Desain Dan Analisis Kinerja Point Absorber Device Pada Fixed Pile Platform Dalam Upaya Pemanfaatan Energi Gelombang Laut

Suprapto, Barizallen Abdullah (2026) Desain Dan Analisis Kinerja Point Absorber Device Pada Fixed Pile Platform Dalam Upaya Pemanfaatan Energi Gelombang Laut. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Wave Energy Converter (WEC) tipe point absorber merupakan perangkat konversi energi gelombang yang memanfaatkan gerakan osilasi floater untuk mengubah energi gelombang menjadi energi mekanik. Studi ini menilai pengaruh variasi bentuk dan ukuran diameter floater terhadap kinerja penyerapan daya dengan skenario integrasi pada struktur kaki anjungan lepas pantai yang akan di-decommissioning, sehingga infrastruktur eksisting dapat dimanfaatkan kembali sebagai platform energi terbarukan. Analisis dilakukan menggunakan simulasi numerik berbasis Boundary Element Method (BEM) untuk memperoleh respons hidrodinamika pada domain frekuensi dan domain waktu, mencakup RAO, added mass, radiation damping, dan force excitation, kecepatan simpangan, serta indikator akhir berupa daya rata-rata (W) dan efisiensi (%). Model tervalidasi terhadap penelitian sebelumnya dan menunjukkan kesesuaian tren serta besaran respons yang memadai untuk mendukung studi parametrik. Variasi yang diuji meliputi tiga bentuk floater (conical, wider cylinder, dan wider trapezoid) serta variasi diameter pada bentuk conical (4 m, 6 m/baseline, dan 8 m) pada arah datang gelombang BBL dan T dan pada variasi Hs dan Tp. Hasil menunjukkan bahwa pada konfigurasi lengan B, variasi bentuk conical paling optimal dengan daya rata-rata sekitar 1009 dan 1234 W dan efisiensi hingga 21.9%, melampaui bentuk lain yang berada di kisaran 586 W dengan efisiensi sekitar 14.9%. Penguatan kinerja paling jelas terjadi pada variasi ukuran, di mana conical diameter 8 m secara konsisten menghasilkan daya rata-rata tertinggi 3798 W (≈2× baseline 6 m dan jauh di atas 4 m) pada seluruh kombinasi arah dan Hs dan Tp, disertai efisiensi rata-rata 30.9% yang juga lebih tinggi daripada baseline maupun 4 m. Dengan demikian, conical 8 m ditetapkan sebagai opsi paling unggul karena memberikan kombinasi daya keluaran tinggi dan efisiensi konversi yang paling baik pada seluruh skenario pengujian.
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A point absorber type Wave Energy Converter (WEC) converts wave energy into mechanical energy by exploiting the oscillatory motion of a floating body. This study investigates the influence of floater geometry and diameter on power absorption performance under an integration scenario on fixed offshore platform legs scheduled for decommissioning, thereby enabling the repurposing of existing infrastructure as a renewable energy platform. The analysis employs Boundary Element Method (BEM) based numerical simulations to obtain hydrodynamic responses in both the frequency and time domains, including RAO, added mass, radiation damping, excitation force, and oscillation velocity, which are subsequently used to derive the key performance indicators: average power output (W) and conversion efficiency (%). The model is validated against prior research and demonstrates adequate agreement in both trends and response magnitudes, supporting its suitability for parametric investigation. The tested configurations comprise three floater shapes (conical, wider cylinder, and wider trapezoid) and conical diameter variations (4 m, 6 m/baseline, and 8 m) under BBL and T wave directions across multiple Hs and Tp conditions. Results indicate that for arm configuration B, the conical floater provides the best overall performance, achieving average power outputs of approximately 1009–1234 W and peak efficiencies up to 21.9%, outperforming the other shapes 586 W and 14.9%. The most pronounced improvement is observed in the diameter study, where the 8 m conical floater consistently yields the highest average power output 3798 W (about twice the 6 m baseline and substantially greater than the 4 m case), together with the highest average efficiency 30.9% across all tested combinations of wave direction, Hs, and Tp. Consequently, the 8 m conical floater is identified as the most favorable option due to its robust and consistently superior power output and conversion efficiency.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Konversi enegi gelombang, single point absorber device, gelombang irreguler, fixed pile platform, boundary element method (BEM). wave energy conversion (WEC), single point-absorber device, irregular waves, fixed-pile platform, boundary element method (BEM).
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power. T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Barizallen Abdullah Suprapto
Date Deposited:	02 Feb 2026 02:02
Last Modified:	02 Feb 2026 02:02
URI:	http://repository.its.ac.id/id/eprint/131185

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