Methodology Based on Photogrammetry for Testing Ship-Block Resistance in Traditional Towing Tanks: Observations and Benchmark Data

Abstract

The real resistance that a ship must face when it is navigating in ice floes is the key factor for knowing the necessary power and the required engine size. The aim of this work is to provide valuable data to help other research in which numerical frameworks will be developed to study ship navigation in broken ice. In this work, we used paraffin wax as an alternative to obtain affordable solutions, avoiding the high cost of ice tests. The experiments were carried out in a traditional basin facility and they consisted of towing tank tests with a ship model using different concentrations of blocks simulated by the use of paraffin wax. Photogrammetry was used as technique to determine the initial position of the ice blocks, which is important as starting data in the current development of numerical simulation code for studying the features of ship resistance in drift ice. These data are available for some ice concentrations in attached files. In addition, a procedure for testing in traditional towing facilities is presented and discussed. The results of the resistance obtained in the experiments in the presence of simulated floes are presented for three concentrations and three model speeds. Some findings may be applicable to ice sailing, under given circumstances.

Surrogate Model Based on Artificial Neural Network for the Fast Prediction of Hydrodynamic Resistance for Bulbous Bow Vessels

“…Increasing computing capabilities have made CFD analysis an attractive alternative to estimate resistance prediction, especially for optimization purposes, reducing analysis time from days to several hours. Although numerical solutions are mostly used nowadays, traditional experimental tests have not been totally replaced, since there is still a need for validation of these numerical tests, as many authors show in their works ([6]- [9]).…”

Broken Ice Photogrammetry in Model-Scale Experiments with Sloped Structure

“…In these cases, the planar dimensions of thousands of objects floating on the water surface have been retrieved, which allowed researchers to draw conclusions on the floe size distribution after a physical action, i.e., wave ice breakage. The nadir position of a camera can be achieved by using a crane, which can move high above the scene [16,17]. For nadir images, there are still some issues of recognition demanding manual corrections such as the over-segmentation of peculiar-shaped ice floes or the under-segmentation of tightly positioned floes.…”