Journal of the Japan Society for Precision Engineering
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
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Volume 78, Issue 12
Displaying 1-29 of 29 articles from this issue
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Special Issue: Latest Advences in Plating Technology
Review
Lecture
My Experience in Precision Engineering
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Introduction to Precision Engineering
Introduction of Laboratories
 
Paper
  • Relation between Morphology of Artificial Creature and Behavioral Ability in the Virtual Fluid Environment
    Keita NAKAMURA, Ikuo SUZUKI, Masahito YAMAMOTO, Masashi FURUKAWA
    2012 Volume 78 Issue 12 Pages 1069-1075
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1069
    JOURNAL FREE ACCESS
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    Morphology of an artificial creature plays an important role in the behavior acquisition of them because the behaviors strongly depend on its morphology. In this study, it is examined how the behavior differences appear when its morphology changes in the virtual fluid environment. We construct the approximate virtual fluid environment with low computing costs to simulate the behavior acquisition for them. Also we propose a simulation method for them in consideration of effects from the virtual fluid environment based on physics modeling. Results are discussed on a relation between its morphology and acquired behaviors.
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  • High-Precision 3D-Shape Measurement Using Interferograms Exposured Under Vertical Vibration
    Masaaki ADACHI, Tatuyo SABUTA, Yasuto NIWA
    2012 Volume 78 Issue 12 Pages 1076-1081
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1076
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    Vertical-scanning shape-measurement interferometry using white light could not be used under vertically vibrating environment. Because, it is required to repeat predefined-length vertical movement with nanometer accuracy and interferogram capturing just after the movement. We developed the technology which can measure changes of optical path difference (OPD) of an interferometer at around 20-μs interval and can trigger interferogram exposure at even the moment when predefined-length movement complets irregularly due to external vibrations. But vibration during exposure does change interferogram intensities captured. This changes result in phase extraction errors and then shape measurement errors. Then we developed the phase-extraction method which utilizes the history of OPD change during exposure and might remove the above errors. In this paper, validity of this method is estimated by shape-measurement experiments using pulse-like vertical vibrations.
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  • A Dynamic Measurement System for Two-dimensional Birefringence Distribution with Sub-millisecond Time Resolution
    Takashi ONUMA, Yukitoshi OTANI
    2012 Volume 78 Issue 12 Pages 1082-1086
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1082
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    A dynamic measurement system for two-dimensional birefringence distribution is developed in order to analyze high-speed stress phenomenon. Until now, a high-speed image sensor has been applying to various applications such as mechanical motion analysis and fluorescent imaging for bio-cell based on its capability of repeating high-speed sampling. However, there are not so much reports concerning polarization application with high-speed image sensor. Although, we have already proposed various birefringence measurement methods by using rotating retarders, photo elastic modulators and liquid crystal modulators, it is still difficult to get higher sampling speed due to its limitation of mechanical movement. In this research, a new high-speed polarization sensor with pixelated micro-polarizer was developed and birefringence retardation and azimuthal angle are analyzed within sub-millisecond by phase shifting technique.
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  • Study of Anomaly Detection on Tracking of Residual Vector based on Subspace Method
    Shunji MAEDA, Hisae SHIBUYA
    2012 Volume 78 Issue 12 Pages 1087-1092
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1087
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    Fast and accurate anomaly detection is becoming essential in maintenance services. This paper proposes a novel detection approach based on the subspace method. To achieve high performance of the method, a part of learning data is respectively selected based on the distance between observed data and learning data to form a subspace. Next the residual vector headed from the subspace to the observed data is tracked to identify the anomaly category. To detect anomaly in spite of instability of transient sensing data, the starting point variability of the residual vector is also used to absorb the instability. Experimental results demonstrate that proposed method is beneficial to anomaly detection tasks.
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  • A Method for On-line Identification of Oscillatory Type Machine Model Including Nonlinear Friction (2'nd Report)
    —A Practical Method for On-line Identification of Machine Parameters Described by Two-Inertia System—
    Yukio TOYOZAWA, Naoto SONODA, Hiroshi HARADA, Hiroshi KASHIWAGI
    2012 Volume 78 Issue 12 Pages 1093-1098
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1093
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    The linear actuator driven by a ball screw mechanism is widely used in the machine tools, since it can raise the machine speed higher. For the purpose of the stability in continuous path control of this type mechanism, it is important to identify the machine parameters, such as inertia, spring stiffness and dominant nonlinear friction. In the previous paper, we presented practical method for identifying the nonlinear parameters of the table driven by a ball screw mechanism and showed the effectiveness by the computer simulation. In the proposed method, the mechanical system is modeled as two-inertia system. Then, the two-inertia system is represented as an inverse model and a low pass filtered M-sequence is used as an input signal. The mechanical parameters are identified by using the steepest descent method with a dead band. This paper confirms effect of the proposed method from the results of the experimentation. The identified mechanical parameters quickly approach to the true mechanical parameters without measuring the velocity of the table.
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  • Motor Fabrication Process Using Divided Cores
    —Development of High Efficient Brushless DC Motors for Middle to Large Size Compressor Motors—
    Kazuyuki YAMAMOTO, Hayato YOSHINO, Koji MASUMOTO, Fumio MIYAZAKI
    2012 Volume 78 Issue 12 Pages 1099-1104
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1099
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    This paper presents the motor manufacturing technology for brushless DC motors which are used for middle to large size compressor motors and industrial motors, etc.We propose the divided core assembled by partial press-fitting which enables production with small capital investment, in spite of small manufacturing quantities of a wide variety of middle to large size motors. This type of divided core has the following features : (1) Concentrated high-density winding can be achieved, because this type of core is divided in units of pole. (2) The stator can be assembled easily with the core divided in units of pole, by using the press-fitting technique. (3) Divided core assembly with low press-fitting pressure and required accuracy is performed, even if stator becomes large. Based on this technology, compressor motors are fabricated and their characteristics are examined. As a result, compared to conventional compressor motors with a distributed winding structure, weight saving of approximately 20%, downsizing in the axial direction of approximately 30% and motor efficiency improvement of 1 - 3% are achieved.
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  • Development of a Transportation System with Multiple Conveyor Belts
    —Conditions for Transportation and Scheduling—
    Rei HINO, Michitaka HARADA
    2012 Volume 78 Issue 12 Pages 1105-1111
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1105
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    Necessary and sufficient conditions for material handling scheduling are clarified in order to construct a flexible and agile transportation system composed of multiple conveyor belts. In addition to a conventional straight forward belt, a special type of belt is adopted to change the material flow direction when transporting a product between two manufacturing resources. In the present paper, three essential motions of the belts are identified, which are translation on the belt, transition between two belts and rotation of the belt. The time conditions of each motion are formulated strictly for the synchronization of two belts. Furthermore, a representative scheduling problem is introduced according to the derived conditions for multiple conveying paths in a production shop. The scheduling problem is formulated in a mixed integer programming manner and solved numerically to accomplish the production without any conflicts during the transportation.
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  • Preparation of Carbon Onion Gel and Characterization of its Tribological Properties
    Tatsuro SADANAGA, Shinji SAITO, Atsushi HIRATA
    2012 Volume 78 Issue 12 Pages 1112-1116
    Published: December 05, 2012
    Released on J-STAGE: June 05, 2013
    DOIhttps://doi.org/10.2493/jjspe.78.1112
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    Carbon onion is added to an ionic liquid of 1-Butyl-3-methylimidazolium-tetrafluoroborate (BMImBF4) and then ultrasonically dispersed. After the mixture is centrifuged to remove excess BMImBF4, the mixture loses liquidity and forms carbon onion gel like paste with viscoelasticity. The tribological properties of carbon onion gel are characterized in air and vacuum at room temperature and 200 degrees centigrade by ball-on-disk type friction testing. Carbon onion gel shows lower friction coefficient than neat BMImBF4 in vacuum at room temperature and 200 degrees centigrade. Furthermore, epoxy resin coatings are prepared with the addition of carbon onion gel to reduce the influence of the viscoelasticity. The result of friction measurements in air is that epoxy resin including carbon onion gel is more lubricative than neat epoxy resin. Friction tests under various normal loads reveal that the coating including carbon onion gel exhibit lubricating behavior like semisolid lubricants such as grease. Epoxy resin coating including carbon onion gel also provides low and stable friction coefficient of 0.05-0.06 in vacuum.
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