| Project/Area Number |
16360111
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
QIU Jinhao Tohoku University, Institute of Fluid Science, Professor, 流体科学研究所, 教授 (60241585)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAGI Toshiyuki Tohoku University, Institute of Fluid Science, Professor, 流体科学研究所, 教授 (20197065)
UCHIMOTO Tetsuya Tohoku University, Institute of Fluid Science, Associate Professor, 流体科学研究所, 助教授 (70313038)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2005: ¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2004: ¥8,400,000 (Direct Cost: ¥8,400,000)
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| Keywords | Piezoelectric fiber / Sensor / Actuator / Micro sensor / Flow sensor |
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| Research Abstract |
The process to coat different electrodes on cored piezoelectric fibers, the methods to measure the mechanical, electric and piezoelectric properties of cored fibers, and the process to manufacture curved fibers were developed and the applications of cored piezoelectric fibers to bio-mimetic flow sensors and the sensors for structural health monitoring were studied. The main academic achievements are as follows.
The cored piezoelectric fibers can be used in the longitudinal mode when the electrode is coated on the whole surface or the bending mode when the electrode is coated on half of the surface. In this study, a fixture was designed for the exiting sputtering machine to coat both whole-surface electrode and half-surface electrode. The dynamic model of the straight piezoelectric fibers was established and solved and formulas to estimate the piezoelectric characteristics were established based on the resonance and anti-resonance method. To meet the various applications, a process to fa
… More
bricate curved piezoelectric fibers was established, and ring-shaped, arc-shaped, spiral fibers were fabricated. In the fabrication process, a fixture was used to generate the desired shape during the sintering process. Furthermore, the conditions including the atmospheric gas, sintering temperature, and used additions were optimized to fabricate high-performance fibers.
As an application of the fibers, bio-mimetic flow sensors were produced from piezoelectric fibers coated with a half-surface electrode and the relationship between the output voltage of the sensor and flow velocity was investigated. The fiber was installed vertically inside a small wind tunnel with a shutter to change the flow and the output voltage signal of the sensor was measured when the shutter was closed or opened. The relationship between the maximum output voltage and the maximum acceleration of flow when the shutter is opened and closed was obtained. A fiber coated with a whole-surface electrode was used as a sensor for structural health monitoring. A GFRP plate with four embedded sensors was manufactured in an autoclave. An impact load was applied to the plate and the output voltages of the four sensors were measured and recorded. The position of the impact load was identified from the voltage signals of the sensors using a neural network. The maximum identification error of impact position is less than 5%. Less
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