The Experts below are selected from a list of 381 Experts worldwide ranked by ideXlab platform
Andreas Manjock - One of the best experts on this subject based on the ideXlab platform.
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A Comparison of Wind Turbine Aeroelastic Codes Used for Certification
44th AIAA Aerospace Sciences Meeting and Exhibit, 2006Co-Authors: Marshall L. Buhl, Andreas ManjockAbstract:The National Renewable Energy Laboratory (NREL) has created aeroelastic simulators for horizontal-axis wind turbines. The U.S. wind energy industry often uses these codes to analyze its turbines, and manufacturers seeking type certification for their turbines need to use codes that certifying agencies will accept. NREL brokered an agreement with Germanischer Lloyd (GL) WindEnergie GmbH, the world's foremost certifying body for wind turbines, to participate in a comparison between its code and two of NREL's codes. Af- ter a variety of exercises, GL issued a statement that it is acceptable for manufacturers to use the NREL codes for on-shore wind turbine certification.
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Comparison of Wind-Turbine Aeroelastic Codes Used for Certification: Preprint
2006Co-Authors: Marshall L. Buhl, Andreas ManjockAbstract:NREL created aeroelastic simulators for horizontal-axis wind turbines accepted by Germanischer Lloyd (GL) WindEnergie GmbH for manufacturers to use for on-shore wind turbine certification.
Takeshi Ishihara - One of the best experts on this subject based on the ideXlab platform.
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Wind tunnel test on mean wind forces and peak pressures acting on wind turbine nacelles
Wind Energy, 2012Co-Authors: Hiroshi Noda, Takeshi IshiharaAbstract:Mean wind force coefficients of nacelles are investigated by a wind tunnel test and are compared with those in current codes, such as the Germanischer Lloyd Guideline 2010 (GL2010) and Eurocode, in order to clarify the effects of the ground, presence of a hub, turbulence in the incident flow and nacelle length on these coefficients. Formulas for the mean wind force coefficients are proposed as a function of yaw angles. It is found that mean wind force coefficients of wind turbine nacelles specified in GL2010 are underestimated in comparison with those obtained by wind tunnel tests. Pressure measurements of a nacelle are also conducted. Notably, the mean pressure coefficients for design load case 6.2 (DLC6.2) are significantly larger than those for design load case 6.1 (DLC6.1) in IEC61400-1. Maximum and minimum mean pressure coefficients are proposed for the DLC6.1 and DLC6.2 by the wind tunnel test, which are similar to those in Eurocode and are larger than those proposed in GL2010. Copyright © 2012 John Wiley & Sons, Ltd.
Arianto, Pratama Yuli - One of the best experts on this subject based on the ideXlab platform.
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Analisis Tegangan Akibat Beban Gelombang pada Struktur Kapal Perang Tipe Corvette
'Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS', 2017Co-Authors: Arianto, Pratama Yuli, Sulisetyono Aries, Putranto TeguhAbstract:Peningkatan sektor pertahanan nasional merupakan suatu hal yang penting dalam mempertahankan kedaulatan suatu negara. Salah satu diantaranya adalah dengan membuat Alat Utama Sistem Pertahanan Negara (ALUTSISTA) berupa kapal perang yang memiliki kecepatan tinggi, maneuver dan kekuatan struktur yang bagus. Ketika terjadi interaksi antara struktur kapal dengan beban gelombang maka akan muncul suatu tegangan. Jika tegangan yang dihasilkan melebihi batas tegangan yang diijinkan maka akan membahayakan dan merusak struktur kapal. Penelitian ini bertujuan untuk mengkaji desain lambung dan kekuatan struktur kapal untuk daerah operasional di perairan terbuka Indonesia yang memiliki tinggi rata-rata gelombang 3-5 m dan menurut standar Germanischer Lloyd (GL) dengan tinggi rata-rata gelombang 6 m. Pembahasan dititikberatkan pada analisis gerakan kapal untuk mengetahui kekuatan struktur kapal akibat adanya beban gelombang. Analisis dilakukan dengan melakukan pemodelan numerik dengan metode panel. Skenario divariasikan berdasarkan sudut hadap 900, 1350, 1800 dan tinggi gelombang signifikan 3, 4, 5 dan 6 m. Dari hasil simulasi didapatkan besar gaya lintang maksimal pada gerakan heaving dan momen lengkung maksimal pada gerakan pitching yang terjadi pada midship section ketika tinggi gelombang 6 m dan sudut hadap 1800. Tegangan terbesar kapal terjadi ketika kondisi sagging dan hogging maksimal yang terletak pada midship section frame 88 sebesar 231,89 N/mm2 dan memenuhi persyaratan tegangan izin berdasarkan GL rules
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ANALISIS TEGANGAN AKIBAT BEBAN GELOMBANG PADA STRUKTUR KAPAL PERANG TIPE COREVETTE
2016Co-Authors: Arianto, Pratama YuliAbstract:Peningkatan sektor pertahanan nasional merupakan suatu hal yang penting dalam mempertahankan kedaulatan suatu negara. Salah satu diantaranya adalah dengan membuat Alat Utama Sistem Pertahanan Negara (ALUTSISTA) berupa kapal perang yang memiliki kecepatan tinggi, maneuver dan kekuatan struktur yang bagus. Ketika terjadi interaksi antara struktur kapal dengan beban gelombang maka akan muncul suatu tegangan. Jika tegangan yang dihasilkan melebihi batas tegangan yang diijinkan maka akan membahayakan dan merusak struktur kapal. Penelitian ini bertujuan untuk mengkaji desain lambung dan kekuatan struktur kapal untuk daerah operasional di perairan Indonesia yang memiliki tinggi rata-rata gelombang 3-5 m dan menurut standar Germanischer Lloyd (GL) dengan tinggi rata-rata gelombang 6 m. Pembahasan dititikberatkan pada analisis gerakan kapal untuk mengetahui kekuatan struktur kapal akibat adanya beban gelombang. Analisis dilakukan dengan melakukan pemodelan numerik dengan metode panel. Skenario divariasikan berdasarkan sudut hadap 900, 1350, 1800 dan tinggi gelombang signifikan 3, 4, 5 dan 6 m. Dari hasil simulasi didapatkan besar gaya lintang maksimal pada gerakan heaving dan momen lengkung maksimal pada gerakan pitching, yang terjadi pada midship section ketika tinggi gelombang 6 m dan sudut hadap 1800. Tegangan terbesar kapal terjadi ketika kondisi sagging dan hogging maksimal yang terletak pada midship section frame 88 sebesar 231,89 N/mm2 dan memenuhi persyaratan tegangan izin berdasarkan GL rules
Pierre Sames - One of the best experts on this subject based on the ideXlab platform.
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Multi-objective optimization of oil tanker design
Journal of Marine Science and Technology, 2010Co-Authors: Apostolos Papanikolaou, George Zaraphonitis, Evangelos Boulougouris, Uwe Langbecker, Sven Matho, Pierre SamesAbstract:Parametric optimization was applied to a double-hull AFRAMAX tanker design in order to reduce oil-outflow probability and increase cargo carrying capacity, and the results are presented here. A multi-criteria optimization procedure was set up in modeFrontier ^® using the cargo volume, the mean oil-outflow parameter and the steel weight of the cargo block as the objective functions. Calculations are based on a parametric geometric model of the ship created in NAPA ^®, and on a structural model created in POSEIDON ^®. Integration of the above software packages leads to an automated optimization procedure that provides improved feedback to the designer regarding the trade-off between the various design parameters and optimization criteria involved. The results obtained suggest notable improvements in transport capacity and oil-outflow performance for known, well-established yard designs. The presented work derives from a joint industrial project between Germanischer Lloyd (GL) and the Ship Design Laboratory of the National Technical University of Athens (NTUA-SDL), which continues the work done and coordinated by NTUA-SDL within the SAFEDOR project on the same subject.
Marshall L. Buhl - One of the best experts on this subject based on the ideXlab platform.
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A Comparison of Wind Turbine Aeroelastic Codes Used for Certification
44th AIAA Aerospace Sciences Meeting and Exhibit, 2006Co-Authors: Marshall L. Buhl, Andreas ManjockAbstract:The National Renewable Energy Laboratory (NREL) has created aeroelastic simulators for horizontal-axis wind turbines. The U.S. wind energy industry often uses these codes to analyze its turbines, and manufacturers seeking type certification for their turbines need to use codes that certifying agencies will accept. NREL brokered an agreement with Germanischer Lloyd (GL) WindEnergie GmbH, the world's foremost certifying body for wind turbines, to participate in a comparison between its code and two of NREL's codes. Af- ter a variety of exercises, GL issued a statement that it is acceptable for manufacturers to use the NREL codes for on-shore wind turbine certification.
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Comparison of Wind-Turbine Aeroelastic Codes Used for Certification: Preprint
2006Co-Authors: Marshall L. Buhl, Andreas ManjockAbstract:NREL created aeroelastic simulators for horizontal-axis wind turbines accepted by Germanischer Lloyd (GL) WindEnergie GmbH for manufacturers to use for on-shore wind turbine certification.