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Analisa Tekuk Pada Kapal FERRY RO-RO Wulandari, Amalia Ika; Nurmawati, Nurmawati; Dianiswara, Anggoronadhi
Wave: Jurnal Ilmiah Teknologi Maritim Vol 13, No 1 (2019)
Publisher : Wave: Jurnal Ilmiah Teknologi Maritim

Para perancang struktur kapal dapat menentukan jarak gading yang optimal dengan batasan resiko tekuk pada pelat. Penelitian ini dilakukan untuk mengetahui beban batas lateral pada masing-masing jarak gading sehingga dapat diketahui resiko tekuk yang terjadi pada pelat. Tekuk adalah suatu ragam kegagalan yang diakibatkan oleh ketidakstabilan suatu elemen struktur yang diepengaruhi oleh aksi beban. Kegagalan yang diakibatkan oleh ketidakstabilan dapat terjadi pada berbagai material. Pada saat tekuk terjadi, taraf gaya internal dapat sangat rendah. Fenomena tekuk berkaitan dengan kekakuan elemen struktur. Kekuatan tekuk pada setiap bagian struktur dapat dievalusi dengan menggunakan konsep tegangan tekuk kritis. Besarnya tegangan tekuk kritis berhubungan dengan persamaan klasik tekuk Euler dan bergantung pada apakah tekuk ini terjadi pada kondisi elastis dan tidak elastis. Penurunan beban berbanding terbalik dengan kenaikan jarak gading,semakin jauh jarak gading maka semakin kecil beban yang dibutuhkan agar pelat mengalami tekuk.

ANALISA TEKUK PADA KAPAL FERRY RO-RO Wulandari, Amalia Ika; Nurmawati, Nurmawati; Dianiswara, Anggoronadhi
Wave: Jurnal Ilmiah Teknologi Maritim Vol 13, No 1 (2019)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Para perancang struktur kapal dapat menentukan jarak gading yang optimal dengan batasan resiko tekuk pada pelat. Penelitian ini dilakukan untuk mengetahui beban batas lateral pada masing-masing jarak gading sehingga dapat diketahui resiko tekuk yang terjadi pada pelat. Tekuk adalah suatu ragam kegagalan yang diakibatkan oleh ketidakstabilan suatu elemen struktur yang diepengaruhi oleh aksi beban. Kegagalan yang diakibatkan oleh ketidakstabilan dapat terjadi pada berbagai material. Pada saat tekuk terjadi, taraf gaya internal dapat sangat rendah. Fenomena tekuk berkaitan dengan kekakuan elemen struktur. Kekuatan tekuk pada setiap bagian struktur dapat dievalusi dengan menggunakan konsep tegangan tekuk kritis. Besarnya tegangan tekuk kritis berhubungan dengan persamaan klasik tekuk Euler dan bergantung pada apakah tekuk ini terjadi pada kondisi elastis dan tidak elastis. Penurunan beban berbanding terbalik dengan kenaikan jarak gading,semakin jauh jarak gading maka semakin kecil beban yang dibutuhkan agar pelat mengalami tekuk.

Fatigue Analysis of 5000 GT Ferry Ro-Roâ€™s Car Deck Using Finite Element Method Wulandari, Amalia Ika; Rahmasari, Nindy widia Devi; Adnyani, Luh Putri; ,, Alamsyah; Ikhwani, Rodlian Jamal
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i3.39268

Ro-Ro Passenger Ship type crossing ship is a ship that is operated to connect 2 (two) ports. On the Ro-Ro ship there is a car deck as one of the vital construction structures, because it is used to support the vehicle load on it. This study aims to determine the value of fatigue life in car deck construction by reviewingÂ hot spotÂ stress areas that are prone to cracking. The value of the fatigue analysis is taken from the greatest stress value and the shortest cycle is taken at each plate thickness variation. The method used is the finite element method (FEM) by varying the thickness of the car deck plate assisted by using finite element based software. The results showed the highest maximum stress was found on car deck 1 with a thickness of 80% (9.6 mm) which was 241.16 Mpa, while the lowest minimum stress was found on car deck 2 with a thickness of 110% (13 mm) which was 103.07 Mpa. The highest value of fatigue life is found in car deck 2 with a plate thickness of 110% (13 mm) of 74.23 years with a stress cycle of 1350000 times, while the lowest fatigue life value is found in car deck 1 with a plate thickness of 80% (9.6 mm)Â of 7.63 years with a voltage cycle of 220000 times

Getaran Torsional Sistem Propulsi Kapal Tug Boat alamsyah, Alamsyah; Hapsari, Dessy Purwita; Wulandari, Amalia Ika; Setiawan, Wira; Pawara, Muhammad Uswah
Jurnal Penelitian Enjiniring Vol 25 No 2 (2021)
Publisher : Center of Techonolgy (COT), Fakultas Teknik, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jpe.112021.04

The Torsional Vibration of Propulsion System of the Tug Boat Ship. Vibrations that occur in the ship's propulsion system can cause reduced operating capability and cause damage to the ship's components, one of the vibrations that occur in the ship's propulsion system is torsional vibration. The purpose of this study was to determine the value of torque oscillations in Tugboat Ship propulsion systems and to find out the value of noise radiation following ICES 209 standard with variations of ST 60 steel material, stainless steel, and carbon steel, using analitical methods. The results obtained by the torque oscillation value of the propulsion system from Tugboat Ship BPW 3 with the variation of ST 60 steel material is 0.0004854, while for carbon steel material, the torque oscillation value is 0.0004690 and the propulsion system that uses stainless steel material variation is 0.0004527. The level of noise radiation (SL) that occurs in propulsion systems using variations of ST 60 steel material is 133.22 dB, while for carbon steel material is 133.23 dB and for stainless steel material is 133.25 dB, of the three noise radiation values (SL ) produced, is still included in the ICES 209 noise level standard.

Perancangan Trash Skimmer Boat pada Sungai Karang Mumus Kota Samarinda Setiawan, Wira; Wulandari, Amalia Ika; Renaldy, Muhammad Rafi
Jurnal Penelitian Enjiniring Vol 25 No 2 (2021)
Publisher : Center of Techonolgy (COT), Fakultas Teknik, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jpe.112021.06

Menurut data Dinas Lingkungan Hidup Kota Samarinda pada tahun 2020, sampah yang dihasilkan di kota tepian tersebut mencapai 610 ton dalam sehari. Salah satu Sungai yang terdampak sampah di Kota Samarinda adalah Sungai Karang Mumus. Salah satu solusi untuk mengatasi permasalahan sampah pada sungai tersebut adalah dengan bantuan Trash Skimmer Boat. Kapal ini memiliki jenis lambung monohull dengan ukuran utama sebesar LOA=10 m, B=3 m, H=1 m, T=0.5 m dan dengan kecepatan 4 knots. Proses pengangkutan sampah dilakukan dengan menggunakan bantuan conveyor dengan daya penggerak 3.44 kW. Kapal pengangkut sampah dilengkapi dengan tempat penampungan sampah dengan kapasitas 3,5 ton yang dilengkapi dengan jaring. Adapun rute pembersihan sampah yang dilakukan dari muara Sungai Karang Mumus hingga Sungai yang berada pada jalan Dr. Sutomo dengan jalur pembersihan sepanjang 4.1 km. Adapun tempat pembuangan sampah darat tetap direncanakan sesuai kondisi eksisting yang ditempatkkan pada tepian di jalan jelawat Kota Samarinda

Impact of Hull Breadth Modification on Tugboat Resistance: A Comparative Analysis Using Holtrop and CFD Methods As’ad, Miftachus Surur; Pawara, Muhammad Uswah; Ikhwani, Rodlian Jamal; Wulandari, Amalia Ika
Indonesian Journal of Maritime Technology Vol. 2 No. 1 (2024): Volume 2 Issue 1, June 2024
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v2i1.1062

Estimating resistance experienced by a ship is crucial for determining the required engine power and fuel consumption to maintain a required speed. This study examines the comparative effects of altering the breadth of a tugboat from the approved initial design of 9 meters to a modified design of 8.6 meters, both utilizing the same engine power of 2x1018 HP. The analysis employs the Holtrop method, and Computational Fluid Dynamics (CFD). Using the Holtrop method, the largest differences at a speed of 14 knots were found to be 11.577 kN in resistance, 198.66 HP in engine power, and 0.617 g/kW.h in Specific Fuel Oil Consumption (SFOC), corresponding to a 5.141% difference in engine load. CFD results indicated the largest differences at 10 knots, with 9.009 kN in resistance, 102.47 HP in engine power, and 3.192 g/kW.h in SFOC, translating to a 5.034% difference in engine load. The modification of the breadth by 0.4 meters, while keeping the engine constant, impacts the resistance, engine power, and fuel consumption of the vessels.

Pengaruh Variasi Sudut Bow Flare terhadap Olah Gerak Kapal Bulk Carrier 44000 DWT Setiawan, Wira; Wulandari, Amalia Ika; Nugroho, Muhammad Cahyo
Jurnal Riset & Teknologi Terapan Kemaritiman Vol. 1 No. 1 (2022)
Publisher : Departemen Teknik Sistem Perkapalan, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jrt2k.062022.02

Kemampuan kapal untuk dapat bertahan dalam kondisi ekstrim di laut membutuhkan perancangan kapal yang baik dengan memperhatikan parameter ukuran utama dan bentuk lambung. Memodifikasi bentuk lambung merupakan salah satu hal yang dapat dilakukan untuk menghasilkan olah gerak kapal yang baik untuk menjamin kenyamanan dan keselamatan kru maupun penumpang. Penelitian ini membahas tentang pengaruh sudut bow flare terhadap respon heave dan pitch serta probabilitas deck wetness dan bottom slamming pada kapal bulk carrier 44000 DWT dengan memvariasikan tinggi dan sudut datang gelombang. Metode yang digunakan adalah komputasi numerik dengan bantuan software Maxsurf dan Ansys Aqwa. Berdasarkan hasil simulasi pada gelombang quartering sea dengan ketinggian 4 meter, pitch dan heave yang dihasilkan pada sudut bow flare 30° adalah sebesar 6.63° dan 1.14 meter, sedangkan pada gelombang head sea dengan ketinggian 4 meter, pitch dan heave yang dihasilkan pada sudut bow flare 30° adalah sebesar 5.96° dan 1.04 meter. Respon gerak tersebut merupakan yang terendah dibandingkan dengan variasi sudut bow flare lainnya. Keunggulan bow flare yang besar juga ditunjukkan pada probabilitas deck wetness dan bottom slamming sehingga dapat disimpulkan bahwa semakin besar sudut bow flare, maka respon gerak kapal akan semakin baik dan begitu pula sebaliknya.

Seakeeping Performance and Passenger Comfort Assessment of a 300 GT Ro-Ro Ferry Using RAO, MSI, and MII Analyses Wahidah, Jusma; Ariani, Vidya Rezeki; Alamsyah; Wulandari, Amalia Ika; Suwedy, Wardina; Sitorus, Chris Jeremy Verian; Hariyono; Kustiwansa, Harlian; Agusty, Cindy Lionita; Syam, Muhammad Anjas
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 3, November 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar

This study examines the motion response and onboard comfort of a Ro-Ro ferry under varying wave directions and speeds using the Response Amplitude Operator (RAO), Motion Sickness Incidence (MSI), and motion-induced interruptions (MII) as evaluation parameters. Simulations were conducted using Maxsurf Motion software with wave heights of 3 m and 3.5 m and encounter angles of 0° (following seas), 90° (beam seas), and 180° (head seas) at vessel speeds of 0 and 12 knots. The MSI was assessed using both simulation results and empirical calculations, whereas the MII was evaluated according to the ISO 2631 standards at three onboard locations: the passenger, navigation, and vehicle decks. The RAO results indicate that the vessel met the NORDFORSK (1987) motion criteria under following and head seas but exceeded the roll limits in beam seas. The MSI values remained within the moderate comfort range, except under head seas at 12 kn, where the values approached the alert thresholds. The MII remained within acceptable levels under most conditions, although probable interruption levels were observed on the passenger and vehicle decks during beam sea conditions. Overall, the findings emphasize that wave direction and vessel speed significantly influence motion-induced discomfort and operational performance, underscoring the importance of optimizing route planning and speed to improve passenger safety and seakeeping performance on roll-on/roll-off ferries.

MATERIAL RELIABILITY STUDY OF HIGH-SPEED SMALL CRAFT UNDER WAVE LOAD Wulandari, Amalia Ika; A, Alamsyah; S, Suardi; Setiawan, Wira; Pawara, Muhammad Uswah; Arifuddin, Andi Mursid Nugraha; Syahab, Husein
Journal of Marine-Earth Science and Technology Vol. 5 No. 3 (2024): December
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v5i3.3921

This study focuses on analyzing the structural characteristics of a small craft constructed using aluminum alloy compared with sandwich material structure. High speed vessels are designed to address key performance challenges such as vessel motion, engine efficiency, fuel consumption, and cargo capacity. However, to endure extreme wave induced loads, enhancement of vessel’s the structural strength is essential, especially in critical areas like the midship section. Analytical models and probabilistic methods are employed to predict structural performance under both constant and random wave loading conditions. Aluminum alloys are commonly chosen for fast boat construction due to their high strength to weight ratio and corrosion resistance. To evaluate structural behavior, simulations are carried out under varying wave heights and directions, providing insight into how the vessel performs in challenging marine environments. Load analysis is conducted using diffraction theory and the JONSWAP spectrum equation to determine the maximum bending moments experienced by the hull. The results show that both aluminum and sandwich structures exhibit similar reliability thresholds under wave-induced loading, but the sandwich structure consistently performs slightly better, with approximately 0.10% higher reliability. This suggests that sandwich materials offer improved structural integrity, making them the more suitable choice for high-speed small craft operating in wave conditions up to 2 meters. This analysis contributes to a deeper understanding of the reliability and performance of these materials, offering valuable guidance for designing and constructing high Small Crafts that perform efficiently and safely in demanding maritime operations.

The Analysis of Engine Room Vibration of Tugboat 24 M Alamsyah, Alamsyah; Kala, Charles Sambera; Wulandari, Amalia Ika
Maritime Park: Journal of Maritime Technology and Society Volume 1, Issue 3, 2022
Publisher : Department of Ocean Engineering, Faculty of Engineering, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/mp.v1i3.23608

A tugboat is a ship that guides large ships to dock, helps escort coal barges over bridges and also helps carry out rescues if needed. Some Tugboats had to experience increased engine power because they followed ministerial regulations. When in operation, the tugboat's engine generates the power necessary to move the ship, but on the other hand the engine also produces vibrations. Vibrations that occur on the ship have a side effect that damages the structural resistance of the ship's own construction. The purpose of this study is to find out the value of vibration and noise that occurs on the deck above the engine room due to increased engine power on the Tugboat. The method used is Finite Element Analysis using Ansys software. The results showed that the excitation frequency of the parent machine based on successive rpms was 14.99 Hz, 16.65 Hz, and 18.32 Hz. Based on the calculation of system amplitude, obtained value ranges of 8.73 x 10-10 to 8.25 x 10-10 for 1 machine and 1.14 x 10-9 to 5.65 x 10-10 for 2 machines. Then the standard vibration value is in the range of values 0.00012 to 0.00017 for 1 engine and 0.000652 to 0.000479 for 2 machines. Furthermore, the noise value obtained is in the range of 140.53 dB to 130.88 dB for 1 engine, and 140.68 to 130.75 for 2 engines. All results from calculations regarding vibration standards on the 2 deck models above the engine room get results according to standards, but the resulting noise value exceeds the limit, so it can be concluded that the construction of the engine room and deck is safe from vibration but has excessive noise.

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