Monolithic Piezoelectric Sensor for Measurement of Triaxial Forces Applied to Bridge by String Vibration
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概要
- 論文の詳細を見る
We propose a piezoelectric sensor to investigate string vibration. This sensor has a square pyramidal structure and five electrodes on each surface, and enables us to measure triaxial forces. Measuring triaxial forces from a single sensor enables us to obtain complex vibration mechanisms, such as the string vibration of musical instruments. We designed the sensor to serve as a bridge of musical instruments and to measure triaxial forces applied by string vibration directly. A previously proposed sensor, which also serves as the bridge, has a problem regarding its charge sensitivity. To improve charge sensitivity, the newly proposed sensor is designed to have large electrodes by devising its structure. The sensitivity of the newly proposed sensor is compared with that of the previously proposed sensor using a finite element method. The sensitivity of the proposed sensor becomes higher than that of the previous sensor. In particular, the sensitivity of the proposed sensor in the horizontal direction becomes about 2.5 times higher than that of the previous one. The reason for this is that the new sensor is applied with a piezoelectric shear effect to measure its sensitivity in the horizontal direction, while the previous one is applied with a longitudinal effect. The constant of the piezoelectric shear effect is generally about two times higher than that of the longitudinal effect. Moreover, we obtain the sensitivity of the proposed sensor in the experiment. The experimental results suggest that the triaxial force can be measured by calculating the pseudo-inverse matrix of the measured sensitivity.
- 2011-07-25
著者
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Mizutani Koichi
Graduate School Of Systems And Information Engineering Univ. Of Tsukuba
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Wakatsuki Naoto
Graduate School Of Systems And Information Engineering University Of Tsukuba
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Takarada Jun
Graduate School of Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan
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Wakatsuki Naoto
Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8753, Japan
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Mizutani Koichi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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