Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 59, Issue 6
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_2020_6
Displaying 1-14 of 14 articles from this issue
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Special Issue on Linking Bridge Between ICT and Safety
ORIGINAL PAPER
  • Proposal for Condition-based Maintenance Method using Lubricating Oil Analysis and Machine Learning
    Ryoma Aihara, Ayo Fmakinwa, Tadahiro Shibutani
    2020 Volume 59 Issue 6 Pages 416-423
    Published: December 15, 2020
    Released on J-STAGE: December 15, 2020
    DOIhttps://doi.org/10.18943/safety.59.6_416
    JOURNAL FREE ACCESS
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    This paper provides a novel approach for condition-based monitoring based on lubricant analysis and machine-learning algorithm. We collected used lubricant oil samples from marine diesel engines. Samples were analyzed by using X-ray Fluorescence analysis. Wear elements such as iron were detected quantitatively. The relationship between elements were visualized by Gaussian Graphical Model（GGM）, and it was suggested that iron particles mainly come from wear modes such as the contact between cylinder and piston ring. Kullback-Leibler divergence was used to quantify the change in the GGM. Anomaly scores were calculated for samples and the scores depends on ship routes. Sensitivity analysis revealed that sulfur and calcium from fuel affect the increase in the anomaly score. This approach may provide the quantitative novel information to condition based maintenance.

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TECHNICAL NOTE
  • Collection and Measurements of Flashback Arrestor from Industrial Sites
    Masaaki Yashima
    2020 Volume 59 Issue 6 Pages 424-432
    Published: December 15, 2020
    Released on J-STAGE: December 15, 2020
    DOIhttps://doi.org/10.18943/safety.59.6_424
    JOURNAL FREE ACCESS
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    The industrial accidents concerning gas cutting and welding had occurred frequently. The research institute (JNIOSH) collected the accident information and conducted a field survey. Gas cutting apparatus were collected from many factories and measured their performance. The collection work was done with the cooperation of the Japan Welding Engineering Society (JWES). In this paper, only the results of the dry flashback arrestor are described. 79 dry flashback arrestors for fuel and 31 for oxygen were collected from 50 factories. The collected arrestors had been used for 3 to 21 years. We analyzed the collection questionnaire and measured the performance of those arrestors. In the performance measurement, the visual inspection, the gas-leak test, the reverse-flow test, and the cut-off test were performed. Furthermore, deteriorated, or defective arrestors were disassembled, and the inside was examined. Failures are seen in 3 to 4 years. It is found that the largest number of failures is revers-flow for both fuel and oxygen.

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