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Bimorph

About: Bimorph is a research topic. Over the lifetime, 3339 publications have been published within this topic receiving 51880 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a general analytical solution for the transient analysis of a magneto-electro-elastic bimorph beam is obtained based on the Timoshenko beam theory and on the assumption that the electric and magnetic fields can be treated as steady.
Abstract: Based on the Timoshenko beam theory and on the assumption that the electric and magnetic fields can be treated as steady, since elastic waves propagate very slowly with respect to electromagnetic ones, a general analytical solution for the transient analysis of a magneto-electro-elastic bimorph beam is obtained. General magneto-electric boundary conditions can be applied on the top and bottom surfaces of the beam, allowing us to study the response of the bilayer structure to electromagnetic stimuli. The model reveals that the magneto-electric loads enter the solution as an equivalent external bending moment per unit length and as time-dependent mechanical boundary conditions through the definition of the bending moment. Moreover, the influences of the electro-mechanic, magneto-mechanic and electromagnetic coupling on the stiffness of the bimorph stem from the computation of the beam equivalent stiffness constants. Free and forced vibration analyses of both multiphase and laminated magneto-electro-elastic composite beams are carried out to check the effectiveness and reliability of the proposed analytic solution.

52 citations

Journal ArticleDOI
TL;DR: Results of this study show that, the fault diagnosis can be performed autonomously by applying the pulse-based method presented in this work, and by using the piezoelectric harvesting device as an energy source.
Abstract: This paper presents a novel autonomous method for condition monitoring of rotating machines during operation based on radio frequency (RF) pulse transmission using energy harvesting from operational vibration. An energy harvesting unit is designed to generate and rectify the energy harvested from the machine vibration using Voltage Multiplier (VM) circuit and to store the energy into a capacitor. Then, this energy harvesting unit runs a smart system consisting of a microcontroller and the RF transmitter designed to send a pulse at specific capacitor voltage. A pulse-based condition monitoring approach is introduced which monitors the state of the machine during the operation. In order to estimate power output of the piezoelectric harvester for a realistic vibration signal, the Fourier Transform concept for signal decomposition is incorporated into the well-known electromechanical distributed parameter model. Using experimental data, performance of this autonomous condition monitoring system is tested for a water pump at different conditions. To do so, acceleration data from a centrifugal water pump are acquired with an accelerometer, which then decomposed into a series of harmonics using Fast Fourier Transform. Then using analytical distribute model, a bimorph energy harvester with two Piezoceramic layers is optimized to generate maximum power from the water pump vibration. Consequently, the condition monitoring of the water pump is performed using the presented pulse-based approach. Results of this study show that, the fault diagnosis can be performed autonomously by applying the pulse-based method presented in this work, and by using the piezoelectric harvesting device as an energy source.

52 citations

Patent
Richard H. Laughlin1
17 Nov 1997
TL;DR: In this paper, a bimorph transducer is coupled to a switchplate and two ends of the transducers are coupled to the refractor and the switchplate is coupled between the two ends.
Abstract: A device for processing an optical signal includes a refractor with a reflecting surface for reflecting the optical signal by frustrated total internal reflection. In one embodiment, the device includes a bimorph transducer coupled on one end to the refractor and on the opposing end to a switchplate. In another embodiment, two ends of the bimorph transducer are coupled to the refractor and the switchplate is coupled between the two ends.

51 citations

Patent
Michael J. Sinclair1
30 Jan 2003
TL;DR: In this article, an electrostatic bimorph actuator is described for a microelectrical mechanical optical display system, where the actuator includes a substrate electrode that is secured to and insulated from the substrate and positioned under and in alignment with the bimomorph arm.
Abstract: An electrostatic bimorph actuator includes a cantilevered flexible bimorph arm that is secured and insulated at one end to a planar substrate. In an electrostatically activated state the bimorph arm is generally parallel to the planar substrate. In a relaxed state, residual stress in the bimorph arm causes its free end to extend out-of-plane from the planar substrate. The actuator includes a substrate electrode that is secured to and insulated from the substrate and positioned under and in alignment with the bimorph arm. An electrical potential difference applied between the bimorph arm and the substrate electrode imparts electrostatic attraction between the bimorph arm and the substrate electrode to activate the actuator. As an exemplary application in which such actuators could be used, a microelectrical mechanical optical display system is described.

51 citations

Journal ArticleDOI
TL;DR: In this article, a three-dimensional analysis of parallel piezoelectric bimorphs is presented, based on the state space formulation combined with an asymptotic expansion technique.

51 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022116
202191
202090
2019123
2018117