Application of phase decomposition to the analysis of random time series from wave basin tests

Thomas A.A. Adcock, Xingya Feng, Tianning Tang, Ton S. Van den Bremer, Sandy Day, Saishuai Dai, Ye Li, Zhiliang Lin, Wentao Xu, Paul H. Taylor

Research output: Contribution to conferenceProceeding

Abstract

Many ocean engineering problems involve bound harmonics which are slaved to some underlying assumed close to linear timeseries. When analysing signals we often want to remove the bound harmonics so as to “linearise” the data or to extract individual bound harmonic components so that they may be studied. For even moderately broad banded systems filtering in the frequency domain is not sufficient to separate components as they overlap in frequency. One way to overcome this difficulty is to use input signals with the same linear envelope but with different phases and then use simple addition and subtraction of the resulting signals to extract different harmonics. This approach has been established for the analysis of wave groups. In this paper we examine whether this approach can be used on random time series as well. We analyse random wave time series of wave elevation from the towing tank in Shanghai Jiao Tong University and force measurements on a cylinder taken in the Kelvin tank at the University of Strathclyde.

Conference

ConferenceASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19

Fingerprint

Time series
Decomposition
Ship model tanks
Ocean engineering
Force measurement

Keywords

  • ocean waves
  • bound harmonics
  • wave records
  • perturbation expansion

Cite this

Adcock, T. A. A., Feng, X., Tang, T., Bremer, T. S. V. D., Day, S., Dai, S., ... Taylor, P. H. (2019). Application of phase decomposition to the analysis of random time series from wave basin tests. ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom.
Adcock, Thomas A.A. ; Feng, Xingya ; Tang, Tianning ; Bremer, Ton S. Van den ; Day, Sandy ; Dai, Saishuai ; Li, Ye ; Lin, Zhiliang ; Xu, Wentao ; Taylor, Paul H. / Application of phase decomposition to the analysis of random time series from wave basin tests. ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom.
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abstract = "Many ocean engineering problems involve bound harmonics which are slaved to some underlying assumed close to linear timeseries. When analysing signals we often want to remove the bound harmonics so as to “linearise” the data or to extract individual bound harmonic components so that they may be studied. For even moderately broad banded systems filtering in the frequency domain is not sufficient to separate components as they overlap in frequency. One way to overcome this difficulty is to use input signals with the same linear envelope but with different phases and then use simple addition and subtraction of the resulting signals to extract different harmonics. This approach has been established for the analysis of wave groups. In this paper we examine whether this approach can be used on random time series as well. We analyse random wave time series of wave elevation from the towing tank in Shanghai Jiao Tong University and force measurements on a cylinder taken in the Kelvin tank at the University of Strathclyde.",
keywords = "ocean waves, bound harmonics, wave records, perturbation expansion",
author = "Adcock, {Thomas A.A.} and Xingya Feng and Tianning Tang and Bremer, {Ton S. Van den} and Sandy Day and Saishuai Dai and Ye Li and Zhiliang Lin and Wentao Xu and Taylor, {Paul H.}",
year = "2019",
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note = "ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 ; Conference date: 09-06-2019 Through 14-06-2019",

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Adcock, TAA, Feng, X, Tang, T, Bremer, TSVD, Day, S, Dai, S, Li, Y, Lin, Z, Xu, W & Taylor, PH 2019, 'Application of phase decomposition to the analysis of random time series from wave basin tests' ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom, 9/06/19 - 14/06/19, .

Application of phase decomposition to the analysis of random time series from wave basin tests. / Adcock, Thomas A.A.; Feng, Xingya; Tang, Tianning; Bremer, Ton S. Van den; Day, Sandy; Dai, Saishuai; Li, Ye; Lin, Zhiliang; Xu, Wentao; Taylor, Paul H.

2019. ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom.

Research output: Contribution to conferenceProceeding

TY - CONF

T1 - Application of phase decomposition to the analysis of random time series from wave basin tests

AU - Adcock, Thomas A.A.

AU - Feng, Xingya

AU - Tang, Tianning

AU - Bremer, Ton S. Van den

AU - Day, Sandy

AU - Dai, Saishuai

AU - Li, Ye

AU - Lin, Zhiliang

AU - Xu, Wentao

AU - Taylor, Paul H.

PY - 2019/6/9

Y1 - 2019/6/9

N2 - Many ocean engineering problems involve bound harmonics which are slaved to some underlying assumed close to linear timeseries. When analysing signals we often want to remove the bound harmonics so as to “linearise” the data or to extract individual bound harmonic components so that they may be studied. For even moderately broad banded systems filtering in the frequency domain is not sufficient to separate components as they overlap in frequency. One way to overcome this difficulty is to use input signals with the same linear envelope but with different phases and then use simple addition and subtraction of the resulting signals to extract different harmonics. This approach has been established for the analysis of wave groups. In this paper we examine whether this approach can be used on random time series as well. We analyse random wave time series of wave elevation from the towing tank in Shanghai Jiao Tong University and force measurements on a cylinder taken in the Kelvin tank at the University of Strathclyde.

AB - Many ocean engineering problems involve bound harmonics which are slaved to some underlying assumed close to linear timeseries. When analysing signals we often want to remove the bound harmonics so as to “linearise” the data or to extract individual bound harmonic components so that they may be studied. For even moderately broad banded systems filtering in the frequency domain is not sufficient to separate components as they overlap in frequency. One way to overcome this difficulty is to use input signals with the same linear envelope but with different phases and then use simple addition and subtraction of the resulting signals to extract different harmonics. This approach has been established for the analysis of wave groups. In this paper we examine whether this approach can be used on random time series as well. We analyse random wave time series of wave elevation from the towing tank in Shanghai Jiao Tong University and force measurements on a cylinder taken in the Kelvin tank at the University of Strathclyde.

KW - ocean waves

KW - bound harmonics

KW - wave records

KW - perturbation expansion

M3 - Proceeding

ER -

Adcock TAA, Feng X, Tang T, Bremer TSVD, Day S, Dai S et al. Application of phase decomposition to the analysis of random time series from wave basin tests. 2019. ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom.