舶用ディーゼル機関用チェーンの安全性評価法に関する一考案 A Consideration for the Security Evaluation Method of the chain in the Marine Diesel Engines

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The chains for the 2nd order moment compensator in the marine diesel engines are designed usually to have extremly large safty margin. However, in a certain ship with the relatively large counter weight to reduce the hull vibration, it is possible to occur the non-linear vibration of the chain by the two node torsional vibration of the crank shaft.<BR>For this problem, the non-linear vibration analysis of the chain was carried out with the measured spring characteristics by means of the chain tightener mechanism, which was represented by the form of T<I><SUB>q</SUB></I>=k<SUB>1</SUB>⋅θ+k<SUB>3</SUB>⋅θ<SUP>3</SUP>.<BR>In order to avoid such a non-linear vibration of the chain, it is important to increase the socalled ith order critical speed n<I><SUB>c</SUB></I>= (60/2π) √k<SUB>1</SUB>/I/i of the chain, which is related to the linear part of the chain spring characteristic k<SUB>1</SUB>, comparing with the rated engine speed n<I><SUB>MCR</SUB></I>. This can be obtained by increasing k<SUB>1</SUB> or decreasing the moment of inertia I of the counter weight. Also, the increase of k<SUB>1</SUB> is able to be realized by increase of the initial chain tension F<SUB>0</SUB> or by stepping up the size of the chain and etc.<BR>From this point of view, in this paper, a security evaluation method for the chain was considered in relation to the value of n<I><SUB>c</SUB></I>/n<I><SUB>MCR</SUB></I>, on the basis of the reaults of the non-linear vibration analysis of the chain.

収録刊行物

  • 日本舶用機関学会誌  

    日本舶用機関学会誌 31(9), 661-669, 1996-09-01 

    The Japan Institute of Marine Engineering

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各種コード

  • NII論文ID(NAID)
    10002041129
  • NII書誌ID(NCID)
    AN00196373
  • 本文言語コード
    JPN
  • 資料種別
    OTR
  • ISSN
    03883051
  • NDL 記事登録ID
    4028297
  • NDL 雑誌分類
    ZN24(科学技術--運輸工学--船舶)
  • NDL 請求記号
    Z16-747
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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