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All Journal IJOCE (International Journal of Offshore and Coastal Engineering) e-NARODROID
Wimala Lalitya Dhanistha
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Computer Science & IT Engineering

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Prediksi Ketinggian Gelombang Berbasis Jaringan Syaraf Tiruan (JST) di Laut Jawa Wimala Lalitya Dhanistha
e-NARODROID Vol 2 No 1 (2016)
Publisher : Universitas Narotama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31090/narodroid.v2i1.134

Abstract

Indonesia merupakan negara kepulauan, oleh sebab itu jalur perdagangan paling padat adalah jalur laut. Potensi kecelakaan pelayaran di Indonesia salah satunya disebabkan oleh ketinggian gelombang (Hs) yang besar. Jaringan Syaraf Tiruan merupakan salah satu algoritma yang dapat memprediksi ketinggian gelombang berdasarkan kecepatan angin dan ketinggian gelombang. Penelitian ini memprediksi ketinggian gelombang satu jam kedepan. Rata-rata Root Mean Square Error (RMSE) yang didapatkan sebesar 0.04. Kata kunci: ketinggian gelombang, JST, kecepatan angin
Health and Safety Analysis for Fisherman in East Surabaya, Indonesia Santi Frestiqauli; Daniel Mohammad Rosyid; Wimala Lalitya Dhanistha; Anita Kusuma Wardhani; Shade Rahmawati; Madea Eka Silfiani
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v10i1.9919

Abstract

The number of fishermen in Indonesia has continued to decline in the last decade as reported by the Statistics of Marine and Coastal Resources 2021. In 2010 the number of fishermen was recorded at 2.16 million people. But in 2019, the number was recorded at only 1.83 million people. Thus, there was a decrease in the number of fishermen by 330,000 people in 2010-2019. The fisheries sector is one of the most dangerous industries. In contrast, the health and safety of the people, especially fishermen are too far below occupational health and safety feasibility standards. This research used job safety analysis method for hazard identification and risk assessment for fisherman activities during preparation, operation, and pasca-operation. Data were collected through observation and interview 30 fishermen in East Surabaya. Results of observations divided by three activities shows that fishermen don’t prepare themselves with safety kit or safety equipment, including for personal protective equipment. The conclusion is most potential hazards could be minimized by using personal protective equipment. To minimize the risk of fatality, fishermen should carry a first aid kit, and communication devices and should be accompanied when going to sea. There are future research and program to increase fisherman awareness prior to safety.
Analyzing the Effect of Variation in Shielding Gas Flow Rate and V Groove Type Towards Tensile and Metallographic Testing of GMAW Weld Joint of ASTM A53 and A36 Herman Pratikno; Wimala Lalitya Dhanistha; Andrea Novia Samiyono
International Journal of Offshore and Coastal Engineering Vol. 4 No. 1 (2020)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8706

Abstract

Steel is a metal that commonly used in fabrication, engineering, and reparation activities in the structure construction industry. ASTM A53 steel is a low carbon steel with 0.25% to 0.3% of carbon content so it has a high weldability. ASTM A36 steel is a low carbon steel with carbon content of 0.25% to 0.29% and is often used in the floating building industry. This study aims to determine the effect of shielding gas flow rate and V-groove type to the tensile strength of A53 steel welded with A36 steel by Gas Metal Arc Welding (GMAW) method. The shielding gas level used is 100% CO2 with flow rate variations, including 15 liters/minute, 20 liters/minute, and 25 liters/minute. The groove types used are Single V-Groove and Double V-Groove. Tensile strength test result showed that in the welding process in this study, specimen with 25 liters/minute flow rate on the Double V-Groove had the highest tensile strength value of 516.73 MPa, with the narrowest HAZ width of 0,87 mm on A36’s HAZ and 1,22 mm on A53’s HAZ, and the smallest percentage of ferrite in the microstructure as much as 56.34% and 43.66% pearlite.
The Effect Analysis of Coating Thickness Variation and Mixed Composition of Zinc - Graphite on Epoxy Coating with Steel Plate ASTM A36 Herman Pratikno; Wimala Lalitya Dhanistha; Andry Febrianto
International Journal of Offshore and Coastal Engineering Vol. 4 No. 1 (2020)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8707

Abstract

Analysis of Abrasive Materials dan Air Pressure Variations for Thermal Spray Aluminum Coating on Adhesion Strength and Corrosion Resistance in Seawater Environment Herman Pratikno; Raymond Danielle Mulya; Wimala Lalitya Dhanistha
International Journal of Offshore and Coastal Engineering Vol. 9 No. 1 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i1.4467

Abstract

Marine structures must withstand the marine environment for a certain design life. However, corrosion causes a decrease in structural integrity before reaching the design life. Thermal spray aluminum coating becomes a protection method because of its resistance to corrosion in the long term. This study analyzed the effect of variations in abrasive materials and air pressure on thermal spray aluminum coating on ASTM A36 steel. The steel material will be blasted with two types of abrasive materials, namely garnet and aluminum oxide, then coated using the electric arc wire spray method at pressures of 2.5 bar, 3.5 bar, and 4.5 bar. Testing was carried out using the pull-off adhesion test and the three-electrode cell method. The results showed that the highest adhesion strength of 12.2 MPa occurred at 4.5 bar aluminum oxide, while the lowest was 6.3 MPa at 2.5 bar garnet. The lowest corrosion rate of 0.001 mm/year was obtained at 4.5 bar garnet, and the highest was 0.101 mm/year at 2.5 bar aluminum oxide. Based on the results of the corrosion rate test, it can be concluded that the increase in pressure is directly proportional to the increase in coating performance in resisting corrosion. Conversely, the increase in surface roughness is inversely proportional to the coating performance in resisting corrosion.
Co-Authors Andrea Novia Samiyono Andry Febrianto Anita Kusuma Wardhani Daniel Mohammad Rosyid Herman Pratikno, Herman Madea Eka Silfiani Raymond Danielle Mulya Santi Frestiqauli Shade Rahmawati