A Validated Tool for Evaluating the Design and Predicting the Workability of Dredgers
Type:
Presented during:
WODCON XX: "The Art of Dredging" - 2013, Brussels, Belgium
Authors:
Hannot SDA, Los JG, Van Spaendonk BAW , Krijger ACL, Kruijswijk AB
Abstract: This paper will discuss the ‘Dynamic Operations in Dredging and Offshore’ (DODO) tool as developed by IHC Merwede. The tool can be used to evaluate conceptual designs in an early design phase as well as for the more refined design evaluation required later on in the product life cycle.
The DODO tool is a modeling tool that combines physical models for 3 fields to enable the simulation of the complete motion of dredgers and offshore vessels:
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Ship hydrodynamics, for simulating the motion of the ship or barge.
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Multibody dynamics, for simulating the motion of the equipment attached to the ship.
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Soil dynamics, for simulating the characteristic Dredging forces such as cutting and trailing.
This paper will first show how the three fields mentioned above are implemented. Also the linearization procedure for frequency domain analysis, which is an essential tool for quick design evaluation will be introduced.
Subsequently two sections will follow on the validation process. A section on Cutter Suction Dredgers validation where two types of measurement results will be compared with simulation results
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Model Tank results for different wave conditions
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Sea trial results with an actual Beaver 6518
And a section on Trailing Suction Hopper Dredgers, for which the same type of measurements will be compared:
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Model Tank results for different wave and hull conditions
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Sea trial results with an actual hopper dredger
Thereafter applications of the tool are discussed. This discussion focusses on two aspects:
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The generality and expandability of the tool
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The tool during the design process
These points will be illustrated with some examples, such as the simulations for the design of a backhoe dredger and a large cutter suction dredger.
Finally the conclusions and directions for further work will be presented.
Keywords: Workability, Design, Motion, Simulation