Topic
Piezoelectric sensor
About: Piezoelectric sensor is a research topic. Over the lifetime, 7127 publications have been published within this topic receiving 115903 citations.
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TL;DR: In this article, the authors presented the manufacturing and testing of active composite panels (ACPs) with embedded piezoelectric sensors and actuators, which were vacuum bagged and co-cured inside an autoclav...
Abstract: This work presents the manufacturing and testing of active composite panels (ACPs) with embedded piezoelectric sensors and actuators. The composite material employed here is a plain weave carbon/epoxy prepreg fabric with 0.30 mm ply thickness. A cross-ply type stacking sequence is employed for the ACPs. The piezoelectric flexible patches employed here are Active Fiber Composite (AFC) piezoceramics with 0.33 mm thickness. Composite layers with openings are used to fill the space around the embedded piezo patches to minimize the problems associated with ply drops in composites. The AFC piezoceramic patches were embedded inside the composite laminate. High-temperature wires were soldered to the piezo leads, insulated from the carbon substructure by high-temperature materials, and were taken out of the composite laminates employing cutout hole, molded-in hole, and embedding techniques. The laminated ACPs with their embedded piezoelectric sensors and actuators were vacuum bagged and co-cured inside an autoclav...
48 citations
Patent•
13 Apr 1992
TL;DR: In this article, a structure of bearing journaling a geared shaft is disclosed in which a piezoelectric sensor is installed in a space between an outer ring of the bearing and its casing for detecting at least one of a force applied to a bearing and generated due to a mesh of gears, its acceleration, velocity, or displacement and outputting a detection signal according to a result of detection of the force.
Abstract: A structure of bearing journaling a geared shaft is disclosed in which a piezoelectric sensor is installed in a space between an outer ring of the bearing and its casing for detecting at least one of a force applied to the bearing and generated due to a mesh of gears, its acceleration, velocity, or displacement and outputting a detection signal according to a result of detection of the force and a piezoelectric actuator installed in the bearing so as to be in series with the piezoelectric element sensor or so as to be axially symmetrical to the opposing piezoelectric element sensor for providing an expansion and constriction movement according to a drive signal, the driving signal being based on the detection signal and having a phase opposite to the phase of the force detected by the piezoelectric element sensor.
48 citations
TL;DR: In this paper, a piston-type micromirror with a stroke of up to 20 µm at 20 V was designed, fabricated and characterized using a silicon-on-insulator wafer with integrated piezoelectric actuators.
Abstract: A novel piston-type micromirror with a stroke of up to 20 µm at 20 V formed out of a silicon-on-insulator wafer with integrated piezoelectric actuators was designed, fabricated and characterized. The peak-to-valley planarity of a 2 mm diameter mirror was better than 15 nm, and tip-to-tip tilt upon actuation less than 30 nm. A resonance frequency of 9.8 kHz was measured. Analytical and finite element models were developed and compared to measurements. The design is based on a silicon-on-insulator wafer where the circular mirror is formed out of the handle silicon, thus forming a thick, highly rigid and ultra-planar mirror surface. The mirror plate is connected to a supporting frame through a membrane formed out of the device silicon layer. A piezoelectric actuator made of lead–zirconate–titanate (PZT) thin film is structured on top of the membrane, providing mirror deflection by deformation of the membrane. Two actuator designs were tested: one with a single ring and the other with a double ring providing bidirectional movement of the mirror. The fabricated mirrors were characterized by white light interferometry to determine the static and temporal response as well as mirror planarity.
48 citations
TL;DR: The nanofibrous mat processed to successfully develop a textile, which acquired effective conductivity while maintaining a soft and porous nature for comfortable wearing, exhibits high stability, good bending stability with 10000 bending cyclic as well as superior wearability of washing and breathability.
Abstract: Piezoelectric materials have been widely explored, due to their potential applications related to wearable sensors, energy harvesting, and electronics. However, the majority of previously reported ...
48 citations
TL;DR: In this paper, a finite element model is developed for the active control of thermally induced vibration of laminated composite plates with piezoelectric sensors and actuators, taking into account the mass, stiffness and thermal expansion of the PAs.
Abstract: A finite-element model is developed for the active control of thermally induced vibration of laminated composite plates with piezoelectric sensors and actuators. The present model takes into account the mass, stiffness and thermal expansion of the piezoelectric patches. A C0 continuous nine-noded shear flexible element is implemented to model the plate. The piezoelectric sensing layer monitors the structural oscillation due to the direct piezoelectric effect and the actuator suppresses the oscillation via the converse piezoelectric effect. These two effects are then coupled with a constant gain feedback control algorithm to actively control the dynamic response of the plate in a closed loop. Numerical results indicate that thermally induced deformation of a laminated plate can be suppressed through the application of electrical potential to the piezoelectric patches.
48 citations