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Piezoelectric Shells: Distributed Sensing and Control of Continua
01 Jan 1993-
TL;DR: In this paper, a linear piezoelectricity theory is proposed for the control of cylindrical shells with finite element sensors and actuators, based on a finite element formulation and analysis.
Abstract: Piezoelectric shell vibration theory common piezoelectric continua and active piezoelectric structures distributed sensing and control of elastic shells multi-layered shell actuators boundary control of beams distributed control of plates with segmented sensors and actuators convolving shell sensors and actuators applied to rings sensing and control of cylindrical shells finite element formulation and analyses. Appendix: linear piezoelectricity theory.
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TL;DR: In this paper, a vibration-based piezoelectric generator has been developed as an enabling technology for wireless sensor networks, where the authors discuss the modeling, design, and optimization of the generator based on a two-layer bending element.
Abstract: Enabling technologies for wireless sensor networks have gained considerable attention in research communities over the past few years. It is highly desirable, even necessary in certain situations, for wireless sensor nodes to be self-powered. With this goal in mind, a vibration based piezoelectric generator has been developed as an enabling technology for wireless sensor networks. The focus of this paper is to discuss the modeling, design, and optimization of a piezoelectric generator based on a two-layer bending element. An analytical model of the generator has been developed and validated. In addition to providing intuitive design insight, the model has been used as the basis for design optimization. Designs of 1 cm3 in size generated using the model have demonstrated a power output of 375 µW from a vibration source of 2.5 m s−2 at 120 Hz. Furthermore, a 1 cm3 generator has been used to power a custom designed 1.9 GHz radio transmitter from the same vibration source.
1,782 citations
Cites methods from "Piezoelectric Shells: Distributed S..."
...Note that the nomenclature conventions of Tzou [18] are implemented here....
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800 citations
01 Jan 2003
TL;DR: In this paper, a broad survey of potential energy scavenging methods, the conversion of ambient vibrations to electricity was chosen as a method for further research and converters based on both piezoelectric and electrostatic coupling were pursued.
Abstract: Energy Scavenging for Wireless Sensor Nodes with a Focus on Vibration to Electricity Conversion by Shadrach Joseph Roundy Doctor of Philosophy in Mechanical Engineering University of California, Berkeley Professor Paul K. Wright, Chair The vast reduction in size and power consumption of CMOS circuitry has led to a large research effort based around the vision of ubiquitous networks of wireless communication nodes. As the networks, which are usually designed to run on batteries, increase in number and the devices decrease in size, the replacement of depleted batteries is not practical. Methods of scavenging ambient power for use by low power wireless electronic devices have been explored in an effort to make the wireless nodes and resulting wireless sensor networks indefinitely self-contained. After a broad survey of potential energy scavenging methods, the conversion of ambient vibrations to electricity was chosen as a method for further research. Converters based on both piezoelectric and electrostatic (capacitive) coupling were pursued. Both types of converters were carefully modeled. Designs were optimized based on the models developed within in total size constraint of 1 cm. Test results from the piezoelectric converters demonstrate power densities of about 200 μW/cm from input vibrations of 2.25 m/s at 120 Hz. Furthermore, test results matched simulated outputs very closely thus verifying the validity of the model as a basis for design. One of
537 citations
Cites methods from "Piezoelectric Shells: Distributed S..."
...Perhaps the most common is the convention used by Tzou (Tzou 1993) in which T is used as the stress variable defined as stress induced by mechanical strain and piezoelectric affects....
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TL;DR: In this paper, a finite element model of laminated structures with distributed piezoelectric sensor and actuator layers and control electronics is considered, where the effects of temperature on the electrical and mechanical properties and the coupling between them are also taken into consideration in the finite element formulation.
222 citations
TL;DR: In this paper, a numerical study concerning the active vibration control of smart piezoelectric beams is performed in order to investigate their effectiveness to suppress vibrations in beams with PAs acting as sensors or actuators.
218 citations