| Project/Area Number |
14350135
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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 |
Intelligent mechanics/Mechanical systems
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| Research Institution | Shizuoka Institute of Science and Technology |
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Principal Investigator |
MASUDA Tadashi Shizuoka Institute of Science and Technology, Department of Mechanical Engineering, Professor, 理工学部, 教授 (10106891)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2003: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥11,300,000 (Direct Cost: ¥11,300,000)
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| Keywords | angle measurement / calibration / self-checking method / rotary encoder |
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| Research Abstract |
1.Development of the calibration system.
This system consists of the precise constant speed rotating mechanism mounted two standard rotary encoders A and B, the index mechanism, the error measurement circuit and the computer. Both encoders are the optical type with 36000 pulses per revolution and come to be installed with 10 detecting heads. The rotary mechanism consists of the precise rotary air bearing and the d.c.motor and it can rotate with 20rpm from 1rpm. The index mechanism consists of the rotary air bearing, the a.c.motor and the rotary encoder for indexing. The mechanism can index the detecting heads unit of the rotary encoder A at any angle position. After indexing, the mechanical disc brake system fixes the detecting head unit perfectly. The error measurement circuit can get the relative angle position errors of forty rotary encoders at the same time and does the measurement of the time conversion method with high resolution. The computer controls the indexing and the measuring and performs the computation of Masuda method.
2.Experiment and Results
The standard deviation of the relative angle position error of the single detection head was 0.008 seconds. The standard deviations of the relative angle position error of the rotary encoder B and A were 0.01 and 0.02 arc seconds, respectively. The standard deviations of the relative angle position error of both rotary encoders with 5 heads were 0.003 arc seconds. By Masuda calibration method, it was confirmed that the angle position errors of both encoders were +/- 0.2 arc seconds and the uncertainty of the calibration values were 0.03 arc seconds. It found that the repeatability of its values were very high with 0.003 arc seconds. The cause that the uncertainty didn't reach the 0.005 seconds of the goal is insufficiency of the indexed accuracy.
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