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All Journal TEKNIK KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Department of Naval Architecture Sinergi INOVTEK POLBENG Warta Penelitian Perhubungan International Journal of Marine Engineering Innovation and Research Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Kolaborasi Jurnal Pengabdian Masyarakat Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Andi Trimulyono
Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Transportation

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Cover V. 18, No. 3 Andi Trimulyono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

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Abstract

Analisa Pengaruh Parameter Jarak Partikel, Angka CFL, dan Koefisien Artificial Viscosity Terhadap Akurasi Pemodelan Gelombang dengan SPH Ilham Abror; Andi Trimulyono; Hartono Yudo
Jurnal Teknik Perkapalan Vol 10, No 2 (2022): April
Publisher : Diponegoro University

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Abstract

Dinamika fluida komputasi telah banyak digunakan dalam proses pembuatan kapal. Banyak metode untuk menganalisis fluida secara komputasi. Salah satunya dengan menggunakan metode SPH yang kerap digunakan dalam dunia kemaritiman untuk menganalisa tentang fluida. Dalam SPH medium tangki yang digunakan biasanya berukuran medium dengan jumlah gelombang 3 – 4. Sehingga beberapa variabel tidak cocok untuk digunakan dalam kasus gelombang panjang yang jumlah gelombangnya melebihi 4 dan tengki yang yang panjang. Penelitian ini bertujuan untuk mendapatkan parameter yang cocok untuk long distance propagatioan. Penelitian ini akan membahas kesensitifan parameter dp, CFL, dan koefisien artificial viscosity. Untuk nilai dp yang cocok digunaka adalah rentang 3-6mm, CFL dengang rentang nilai 0.2 dan koefisien artificial viscosity 0.001. Sehingg dapat disimpulkan bahwa nilai dp, CFL, dan koefisien artificial viscosity sangat berpengaruh pada simulasi numerik gelombang long distance propagation.
Analisa Kinerja Pelabuhan dan Utilitas Alat di PT. PBM Tangguh Samudera Jaya Ignasius Sihotang; Wilma Amiruddin; Andi Trimulyono
Jurnal Teknik Perkapalan Vol 10, No 3 (2022): Juli
Publisher : Diponegoro University

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Abstract

Pelabuhan Bongkar Muat PT. Tangguh Samudera Jaya dirancang untuk memproses pelayanan peti kemas di Pelabuhan Tanjung Priok, Jakarta. Tujuan penelitian ini untuk mendapatkan skenario paling efektif untuk menurunkan nilai BOR sesuai standar yang ditetapkan yaitu ≤ 70% tanpa melakukan perluasan lapangan penumpukan. Metode yang digunakan yaitu metode analisis data untuk nilai utilitas dan analisis data untuk mendapatkan nilai BOR menggunakan bantuan software Microsoft Excel. Hasil penelitian ini berupa nilai utilitas peralatan bongkar muat dan nilai Berth Occupancy Ratio (BOR) standart atau tidak. Hasil perhitungan bahwa nilai BOR pada tahun 2016-2020 di PT. TSJ masih memenuhi kriteria yakni 70% dari kapasitas tersedia sehingga masih sesuai dengan standar yang ditentukan. Nilai utilitas alat untuk Container Crane, Rubber Tyred Gantry Crane,dan Head Truck masih sesuai dengan kriteria standar utilitas alat yang ditetapkan yaitu ≤ 80%.
Productivity Analysis Using the Critical Chain Project Method Management (CCPM) on Repair Projects Geomarin-III ship 649 DWT. Ari Wibawa Budi Santosa; Ocid Mursid; M. Angger Kalingga; Syaiful Tambah Putra Ahmad; Andi Trimulyono
International Journal of Marine Engineering Innovation and Research Vol 8, No 1 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i1.15169

Abstract

Ship repair project planning still often encountered problems that delay ship repair projects to achieve complete ship repair projects. Delays are due to frequent mismatches between ship repair scheduling and conditions that occur at the shipyard. The most commonly used method is the Critical Path Method (CPM). But in reality, the CPM method is considered less effective because there is still safety time for each job. Technological developments found the latest method, namely Critical Chain Project Management (CCPM). This method removes the safety time contained in the CPM method and replaces it with buffer time which is placed at the end of work activities. This study aims to analyze the duration of the critical path, determine labor costs, and the amount of buffer duration on the repair of the Geomarin-III 649 DWT ship. Based on the calculation results obtained on the repair of the Geomarin-III 649 DWT ship with the Critical Chain Project Management (CCPM) method is 10 days, 10 days faster than the normal duration. The labor cost obtained using the CCPM method is IDR. 54,017,500, saving 35% of the normal cost is IDR. 82,680,000, but if the buffer time is used thoroughly, the total estimated labor cost for the CCPM method will increase due to the addition of labor and the duration of the buffer time obtained by the CCPM method as a substitute for safety time, which is 9 days project buffer and 3 days feeding buffers. Based on this research, it was found that the CCPM method is considered effective and can accelerate the duration of the project and minimize labor costs.
Analysis of the Effect of Voltage and Zinc Plating Duration on Low Carbon Steel A36 by Electroplating Process on Corrosion Rate Ari Wibawa Budi Santosa; Agil Arianda Alkhudry; Untung Budiarto; Eko Sasmito Hadi; Andi Trimulyono
International Journal of Marine Engineering Innovation and Research Vol 9, No 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.20262

Abstract

Corrosion is a significant issue in steel constructions, and zinc coating (electroplating) is one of the methods used to protect steel from corrosion. This research aims to analyze the effect of voltage and duration of zinc coating on low carbon steel A36 through the electroplating process on the corrosion rate and coating thickness. An experimental method was employed, varying the voltage (6, 8, and 10 Volts) and coating duration (10, 20, and 30 minutes) during the electroplating process using a ZnO solution. The corrosion rate was tested electrochemically in a 3.5% NaCl solution. The results showed a significant correlation between voltage, coating duration, corrosion rate, and coating thickness. Higher voltages and longer durations produced thicker zinc coatings and reduced the corrosion rate. The optimal conditions were found at 10 Volts for 30 minutes, producing a 160 μm thick coating and the lowest corrosion rate of 0.00318 mmpy. The minimal coating condition, 6 Volts for 10 minutes, resulted in a 30 μm thick coating and a corrosion rate of 0.050120 mmpy.
Analysis of the Time Cost Trade-Off Method Application on Tug Boat 135 GT Repair Projects Owned by PT. Pelabuhan Indonesia II Santosa, Ari Wibawa Budi; Trimulyono, Andi; Firnandito, Anugrah; Subekti, Joko; Hadi, Eko Sasmito
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.52415

Abstract

In the project implementation process, there is still the possibility of delays, as in the case of the Tanjung Buyut I Tug Boat ship repair project - 206 135 GT calculations are needed to accelerate the project to determine the optimum time and cost. One method that can be used in accelerating projects / crashing projects is the Time Cost Trade-Off method. This method can be used to solve this problem by adding specific alternatives such as working hours, labor, and other things with the minimum additional cost. In this study, an alternative acceleration was carried out by adding manpower and working hours duration of 1 to 4 hours which would be applied to the Hull repair project for the Tug Boat Tanjung Buyut I-206 135 GT. Based on the results of the analysis that has been carried out on the work of the Hull section, which is included in the critical activity, it is obtained that the most optimum duration acceleration is the addition of working hours (overtime) for 3 hours and an additional workforce of 24 peoples which results in an acceleration of time of 17 days from the normal duration of 60 days to 43 days with a time efficiency of 28%, as well as a cost reduction of IDR 19,700,000 or around 3.34% compared to the normal duration fee of IDR 571,950,000 to IDR 552,250,000.
Design of Remotely Operated Underwater Vehicle (ROUV) for Underwater Metal Detection Widjaja, Raden Sjarief; Purwanto, Dedi Budi; Trimulyono, Andi; Hafizh, Muhammad Nur Abdullah
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.62767

Abstract

The underwater surveys and inspections in Indonesia were carried out mostly by the operation of practical divers who were limited to shallow waters. The deep - sea exploration requires more advanced technology. The development of underwater technology is required to support many functions of underwater surveys and inspections. The purpose of this study was to design a Remotely Operated Underwater Vehicle (ROUV) for detecting objects with metallic materials. The ROV was designed with a Penta Tubular model and camera assistance for navigation, the JSNSR04T ultrasonic sensor to detect object distances, and the LJ12A3 inductive proximity sensor as a metal detector. ROUV rides are controlled using a keyboard with certain keywords and monitored using a smartphone. Testing the JSN-SR04T Ultrasonic sensor uses 5 variations of distance, namely 20cm, 40cm, 60cm, 80cm, and 100cm, with the detection object in the form of a plate with dimensions of 35cm x 35cm. For testing the inductive proximity sensor, the LJ12A3 type uses 3 variations of materials, namely steel plate, aluminum plates as metal objects, and PVC plates as control materials. Tests were carried out in two mediums, namely in air and underwater. Based on the results of data retrieval testing of the ultrasonic distance sensor in the air, the smallest error percentage is 0.06%, and the highest error percentage is 0.705%. In the underwater test, the error percentage was 0.49% for a distance variation of 100 cm. The ultrasonic distance sensor type JSN-SR04 cannot read distance data below 89.75 cm in water due to differences in the speed of sound propagation in different media. The Inductive Proximity Sensor can work well in air and water mediums with 100% accuracy on steel plates, aluminum plates, and PVC plates.
CFD Analysis of Interference Factor in Hydrofoil-Supported Catamarans (HYSUCAT) Firdhaus, Ahmad; Kiryanto, Kiryanto; Rindo, Good; Trimulyono, Andi
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 1 (2024): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i1.61750

Abstract

Catamaran, with its distinctive dual-hull design, offers unique advantages in maritime applications, including improved stability and space utilization over traditional monohull vessels. However, the interaction between the two hulls generates complex hydrodynamic phenomena, significantly influencing the vessel's overall performance. One critical aspect of this interaction is the interference factor, which affects the hydrodynamic resistance encountered by the vessel. The purpose of this paper is to investigate the changes in hydrodynamic characteristics that occur when hydrofoils are incorporated into typical catamaran hull forms. This is accomplished through the utilization of advanced Computing Fluid Dynamics (CFD) simulations. In this study, a Delft-372 catamaran with a concept design is modified by installing a foil system with a high Reynolds number in order to reduce its overall resistance. The new system is then analyzed in order to determine the impact that it has on interference factors. For the purpose of achieving a comprehensive understanding of hydrodynamic behavior, the simulations are carried out under a variety of operating conditions, which include a variety of speeds. Simulations result indicate that the interference factor consistently increases drag for hydrofoil-supported catamarans to more than double that of monohulls across all speeds, particularly when hydrofoil-induced flow disturbances adversely affect the hull's boundary layer, leading to reduced efficiency.
Numerical Simulation of Sloshing in Different Tank shape with Vertical and Horizontal Baffle Using Smoothed Particle Hydrodynamics Trimulyono, Andi; Adietya, Berlian Arswendo; Alvianto, Jodhy Irsyad; Chrismianto, Deddy; Syahab, Husein
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.64288

Abstract

Computational Fluid Dynamics (CFD) is a numerical analysis used to solve problems related to free surface flows. Two major methods have been developed in the CFD, mesh-based and meshless CFD, in this paper. The meshless CFD approach, Smoothed Particle Hydrodynamics (SPH), is employed. SPH is a meshless method where each fluid is represented by a point or particle. In this study, a 3D simulation was carried out for the phenomenon of sloshing with roll motion in prismatic, square, cylindrical and spherical tanks with a duration of sloshing of 28 seconds. The filling ratio was 25% for all tanks used in this study. Vertical and horizontal baffles were also used to suppress the sloshing. The ratio height of the vertical baffle is 0.9, and the horizontal baffle is 0.2. The results of this study show a successful comparison of dynamic pressure, free surface heights, forces, and moments in various tank variations. The installation of baffles in the tank influences the sloshing phenomenon, especially in the use of vertical baffles, where the vertical baffle is the most effective baffle used in all tanks.
Analisis Pengaruh Variasi Sudut Antar Mooring Lines Terhadap Olah Gerak Floating Production Storage and Offloading (FPSO) Dengan Sistem Tambat Spread Mooring Putra, Rico Ade; Chrismianto, Deddy; Trimulyono, Andi
Jurnal Teknik Perkapalan Vol 11, No 4 (2023): Oktober
Publisher : Diponegoro University

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Abstract

Struktur lepas pantai berada dalam posisi tetap selama bertahun-tahun dan harus mampu menahan lingkungan yang keras. Dalam kondisi lingkungan aktual, analisis olah gerak FPSO berbasis data lingkungan aktual diperlukan untuk secara akurat menentukan  atau memprediksi seakeeping FPSO sebelum operasi lepas pantai. Penelitian mengenai olah gerak FPSO sudah banyak dilakukan tetapi sebagian besar hanya berfokus pada struktur free surface saja. Pada kenyataannya, FPSO merupakan struktur yang perlu ditopang dengan sistem tambatan (mooring). Pada penelitian ini, penulis melakukan penelitian mengeani pengaruh variasi sudut antar mooring lines terhadap olah gerak FPSO dengan 3 variasi sudut antar mooring lines. Analisis lanjutan berupa rekapitulasi dan pemeringkatan skenario sudut antar mooring lines. Penulis melakukan perhitungan olah gerak dan memodelkan mooring lines menggunakan bantuan perangkat lunak perkapalan. Hasil penelitian menunjukkan bahwa rolling terbaik ditunjukkan pada skenario III dengan RAO 17,0553 0/m. Pitching terbaik ditunjukkan pada skenario II dengan RAO 0,6805 0/m. Yawing terbaik ditunjukkan pada skenario I dengan RAO 0,3901 0/m. Surge terbaik ditunjukkan pada skenario III dengan RAO 0,7506 m/m. Sway terbaik ditunjukkan pada skenario II dengan RAO 0,8252 m/m.  Heave terbaik ditunjukkan pada skenario II dengan RAO 1,6365 m/m. Hasil rekapitulasi menunjukkan bahwa sudut antar mooring lines sebesar 40 menduduki peringkat pertama dengan 13 poin.
Co-Authors A.F. Zakki Agil Arianda Alkhudry Ahmad Fauzan Zakki Ahmad Firdhaus Al Ma'rif, La Ode Muh. Ayi Alfaruqi, Malik Alfi Fairuz Asna Alif Fauzan Rachmat Alvianto, Jodhy Irsyad Alviskarahma, Keizha Andy Wibowo Ari Wibawa B.S Ari Wibawa Budi Santosa Ari Wibawa Budi Santosa Ari Widyatmoko Ariani, Betty Arifuddin, Andi Mursid Nugraha Ariq Fadhlurrahman Rahardjo Ashoka Wira Parama Arta Awali , Jatmoko Azis Anjas Nugroho, Azis Anjas Aziz Abdurohman Bahtiar, Muhammad Hafids Bandi Sasmito Benny Syahputra Berlian Arswendo A Berlian Arswendo Adietya Betty Ariani Burhanuddin Putra Nirwana Daviensya Giovancha Anabel Malingkas Deddy Chrismianto Deddy Chrismianto Dedi Budi Purwanto Desto Pradika Putra Eko Didik Purwanto, Eko Didik Eko Sasmito Hadi Eko Sasmito Hadi Farhana, Annisa Firnandito, Anugrah Gary Simon good rindho Good Rindo Hafizh, Muhammad Nur Abdullah Hanyfah, Dewinta Roebiyana Hanzallahh, Muhammad Thareq Fajri Hartono Yudo Herbet Simbolon Hutabarat, Marcelino Gabriel Ignasius Sihotang Ilham Abror Imam Pujo Mulyatno Imam Pujo Mulyatno Iqbal, Muhammad Faiq Jatmiko, Arif Budi Kiryanto Kiryanto Kiryanto Kiryanto Kurniawati, Diniar Mungil Kurrohman, Faik Kusuma, Andhi Indira Luthfi Maslul Muttaqim M. Angger Kalingga M. Nurul Hidayat M. Ulil Anwar Mc. Fazjeri Ubaidilah Moh. Resi Trimulya S Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Luqman Hakim, Muhammad Luqman Musfar, Rafi Faiqal Mustofa, Dandy Ali Nadhila Shabrina Riyanto Nadzirun Bin Basir, Nadzirun Bin Nanang Zarma Nico Dwiprasti Anando Nurul Huda Nyawa, Dewa Anjar Ocid Mursid Ocid Mursid Parlindungan Manik Parlindungan Manik Putra, Rico Ade Rifat Al Farid Riyanto, Nadhila Shabrina Rohimsyah, Fikan Mubarok Ryan Andriawan Ryan Andriawan S. Samuel Saadiyah, Devy Setiorini Safitri, Laela Sam Timoty Frans Evan S. Samsu Dlukha N Samuel . Samuel Febriary Khristyson Samuel Febriary Khristyson Samuel Samuel Samuel Samuel Samuel, S Sarjito Joko Sisworo Sarjito Joko Sisworo Septyawan Bintar Saputra Subekti, Joko Sukanto Jatmiko Susatyo, Fadhly Aldilas Syafrillia, Dewi Syahab, Husein Syaiful Tambah Putra Ahmad Taufik Hidayat Taufiq Hidayah Theonov S Nainggolan Untung Budiarto Wahyu Dwi Yunanto Wahyu Masykuri Al Hakim Wahyu Ramadhani, Wahyu Wahyu Wibowo Wahyuda, Wahyuda Wasisto Rakhmadi Weslee, Chalvin Wicaksono, Ardhana Widjaja, Raden Sjarief Widya Rahman Fitriadi Widyatmoko, Ari Wilma Amiruddin Yahdun, Finodya Yohanes Aditya Yudhistira Dwi Putra Yupiter, Frengki Zaenal Abidin Zeinurrohman, Rangga