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All Journal Traksi : Majalah Ilmiah Teknik Mesin TEKNIK KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Mechatronics, Electrical Power, and Vehicular Technology Department of Naval Architecture Mekanika: Majalah Ilmiah Mekanika Jurnal Penelitian Enjiniring Fakultas Teknik Unhas International Journal of Marine Engineering Innovation and Research Journal of Marine-Earth Science and Technology International Journal of Marine Engineering and Applications
Hartono Yudo
Naval Architecture Department, Faculty Of Engineering, Diponegoro University, Semarang, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Pembuatan Repair Schedule 2 Unit Tongkang Dan 1 Unit Kapal Dengan Analisis Perbandingan Akurasi Metode MPERT Dan Metode PERT Fakhrian, Muhamad Zaki; Santosa, Ari Wibawa Budi; Yudo, Hartono
Jurnal Teknik Perkapalan Vol 11, No 4 (2023): Oktober
Publisher : Diponegoro University

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Abstract

Kapal memiliki proses perbaikan dan proses perawatan yang harus sangat diperhitungkan, sehingga tahap yang dilakukan dalam penelitian ini adalah :1)  pengolahan data Repair List tongkang Buana Jaya 3002, tongkang Buana Jaya 3003, dan kapal LCT Santoso 3, 2) memperhitungkan volume, durasi pekerjaan, tenaga kerja, serta peralatan, fasilitas galangan beserta mobilitasnya, 3) membuat Repair Schedule dari 3 objek penelitian dengan Microsoft Project, 4) melakukan perhitungan produktivitas dan produktivitas alternatif percepatan dengan Microsoft Excel, 5) melakukan perhitungan akurasi dengan metode Manual Project Evaluation And Review Technique ( MPERT ). Dari hasil pergitungan Crashing didapatkan durasi dengan penambahan jam kerja untuk  jenis pekerjaan Sand Blasting selama 9  hari, Steelwork 30 hari, Propulsion Service selama 3 hari, Painting selama 9 hari, dan untuk durasi dengan penambahan tenaga kerja  jenis pekerjaan Sand Blasting selama 9  hari, Steelwork 30 hari, Propulsion Service selama 3 hari, Painting selama 9 hari. Untuk hasil akurasi metode MPERT memiliki akurasi sempurna untuk 2 jenis pekerjaan, dan akurasi senilai 99,30% untuk jenis pekerjaan Steelwork, dan 95,86% untuk jenis pekerjaan Sand Blasting. Untuk hasil akurasi metode PERT memiliki akurasi sempuner untuk 2 jenis pekerjaan, dan akurasi senilai 90,00% untuk jenis pekerjaan Steelwork, dan 69,23% untuk jenis pekerjaan Sand Blasting.
Pengaruh Perlakuan Zat H2O2, KMnO4, dan NaOH, pada Bahan Komposit Berpenguat Bambu Petung dengan Matriks Resin Epoxy Terhadap Beban Tarik, Tekuk, dan Impak Prasetyo, Emut Andi; Yudo, Hartono; Santosa, Ari Wibawa Budi
Jurnal Teknik Perkapalan Vol 11, No 4 (2023): Oktober
Publisher : Diponegoro University

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Abstract

Kemajuan teknologi dalam bidang industri perkapalan mendorong permintaan kebutuhan bahan konvensional seperti logam, kayu dan bahan sintetis untuk mendapatkan material kontruksi yang baik.. Tujuan dari penelitian ini adalah untuk mengetahui kekuatan tarik, tekuk, impak dari material komposit serat bambu petung dengan pengaruh penambahan bahan kimia H2O2, KMnO4, dan NaOH. Metode yang digunakan dalam penelitian ini adalah dengan melakukan pengujian tarik, tekuk dan impak terhadap material komposit untuk dibandingkan dengan peryaratan yang ditetapkan oleh Biro Klasifikasi Indonesia (BKI). Hasil yang diperoleh untuk kekuatan tarik laminasi bambu petung yang paling tinggi terdapat pada spesimen dengan penambahan zat kimia H2O2, dengan  kuat tarik rata- rata sebesar 151.30Mpa. Pengujian kekuatan tekuk  yang paling tinggi terdapat pada spesimen dengan penambahan zat kimia H2O2  yaitu sebesar 269.54 Mpa. Nilai pengujian impak juga  berbanding lurus dengan nilai pengujian tarik dimana spesimen dengan penambahan H2O2  memiliki kuat impak tertinggi yaitu sebesar 142.25 kJ/  Komposit berpenguat serat  bambu petung dengan dengan matriks epoxy dapat digunakan sebagai material kulit kapal karena telah memenuhi persyaratan minimum yang ditetapkan oleh BKI.
RELIABILITY BASED MAINTENANCE ANALYSIS OF THE MAIN ENGINE LUBRICATION SYSTEM OF THE KM-KELIMUTU SHIP Yudo, Hartono; Dwi Putra Naya, Radityo Habil
TRAKSI Vol 24, No 1 (2024): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.24.1.2024.133-146

Abstract

The main engine on KM. Kelimutu operates with the help of KM. Kelimutu ship system itself. The exitences of  a system that can be considered very critical is lubrication system of the main engine. The lubrication system for the main engine of KM. Kelimutu itself has task of the supporting the smooth operation of the main engine by distributing good lubrication and in accordance with the main engine indicators. Failure of this lubrication system will have a negative impact on the main engine, therefore the purpose of this study is to analyze the KM. Kelimutu lubrication system with the reliability method. In this study, the reliability method used to analyze the lubrication system uses qualitative analysis and quantitative analysis. Qualitative analysis using Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA). Meanwhile, for quantitative analysis by conducting a Monte Carlo simulation. The results of this study indicate that the most critical component in KM. Kelimutu lubrication system is a filter with an initial Risk Priority Number (RPNi) value of 592, and if the component have 2 pieces such as a filter, transfer pump, Lo pump, and also a Lo separator have failed.  The results of the simulation show Availability is 0,96 and MTTF (Mean Time to Failure) is 697,76082.
THE FIXED BAFFLE EFFECT ANALYSIS TO FILLING TANKS VARIATION ON THE STABILITY OF 4999 DWT TANKERS Yudo, Hartono; Amiruddin, Wilma; Guna Satriananta, Mahendra; Putra Nur Hidayat, Wahyu
Journal of Marine-Earth Science and Technology Vol. 2 No. 3 (2021): 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.v2i3.163

Abstract

The tanker is transportation to distribute the results of oil and gas exploration, where most of the exploration results come from the ocean. In this study, an analysis of the effect of adding fixed baffles with a certain number of baffles on the stability of the tanker will be carried out. The method in this study is to analyze the data of 4999 DWT tankers using Maxsurf Stability Software. The simulation was carried out in 4 percentage variations, namely 30%, 40%, 70%, and 90%, with full baffle installation in each tank. After calculating the stability analysis on the 4999 DWT tanker, it was found that the model I tank (without baffles) did not meet IMO standards. While the model II tank (1 fixed baffle), model III tank (2 fixed baffles), and model IV tank (3 fixed baffles) on various fillings have met IMO standards. Where the tank model IV (3 fixed baffles) has the best stability value with a GZ value of 1.881 m at 30% filling, 1.602 m at 50% filling, 1.051 m at 70% filling, and 0.706 m at 90% filling. It was concluded that the addition of a fixed baffle to the tank was effective in increasing the stability of the tanker.
The Application of Grasshopper to Redesign Ship Hulls with a Parametric Approach Method Based on Delftship Reference Hadi, Eko Sasmito; Rindo, Good; Adietya, Berlian Arswendo; Alifviar, Muhamad Riza; Yudo, Hartono
International Journal of Marine Engineering Innovation and Research Vol 9, No 4 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i4.21773

Abstract

More than a year has passed since Francisco Pérez-Arribas (2023) introduced a parametric-based hull design method using Python scripts, beginning with the cross-sectional area (CSA) design. Several experimental studies have been carried out to improve the method and the quality of ship design. This study aims to generate an optimal hull design by utilizing normal vectors derived from the x and y vectors. These normal vectors are applied parametrically to determine the shape of the hull. The study also employs a cubic spline-based parametric technique for designing yacht hulls. The purpose of this study is to introduce the concept of parametric design through the development of visual programming used to form cross-sectional area curves and generate hull geometry. This study also discusses both the advantages and limitations of using visual programming approaches to accelerate the design process. By varying the CSA shape of the DelftShip model, the resulting parametric model has a high level of accuracy, with a difference of - 0.097016% in LCB and -0.28785% in volume when compared to the DelftShip model. results from Grasshopper reveal significant differences, particularly below a draft of 0.475, where the CP values from Grasshopper are lower than those from DelftShip. The parametric approach using normal vectors not only facilitates design exploration but also holds the potential to enhance overall hull design quality and optimization.
IMPLEMENTATION OF RCM IN MAINTENANCE STRATEGY OF FO SYSTEM, LO SYSTEM, AND COOLING SYSTEM MAIN ENGINE Yudo, Hartono; Nizar, Vania Early; Hadi, Eko Sasmito; Mulyatno, Imam Pudjo
IJMEA International Journal of Marine Engineering and Applications Vol 3 No 1 (2026): March 2026
Publisher : Department of Marine Engineering, Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/ijmea.v3i1.395

Abstract

The performance of a ship’s main engine largely depends on the reliability of its three primary subsystems: fuel, lubricating, and cooling. These systems must operate optimally to ensure efficiency and safety under varying operational conditions. This study evaluates the reliability of the KM. Lawit main engine subsystems using the Reliability Centered Maintenance (RCM) approach. Four analytical methods were applied: Failure Mode and Effect Analysis (FMEA) to identify critical components, Fault Tree Analysis (FTA) to trace root causes of failures, Reliability Block Diagram (RBD) to model interrelationships, and Monte Carlo simulation to estimate system reliability probabilistically. The analysis was based on operational and maintenance data from 2023–2024. FMEA identified the duplex filter in the fuel system (RPN = 288), the lubricating oil filter (RPN = 280), and the expansion tank in the cooling system (RPN = 140) as the most critical components requiring priority maintenance. Monte Carlo simulation over a 3,250-hour period showed the cooling system achieved the highest reliability, with a Mean Time to Failure (MTTF) of 1,022.21 hours and a Mean Time Between Failures (MTBF) of 7,587.47 hours. Across all systems, availability levels exceeded 99%, indicating strong reliability and minimal risk of operational failure. These findings highlight the effectiveness of integrating FMEA, FTA, RBD, and Monte Carlo simulation within the RCM framework. The results emphasize the need for preventive maintenance strategies to sustain the long-term operational stability and safety of the main engine
Pengaruh Variasi Bentuk Kampuh Dengan Proses Post Weld Heat Treatment Annealing Pengelasan SMAW Baja SS400 Terhadap Kekuatan Tarik dan Impak Kipuw, Joanne Valen; Santoso, Ari Wibawa; Yudo, Hartono
Jurnal Teknik Perkapalan Vol 14, No 1 (2026): Januari
Publisher : Diponegoro University

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Abstract

Baja SS 400 merupakan material struktural yang termasuk baja karbon rendah yang umum dijadikan bahan pembuatan kontruksi terutama pada industri perkapalan. Penelitian ini bertujuan untuk mengetahui pengaruh dari bentuk kampuh berupa single V-Groove dan double V-Groove 65° pengelasan SMAW posisi 1G (Down Hand) yang diberikan perlakuan panas berupa Post Weld Heat Treatment (PWHT) Annealing terhadap sifat mekanis baja SS 400. Pengujian tarik dan impak mengacu pada standar ASTM E8 dan ASTM E23. Hasil penelitian menunjukan bahwa double V-Groove dengan PWHT memiliki nilai tegangan tarik 400,48 MPa, nilai regangan tarik 17,5%, nilai modulus elastisitas 26,04 GPa dengan harga impak 0,92 J/mm² sedangkan double V-Groove tanpa PWHT memiliki nilai tegangan tarik 406,12 MPa, nilai regangan tarik 15,5%, nilai modulus elastisitas 27,1 GPa dengan harga impak 0,76 J/mm². Single V-Groove dengan PWHT memiliki nilai tegangan tarik 347,26 MPa, nilai regangan tarik 8%, nilai modulus elastisitas 57,9 GPa dengan harga impak 1,02 J/mm² sedangkan single V-Groove tanpa PWHT memiliki nilai tegangan tarik 370,10 MPa, nilai regangan tarik 4,5%, nilai modulus elastisitas 84,08 GPa dengan harga impak 0,95 J/mm². Berdasarkan hasil penelitian menunjukkan bahwa Double V-Groove tanpa PWHT memperoleh nilai kekuatan tarik tertinggi sedangkan Single V-Groove dengan PWHT memperoleh harga impak tertinggi.
Repair Project Acceleration Strategy of Three Ship Units using Fuzzy Logic Analysis and Critical Path Method Ubyani, Hidayatus; Tuswan, Tuswan; Yudo, Hartono; Nubli, Haris; Mursid, Ocid; Iqbal, Muhammad
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

Abstract

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.
Co-Authors A.F. Zakki Abdi Wira Etua Sihombing Abdurrachman Fiqri Achmad F.R. Prabowo Achmad Nurochman Ade Purnawan Adietya, Berlian Arswendo Afriandi Ginting, Afriandi Agung Putra Agung Surana Dwi Yoga Ahmad Fauzan Ahmad Fauzan Zakki Akbar, Ilham Fathony Alexander Martua Napitupulu Alfikri Hidayat, Alfikri Alifviar, Muhamad Riza Amhar Wahyudi Harahap, Amhar Wahyudi Aminuddin, Rahmat Ridlo Amirudin, Wilma Andi Haris Muhammad Andi Trimulyono Andreas Geraldine A Andromeda, Trias Angga Pradipta Anggita Firda Renatasari Anggoro Prabu Dewanto Arfan Abdul Ghofur Ari Wibawa Budi Santosa Ary Ramadhan Asmara, I Putu Sindhu Astarry Nugroho Azzaky Alghifari, Azzaky Berlian Arswendo Adietya Bintang Nurcahyo Candra, Ronaldo David Chandra Dennis Oscha Cholik Dewa Anjar Nyawa Dhawala, Pakavy Aqshall Dwi Putra Naya, Radityo Habil Egar Haneshananta Sihombing Egar Haneshananta Sihombing Eko Sasmito Hadi Fabya, Daryl Fahrudin, Hasim Try Faiq Fachri Assaify Fakhrian, Muhamad Zaki Farobi Tetuko Pujikuncoro, Farobi Tetuko Fauzan Zakki, Ahmad Febby Ari Saputro Frastiana Ramadhan Basri Good Rindo Guna Satriananta, Mahendra Hadi, Eko Sasmito Hanung Bayu Setiawan Hanzallahh, Muhammad Thareq Fajri Harry Pratama, Muhammad Herman Josef Emerald Hidayat, Nur Fajar Huda, Muhammad Hafid I Made Andrean Nanda Setiawan Ighel Bryantama Putra Ihsan Aldi Prasetyo Ilham Abror Ilham Chaerul Rizqi Siregar Imam Cahyadi Imam Handhika, Imam Imam Pujo Mulyanto Imam Pujo Mulyatno Irianto, Prasetya Tomi Irvan Putera Samudera Jatmiko, Arif Budi Jaya Permana Karen Octa Angelica Khaeru Roziqin Kipuw, Joanne Valen Kiryanto Kiryanto Luukfandi Lukfandi M Yaqut Zaki Aji M. Haris Fikri Sulthoni M. Harris Nubly M. Nafis Setiawan Maharani, Heslina Fifani Mahardika Adi Dewantara Mahendra Guna Satriananta Mahendra Guna Satriananta Maulana Dicky Almanda Mawahib, M Zaenal Mizyal Laudany, Mohammad Rabith Mochamad Arif Rachman Mohammad Budi Hermawan Moriko Syahruddin Mu'afifah, Fajriyatul Muhamad Hizrian Hutama Muhammad Akbar Ferbian Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Jordi Muhammad Rifqy Muhammad Wahyu Prihantoro Muhammad, Bakhtiar Mulyatno, Imam Pudjo Nadhila Shabrina Riyanto Nizar, Vania Early Nono, Ferdinand Gerald Bogar Nubli, Haris Nuriman, Fadli Nyawa, Dewa Anjar Ocid Mursid Pangestu, Naufal Pani Prima Tambunan Parlindungan Manik Prasetya, Angga Adi Prasetyo, Catur Fatwa Prasetyo, Emut Andi Pratama, Rezky Naufal Pujiyanto pujiyanto Putra Nur Hidayat, Wahyu Rabbi Radhiya, Rabbi Rachmat Hidayat Raden Mas Firmansyah Bagas Pradipta Relinton B Manalu Reyanld Daniel Nicholas Manurung Rezky Naufal Pratama Richad Yunanto Riki Agustian, Riki Rinanggara, Yozar Rindo, Good Riyanto, Nadhila Shabrina Rizki Aziz Radyantama Rizki Rizcola Rohmat Bagus Sucipto Samuel Samuel Sangga Dwiki Tavarel Santoso, Ari Wibawa Sarjito Joko Sisworo Sarjito Joko Sisworo Sarjito Jokosisworo Sarjito Jokosiworo Sarjito Jokosiworo Septaji Indrasahputra Seto Yuwantoro Siahaan, Fredits A Sinaga, Ebin Ezer Slamet Haryo Samudro Sukanto Jatmiko Surya Ari Wardana Tanellia Soraya N Tri Admono Tuswan Tuswan Ubyani, Hidayatus Ucok Maruli Silalahi Untung Budiarto Veriyanto Veriyanto Vicky Bhaskara Sardi Wahid, Rakhmat Aizzat Wijaya, Stefanus Victorino Candra Wilma Amiruddin Yolanda Adhi Pratama, Yolanda Adhi Yudha Adhitiya Wardhana Yudya Saddita Rokhim Yuli Prastyo