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Author: | Kariranta, Risto-Juhani |
Title: | Analysis of the technical performance of a ship in service |
Publication type: | Master's thesis |
Publication year: | 2010 |
Pages: | 88 s. + liitt. 14 Language: eng |
Department/School: | Sovelletun mekaniikan laitos |
Main subject: | Laivanrakennusoppi (Kul-24) |
Supervisor: | Matusiak, Jerzy |
Instructor: | Vihavainen, Tommi |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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Location: | P1 Ark Aalto 3963 | Archive |
Keywords: | ship dynamics hull fouling statistics filtering normalizing propulsion |
Abstract (eng): | Ships technical performance weakens over time as the hull and propeller roughness increases and hull fouling grows. Measuring how much the performance has suffered is difficult as there are many variables affecting to ships performance during normal operation such as waves, wind, shallow water and ships floating position. The aim of this work was by using ships normal sensor for measurements to find an analysis method for measuring the weakened performance. The goal is to do that by normalizing the actual measurements using the knowledge of external environmental and ship conditions and adding filtering for extreme, unessential data due to accelerations, movements and manoeuvres to the measurements to exclude unreasonable results. For being able to normalize the results the dynamic and static phenomenon such as interaction between ship and waves, aerodynamic resistance and theory of hull fouling affecting to the ships performance during normal operation was studied from the literature. The measurements for this analysis were done onboard VLCC using NAPA Log system for collecting the data from the sensors and sending the results ashore. The results were then processed using MS SQL database engine and NAPA hydrodynamic calculations. The results show that the performance indexing indicated weakened performance during the measurement period with good correlation to what the theories would have forecasted. That proves that by using described methods for normalization and filtering the measurements performance can be reliable indicated and this information can be utilized for several benchmarking purposes. |
ED: | 2011-01-10 |
INSSI record number: 41481
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