Hopper Slopes in the Cargo Holds of Self-unloading Ships

DOI Open Access

Bibliographic Information

Other Title
  • セルフアンローディング船の船倉におけるホッパー傾針角

Description

In order to estimate the main hopper side slope in the cargo holds of self-unloading ships, a triangular, rigid, powder block was assumed at the transition of the walls of the cargo hold. When a given size of the powder block just slid off the hopper walls, the critical hopper slope was calculated from the force balance on the powder block.<br>The calculated critical hopper slope increased with a decrease in the size of the powder block, and a maximum value was obtained when the powder block became infinitely small. For the desigh of the cargo hold, this maximum value was taken as a lower bound of the main hopper side slope.<br>When assuming that the cargo hold is for carrying coal, the calculated hopper slope was 40°against an ulrta high molecular weight polyethylene plate, and was 51°against a steel plate. These calculated results were slightly large in comparison with the main hopper side slope adopted in the cargo holds of existing self-unloading ships. Consequenty, a low hopper slope required both a low frictional coefficient and a low adhesive force between the powder and the wall material of the hopper.

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Keywords

Details 詳細情報について

  • CRID
    1390282679489115648
  • NII Article ID
    130003951601
  • DOI
    10.4164/sptj.19.273
  • ISSN
    18837239
    03866157
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • Abstract License Flag
    Disallowed

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