Studi Eksperimental Respon Gerakan Heave SPAR Platform menggunakan Tuned Mass Damper dengan Variasi Kekakuan Pegas

Fahrudin, Naufal Ali (2026) Studi Eksperimental Respon Gerakan Heave SPAR Platform menggunakan Tuned Mass Damper dengan Variasi Kekakuan Pegas. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5046221017-Undergraduate_Thesis.pdf Restricted to Repository staff only Download (6MB) | Request a copy

Abstract

Platform SPAR merupakan salah satu struktur terapung yang banyak digunakan pada perairan dalam, namun memiliki kerentanan terhadap respons gerak heave akibat eksitasi gelombang, terutama pada frekuensi mendekati resonansi. Penelitian ini bertujuan menganalisis pengaruh penerapan Tuned Mass Damper (TMD) terhadap reduksi respons heave model SPAR, dengan fokus pada variasi kekakuan pegas TMD. Metode penelitian yang digunakan adalah eksperimen skala laboratorium pada kondisi gelombang terkontrol menggunakan spektrum JONSWAP dengan tinggi gelombang signifikan H_{s}= 2.5 m, periode puncak T_{p}= 7.5 s, dan faktor puncak γ= 2.8 pada skala penuh. Pengujian dilakukan pada model SPAR skala 1:25 di fasilitas flume tank MOB BRIN dengan tiga konfigurasi: tanpa TMD (M0K0), TMD dengan pegas k_{1}(M1K1), dan TMD dengan pegas k_{2}(M1K2). Respons heave dianalisis dalam domain frekuensi menggunakan metode Fast Fourier Transform (FFT) dengan smoothing Hamming window. Hasil penelitian menunjukkan bahwa pemasangan TMD mampu mereduksi respons heave, dengan konfigurasi M1K1 menghasilkan reduksi RMS heave sebesar 3.16% dan amplitudo heave signifikan sebesar 3.16% terhadap konfigurasi tanpa TMD. Konfigurasi M1K2 menghasilkan reduksi yang lebih rendah yaitu 2.87%. Peningkatan kekakuan pegas dari k_{1}ke k_{2}menyebabkan penurunan efektivitas TMD sebesar 9.18%, yang disebabkan oleh pergeseran frekuensi natural TMD menjauhi frekuensi dominan gelombang.
===================================================================================================================================
The SPAR platform is one of the most widely used floating structures in deep water, yet it remains susceptible to heave motion response due to wave excitation, particularly near resonance frequency. This study aims to investigate the effect of a Tuned Mass Damper (TMD) on the reduction of heave response of a SPAR model, with a focus on spring stiffness variation. The research employed a laboratory-scale experimental method under controlled wave conditions using a JONSWAP spectrum with a significant wave height of H_{s}= 2.5 m, peak period T_{p}= 7.5 s, and peak enhancement factor γ= 2.8 at full scale. Experiments were conducted on a 1:25 scale SPAR model at the MOB BRIN flume tank facility, covering three configurations: without TMD (M0K0), TMD with spring stiffness k_{1}(M1K1), and TMD with spring stiffness k_{2}(M1K2). Heave responses were analyzed in the frequency domain using the Fast Fourier Transform (FFT) method with Hamming window smoothing. Results indicate that the TMD installation successfully reduced the heave response, with configuration M1K1 achieving a 3.16% reduction in heave RMS, a 3.16% reduction in significant heave amplitude, and a 6.52% reduction in peak RAO relative to the no-TMD baseline. Configuration M1K2 yielded lower reductions of 2.87% (RMS and significant amplitude) and 5.05% (peak RAO). Increasing spring stiffness from k_{1}to k_{2}caused a 9.18% decrease in TMD effectiveness, attributable to the shift of the TMD natural frequency away from the dominant wave frequency.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	SPAR, heave, Tuned Mass Damper, kekakuan pegas, RAO, eksperimen.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Naufal Ali Fahrudin
Date Deposited:	30 Jul 2026 06:18
Last Modified:	30 Jul 2026 06:18
URI:	http://repository.its.ac.id/id/eprint/139563

Actions (login required)

View Item