rotor blade. Due to extremely small displacements produced by piezoelectric actuators, their output …
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OPTIMIZATION OF A PIEZOELECTRIC ACOUSTICAL COMPRESSOR
… model describing a fluid interacting with a piezoelectric actuator is developed. This system is used to generate finite amplitude standing waves in an acoustic cavity with rigid walls. The model includes the effects of viscous and thermal damping of the fluid at the boundary of the cavity, …
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A Study of Smart Foam for Noise Control Applications
… control treatment that consists of a distributed piezoelectric actuator, known as polyvinylidene fluoride (PVDF), embedded within a layer of partially-reticulated polyurethane foam. The principal function of smart foam is to yield broadband sound attenuation. Passive acoustic foams are a very …
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Active control of interior noise using piezoelectric actuators in a large-scale composite fuselage model
… studied. The control inputs are due to piezoelectric actuators bonded to the cylinder wall while error information from the interior acoustic field is sensed by microphones. A preliminary analytical development was conducted to investigate the mechanisms of the structural/acoustic …
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Durability of Polymer /Metal Interfaces Under Cyclic Loading
The mixed-mode was applied by a piezoelectric actuator. Subcritical crack growth was observed along the epoxy/aluminum interface and the growth rate was found to depend on the magnitude of the applied electric field. Kinetics of the crack growth was correlated with the piezoelectric driving force. …
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Control Design for an Inertially Stabilized Rifle
… the barrel movement. The INSTAR system uses an piezoelectric actuator separating the barrel of the rifle from its stock to stabilize barrel movement. This paper uses various control techniques to develop control algorithms for simulation. The level of performance for each control algorithm is …
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Robust Repetitive Control and Its Application
… are successfully applied to an electrohydraulic actuator for non-circular machining of camshaft to show their effectiveness. A dual stage actuator using an electrohydraulic actuator and a piezoelectric actuator is developed to further reduce cam profile tracking errors. The design, modeling, …
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A piezo-tunable gigahertz cavity microelectromechanical resonator
… close the capacitor gap. Testing was done with a piezoelectric actuator for this task. The match between the modeled and measured impedance is extremely good up to and beyond 5 GHz, with less than a 1% error in magnitude and phase.
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Forward viewing OCT endomicroscopy
… optical fiber that was mounted proximally on a piezoelectric tubular actuator, which was electrically driven in two perpendicular dimensions to produce a spiral scan pattern. The probe has a 3.3 mm outer diameter and is intended for endoscopic imaging. Multiple optical systems were designed to …
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Design, Simulation, and Wind Tunnel Verication of a Morphing Airfoil
… is wing morphing achieved through the use of piezoelectric Macro Fiber Composites (MFCs). These devices exhibit low power draw but excellent bandwidth characteristics. This thesis provides a background in the 2D analytical and computer modeling tools and methods needed to design and …
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Static, dynamic and levitation characteristics of squeeze film air journal bearing: Designing, modelling, simulation and fluid solid interaction
… of the bearings at their modes, a single layer piezoelectric actuator was used as a driver. The maximum stroke length and the maximum blocking force of the single layer piezoelectric actuator were determined using manual calculation and ANSYS simulation. In the coupled-field analysis, the single …
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Understanding frequency response of a flexural complaint stage for use in oscillatory orthogonal cutting
… response of a complaint flexural stage driven by piezoelectric actuator was measured. Using a Linear Variable Differential Transformer (LVDT) and a dynamic signal analyzer via LabView, the frequency response of the stage was measured from 100Hz to 10000Hz. A model was then fitted to the measured …
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