Pratama, Alif Kurnia (2026) Analisis Keandalan Inward Battered Guide Structure Sebagai Penopang Turbin Angin Lepas Pantai Dengan Variasi Sudut Puntir: Studi Kasus Perairan Kepulauan Selayar. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Inward Battered Guide Structure (IBGS) merupakan salah satu inovasi struktur penopang turbin angin lepas pantai yang memiliki konfigurasi kaki miring ke arah dalam dengan sudut puntir tertentu. Meskipun menawarkan efisiensi konstruksi dan material, kajian mengenai pengaruh variasi sudut puntir terhadap keandalan struktur masih terbatas. Penelitian ini bertujuan untuk menganalisis integritas struktural dan keandalan IBGS dengan variasi sudut puntir 0°, 30°, 60°, dan 90° pada kondisi operasi di Perairan Kepulauan Selayar, Sulawesi Selatan. Analisis dilakukan dengan mensimulasikan respons turbin NREL 5 MW menggunakan OpenFAST dan menerapkan beban yang dihasilkan pada model struktur IBGS di SACS melalui analisis statis inplace. Untuk mempercepat analisis keandalan, dibangun surrogate model berbasis response surface methodology, kemudian dilakukan simulasi Monte Carlo dengan mempertimbangkan ketidakpastian kecepatan angin dan tegangan luluh material. Hasil analisis menunjukkan bahwa seluruh variasi struktur memenuhi kriteria integritas struktural pada kondisi operasi dengan nilai unity check tertinggi 0,455 dengan member kritis yang berbeda-beda. Sedangkan nilai probabilitas keandalan yang diperoleh berturut-turut adalah 99,85%; 99,79%; 99,60%; dan 99,22% untuk struktur TJ0, TJ30, TJ60, dan TJ90. Indeks keandalan yang dihasilkan masing-masing sebesar 2,995; 2,864; 3,073; dan 2,420. Hasil penelitian menunjukkan bahwa variasi sudut puntir memberikan pengaruh terhadap integritas struktural, lokasi member kritis, dan tingkat keandalan IBGS.
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The Inward Battered Guide Structure (IBGS) is an innovative support structure for offshore wind turbines characterized by inward-inclined legs with a specific twist angle configuration. Although this structural concept offers advantages in terms of construction and material efficiency, studies investigating the effect of twist angle variation on structural reliability remain limited. This study aims to evaluate the structural integrity and reliability of IBGS with twist angles of 0°, 30°, 60°, and 90° under operational conditions in the Selayar Islands waters, South Sulawesi. The analysis was conducted by simulating the response of the NREL 5 MW wind turbine using OpenFAST and applying the resulting loads to the IBGS structural model in SACS through in-place static analysis. To accelerate the reliability assessment, a surrogate model based on Response Surface Methodology (RSM) was developed, followed by Monte Carlo simulations considering uncertainties in wind speed and material yield strength. The results indicate that all structural configurations satisfy the structural integrity criteria under operational conditions, with the highest unity check value of 0.455 and different critical members for each configuration. The corresponding reliability probabilities for TJ0, TJ30, TJ60, and TJ90 are 99.85%, 99.79%, 99.60%, and 99.22%, respectively, while the corresponding reliability indices are 2.995, 2.864, 3.073, and 2.420. The findings indicate that variations in twist angle influence the structural integrity, critical member location, and reliability level of the IBGS.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Inward Battered Guide Structure, turbin angin lepas pantai, keandalan struktur, response surface methodology, simulasi Monte Carlo, offshore wind turbine, structural reliability, response surface methodology, Monte Carlo simulation |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Alif Kurnia Pratama |
| Date Deposited: | 20 Jul 2026 07:25 |
| Last Modified: | 20 Jul 2026 07:25 |
| URI: | http://repository.its.ac.id/id/eprint/135719 |
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