Analisis Pengaruh Penggunaan Multi Chine dan Transversed Step Hull Pada Kapal Cepat Terhadap Seakeeping Kapal Menggunakan Simulasi Numerik

Mubarok, Ghulam (2026) Analisis Pengaruh Penggunaan Multi Chine dan Transversed Step Hull Pada Kapal Cepat Terhadap Seakeeping Kapal Menggunakan Simulasi Numerik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal cepat banyak dipakai karena bisa mempersingkat waktu tempuh, tetapi di laut bergelombang, kapal mudah mengalami gerakan yang mengganggu kenyamanan dan keselamatan. Karena itu, performa seakeeping perlu dianalisis agar bisa diperkirakan seberapa baik kapal tetap stabil dan nyaman pada kondisi gelombang tertentu. Penelitian ini membahas pengaruh perubahan bentuk lambung berupa multi chine (single chine dan multi chine) dan transverse step hull, baik secara mandiri maupun dikombinasikan, terhadap seakeeping model kapal berbasis NPL 4b. Analisis dilakukan secara numerik menggunakan Ansys Aqwa dengan kondisi gelombang acak dengan spektrum JONSWAP pada dua kecepatan, yaitu Fr 0,4 dan Fr 0,8, serta tiga arah datang gelombang (180 deg, 135 deg dan 90 deg). Validasi dilakukan dengan perbandingan trend kurva RAO, nilai puncak dan RMSE pada gerakan heave dan pitch, yang hasil RMSE mendapatkan nilai yang cenderung menjauh dari nilai nol seiring dengan pertambahan kecepatan. Hasil dinilai memakai nilai stokastik RMS untuk gerakan heave, roll, dan pitch. Pada penelitian ini didapatkan hasil dimana penggunaan chine dan step serta kombinasinya secara kuantitatif mampu menurunkan nilai RMS khususnya pada gerak rotational kapal yaitu roll dan pitch, dan mengalami kenaikan pada gerak translational yaitu heave. Pada gerakan pitch konfigurasi terbaik didapatkan pada arah gelombang heading sea didapatkan penurunan RMS pitch paling besar pada model multi chine (N2) untuk Fr 0,4 dan barehull step (NS0) untuk Fr 0,8 dengan nilai RMS pitch sebesar 3,739 derajat dan 3,989 derajat dengan penurunan sebesar 1,8% dan 4,7%. Pada gerakan roll sendiri pada arah gelombang beam sea didapatkan konfigurasi paling optimal pada model kombinasi multi chine dengan step (NS2) baik pada Fr 0,4 atau Fr 0,8 dengan nilai RMS roll sebesar 0,753 derajat dan 0,538 derajat dengan penurunan sebesar 39,2% dan 41,9%.
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High-speed vessels are widely used because they can reduce travel time, but in rough seas, vessels are prone to motion that compromises comfort and safety. Therefore, seakeeping performance must be analyzed to predict how well the vessel remains stable and comfortable under specific wave conditions. This study examines the influence of hull shape modifications, specifically multi-chine (single-chine and double-chine) and transverse-step hulls, both individually and in combination, on the seakeeping performance of an NPL 4b-based ship model. The analysis was conducted numerically using Ansys Aqwa under random wave conditions with a JONSWAP spectrum at two wave numbers, namely Fr 0.4 and Fr 0.8, and three wave arrival directions (180 deg, 135 deg dan 90 deg). Validation was performed by comparing the RAO curve trends, peak values, and RMSE for heave and pitch motions, with the RMSE results showing values that tend to move away from zero as speed increases. The resultswere evaluated using stochastic RMS values for heave, roll, and pitch motions. This study found that the use of chine and step configurations, as well as their combinations, quantitatively reduced RMS values, particularly for the ship’s rotational motions (roll and pitch), while increasing RMS values for translational motion (heave). For pitch motion in the heading-sea wave direction, the best configuration was found in the multi-chine model (N2) for Fr 0.4 and the bare-hull step model (NS0) for Fr 0.8, with RMS pitch values of 3.739 degrees and 3.989 degrees, respectively, representing reductions of 1.8% and 4.7%. For roll motion in the beam sea direction, the most optimal configuration was found in the combined multi-chine with step model (NS2) for both Fr 0.4 and Fr 0.8, with RMS roll values of 0.753 degrees and 0.538 degrees, representing reductions of 39.2% and 41.9%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Boundary Element Method, Gelombang Irregular, Multi Chine , Seakeeping, Step Hull, Boundary Element Method, Irregular Wave, Multi Chine , Seakeeping, Step Hull
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Ghulam Mubarok
Date Deposited:	03 Aug 2026 05:40
Last Modified:	03 Aug 2026 05:40
URI:	http://repository.its.ac.id/id/eprint/142162

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