{"title":"Predictive model of wind turbine rotor-blade deflection","authors":"C. Armenta-Déu, Antoine Renoud-Grappin","doi":"10.37591/joost.v8i2.1142","DOIUrl":"https://doi.org/10.37591/joost.v8i2.1142","url":null,"abstract":"A simulation process has been developed to predict wind turbine rotor-blade deflection caused by gravity effects. The model is based on the rotor-blade segmentation in finite elements, each one considered as an independent structure. The simulation has been extended to n-elements to make a more precise approach to the real performance. The range of deformation has been determined for a wind turbine rotor-blade analysing the effects of forces that creates a bending moment and estimating the permanent deformation. Accelerated deformation tests have been run to evaluate the deflection and angular phase shift with time in ranges that can be compared to real situations. The accelerated deformation process has been achieved by a constant load equivalent to 22.5 times the rotor-blade weight. The results have been compared to those obtained from experimental tests in a prototype operating under similar conditions. The results of the comparison have demonstrated the validity of the theory, within 95% accuracy. The high accuracy of the results indicates the simulation process can be applied to bigger wind turbines within a minimum error. The predictive model estimates how the deflection at the blade tip of wind turbine rotors evolves with time; the prediction, for the lifespan of a wind turbine rotor-blade of 25 years, results in deflection from 0.115 m for small wind turbines of 14 m of diameter (50 kW) until 1.315 m for large wind turbines of 114 m of diameter (4.5 MW).","PeriodicalId":331410,"journal":{"name":"Journal of Offshore Structure and Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114137306","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}
{"title":"MODELLING OF WIND-WAVE MISALIGNMENT FOR FLOATING OFFSHORE WIND TURBINES","authors":"C. Armenta-Déu, Nestor Racouchot","doi":"10.37591/joost.v8i2.1144","DOIUrl":"https://doi.org/10.37591/joost.v8i2.1144","url":null,"abstract":"The influence of the combined effects of wind and waves onto the performance of a Floating Off-Shore Wind Turbine (FOWT) is analyzed. A study of the wind conditions relative to the position of the aerodynamic rotor has been made, analyzing how the angle of incidence of the wind (angle of attack) varies with the wind direction and the inclination of the wind turbine mast as a consequence of the undulatory movement of the waves. This analysis should result in a theoretical model based on the variation of the angle of attack which allows the characterization of the turbine under the combined effect of the oscillation of the sea surface and changes in relative wind direction to the aerodynamic rotor. The results obtained from this research will allow designers and operators to properly manage the situation under which the FOWT is working for a cross action of wave movement and wind direction. A proposed method to compensate for the aforementioned changes in the aerodynamics of the turbine rotor is a so-called “pitch and yaw compensation” system that allows eliminating the effect produced by the variation in the angle of attack and, therefore, minimizing the effect of oscillation on the generated power generated.","PeriodicalId":331410,"journal":{"name":"Journal of Offshore Structure and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128814600","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}
{"title":"Research Note on the estimation of unrained bearing capacity of spud can foundation under combination loading","authors":"A. Shukla","doi":"10.37591/joost.v5i3.269","DOIUrl":"https://doi.org/10.37591/joost.v5i3.269","url":null,"abstract":"This research note presents a numerical investigation into the bearing behavior of an embedded spud-can in normally consolidated soil. The numerical model is implemented with ABAQUS *TM . The different embedment depths from shallow to deep are considered in this research note. The numerical model is based upon the ‘small strain finite element (SSFE)’ approach to compute capacity of the installed spud-can. The numerical model allows a systematic estimation of the combined bearing capacity of the embedded spud-can at various depths. In the numerical model the spud-can is considered as a rigid body. In the results, a normal consolidated clay profile and the soil are modeled as linearly elastic and perfectly plastic material. The bearing capacity factors for various embedment depths from shallow to deep for VHM loading for the spud-can foundation of a jack-up rig are presented. The results are also compared with other available results from the literature.","PeriodicalId":331410,"journal":{"name":"Journal of Offshore Structure and Technology","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132632575","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}
Kalyani Manthripragada, Jossia K. Joseph, A. M., Sudhakar Tata
{"title":"Observed Seasonal Variation Of Wave Power From Moored Buoy Measurements - A Case Study On The East Coast of India","authors":"Kalyani Manthripragada, Jossia K. Joseph, A. M., Sudhakar Tata","doi":"10.37591/joost.v10i1.1405","DOIUrl":"https://doi.org/10.37591/joost.v10i1.1405","url":null,"abstract":"","PeriodicalId":331410,"journal":{"name":"Journal of Offshore Structure and Technology","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131526876","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}
{"title":"Analysis of Wind-wave Effect on Short-term FOWT Power Loss","authors":"C. Armenta-Déu, Nestor Racouchot","doi":"10.37591/joost.v8i3.1176","DOIUrl":"https://doi.org/10.37591/joost.v8i3.1176","url":null,"abstract":"","PeriodicalId":331410,"journal":{"name":"Journal of Offshore Structure and Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132084697","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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