Crane Double Cycling in Container Ports: Affect on Ship Dwell Time

This paper provides a quantitative analysis of the impact of double cycling on crane efficiency at ports. Double-cycling is a technique for improving the utilization of quay cranes by converting empty crane moves into productive ones by having containers loaded and unloaded simultaneously. By allowing the crane to carry a container while moving from the apron to the ship as well as from the ship to the apron, the number of containers in a cycle is doubled. Two solution algorithms and simple formulae are presented for estimating reductions in the number of operations and operating time. The problem is also extended to include an analysis of double-cycling when ships have deck hatches. Results are presented for simulated vessels and compared to empirical data from a real-world trial. Analytical methods are shown to be useful in addition to numerical methods for providing greater insight. Finally, the paper demonstrates that double-cycling can create significant efficiency gains.

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    University of California, Berkeley

    Institute of Transportation Studies
    McLaughlin Hall
    Berkeley, CA  United States  94720

    National Science Foundation

    Engineeing and Applied Science, 1800 G Street, NW
    Washington, DC  United States  20550

    California Department of Transportation

    Office of Research, P.O. Box 942873
    Sacramento, CA  United States  94273-0001
  • Authors:
    • Goodchild, Anne V
    • Daganzo, Carlos
  • Publication Date: 2005-7


  • English

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  • Accession Number: 01005230
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: UCB-ITS-RR-2005-5
  • Contract Numbers: CMS-0313317
  • Created Date: Oct 13 2005 1:08PM