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Development of a portable 3D hull roughness analyzer

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Abstract

On the surface of a ship’s hull, roughness due to paint has significant effects on the ship’s resistance. In the ship design stage, the roughness resistance coefficient, ∆Cf, is commonly estimated by the ITTC1978 formula using Ks as a roughness parameter. Ks is also known as the average hull roughness, which is composed of the average of the Pt50 (the difference between the maximum peak height and the maximum valley depth in an evaluation length of 50 mm) values collected from multiple locations on the ship’s hull, using the BSRA hull roughness analyzer. The analyzer has been widely used because it is simple and easy to use and suitable at actual shipbuilding sites. However, this analyzer is only able to measure Pt50 values. In past studies, it has been indicated that not only the roughness height parameter but also wavelength parameter can affect friction resistance. Hence, here we have developed a new portable roughness measurement device that can measure various parameters, including the wavelength, and obtain three-dimensional (3D) profile images. This newly developed portable roughness analyzer can compile a large quantity of 3D images of surface roughness and calculate various parameters from the measured roughness profiles.

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Acknowledgements

This research has started with a feasibility study project of Japan Ship Machinery and Equipment Association. The project could not have been accomplished without great support and corporation of Professor Yasuyuki Toda of Osaka University, Professor Yasuo Kawaguchi of Tokyo university of Science, Professor Kaoru Iwamoto of Tokyo University of Agriculture and Technology, and Mr. Hideki Kawashima and Mr. Hiromoto Ando of National Maritime Research Institute. The research then continued to be carried out for the project “Next generation environmental related technology development support program” of Japanese Ministry of Land, Infrastructure, Transport and Tourism, and as a joint research with ClassNK, both entitled “Method to estimate the changing ratio of in situ friction resistance using the data of reduced surface roughness and roughness parameters of hull coating”.

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Authors and Affiliations

  1. Chugoku Marine Paints., LTD, 1-7 Meijishinkai, Otake, Hiroshima, 739-0652, Japan

    Hirohisa Mieno

  2. Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinada, Kobe, 658-0022, Japan

    Tokihiro Katsui

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  1. Hirohisa Mieno
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  2. Tokihiro Katsui
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Correspondence to Hirohisa Mieno.

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Mieno, H., Katsui, T. Development of a portable 3D hull roughness analyzer. J Mar Sci Technol 25, 498–509 (2020). https://doi.org/10.1007/s00773-019-00656-x

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  • DOI: https://doi.org/10.1007/s00773-019-00656-x

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