Reviews, Commentaries, etc. - Takahashi, Hidetoshi

J0205-1-1 Measurement of differential pressure on a butterfly wing

TAKAHASHI Hidetoshi, MATSUMOTO Kiyoshi, SHIMOYAMA Isao

年次大会講演論文集 : JSME annual meeting (一般社団法人日本機械学会)  2010 ( 6 ) 27 - 28 2010.09

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This paper reports on direct measurement of differential pressure on a butterfly wing during free flight. Differential pressure was measured using a micro-fabricated sensor. A piezo-resistive cantilever was used as a differential pressure sensor. The sensor was 1.0 mm × 1.0 mm × 0.3 mm in size and 0.7 mg in weight so that it did not interfere with wing motion. By attaching the sensor to the center of a butterfly forewing with a flexible wiring, the differential pressure on the wing was measured during free flight. We revealed that the maximum pressure value was 11.7 Pa at the end of stroke. The maximum aerodynamic force in free-flight is 10 times as large as the gravity acting on the body.

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MEMS差圧センサを搭載した羽ばたき機を用いた昆虫飛翔の研究

高橋英俊, 大澤一治, 青山雄一郎, 松本潔, 下山勲

飛行機シンポジウム講演集(CD-ROM) 48th   ROMBUNNO.2C6 2010

Bush-Cricket-Inspired Acoustic Sensor for Sound Localization with One Sensor

稲葉亮, NGUYEN Minh Dung, 高橋英俊, 岩瀬英治, 松本潔, 下山勲

日本ロボット学会学術講演会予稿集(CD-ROM) 27th   ROMBUNNO.2I1-03 2009.09

Measurement of differential pressure on wing surface using an ornithopter modeled on insects

青山雄一郎, 大澤一治, 高橋英俊, 岩瀬英治, 松本潔, 下山勲

日本ロボット学会学術講演会予稿集(CD-ROM) 27th   ROMBUNNO.1M3-07 2009.09

J0202-1-6 Air pressure difference on artificial insect wing with MEMS sensor

TAKAHASHI Hidetoshi, MATSUMOTO Kiyoshi, SHIMOYAMA Isao

年次大会講演論文集 : JSME annual meeting (一般社団法人日本機械学会)  2009 ( 6 ) 135 - 136 2009.09

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An insect generates differential pressure between the upper and lower surface of its wings by flapping motion. The insect flies by utilizing that pressure difference as aerodynamic force. In the present study, a high-sensitive sensor utilizing MEMS technology was fabricated to measure the differential pressure. A piezoresistance cantilever was used as the differential pressure sensor. The size of the sensor was 1.5 × 1.5 × 0.3 mm^3, which was small enough not to interfere with the wings under flapping state. The measurement range and resolution were 100 Pa and 0.1 Pa, respectively. By fixing the sensors to an artificial insect wing surface, we demonstrated that the differential pressure distribution was enabled to measure.

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Study on the micro region MRI with a Micro Coil

DOHI Tetsuji, TAKAHASHI Hidetoshi, KUWANA Kenta, SHIMOYAMA Isao

電気学会研究会資料. BMS, バイオ・マイクロシステム研究会 = The papers of Technical Meeting on Bio Micro Systems, IEE Japan 2008 ( 16 ) 19 - 22 2008.09

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1P1-H08 A Micro Ultrasonic Wave Sensor Using Helmholtz Resonance

SUZUKI Akira, TAKAHASHI Hidetoshi, IWASE Eiji, MATSUMOTO Kiyoshi, SHIMOYAMA Isao

ロボティクス・メカトロニクス講演会講演概要集 (一般社団法人日本機械学会)  2008   "1P1 - H08(1)"-"1P1-H08(4)" 2008.06

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We propose a method to improve the sensitivity of a micro ultrasonic wave sensor using Helmholtz resonance. By this method, we improve the sensitivity by 23.8 [dB], getting 15.5 times greater amplitude of the vibration of the cantilever, which was used as the sensor, compared with the normal cantilever. We also made two more experiments to measure how the sensitivity changed according to the relationship between the resonance frequency of the Helmholtz cabity and the natural frequency of the cantilever. As a result, the sensitivity was the highest when these two frequencies were the same. The peak of resonance was not so sharp that the sensitivity was more than the half of its maximum when the resonance frequency of the Helmholtz cabity was in the range of 92.6 - 108.9% of the natural frequency of the cantilever. Moreover, there was also a peak at the resonance frequency on the frequency properly of the sensor, even if there was a small gap between the two frequencies.

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1505 Local High Resolution MRI with a Micro Planar Coil

DOHI Tetsuji, TAKAHASHI Hidetoshi, KUWANA Kenta, MATSUMOTO Kiyoshi, SHIMOYAMA Isao

Conference on Information, Intelligence and Precision Equipment : IIP (一般社団法人日本機械学会)  2008   166 - 168 2008.03

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This paper reports on a micro planar coil as a receiver for a high resolution MRI (Magnetic Resonance Imaging). In this study, a micro planar coil of 10 mm in diameter was fabricated. The MRI signal receiving device was made by attaching the micro coils to the tip of acrylic pipes. The signal to noise ratio of MR image taken by the micro planar coil was 8 times as high as MR image taken by medical MRI coil. MR images of okra (Abelmoschus esculentus) were acquired with 2.0×2.0×2.0 mm^3 and 0.5×0.5×1.0 mm^3 resolutions.

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2P2-C04 The effect of phase relationships between wings of dragonfly-type flight

TAKAHASHI Hidetoshi, TANAKA Hiroto, HOSHINO Kazunori, MATSUMOTO Kiyoshi, SHIMOYAMA Isao

ロボティクス・メカトロニクス講演会講演概要集 (一般社団法人日本機械学会)  2006   "2P2 - C04(1)"-"2P2-C04(2)" 2006

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We reported on the effect of the phase relationship between forewings and hindwings in the dragonfly flight. The dragonfly-type ornithopters (DTOs) were developed to investigate the flapping flight. The wing span of DTO is 100 mm long. Reynolds number is the same order as Dragonfly's Reynolds number (10^3). Flights of DTOs with various phase relationships were recorded with a high speed video camera, and their motions were analyzed. We also visualized air flow around the wings in a wind tunnel. We demonstrated that there are phase relationships for accelerating flight (45°), low speed flight (180°), high speed flight (270°,315°). This relationship between flight and phase almost matched that of dragonflies.

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Study of Insect Flight by Measuring Flights of Small Ornithopters

田中博人, 高橋英俊, 松本潔, 下山勲

飛行機シンポジウム講演集(CD-ROM) 44th   2A2 2006