A Concept for Improved Crane Performance in Offshore Operations.

摘要

The joint Army/Navy Marine Corps Off-Shore Discharge of containership I and II (OSDOC I and II) Test/Evaluation exercises were conducted in 1970 and 1972, respectively, in order to explore through test and evaluation various techniques for unloading containership moored offshore using full-scale equipment in a real environment. The primary difficulty encountered throughout the test was the inability to accurately place the container in the lighter. Two of the problem areas identified were the swinging of a container suspended from a crane operating on a ship or barge in a seaway and the potential for impacts of the container when the crane lowers it onto the deck of a lighter responding independently to the seaway. This report summarizes various approaches and concepts for controlling container swing and impact caused by wave induced motion and examines the techincal feasibility of two specific and promising methods: the rider block tag line system (RBTS) and shock absorbing spreader bar (SASB). Conclusions and recommendations are provided. (Author)