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Author: search.filters.author.Fujii, YusakuSubject: search.filters.subject.Inertial force

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    Review of the levitation mass method a precision mechanical measurement method
    (2011-05-02)
    Fujii, Yusaku
    ;
    Jin, Tao
    ;
    Mitatha, Somsak
    ;
    Yupapin, Preecha P.
    ;
    Hou, Wenmei
    This paper firstly has a brief review of the present status and future prospects of a method for precision mechanical based on the levitation mass method (LMM). The LMM has been proposed and improved by the author. The force generated by the actuator is measured as the inertial force of the mass levitated with sufficiently small friction using an aerostatic linear bearing and connected to the moving part of the actuator. During the measurement, the Doppler shift frequency of the laser beam reflected by the mass is measured with a high accuracy with the help of an optical interferometer. Subsequently, the velocity, position, acceleration, and inertial force of the mass are calculated using based on this frequency. Simultaneously, the current and voltage supplied to the actuator are measured.
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    A method for evaluating dynamical friction in linear ball bearings
    (2010-11-01)
    Fujii, Yusaku
    ;
    Maru, Koichi
    ;
    Jin, Tao
    ;
    Yupapin, Preecha P.
    ;
    Mitatha, Somsak
    A method is proposed for evaluating the dynamical friction of linear bearings, whose motion is not perfectly linear due to some play in its internal mechanism. In this method, the moving part of a linear bearing is made to move freely, and the force acting on the moving part is measured as the inertial force given by the product of its mass and the acceleration of its centre of gravity. To evaluate the acceleration of its centre of gravity, the acceleration of two different points on it is measured using a dual-axis optical interferometer. © 2010 by the authors; licensee MDPI, Basel, Switzerland.
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    Material tester with static and dynamic micro forces
    (2009-01-01)
    Fujii, Yusaku
    ;
    Maru, Koichi
    ;
    Shu, Dong Wei
    ;
    Gu, Bin
    ;
    Yamaguchi, Takao
    Material testers with static and dynamic micro forces based on the Levitation Mass Method (LMM) are reviewed. In the LMM, the inertial force of a mass levitated using a pneumatic linear bearing is used as the reference force applied to the objects under test, such as force transducers, materials or structures. The inertial force of the levitated mass is measured using an optical interferometer. The previous achievements and the future prospects on the methods of generating and measuring the static and dynamic micro-Newton level forces based on the LMM are discussed. © 2009 Elsevier B.V. All rights reserved.