Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 30, Issue 2
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_1991_2
Displaying 1-12 of 12 articles from this issue
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PROPOSAL FOR SAFETY
  • Evaluation　of　Hazardous　Properties for　Aliphatic　Nitrate
    Yasutake Hara，Miyako Akiyoshi and Hidetsugu Nakamura, Shun-ichi Sato
    1991 Volume 30 Issue 2 Pages 84-87
    Published: April 15, 1991
    Released on J-STAGE: August 31, 2017
    DOIhttps://doi.org/10.18943/safety.30.2_84
    JOURNAL FREE ACCESS
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    The　thermochemical　data　such　as　boiling　point，heat　of　vaporization　and　flash　point，and　kinetic　parameter for　aliphatic　nitrate　were　measured　to　evaluate　their　hazardous　properties.

    Owing to the greater attractive forces in a liquid increase as the chain becomes longer，resulting in higher boiling points and greater heat of vaporization， Flash point（Tf）is a linear function of boiling point （Tb）as same　as　alkanes.

    The　rate　equation　in　isothemal　decomposition　are 1／2－order　and　the　compenzation　effect　is　found　between logarithm　of　the　frequency　factor　and　the　activation　energy，then　the　decomposition　proceeds　with　similar reaction　mechanism　for　each　nitrate．

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  • Development　of　Monitoring　System　of　a　Rotary　Machine　at　its　Critical
    Construction　of　Inspection　Device　of　Balancing　Condition for　a　Rotor　Crossing　over　Critical　Speed
    Takabumi Fukuda, Hisaji Shimizu
    1991 Volume 30 Issue 2 Pages 88-94
    Published: April 15, 1991
    Released on J-STAGE: August 31, 2017
    DOIhttps://doi.org/10.18943/safety.30.2_88
    JOURNAL FREE ACCESS
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    Rotary　machilles，which　is　operated　over　critical，are　accelerated　up　above　critical　speed　after　balancing procedure，It　is　dimcult　for　evell　a　skilled　operator　to　judge　from　vibration　Ievel　with　disturbance　and　noise　during accelerathlg　whether　a　rotor　has　good　balancing　enough　to　pass　criUcal　speed　or　not，Therefore，it　is　desired　to develop　some　monitorillg　system　to　diagnose　balancing　condition　by　on line　in　real－time. Then　in　order　to diagnose　balancing　condition　of　a　rotor　under　uncertain　variations　of　vibration　level，the　monitoring　system　with prediction　mode1（Kalma filter）was　developed　and　installed　in　personal　computer，After　considering　adequacy of　model　alld　comparing 3 kinds　of　sensors　used　this　system，the　performance　of　this　system　was　compared　with other　techniques，111experiment，this　monitoring　system　could　diagnose　balancing　condition　of　a　rotor　at　about 20 rps　whose　critical　speed　was 43 rps，And　these　performance　were　higher　than　other　diagnostic　techniques　based on　vibration　leve1．Through　these　investigations，it　is　clarified　that　this　system　using　prediction　model　is　capable of　inspecting　rotor　colldition．

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TECHNICAL NOTE
TECHNICAL REPORT
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