An overload limiter is used to prevent its overturning accident during an operating of a movable crane. Recently the indirectly measuring method, which measures hoisting load and overturning moment of overload limiter, demands instead of the existing method, which measures only hoisting load. The indirectly measuring method is how to conduct the hoisting load and overturning moment as measuring the load of hydraulic cylinder for a luffing driving of boom. So we need to develop the many-angular pin type load cell with the measuring angle of ±10 degree instead of the existing load cell with the measuring angle of ±2 degree. In this study we conducted the finite element analysis in order to evaluate the effect of the aspect ratio of measuring cross section on the measuring limit of the load cell to develop the many-angular pin type load cell. For this investigation, the aspect ratio of measuring cross section and load applying angle were adopted as design parameters and the stresses of measuring part were evaluated for each parameter.
Recently intermodal transportation systems are significantly considered as enhanced technique or future railroad Logistics. These are aimed for particularly reducing complicated job process in the railroad based transportation and relevant logistic cost in economic viewpoint. In this paper we suggest a horizontal transfer system using hydro-motor and hydro-cylinder for intermodal transportation system. This system can assist to transfer the containers horizontally for train logistics automations.
This study is conducted to provide the reference data for an alarm system to prevent an overturning of a container crane under wind loads. Two methods, namely FSI (fluid-structure interaction) analysis and wind tunnel test, are adopted in this investigation. In order to evaluate the effect of wind load on the stability of the crane, a 50-ton class container crane, widely used in container terminals, is adopted for an analytic model, and 19 values are considered for wind direction as a design parameter. First, the wind tunnel test for the reduced-scale container crane model is performed according to the wind direction using an Eiffel-type atmospheric boundarylayer wind tunnel. Next, FSI analysis for a full-scale container crane is conducted using ANSYS and CFX. Then, the uplift force obtained from FSI analysis is compared with that yielded by the wind tunnel test. Finally, the reference data on the uplift forces for an alarm system are suggested to prevent an accident of a container crane due to windblast.
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