JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Volume 23, Issue 10
Displaying 1-9 of 9 articles from this issue
  • [in Japanese]
    1988 Volume 23 Issue 10 Pages 631-637
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
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  • Ryuichi Kimura, Hiroshi Mizutani
    1988 Volume 23 Issue 10 Pages 638-647
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    This paper describes the system which abnormal condition of engine is diagnosed by its radiated sound. Valve clearance of the exhaust valve and injection pressure of fuel valve are selected as factors indicating abnormalities, and valve clearance experiments are carried out for various valve clearances ranging from 0.1 to 1.3mm and injection pressure experiment are for injection pressures ranging from 110kgf/cm2 {10.8MPa} to 300kgf/cm2 {29.4MPa} . Standard values of valve clearance and pressures are 0.4mm and 190kgf/cm2 {18.6MPa}, respectively.
    In this system, the diagnostic algorithm consists of several segments, which deal with sound picking, degitalization of sound signal, spectral analysis and statistical analysis. These processes are handled quickly and continuously by a microcomputer. Using above-mentioned system, the diagnose is tried for the operating engine. As a result, the diagnose takes time of 11.1 seconds each, and its results are successfully obtained.
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  • Iwao Honda, Yoshihiko Irie, Tadao Nakamura
    1988 Volume 23 Issue 10 Pages 648-653
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Recent studies on the vibration intensity are seemed to break in an advanced stage, and to bring forth a powerfull tool for structure-borne sound measurement, such as the acoustic intensity method which has brought a strong influence on acoustic measurement.
    Especially, in order to find the control measures of structure-borne noise from mechanical structures, it is necessary to take place the structure-borne noise measurements as the transmission path, the power flow ranking and the source location.
    This paper presents a measurement technique of vibration intensity using accelerometer array and describes the results of numerical survey and experimental one.
    Major points of this paper are as follows.
    (1) The vibration intensity both in spatial average and farfield is formulated with the forward and the backward wave components, based on a finite difference approximation for the acceleration gradient.
    (2) The relationship between the measurement error of vibration intensity and the accelerometer spacing is shown.
    (3) The present method is confirmed by the experiment with a simple plate model.
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  • [in Japanese]
    1988 Volume 23 Issue 10 Pages 654
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (131K)
  • 1988 Volume 23 Issue 10 Pages 654a-658
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (650K)
  • [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 23 Issue 10 Pages 658-665
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (5758K)
  • [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 23 Issue 10 Pages 665-667
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (375K)
  • [in Japanese], [in Japanese]
    1988 Volume 23 Issue 10 Pages 668-672
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (485K)
  • [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 23 Issue 10 Pages 672-677
    Published: October 01, 1988
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (2177K)
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