Micromechatronics
Online ISSN : 2432-0358
Print ISSN : 1343-8565
ISSN-L : 1343-8565
Volume 48, Issue 2
Displaying 1-9 of 9 articles from this issue
  • Article type: Cover
    2004 Volume 48 Issue 2 Pages Cover1-
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
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  • Article type: Cover
    2004 Volume 48 Issue 2 Pages Cover2-
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
    Download PDF (26K)
  • Ken SASAKI
    Article type: Article
    2004 Volume 48 Issue 2 Pages 1-10
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
    This paper proposes a tactile display method based on characteristics of human tactile sensation. Tactile sensing and display is different from that of visual or audio signals because it involves physical contact with the object and the display device. Because of this difference in sensing and displaying modality, wide bandwidth and dynamic range of the tactile display do not automatically contribute to the enhancement of tactile sensation. Experiment on tactile differentiation by touching a vibrating pin has shown that the necessary bandwidth for tactile display was approximately 300Hz. Experiment on measuring the threshold for recognizing protruding and receding display pin has shown that humans are insensitive to motion below the threshold velocity. This finding has led to a design of tactile display motion for touch and removal of a finger. When the display pin protrudes rapidly and recedes slowly, human will only feel the protrusion, which gives a sensation of "touch". Slow protrusion and rapid receding motion gives a sensation of removal. This effect has been verified by experiments using a remote controlled robot hand.
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  • Ken SASAKI, Kenji YAMAGUCHI, Masaharu TAKANO
    Article type: Article
    2004 Volume 48 Issue 2 Pages 11-19
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
    This paper proposes a vibration attenuation method of a flexible arm utilizing parametric vibration control. Parametric vibration, which is usually discussed in terms of exciting a vibration by changing parameters of a vibration system, can be utilized for attenuating vibration by changing parameters opposite to excitation. A rectangular beam is inserted in a flexible arm and suspended by bearings to allow rotation about its longitudinal axis. Since bending stiffness of a rectangular beam is larger in the direction in which the cross section of the beam is thicker, rotation of the beam changes the direction of bending stiffness of the flexible arm. Controlling the rotational angle of the inner beam attenuates two-dimensional vibration of the flexible arm. Parametric vibration attenuation algorithm is derived theoretically and verified by experiments.
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  • Koichi OZAKI, Tatsuo NARABAYASHI, Akio ISHIZAKA
    Article type: Article
    2004 Volume 48 Issue 2 Pages 20-31
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
    At present, attenuation elements such as the rubber vibration isolator are utilized in order to reduce the resonance of machine structure and building. Especially, "the halfpower method" has been recognized for the identification of damping ratio ζ which shows the damping performance of vibration system for the steady-state response in forced vibration. However, according to the conventional approximate analysis, the error increases over ζ= 0.1, and it is not correspondent to the actual circumstances. On the other hand, the development of the high damping material recently advances, and the case in which it is over the ζ=0.1 damping ratio is increasing very much. Derivation of the exact formula which can correspond for these is urgently necessary. In this report, 1 degree of freedom equivalent model that spring and dashpot were parallelly connected at the mass was set, and it considered response magnification of the force excitation and transmissibility of vibration of the displacement excitation. Especially, half power method using the peak angular frequency was proposed, and then, practical range of damping ratio ζ spread by this method was shown.
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  • [in Japanese]
    Article type: Article
    2004 Volume 48 Issue 2 Pages 32-39
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
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  • [in Japanese]
    Article type: Article
    2004 Volume 48 Issue 2 Pages 40-53
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
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  • Article type: Appendix
    2004 Volume 48 Issue 2 Pages 54-57
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
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  • Article type: Appendix
    2004 Volume 48 Issue 2 Pages 68-
    Published: June 10, 2004
    Released on J-STAGE: November 09, 2017
    JOURNAL FREE ACCESS
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