Measurement of Resultant Acceleration of a Moving Object in 3-D Space Based on Sensing Position of A Metallic Ball Rolling in a Spherical Shell
| Project/Area Number |
14550413
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
OKADA Tokuji Niigata University, Faculty of Engineering, Professor, 工学部, 教授 (60194362)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Acceleration sensor / Proximity sensor / Elastic distortion / Poisson's ratio / Young's modulus / Distance measurement / Metallic ball weight / Spherical shell / 弾性変位 / 弾性層 / 合成加速度 / ロボットセンサ / 平衡感覚 / 金属球 |
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| Research Abstract |
This research is concerned with a smart acceleration sensor which makes it possible to give equilibrium sense on a object moving in a 3-d space. Actually, we have developed a sensor which can measure resultant acceleration of motion and gravity in 3D space based on sensing a metallic ball position on elastic layer located at inside of a spherical shell. Construction of different types of elastic layers by silicon rubber is introduced and their displacements against pressure are calculated by using the Hertz' law. Since the resultant acceleration makes the ball roll toward the direction to find a balanced position in the shell, the center position of the metallic ball is the target to be pursued. The elastic layer is concentric to the shell and liable to distort so that three proximity sensors of high-frequency oscillation type can detect ball sink against pressure. We show measurement principle of extracting the acceleration by using the characteristics of the sink versus pressure. Experimental results are shown and compared among various rubbers to have the most appropriate design of the sensor. These data are important for making specifications of the spherical acceleration sensor. We got practical data such that angular error less than 7.4[deg] ; amount error less than 0.097[m/s^2] : force sensitivity 0.089[N] ; insensible range less than 6.1[deg] with almost no vibration.
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Report
(4 results)
Research Products
(15 results)
