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Derivation of the calm water performance of a ship through normalisation of shaft power from full scale measurements.

Derivation of the calm water performance of a ship through normalisation of shaft power from full scale measurements.
Derivation of the calm water performance of a ship through normalisation of shaft power from full scale measurements.
This paper presents a method to normalise the shaft power data recorded at high-frequency to derive the baseline (calm water power) curves by applying a shaft power correction. This is carried out using two correction methods for added power due to waves developed for sea-trial measurements - namely, STAWAVE-1 and STAWAVE-2. The calm water power is then obtained as a difference between the measured power and the added power. The results obtained using this normalisation method is compared to filtering techniques. It is shown that the differences between the predictions using the two methods are minimal, with a maximum of 6% at the normal operational speed of the vessel. The normalising method retains about 40 % of the total data, nearly 4 times more than the datasets retained with filtering methods.
1-7
Royal Institution of Naval Architects
Limeletter, Maxime
96ff90c4-96bd-42e8-978a-2cadf759e71f
Lakshmynarayanana, Puramharikrishnnan
b6bde7ae-aa54-4c07-89ee-83687b85fbfa
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7
Limeletter, Maxime
96ff90c4-96bd-42e8-978a-2cadf759e71f
Lakshmynarayanana, Puramharikrishnnan
b6bde7ae-aa54-4c07-89ee-83687b85fbfa
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7

Limeletter, Maxime, Lakshmynarayanana, Puramharikrishnnan and Hudson, Dominic (2018) Derivation of the calm water performance of a ship through normalisation of shaft power from full scale measurements. In Full scale Ship Performance. Royal Institution of Naval Architects. pp. 1-7 .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents a method to normalise the shaft power data recorded at high-frequency to derive the baseline (calm water power) curves by applying a shaft power correction. This is carried out using two correction methods for added power due to waves developed for sea-trial measurements - namely, STAWAVE-1 and STAWAVE-2. The calm water power is then obtained as a difference between the measured power and the added power. The results obtained using this normalisation method is compared to filtering techniques. It is shown that the differences between the predictions using the two methods are minimal, with a maximum of 6% at the normal operational speed of the vessel. The normalising method retains about 40 % of the total data, nearly 4 times more than the datasets retained with filtering methods.

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Normalisation of shaft power from full scale measurements
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Published date: 24 October 2018
Venue - Dates: Full Scale Ship Performance, United Kingdom, 2018-09-24 - 2018-09-25

Identifiers

Local EPrints ID: 426302
URI: http://eprints.soton.ac.uk/id/eprint/426302
PURE UUID: 626feb2f-d857-4718-b234-55f15e684e36
ORCID for Dominic Hudson: ORCID iD orcid.org/0000-0002-2012-6255

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Date deposited: 22 Nov 2018 17:30
Last modified: 08 Aug 2020 01:32

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