Studi Gerakan Heave Pada SPAR Tipe Klasik Terhadap Penambahan Tuned Mass Damper Tipe Peredam Massa Pegas

Reza, Luqman Fahru (2025) Studi Gerakan Heave Pada SPAR Tipe Klasik Terhadap Penambahan Tuned Mass Damper Tipe Peredam Massa Pegas. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

SPAR tipe klasik memiliki periode natural heave dalam rentang 25–30 detik, sehingga berisiko mengalami resonansi saat periode gelombang mendekati nilai tersebut. Oleh karena itu, diperlukan metode untuk mengurangi efek resonansi gerakan heave. Penelitian ini bertujuan untuk menganalisis pengaruh Tuned Mass Damper (TMD) tipe peredam massa pegas terhadap respons gerakan heave pada SPAR tipe klasik. Simulasi dilakukan menggunakan metode numerik berbasis domain frekuensi dengan perangkat lunak Nemoh untuk mendapatkan Response Amplitude Operator (RAO) gerakan heave. Parameter yang ditinjau meliputi rasio massa TMD terhadap displacement (∆) SPAR, koefisien kekakuan pegas TMD, dan koefisien peredam TMD. Hasil perhitungan menunjukkan bahwa variasi parameter TMD memengaruhi bentuk kurva RAO, baik dari ketinggian puncak resonansi, kemunculan puncak resonansi baru, maupun pergeseran frekuensi puncak resonansi. Dari seluruh Variasi yang diujikan, TMD dapat meredam puncak resonansi struktur SPAR secara signifikan, didapat RAO maksimum terendah 1.536 (m/m) bila dibanding tanpa TMD, 2.216 (m/m). Pada perhitungan respons spektral untuk kondisi gelombang baik 1 tahunan maupun 100 tahunan di daerah West Seno, TMD tidak memberikan pengaruh signifikan karena ketidaksesuaian antara frekuensi kritis RAO struktur dan distribusi energi spektrum gelombang.
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A classic type SPAR has a natural heave period in the range of 25–30 seconds, making it susceptible to resonance when the wave period approaches this range. Therefore, a method is needed to reduce the resonance effects of the heave motion. This study aims to analyze the effect of a spring-mass type Tuned Mass Damper (TMD) on the heave motion response of a classic-type SPAR. The simulation was carried out using a frequency-domain numerical method with the Nemoh software to obtain the heave Response Amplitude Operator (RAO). The parameters considered include the TMD mass ratio to the SPAR displacement (∆), the TMD spring stiffness coefficient, and the TMD damping coefficient. The results show that variations in TMD parameters influence the shape of the RAO curve, including the height of the resonance peak, the appearance of new resonance peaks, and the shift of the resonance peak frequency. Among all tested variations, the TMD was able to significantly suppress the resonance peak of the SPAR structure, with the lowest maximum RAO obtained being 1.536 (m/m) compared to 2.216 (m/m) without TMD. However, in the spectral response calculations under both 1-year and 100-year wave conditions in the West Seno region, the TMD showed no significant effect due to the mismatch between the structure’s critical RAO frequency and the wave energy spectrum distribution.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	SPAR, RAO Heave, Tuned mass damper, Peredam massa pegas, Respons Spektra,SPAR, Heave RAO, Tuned Mass Damper, Spring-Mass Damper, Spectral Response.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Luqman Fahru Reza
Date Deposited:	27 Jul 2025 09:01
Last Modified:	27 Jul 2025 09:01
URI:	http://repository.its.ac.id/id/eprint/122089

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