Topic
Bimorph
About: Bimorph is a research topic. Over the lifetime, 3339 publications have been published within this topic receiving 51880 citations.
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25 Mar 2006
TL;DR: A tactile transducer system that has a compact, yet modular design, appeals to ordinary fabrication methods, and can be assembled and dismantled in a short time for debugging and maintenance is described.
Abstract: We describe a tactile transducer system that has a compact, yet modular design. The tactile transducer comprises a 6 × 10 piezo bimorph actuator array with a spatial resolution of 1.8 × 1.2 millimeter and a wide temporal bandwidth. The blocked force of the individual actuators can be changed (0.15 N, 0.22 N) by adjusting the cantilever mechanics to optimally match skins and/or applications. This tactile transducer is modular, appeals to ordinary fabrication methods, and can be assembled and dismantled in a short time for debugging and maintenance. It weighs 60 g, it is self-contained in a 150 cm3volume and may be interfaced to most computer, provided that two analog outputs and six digital IO lines are available. A pilot test was carried out where subjects were asked to detect a virtual line randomly located on an otherwise smooth virtual surface.
92 citations
TL;DR: In this article, a simple response function histeresis compensation method is suggested to correct the first eight Zernike polynomials with a 17-electrode bimorph mirror.
Abstract: A semipassive bimorph mirror is considered as the most promising corrector for low-order and at the same time low-cost atmo- spheric adaptive optical systems. Theoretical and experimental results of the response functions study are presented. A simple response function histeresis compensation method is suggested. The efficiency of correct- ing the first eight Zernike polynomials with a 17-electrode bimorph mirror is given. It is shown that such a corrector can be successfully used to compensate turbulence with the Kolmogorov spectrum. © 1996 Society of Photo-Optical Instrumentation Engineers.
91 citations
Patent•
18 Sep 1992
TL;DR: In this article, the flexural rigidity of a bimorph piezoelectric actuator is set higher in the longitudinal direction than in the lateral direction, which can be used to constitute a stabilized closed loop position control system.
Abstract: PURPOSE:To constitute a stabilized closed loop position control system in which flexural rigidity of piezoelectric actuator is set higher in the longitudinal direction than in the lateral direction. CONSTITUTION:Lateral slits are made in the intermediate electrode 2 of a bimorph piezoelectric actuator having flexural rigity higher in the longitudinal direction than in the lateral direction. Piezoelectric ceramics 1a, 1b are bonded to the intermediate electrode 2 and when a voltage is applied thereon, voltages are induced between the intermediate electrode 2 and the surface electrodes provided on the opposite surfaces of the actuator thus producing electric fields. The piezoelectric ceramic 1a, 1b elongates or contracts depending on the fact that the direction of the electric field matches with the polarizing direction of the piezoelectric ceramic or not. Vibration characteristics of piezoelectric actuator include single node primary resonance mode in longitudinal direction and double node secondary resonance mode in lateral direction. This constitution realizes a stabilized control system.
91 citations
05 Jun 2011
TL;DR: In this article, a MEMS-based PZT/PZT thick film bimorph vibration energy harvester with an integrated silicon proof mass is presented, which replaces the support with another layer of the piezoelectric material, and with the absence of an inactive mechanical support all of the stresses induced by the vibrations will be harvested by the active PZE elements.
Abstract: We present a MEMS-based PZT/PZT thick film bimorph vibration energy harvester with an integrated silicon proof mass. The most common piezoelectric energy harvesting devices utilize a cantilever beam of a non piezoelectric material as support beneath or in-between the piezoelectric material. It provides mechanical support but it also reduces the power output. Our device replaces the support with another layer of the piezoelectric material, and with the absence of an inactive mechanical support all of the stresses induced by the vibrations will be harvested by the active piezoelectric elements.
90 citations
TL;DR: In this paper, a self-powered smart sensor node (also called "smart tag") consisting of a piezoelectric vibration energy harvester, a power conditioning circuit, sensors and an RF transmitter was reported.
Abstract: This paper reports a self powered smart sensor node (also called ‘smart tag’) consisting of a piezoelectric vibration energy harvester, a power conditioning circuit, sensors and an RF transmitter. The smart tag has dimensions similar to a credit card and can be easily integrated into various applications such as the surface of the aircraft. The smart tag is powered by an integrated bimorph piezoelectric generator that extracts energy from ambient vibrations. The generator is fabricated using thick film printing technology. Experimentally, the generator produced a maximum RMS output power of 240W when excited at vibration with a frequency of 67 Hz and peak amplitude of 0.4 g (3.9 m s −2 ). This generated power is sufficient to enable periodic sensing and transmission. Details of the experimental results of the piezoelectric generator and the power conditioning circuit are presented. Test shows that the waiting time of the system between two consecutive transmissions is around 800 s. © 2011 Elsevier B.V. All rights reserved.
90 citations