A brute-force spectral approach for wave estimation using measured vessel motions

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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A brute-force spectral approach for wave estimation using measured vessel motions. / Nielsen, Ulrik D.; Brodtkorb, Astrid H.; Sørensen, Asgeir J.

In: Marine Structures, Vol. 60, 2018, p. 101-121.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Nielsen, Ulrik D. ; Brodtkorb, Astrid H. ; Sørensen, Asgeir J. / A brute-force spectral approach for wave estimation using measured vessel motions. In: Marine Structures. 2018 ; Vol. 60. pp. 101-121.

Bibtex

@article{2dd76f082b8a460b817943df6a88ae96,
title = "A brute-force spectral approach for wave estimation using measured vessel motions",
abstract = "The article introduces a spectral procedure for sea state estimation based on measurements of motion responses of a ship in a short-crested seaway. The procedure relies fundamentally on the wave buoy analogy, but the wave spectrum estimate is obtained in a direct - brute-force - approach, and the procedure is simple in its mathematical formulation. The actual formulation is extending another recent work by including vessel advance speed and short-crested seas. Due to its simplicity, the procedure is computationally efficient, providing wave spectrum estimates in the order of a few seconds, and the estimation procedure will therefore be appealing to applications related to realtime, onboard control and decision support systems for safe and efficient marine operations. The procedure's performance is evaluated by use of numerical simulation of motion measurements, and it is shown that accurate wave spectrum estimates can be obtained for all wave directions in short-crested waves, taking the wave system to be composed by both wind generated sea and swell. Furthermore, the procedure is tested using full-scale motion data obtained from sea trials. Good wave estimations are achieved as compared to corresponding results from a free-floating (classical) wave buoy.",
keywords = "Doppler shift, Sea trials data, Spectrum transformation, Wave buoy analogy, Wave spectrum estimation, Wave-induced vessel responses",
author = "Nielsen, {Ulrik D.} and Brodtkorb, {Astrid H.} and S{\o}rensen, {Asgeir J.}",
year = "2018",
doi = "10.1016/j.marstruc.2018.03.011",
language = "English",
volume = "60",
pages = "101--121",
journal = "Marine Structures",
issn = "0951-8339",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - A brute-force spectral approach for wave estimation using measured vessel motions

AU - Nielsen, Ulrik D.

AU - Brodtkorb, Astrid H.

AU - Sørensen, Asgeir J.

PY - 2018

Y1 - 2018

N2 - The article introduces a spectral procedure for sea state estimation based on measurements of motion responses of a ship in a short-crested seaway. The procedure relies fundamentally on the wave buoy analogy, but the wave spectrum estimate is obtained in a direct - brute-force - approach, and the procedure is simple in its mathematical formulation. The actual formulation is extending another recent work by including vessel advance speed and short-crested seas. Due to its simplicity, the procedure is computationally efficient, providing wave spectrum estimates in the order of a few seconds, and the estimation procedure will therefore be appealing to applications related to realtime, onboard control and decision support systems for safe and efficient marine operations. The procedure's performance is evaluated by use of numerical simulation of motion measurements, and it is shown that accurate wave spectrum estimates can be obtained for all wave directions in short-crested waves, taking the wave system to be composed by both wind generated sea and swell. Furthermore, the procedure is tested using full-scale motion data obtained from sea trials. Good wave estimations are achieved as compared to corresponding results from a free-floating (classical) wave buoy.

AB - The article introduces a spectral procedure for sea state estimation based on measurements of motion responses of a ship in a short-crested seaway. The procedure relies fundamentally on the wave buoy analogy, but the wave spectrum estimate is obtained in a direct - brute-force - approach, and the procedure is simple in its mathematical formulation. The actual formulation is extending another recent work by including vessel advance speed and short-crested seas. Due to its simplicity, the procedure is computationally efficient, providing wave spectrum estimates in the order of a few seconds, and the estimation procedure will therefore be appealing to applications related to realtime, onboard control and decision support systems for safe and efficient marine operations. The procedure's performance is evaluated by use of numerical simulation of motion measurements, and it is shown that accurate wave spectrum estimates can be obtained for all wave directions in short-crested waves, taking the wave system to be composed by both wind generated sea and swell. Furthermore, the procedure is tested using full-scale motion data obtained from sea trials. Good wave estimations are achieved as compared to corresponding results from a free-floating (classical) wave buoy.

KW - Doppler shift

KW - Sea trials data

KW - Spectrum transformation

KW - Wave buoy analogy

KW - Wave spectrum estimation

KW - Wave-induced vessel responses

U2 - 10.1016/j.marstruc.2018.03.011

DO - 10.1016/j.marstruc.2018.03.011

M3 - Journal article

VL - 60

SP - 101

EP - 121

JO - Marine Structures

JF - Marine Structures

SN - 0951-8339

ER -