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Affiliation |
Graduate School of Engineering Science Department of Systems Design Engineering Mechanical Engineering Course |
OKUYAMA Eiki
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Graduating School 【 display / non-display 】
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-1983.03
Tohoku University Graduated
Graduate School 【 display / non-display 】
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-1985.03
Tohoku University Graduate School,Division of Engineering Master's Degree Program Completed
Campus Career 【 display / non-display 】
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2016.04-Now
Akita University Graduate School of Engineering Science Department of Systems Design Engineering Mechanical Engineering Course Professor
Research Achievements 【 display / non-display 】
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Angle detection using gyro signals rotating around four orthogonally aligned axes
International Journal of Automation Technology ( International Journal of Automation Technology ) 14 ( 1 ) 52 - 58 2020.01 [Refereed]
Research paper (journal)
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Surface Profile Measurement Based on the Concept of Multi-Step Division of Length
Eiki Okuyama†, Kohei Konda, and Hiromi Ishikawa
International Journal of Automation Technology 11 716 2017.09 [Refereed]
Research paper (journal) Domestic Co-author
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Combination of double scale measurements for large scale surface profile measurement
Eiki OKUYAMA, Masayuki ITO
Measurement Technology and Intelligent Instruments XII 2017.09 [Refereed]
Research paper (journal) Domestic Co-author
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Development of a Surface Roughness Measurement System in a Narrow Borehole
Eiki OKUYAMA, Yuichi SUZUKI, Masahiro MORIKAWA, Yuma SUZUKI and Ichiro YOSHIDA
International Journal of Automation Technology 10 ( 5 ) 821 - 826 2016.09 [Refereed]
Research paper (journal) Domestic Co-author
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Roundness Profile Measurement Using a Combination Method of Three-Point Method for Roundness Profile Measurement and Integration Method for Straightness Profile Measurement
Okuyama Eiki, Fukuda Takato
International Journal of Automation Technology ( 富士技術出版株式会社 ) 18 ( 1 ) 77 - 83 2024.01
<p>A three-point method has been used to separate the roundness profile of a workpiece and radial motions of a turntable. First, weighted addition is used to extract the roundness profile, and then, inverse filtering is used to recover the original roundness profile. The three-point method works well in the low spatial frequency domain. However, in the high spatial frequency domain, the setting angle error of the sensor causes a large deflection of the transfer function. Therefore, a combination method of the three-point method for roundness profile measurement and an integration method for the straightness profile measurement is proposed. The three-point method for roundness profile measurement is used to estimate low spatial frequency domain and the integration method for straightness profile measurement is used to estimate the high spatial frequency domain. Experimental results showed that the standard deviation of the combination method was smaller than that of the three-point method for most positions.</p>
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Study on Combination Method for Straightness Profile Measurement
OKUYAMA Eiki, KIYONO Satoshi
Journal of the Japan Society for Precision Engineering ( The Japan Society for Precision Engineering ) 85 ( 4 ) 347 - 351 2019.04
<p>Software datums that separate a surface profile from straightness error motion of a scanning sensor are well-known for the straightness profile measurement. Though sequential two point method is often used, it's not useful for many sampling points. When number of sampling point is increased, influence of error propagation of sequential two-point method is increased. In this paper, some combination methods, based on the average criteria, the generalized two-point method criteria and the least squares criteria, are discussed, assuming that a measured profile is a non-periodic function. Simulation results show that the combination method based on the least squares criteria is suitable as the combination of the some large sensor interval sequential methods.</p>
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Development a compact sensor of surface roughness measurement
OKUYAMA Eiki, BANDO Nobuhiko, HAMANO Yasuo
The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) 2019
<p>In various industrial fields, it is frequently necessary to measure surface roughness in confined spaces such as boreholes and grooves. We already proposed a novel surface roughness measurement sensor for small boreholes. To make the surface roughness sensor small, we used a stylus with a cylindrical mirror and a lensed fiber instead of a conventional inductive pick-up. However, experimental results showed that this system had only 8 μm measurement range. To expand the measurement range, we proposed a new stylus. Experimental results showed 62μm measurement range. In this article, we propose null method.</p>
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Profile measurement using a gyro (10th report):Effect of the phase mismatch for the gyro rotation
Kume Tatsuya, Satoh Masanori, Suwada Tsuyoshi, Furukawa Kazuro, Okuyama Eiki
Proceedings of JSPE Semestrial Meeting ( The Japan Society for Precision Engineering ) 2018 ( 0 ) 145 - 146 2018
<p>Profile shape evaluation by detecting tangential angles of the profile is competent for large objects, because it is not affected by shape references, which are difficult to be defined enough accurately for allover the object. We consider adopting a gyro for detecting the angles. Gyros derive angles from the detected angular velocities and are not restricted in their measurement directions or distances, because they do not need any angular references. However, they are suffered from instabilities in their measurements. We rotate a gyro around an axis perpendicular to its sensitive axis, and derive angles of the gyro rotating axis against the earth rotating axis, those are the latitudes and the azimuths, without being affected by the instabilities; however, the derived latitudes seem to be proportional to the gyro rotating rate. Here, we focus on the phase mismatch between the forward and the inverse rotations. The simulation results agree well with the experimental results except for the faster rotating rate of 1 rps.</p>
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Profile measurement using a gyro (8th report):Angle derivation without approximation
Kume Tatsuya, Satoh Masanori, Suwada Tsuyoshi, Furukawa Kazuro, Okuyama Eiki
Proceedings of JSPE Semestrial Meeting ( The Japan Society for Precision Engineering ) 2017 ( 0 ) 293 - 294 2017
Profile shape evaluation by detecting tangential angles of the profile is competent for evaluating large objects precisely. We consider profile evaluation using a gyro for detecting the angles. We had already proposed and demonstrated a method using a continuously rotating gyro around an axis perpendicular to its angular sensitive axis in order to eliminate its rate offset and scale factor, which are considered to be major error factors in angle detections by using gyros. Here, we consider angle derivation without approximation for the method mentioned above and evaluate it with simulations.