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  • SAGE Publications  (3)
  • Takasaki, Masaya  (3)
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  • SAGE Publications  (3)
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  • 1
    Online Resource
    Online Resource
    A modified zero-power control and its application to vibration isolation system
    SAGE Publications ; 2012
    In:  Journal of Vibration and Control Vol. 18, No. 12 ( 2012-10), p. 1788-1797
    Details
    In: Journal of Vibration and Control, SAGE Publications, Vol. 18, No. 12 ( 2012-10), p. 1788-1797
    Abstract: In this paper we present an improved zero-power controlled magnetic suspension system that has the capability to adjust stiffness. The conventional zero-power control system produces constant negative stiffness, and the stiffness solely depends on the capacity of the permanent magnets or the gap–force coefficient of the magnets. This becomes an obstacle to the fields of application of zero-power control where the adjustment of stiffness is necessary, such as developing a vibration isolation system. In this research, the basic zero-power control system is modified such that it can adjust stiffness by adding a minor proportional feedback of displacement to the zero-power controller. Finally, a vibration isolation system is developed by combining a positive stiffness spring in series with a negative stiffness suspension realized by the modified zero-power controller. The proposed control system and the developed vibration isolation system are investigated both analytically and experimentally.
    Type of Medium: Online Resource
    ISSN: 1077-5463 , 1741-2986
    URL: Article
    DOI: 10.1177/1077546311419985
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2012
    detail.hit.zdb_id: 2070247-4
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Position-insensitive estimation of mass from limit cycle of velocity feedback relay system with Spring
    SAGE Publications ; 2021
    In:  Measurement and Control Vol. 54, No. 7-8 ( 2021-09), p. 1147-1156
    Details
    In: Measurement and Control, SAGE Publications, Vol. 54, No. 7-8 ( 2021-09), p. 1147-1156
    Abstract: Mass measurement using relay feedback of velocity and restoring force compensation is investigated for determining the mass of an object under weightless conditions. In the measurement system, the velocity of the object is fed back through a relay with hysteresis and the force acting on the object is switched from a positive value to a negative value when the velocity reaches a positive threshold and vice versa. As a result, a limit cycle is induced in the measurement system and the mass is estimated based on the period of the limit cycle. In addition, restoring force compensation with a spring is introduced to avoid the drift of the trajectory. This compensation makes the static equilibrium state unique. However, the trajectory still drifts slightly. It causes some error in measurement when a simple formula of estimating mass is applied. To eliminate such an error, a new formula is derived to estimate the mass independently of the position of the trajectory that is determined by the switching positions in the relay actions. When the switching positions deflect from the origin at which the spring is in the natural length, the trajectory is not at the center and becomes asymmetric. It is analytically shown that the period of the limit cycle is minimum when the switching positions are at the origin. It indicates that mass is overestimated with the simple estimation formula when the trajectory is not at the center. The validity of the modified formula and the analytical results are confirmed experimentally.
    Type of Medium: Online Resource
    ISSN: 0020-2940
    URL: Article
    DOI: 10.1177/00202940211021874
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2712343-1
    SSG: 3,2
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  • 3
    Online Resource
    Online Resource
    Realization of a Zero-compliance System by Using Displacement Cancellation Control
    SAGE Publications ; 2010
    In:  Journal of Vibration and Control Vol. 16, No. 4 ( 2010-04), p. 585-599
    Details
    In: Journal of Vibration and Control, SAGE Publications, Vol. 16, No. 4 ( 2010-04), p. 585-599
    Abstract: A control method for achieving zero compliance to direct disturbance is proposed for a vibration isolation system. The structure of the proposed zero-compliance system is as follows. A middle mass is suspended by a spring from the base. The isolation table is suspended and moved by a linear actuator that is fixed to the middle mass. When direct disturbance acts on the isolation table, the middle mass begins to move in the same direction as the disturbance. The actuator operates to move the isolation table in the opposite direction to cancel the displacement of the middle mass to the base. To verify the effectiveness of this principle, a single-axis apparatus was fabricated. In this apparatus, the isolation table and the middle mass are guided to move horizontally to study characteristics without the influence of gravity. A voice coil motor (VCM) is installed between the isolation table and the middle mass, and integral—proportional—derivative (I-PD) control is implemented to achieve displacement cancellation control. Another VCM is installed between the middle mass and the base, and PD control is implemented for realizing the prescribed stiffness and damping. The efficacy of the designed control system is confirmed experimentally.
    Type of Medium: Online Resource
    ISSN: 1077-5463 , 1741-2986
    URL: Article
    DOI: 10.1177/1077546309106151
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2010
    detail.hit.zdb_id: 2070247-4
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