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The Feasibility Study of Rectangular Floating Solar Panel Motion in Semangka Bay Waters Adietya, Berlian Arswendo; Gunawan, Yudy; Zakki, Ahmad Fauzan; Mursid, Ocid; Tuswan, Tuswan
International Journal of Marine Engineering Innovation and Research Vol 10, No 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.22296

With the depletion of mineral resources in Indonesia, the need for effective renewable energy alternatives has become critical. Solar energy, harnessed through photovoltaic panels, presents significant potential. However, the widespread adoption of solar panels remains limited due to their large land area requirements and susceptibility to damage. Floating solar panels, installed on water surfaces, offer a promising solution by enhancing energy efficiency through natural cooling while addressing land constraints. This study aims to analyze the motion dynamics of floating solar panels in Semangka Bay and identify the most effective design for open water conditions. Three models were tested: rectangular, kite-shaped, and perforated, using 3D simulation software. The analysis focused on the Response Amplitude Operator (RAO) under regular wave conditions at a 180° angle. The results revealed that Model 3, with 8 mooring points, exhibited the best performance in mitigating rolling, pitching, and heaving motions. The maximum rolling value reached 826.24 cm at 81 seconds, with a minimum of -735.36 cm at 86.7 seconds. Pitching peaked at 390.30 cm at 61.4 seconds and fell to -376.42 cm at 63.9 seconds. Heaving values ranged from a maximum of 17.64 cm at 62.8 seconds to a minimum of -220.94 cm at 83 seconds. This study concludes that Model 3 with 8 moorings offers superior stability, making it the optimal design for floating solar panels in open waters like Semangka Bay. By addressing environmental and implementation challenges, this research contributes significantly to advancing floating solar energy technology in Indonesia. The findings highlight the potential of efficient and resilient designs to harness Indonesia’s abundant solar energy resources effectively.

IDENTIFIKASI KERUSAKAN PADA PELAT SANDWICH LAMBUNG SISI MENGGUNAKAN METODE ELEMEN HINGGA Rizky Chandra Ariesta; Achmad Zubaydi; Abdi Ismail; Tuswan Tuswan
WAVE: Jurnal Ilmiah Teknologi Maritim Vol. 14 No. 2 (2020)
Publisher : National Research and Innovation Agency (BRIN Publishing)

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Pelat sandwich merupakan material baru yang tersusun atas material kulit dan material inti yang dapat digunakan untuk menggantikan pelat konvensional pada konstruksi kapal. Penggunaan material ini memiliki kelebihan dengan mengurangi berat sehingga dapat memungkinkan menambah muatan pada kapal. Dalam penerapan pelat sandwich diperlukan sistem untuk menentukan kerusakan pada strukturnya. Pada penelitian ini dikembangkan metode identifikasi kerusakan secara menyeluruh berdasarkan respon getaran. Kerusakan diidentifikasi dengan analisis getaran menggunakan metode elemen hingga (FEM). Variabel identifikasi berdasarkan besar volume kerusakan material inti. Analisis dilakukan pada pelat sandwich lambung kapal tanker dengan kekuatan yang telah memenuhi standard kelas Llyoid Register (LR). Pelat sandwich dimodelkan dengan kondisi batas dijepit kedua sisi untuk mendekati model sesungguhnya. Parameter penentuan besar kerusakan diperoleh dari perubahan frekuensi alami pada pelat. Penurunan frekuensi alami menunjukkan adanya kerusakan pada material inti sandwich.

The Feasibility Study of Rectangular Floating Solar Panel Motion in Semangka Bay Waters Berlian Arswendo Adietya; Yudy Gunawan; Ahmad Fauzan Zakki; Ocid Mursid; Tuswan
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4738

With the depletion of mineral resources in Indonesia, the need for effective renewable energy alternatives has become critical. Solar energy, harnessed through photovoltaic panels, presents significant potential. However, the widespread adoption of solar panels remains limited due to their large land area requirements and susceptibility to damage. Floating solar panels, installed on water surfaces, offer a promising solution by enhancing energy efficiency through natural cooling while addressing land constraints. This study aims to analyze the motion dynamics of floating solar panels in Semangka Bay and identify the most effective design for open water conditions. Three models were tested: rectangular, kite-shaped, and perforated, using 3D simulation software. The analysis focused on the Response Amplitude Operator (RAO) under regular wave conditions at a 180° angle. The results revealed that Model 3, with 8 mooring points, exhibited the best performance in mitigating rolling, pitching, and heaving motions. The maximum rolling value reached 826.24 cm at 81 seconds, with a minimum of -735.36 cm at 86.7 seconds. Pitching peaked at 390.30 cm at 61.4 seconds and fell to -376.42 cm at 63.9 seconds. Heaving values ranged from a maximum of 17.64 cm at 62.8 seconds to a minimum of -220.94 cm at 83 seconds. This study concludes that Model 3 with 8 moorings offers superior stability, making it the optimal design for floating solar panels in open waters like Semangka Bay. By addressing environmental and implementation challenges, this research contributes significantly to advancing floating solar energy technology in Indonesia. The findings highlight the potential of efficient and resilient designs to harness Indonesia’s abundant solar energy resources effectively.

Analysis of the Structural Response of a 2919 GT Ro-Ro Ship Due to Changes in Hull Construction Length Imam Pujo Mulyatno; Ahmad Fauzan Zakki; Kukuh Prakoso Wicaksono; Berlian Arswendo Adietya; Tuswan Adietya
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 4 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i4.4837

On the 2919 GT Ro-Ro vessel, structural geometry changes, specifically in the Length Between Perpendiculars (LPP) with additional framing, lead to variations in loading and maximum stress, in accordance with Biro Klasifikasi Indonesia (BKI) regulations in Volume II. Finite Element Method analysis reveals structural responses, particularly in the parallel middle body section. Initially, the vessel was 10.5 meters long to support loads of seven 20-foot trucks; modifications increased this to 13.5 meters for loads of seven 40-foot trucks and 18 meters for a combination of 20-foot and 40-foot truck loads. The analysis results indicate significant differences in the vessel’s maximum structural stress under truck-loaded conditions. For lengths of 10.5 meters, 13.5 meters, and 18 meters, the stresses remain within safe limits under all conditions (Calm Water, Sagging, and Hogging), with (sigma)ult lower than the allowable as set by BKI. However, the 18-meter length exhibits maximum stress approaching the safe threshold in the Hogging condition, with (sigma)ult = reaching 243.4 MPa, suggesting structural modifications are required to ensure vessel safety.

Uji Material Insulasi Termal LNG ISO Tank Pada Temperature Ruang. Arneta Mega Sundari; Hartono Yudo; Tuswan Tuswan
Jurnal Teknik Perkapalan Vol 14, No 2 (2026): April
Publisher : Diponegoro University

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Liquefied Natural Gas (LNG) memerlukan sistem insulasi termal yang mampu mempertahankan suhu rendah selama proses penyimpanan dan transportasi untuk meminimalkan terjadinya perpindahan panas dan boil-off gas. Polyurethane foam merupakan salah satu material yang banyak digunakan sebagai insulasi termal, namun masih diperlukan upaya peningkatan karakteristik mekaniknya. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan serat fiberglass terhadap densitas, konduktivitas termal, dan kekerasan Shore D polyurethane foam serta membandingkannya dengan polystyrene foam sebagai material insulasi LNG ISO Tank pada suhu ruang. Penelitian dilakukan secara eksperimental dengan membuat spesimen polyurethane foam menggunakan variasi fraksi massa serat fiberglass sebesar 0%, 5%, 10%, dan 15%. Pengujian densitas dilakukan berdasarkan ASTM C134-95, pengujian konduktivitas termal mengacu pada ASTM E1225, dan pengujian kekerasan menggunakan metode Shore D berdasarkan ASTM D2240. Hasil pengujian kemudian dianalisis untuk mengetahui pengaruh penambahan fiberglass terhadap karakteristik termal dan mekanik material insulasi. Hasil penelitian menunjukkan bahwa peningkatan fraksi massa fiberglass menyebabkan densitas meningkat dari 0,034 g/cm³ menjadi 0,072 g/cm³ serta meningkatkan nilai konduktivitas termal dari 0,0316 kcal/m·jam·°C menjadi 0,0359 kcal/m·jam·°C. Nilai kekerasan Shore D tertinggi diperoleh pada variasi fiberglass 10% sebesar 82 Shore D. Polystyrene foam memiliki nilai konduktivitas termal yang lebih rendah yaitu 0,0297–0,0305 kcal/m·jam·°C sehingga memberikan kemampuan insulasi termal yang lebih baik. Namun, polyurethane foam berpenguat fiberglass memiliki sifat mekanik yang lebih unggul. Oleh karena itu, penambahan fiberglass sebesar 10% dapat dianggap sebagai komposisi optimum karena memberikan keseimbangan terbaik antara kemampuan insulasi termal dan kekuatan mekanik material.

Repair Project Acceleration Strategy of Three Ship Units using Fuzzy Logic Analysis and Critical Path Method Hidayatus Ubyani; Tuswan Tuswan; Hartono Yudo; Haris Nubli; Ocid Mursid; Muhammad Iqbal
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.76502

This research uses the Critical Path Method (CPM) to analyze the main schedule of three combined ship repair projects. Then, shop-level planning is used to determine the productivity of each workshop so that each workshop knows the volume of work that needs to be completed daily. Furthermore, fuzzy logic is applied to analyze the risk of delays in repair project activities. The addition of working hours to critical work activities is accelerated from 30 days, the normal duration, to 23 days. Meanwhile, the addition of the workforce to critical work activities is accelerated from 30 days, the normal duration, to 22 days. The analysis of productivity values in each workshop results in the following productivity values: sandblasting and painting workshop 309.97 m2/person-days, piping workshop 4.12 units/person-days, fabrication workshop 407.16 kg/person-days, outfitting workshop 14.8 units/person-days, tank cleaning workshop 114.36 m3/person-days, and machining workshop 2.7 units/person-days. The fuzzy logic analysis results to determine the risk of delays in critical activities show that jobs with the codes SP1, SP2, SP3, SP4, M2, and SP5 have high risk of delay. Additionally, the collaboration with other departments in the company, such as the marketing, finance, and human resources departments, is ongoing to complete assigned tasks.

Enhancing Lubrication System Efficiency in Marine Diesel Engines with Centrifugal Separators - a Case Study Of LPG/C Arimbi: Technical and Cost-Effective Perspectives Tuswan Tuswan; Muhammad Fuad Rasyad; Untung Budiarto; Ocid Mursid; Andra Tanzani; Serliana Yulianti; Abdi Ismail; Rizky Chandra Ariesta
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.83063

The lubrication system in an engine is critical for reducing friction between components, preventing wear, reducing heat, protecting components from deposits, and sealing. Maintaining and extending the life of lubricants is crucial for lowering lubricant usage costs. A centrifugal separator is an auxiliary machine that cleans and separates two insoluble liquids with different densities. This study aims to evaluate the efficiency of lubricant life, lubricant usage cost savings, and return on investment time for a centrifugal separator. The study uses a case study of LPG/C Arimbi, where a centrifugal separator has helped maintain lubricants, prevent wear, and separate fuel and free water from lubricants. The centrifugal separator can also maintain Total Base Number (TBN) and viscosity values by filtering solid particles or wear elements up to a size of 0.5 µm. The study found that the difference in lubricant life was 11,780 hours, and the cost savings obtained were IDR 186,456,666 per year. The return on investment time for purchasing a centrifugal separator is three years and two months, assuming an average working hours of LPG/C Arimbi every year of 3,660 hours. Therefore, using a centrifugal separator can improve the efficiency of lubricant life and reduce lubricant usage costs, providing a positive return on investment in the long run.

Analisis Kegagalan Fungsi Kerja Bowl Disc System terhadap Tindakan Flushing Purifier pada Proses Pembersihan Bahan Bakar MFO di Kapal MV. Hammada Firyal Fariz; Ali Khamdilah; Eko Nur Hidayat; M Aji Luhur Pambudi; Tuswan
JURNAL BARTEK Vol 2 No 2 (2026): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/q0azyq80

The quality of Marine Fuel Oil (MFO) free from water and impurities is one of the primary factors in maintaining combustion efficiency and the reliability of the main engine's performance on board ships. One of the equipment playing an important role in maintaining this quality is the purifier, particularly through the flushing process utilizing the bowl disc component. However, functional failure of the bowl disc frequently causes a decline in the effectiveness of the flushing process, thereby risking a reduction in fuel quality and disrupting engine performance. This problem is commonly encountered on merchant vessels, including MV. Hammada, where suboptimal purifier maintenance directly affects the smoothness of ship operations. Based on this background, this study aims to analyze the functional failure of the Bowl Disc System on the effectiveness of the flushing purifier action in the MFO fuel cleaning process on board MV. Hammada. This research employs a descriptive qualitative method through direct observation, technical measurements (dial shaft and RPM), and interviews with the Engine Room Chief and Fourth Engineer. The results indicate that stable RPM (7,300–7,425 rpm) and appropriate sealing water pressure significantly influence the success of the separation process. It was also found that variations in purifier operating temperature (76–92°C) affect the resulting fuel quality, with the ideal temperature range being 85–95°C. Factors causing bowl disc functional failure include insufficient routine maintenance, poor fuel quality, and blockage in the sealing water line. Based on these findings, this study recommends increasing the frequency of visual inspections, conducting periodic shaft alignment measurements, and consistently controlling purifier operating parameters to keep the MFO separation process optimal and support the overall reliability of shipboard engine operations.

Effect of post-weld heat treatment and cooling techniques on mechanical performance of AH36 steel for marine structures Ahmad Firdhaus; Blinka Hernawan Prasetya; Muhammad Adnan Rivaldi; Parlindungan Manik; Tuswan Tuswan
International Journal of Advances in Applied Sciences Vol 15, No 3: September 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v15.i3.pp944-953

The mechanical properties of structural steels used in marine environments are significantly affected by welding procedures. This research examines the impact of various cooling techniques, coupled with post-weld heat treatment (PWHT), on the strength and ductility of AH36 steel welded via shielded metal arc welding (SMAW). Heat treatments were conducted at temperatures of 450 °C, 600 °C, and 750 °C. Oil quenching and normalizing were employed as the two cooling processes. Tensile strength, elastic modulus, elongation, and impact toughness were measured through mechanical testing. The findings demonstrate that oil quenching after treatment at 450 °C yields the most favorable tensile strength and elongation properties, surpassing established safety standards. Conversely, increasing the treatment temperature to 600 °C and 750 °C reduces strength and ductility, presumably due to grain coarsening and microstructural weakening. Impact toughness is substantially improved by normalizing, especially at 600 °C, which offers the best balance of strength and toughness. These findings show that PWHT at 600 °C followed by normalizing markedly improves the mechanical properties of AH36 steel, ensuring dependable performance in harsh marine environments. This research helps improve weld quality and the safety of marine structures by carefully selecting heat treatment and cooling procedures.

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