engleski

Measurement of structure deformation in the machinery space after launching using photogrammetry method

The ship propulsion alignment is important activity for quality and reliable operation. The alignment procedure is under classification society rules, which determines guidelines for design, calculation and installation of the propulsion system elements. Part of the classification society guidelines is related to measurement of the hull deformations. Parameters that have to be measured and controlled after alignment procedure are bearing vertical offset, bearing reactions, misalignment angles, crankshaft deflections, and shaft and bearing strength. Changes of the parameters could be caused by ship loading condition, temperature variation affecting the propulsion shafting system and launching. Paper presents use of digital photogrammetry for measurement of the structure deformation in the machinery space and displacements of the main engine after launching. Theoretical basis and measurement equipment of digital photogrammetry are presented. The automated photogrammetric system TRITOP, presented in the paper, is used for 3D measurements, results processing and analysis. Measurement procedure and results are illustrated by an example. Structure in the machinery space is measured before and after launching. Measuring results are overlapped in the common coordinate system. Results analysis contains information about hull deformation and it is very important for ship propulsion alignment. Conclusion contains review of the measuring method applicability, advantages of the digital photogrammetry and suggestions for the propulsion alignment development.

propulsion system alignment; deformation measurement; digital photogrammetry

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