Optimasi Desain Substruktur DeepCWind Floating Offshore Wind Turbine dengan Metode Deterministic Design Optimization

Darisman, Hudzwah Azzahrawani (2024) Optimasi Desain Substruktur DeepCWind Floating Offshore Wind Turbine dengan Metode Deterministic Design Optimization. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Potensi energi angin (bayu) di Indonesia memiliki prospek yang baik, utamanya di daerah lepas pantai. Perairan Arafura adalah salah satu area yang memiliki kecepatan angin hingga 15 m/s di ketinggian 100 meter, sehingga rencana instalasi turbin angin dapat dipertimbangkan. Beberapa literatur telah mengkaji berbagai performa jenis substruktur dari turbin angin yang sesuai dengan perairan di Indonesia, dengan desain performa terbaik dimiliki oleh DeepCWind semisubmersible. Akan tetapi, substruktur ini dianggap overdesign karena perancangannya menyesuaikan dengan beban lingkungan di Laut Amerika yang memiliki kondisi lingkungan yang ekstrem. Maka dari itu, studi terkait optimalisasi substruktur sesuai dengan Perairan Indonesia perlu dilakukan. Proses optimasi berfokus pada penurunan berat dengan meminimumkan cross-sectional properties member dengan memenuhi beberapa kendala. Optimasi menggunakan surrogate model sebagai fungsi eksplisit kendala yang dibentuk oleh data eksperimen. Desain eksperimen yang digunakan untuk membangun surrogate model berjumlah 120 desain, berdasarkan variasi ukuran desain variabel yang dibuat dengan teknik sampling Latin Hypercube Sampling yang merepresentasi ruang dimensi variabel secara keseluruhan. Simulasi dilakukan di software OpenFAST dari National Renewable Energy Laboratory untuk analisis aero-hydro-servo-elastic setiap desain eksperimennya. Selanjutnya, respons struktur maksimum menjadi input bagi pembentukan surrogate model berdasarkan metode Kriging. Model surrogate yang memiliki ukuran statistik R2 di atas 0.9 dapat dikatakan valid sehingga proses optimasi dapat dilanjutkan. Desain optimum memiliki reduksi berat hingga 71% dari desain awal, dengan performa yang berada di bawah batas kendala.
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Indonesia has good prospects of wind energy, especially in Arafura Sea. Several literatures have reviewed the performance of various types of wind turbine substructures that are suitable for Indonesian Seas, with the best performance design being the DeepCWind semisubmersible. However, this substructure is considered overdesigned because its design is adjusted to the environment in the American Sea which has extreme environmental conditions. Therefore, a study related to substructure optimization according to environment of Indonesian Seas needs to be carried out. The optimization process focuses on reducing weight by minimizing the cross-sectional properties of members by meeting several constraints. The design of experiments used to build the surrogate model consisted of 120 designs, based on variations created by the Latin Hypercube Sampling technique which represents the overall dimension space of variable design. Simulations are carried out in OpenFAST for aero-hydro-servo-elastic analysis of each design of experiments. Furthermore, the maximum structural responses of each design of experiments are created to construct the surrogate model based on the Kriging method. The surrogate models have R2 above 0.9, so that the surrogate models are valid. Based on optimization with sequential quadratic programming (SQP) as the solver, the optimum design has a weight reduction of 71% from the initial design, with performance below the constraint limit.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Optimasi, Deterministic Design Optimization, Floating Offshore Wind Turbine, Semisubmersible, Surrogate Model, Optimization, Deterministic Design Optimization, Floating Offshore Wind Turbine, Semisubmersible, Surrogate Model
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TC Hydraulic engineering. Ocean engineering > TC363 Floating harbors. Including floating docks, piers, etc
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Hudzwah Azzahrawani D
Date Deposited:	31 Jul 2024 07:54
Last Modified:	31 Jul 2024 07:54
URI:	http://repository.its.ac.id/id/eprint/109732

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