日本舶用機関学会誌
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
19 巻, 7 号
選択された号の論文の3件中1~3を表示しています
  • 1984 年 19 巻 7 号 p. 497-536
    発行日: 1984/07/01
    公開日: 2010/05/31
    ジャーナル フリー
  • 馬場 宣裕, 井野 幸雄, 佐々木 康夫
    1984 年 19 巻 7 号 p. 547-560
    発行日: 1984/07/01
    公開日: 2010/05/31
    ジャーナル フリー
    The authors had a chance to measure simultaneously the ship oscillation, the hull vibration, various stresses of the propeller shaft and the fluctuations of the hydraulic pressure induced by the propeller. From the results of the statistical and the time-series analysis of these data, it is clear that there is a relation between the fluctuations of these data and the ship motion, the pitching motion in particular. As the example of the data application, the strength of the propeller blade in service condition is discussed. The stress of the propeller blade can be calculated theoretically by the lifting surface theory and the finite element method. Using this calculating program and the data, the simulating method to estimate the blade stress in service condition is proposed. Furthermore, using the fatigue and the crack propagation data of the propeller material, the correlation chart between the crack length and the life time of the propeller to failure is made.
  • 有坪 博文, 小川 孝久
    1984 年 19 巻 7 号 p. 561-565
    発行日: 1984/07/01
    公開日: 2010/05/31
    ジャーナル フリー
    Emergency seals are used when the ship at sea is subjected to repairs and checks to the working seals. Emergency seals are required not only high reliability but also the function of the working seal because it can be expected that the ship is compelled to be at sea for a short time with the use of the emergency seal if the working seal failed to receive repairs.
    Conventional emergency seals have been applied rubber packings of hollow type and developed the function of the seals with the rubber expanded by applying a pressure inside. Against this, the seal having lately been developed has been applied a rubber packing of simple O-ring type. This is a new method to develop the function of the seal with a pressure applied from outside the O-ring for equal shrinkage to the shaft side.
    It has been confirmed through a series of experimental results that, compared with conventional types, the emergency seal of the new type provides high reliability, stability, and excellency in addition to the function of working seals.
feedback
Top