Pub Date : 2023-05-13DOI: 10.23967/marine.2023.119
Shahroz Khan, S. Gaggero, P. Kaklis, G. Vernengo, D. Villa
Simulation-driven shape optimisation (SDSO) of marine propellers is often obstructed by high-dimensional design spaces stemming from its complex geometry and baseline parameterisation, which leads to the notorious curse of dimensionality. In this study, we propose using the shape-supervised dimension reduction (SSDR) approach to expedite the SDSO of marine propellers by extracting latent features for a lower-dimensional subspace. SSDR is different from other dimension reduction approaches as it utilises a shape-signature vector function, which consists of a shape modification function and geometric moments, maximising the retained geometric and physical information in the subspace. The resulting shape-supervised subspace from SSDR enables us to efficiently and effectively find an optimal design in appropriate areas of the design space. The feasibility of the proposed method is tested for the E779A propeller parameterised with 40 design parameters with the objective to maximise efficiency while reducing suction side cavitation. The results demonstrate that the shape-supervised subspace achieved an 87.5% reduction in the original design space's dimensionality, resulting in faster optimisation convergence.
{"title":"Accelerating simulation-driven optimisation of marine propellers using shape-supervised dimension reduction","authors":"Shahroz Khan, S. Gaggero, P. Kaklis, G. Vernengo, D. Villa","doi":"10.23967/marine.2023.119","DOIUrl":"https://doi.org/10.23967/marine.2023.119","url":null,"abstract":"Simulation-driven shape optimisation (SDSO) of marine propellers is often obstructed by high-dimensional design spaces stemming from its complex geometry and baseline parameterisation, which leads to the notorious curse of dimensionality. In this study, we propose using the shape-supervised dimension reduction (SSDR) approach to expedite the SDSO of marine propellers by extracting latent features for a lower-dimensional subspace. SSDR is different from other dimension reduction approaches as it utilises a shape-signature vector function, which consists of a shape modification function and geometric moments, maximising the retained geometric and physical information in the subspace. The resulting shape-supervised subspace from SSDR enables us to efficiently and effectively find an optimal design in appropriate areas of the design space. The feasibility of the proposed method is tested for the E779A propeller parameterised with 40 design parameters with the objective to maximise efficiency while reducing suction side cavitation. The results demonstrate that the shape-supervised subspace achieved an 87.5% reduction in the original design space's dimensionality, resulting in faster optimisation convergence.","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125389872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.20944/preprints202110.0252.v1
P. Schmitt, C. Gillan, C. Finnegan
Experimental test facilities are generally characterised using linear transfer functions to relate the wavemaker forcing amplitude to wave elevation at a probe located in the wavetank. Second and third order correction methods are becoming available but are limited to certain ranges of waves in their applicability. Artificial intelligence has been shown to be a suitable tool to find even highly nonlinear functional relationships. This paper reports on a numerical wavetank implemented using the OpenFOAM software package which is characterised using artificial intelligence. The aim of the research is to train neural networks to represent non-linear transfer functions mapping a desired surface-elevation time-trace at a probe to the wavemaker input required to create it. These first results already demonstrate the viability of the approach and the suitability of a single setup to find solutions over a wide range of sea states and wave characteristics.
{"title":"On the Use of Artificial Intelligence to Define Tank Transfer Functions","authors":"P. Schmitt, C. Gillan, C. Finnegan","doi":"10.20944/preprints202110.0252.v1","DOIUrl":"https://doi.org/10.20944/preprints202110.0252.v1","url":null,"abstract":"Experimental test facilities are generally characterised using linear transfer functions to relate the wavemaker forcing amplitude to wave elevation at a probe located in the wavetank. Second and third order correction methods are becoming available but are limited to certain ranges of waves in their applicability. Artificial intelligence has been shown to be a suitable tool to find even highly nonlinear functional relationships. This paper reports on a numerical wavetank implemented using the OpenFOAM software package which is characterised using artificial intelligence. The aim of the research is to train neural networks to represent non-linear transfer functions mapping a desired surface-elevation time-trace at a probe to the wavemaker input required to create it. These first results already demonstrate the viability of the approach and the suitability of a single setup to find solutions over a wide range of sea states and wave characteristics.","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134151169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.092
H. Tang, R. Yang, H. Yao
{"title":"Dynamic Response of a Net Cage Induced by a Sudden Mooring Line Failure in Regular Waves and Currents","authors":"H. Tang, R. Yang, H. Yao","doi":"10.23967/marine.2023.092","DOIUrl":"https://doi.org/10.23967/marine.2023.092","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127218939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.099
D. Märtins, D. Schuster, C. Hente, C. Gebhardt, R. Rolfes
{"title":"Modelling of the Soil-Structure Interaction for Large Offshore Wind Turbines in a New Finite Element Simulation Framework","authors":"D. Märtins, D. Schuster, C. Hente, C. Gebhardt, R. Rolfes","doi":"10.23967/marine.2023.099","DOIUrl":"https://doi.org/10.23967/marine.2023.099","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127352462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.071
T. Lopez-Olocco, L. González Gutiérrez, K. Thiagarajan
{"title":"Hybrid Mooring Systems for a Spar FOWT under regular waves: a numerical and experimental study","authors":"T. Lopez-Olocco, L. González Gutiérrez, K. Thiagarajan","doi":"10.23967/marine.2023.071","DOIUrl":"https://doi.org/10.23967/marine.2023.071","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127522037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.072
A. Lamei, M. Hayatdovoodi, M. Riggs, R. Ertekin
{"title":"Coupled wave, current and wind loads on floating elastic offshore wind turbines","authors":"A. Lamei, M. Hayatdovoodi, M. Riggs, R. Ertekin","doi":"10.23967/marine.2023.072","DOIUrl":"https://doi.org/10.23967/marine.2023.072","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126029105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.135
R. de Winter
{"title":"Parallel Constrained Multi-Objective Optimization for Ship Design Damage Stability Problem with (In)Expensive Function Evaluations","authors":"R. de Winter","doi":"10.23967/marine.2023.135","DOIUrl":"https://doi.org/10.23967/marine.2023.135","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123239433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.019
P. Schmitt
{"title":"Steps Towards the Direct Simulation of Submerged Canopy Flows","authors":"P. Schmitt","doi":"10.23967/marine.2023.019","DOIUrl":"https://doi.org/10.23967/marine.2023.019","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116079628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.080
J. Monty, N. Hutchins, J. Will, I. Aliman, B. Nugroho, I. Utama, I. Suastika, H. Henriyadi, T. Mulia
{"title":"Improved methodology for estimating the drag penalty due to hull roughness: Part II Preliminary results from field and laboratory campaigns","authors":"J. Monty, N. Hutchins, J. Will, I. Aliman, B. Nugroho, I. Utama, I. Suastika, H. Henriyadi, T. Mulia","doi":"10.23967/marine.2023.080","DOIUrl":"https://doi.org/10.23967/marine.2023.080","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124767284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/marine.2023.132
G. Grigoropoulos, C. Bakirztzoglou
{"title":"Robust Optimization Of Hull Forms Operating in Realistic Ocean Environment - An Overview","authors":"G. Grigoropoulos, C. Bakirztzoglou","doi":"10.23967/marine.2023.132","DOIUrl":"https://doi.org/10.23967/marine.2023.132","url":null,"abstract":"","PeriodicalId":198279,"journal":{"name":"10th Conference on Computational Methods in Marine Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129669022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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