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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS Jurnal Ilmiah MITSU (Media Informasi Teknik Sipil Universitas Wiraraja) Briliant: Jurnal Riset dan Konseptual Teras Jurnal Astonjadro Jurnal Kelautan Nasional Jurnal Tecnoscienza International Journal of Marine Engineering Innovation and Research ABIDUMASY : Jurnal Pengabdian kepada Masyarakat Publikasi Riset Orientasi Teknik Sipil (Proteksi) Reaktom : Rekayasa Keteknikan dan Optimasi Sewagati Jurnal Terapan Pendidikan Dasar dan Menengah Jurnal Rekayasa dan Aplikasi Teknik Sipil
Totok Yulianto
Institut Teknologi Sepuluh Nopember
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Analisis Tegangan Haluan Kapal Akibat Tubrukan Nur Ahmad Dzikron; Totok Yulianto
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (214.491 KB) | DOI: 10.12962/j23373539.v8i2.45284

Abstract

Tubrukan dan karam merupakan salah satu penyebab kecelakaan yang sering terjadi pada kapal. Dampak yang terjadi akibat tubrukan kapal, yaitu dapat mengancam kehidupan manusia, lingkungan, dan investasi ekonomi. Penelitian ini dilakukan untuk mengetahui kekuatan haluan kapal serta mengetahui respon struktur konstruksinya akibat tubrukan dengan Finite Element Method (FEM). Simulasi kasus tubrukan kapal dilakukan dengan variasi kecepatan awal haluan 1 m/s, 2 m/s, dan 3 m/s selama waktu 0,05 detik. Haluan kapal mengalami deformasi plastis pada saat nilai tegangan melebihi yield strength dan mencapai ultimate strength, yaitu pada sekitar waktu 0,018 detik; 0,009 detik; dan 0,0056 untuk kecepatan awal 1 m/s; 2 m/s; dan 3 m/s. Internal Energy yang diserap oleh haluan kapal pada waktu 0,05 detik untuk kecepatan 1 m/s; 2 m/s; dan 3 m/ adalah 118,01 KJ; 672,39 KJ; dan 1501,3 KJ. Gaya maksimal yang dihasilkan pada waktu 0,05 detik untuk kecepatan awal 1 m/s adalah 10,597 MN dengan penetrasi yang terjadi adalah 39,574 mm. Untuk kecepatan awal 2 m/s, nilai gaya maksimal yang dihasilkan adalah 25,221 MN dengan penetrasi 86,998 mm. Kemudian untuk kecepatan awal 3 m/s, nilai gaya maksimal yang dihasilkan adalah 29,35 MN dengan penetrasi 134,42 mm. Nilai tegangan, internal energy, gaya, dan penetrasi yang dihasilkan semakin besar apabila kecepatan awal semakin tinggi.
KAJIAN PENENTUAN GETARAN SISTEM PROPULSI KAPAL PATROLI DENGAN METODE ELEMEN HINGGA Teguh Putranto; Asjhar Imron; Totok Yulianto
Jurnal Kelautan Nasional Vol 13, No 2 (2018): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.559 KB) | DOI: 10.15578/jkn.v13i2.6659

Abstract

Kapal patroli adalah salah satu kapal perang berkecepatan tinggi yang digunakan untuk melakukan operasi militer dalam rangka menjaga kedaulatan wilayah maritim suatu negara. Kapal patroli tidak hanya mampu beroperasi sesuai dengan targetnya tetapi juga perlu diperhatikan juga faktor kenyamanan dan keselamatan awak kapalnya. Sebelum kapal dibangun, penentuan desain dan konstruksi kapal patroli menjadi tahap yang sangat penting karena kapal cepat sering terjadi persoalan terhadap getaran kapal yang diakibatkan sistem propulsi. Penelitian ini akan mengkaji tentang metode numerik untuk menganalisa getaran sistem propulsi kapal. Finite Element Method (FEM) merupakan salah satu metode numerik untuk menyelesaikan persamaan diferensial parsial dengan cara membagi model menjadi elemen-elemen. Pemodelan numerik dilakukan pada sistem propulsi dan sebagian dari badan kapal. Untuk memulai simulasi, kondisi batas ditentukan berdasarkan posisi sekat ceruk buritan, sekat pada strut, transom, center girder, dan side girder. Setelah simulasi selesai, frekuensi alami pada mode shape 1 - 5 didapatkan sebesar 26,26; 35,68; 44,23; 90,62; 97,66 Hz secara berurutan. Frekuensi eksitasi propeller pada kecepatan dinas didapatkan sebesar 54,93 Hz dimana fungsi dari rotasi propeller dan jumlah daunnya. Frekuensi 26,26 dan 35,68 Hz (mode shape 1 dan 2) mengalami getaran ke arah lateral sedangkan frekuensi 44,23 Hz (mode shape 3) mengalami getaran ke arah vertikal. Sistem propulsi akan beresiko mengalami resonansi pada mode shape 3 ketika beroperasi pada kecepatan 25 knot.
Influence of Stress Concentration Factor due to Scallop Form on the Wrang Plate Stucture Riska Arum Dona Kusnadi Putri; Totok Yulianto; Rizky Chandra Ariesta; Mohammad Nurul Misbah
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 1 (2022): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i1.43344

Abstract

The presence of opening in construction is unavoidable for the purpose of reducing stress. A small opening at the construction serves as access to continue the installed construction that runs through the web or girder. However, the presence of the hole also creates an unavoidable problem, the concentration of stress in the area around the hole that will gradually reduce the strength of the ship's construction. Stress concentration occurs due to changes in geometry, causing the flow of stress initially uniformly driven and following the existing geometry. This analysis aims to determine the value of stress concentration factors on the wrang plate due to variations in the shape of scallops. The research method is performed numerically using finite element analysis to find variations in the model with the lowest stress concentration factor. This variation consists of 3 different scallops models with 2 load, drag and press conditions. The values of stress concentration factors are grouped into 3 modes according to mechanical fractures in press loading conditions. Based on the analysis of panel models with compressed loads, it can be seen that model III has the smallest stress concentration factor value in case modes I and III but for mode II the value of the smallest stress concentration factor in model II.
Reliability Analysis of Passenger Ship Structure Conversion in Bali Straits Rizky Chandra Ariesta; Aries Sulisetyono; Totok Yulianto; Elwas Cahya Wahyu Pribadi
International Journal of Marine Engineering Innovation and Research Vol 7, No 4 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i4.14749

Abstract

LCT conversion passenger ships have been widely operated in the waters of the Bali Strait. Ship operations in the Bali Strait result in repeated loads on the structure. Repeated loading produces vertical and horizontal bending moments that act randomly due to waves. Based on this, it is necessary to analyze the structure of the ship. The purpose of this study was to analyze the reliability value of the ship structure operating in undulating waters. Wave analysis is performed using the spectral method to determine the value of the load acting on the ship, while the reliability calculation uses the Mean Value First Order Second Moment (MVFOSM) method to determine the reliability value. The analysis was carried out on a full load and an empty load. The value of the reliability of the structure at full load is 0.913615 and at empty load is 0.88948.
Comparative Analysis of Slamming Phenomenon Prediction between U and V Hulls using Strip Theory Method Muhammad Luqman Hakim; Ahmad Firdaus; Gita Marina Ahadyanti; Totok Yulianto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.46805

Abstract

Choosing the right hull shape is important in designing a ship, for example, a U-section or V-section of the hull. The hull shape will affect various aspects, such as design, resistance, seakeeping, structure and production. The ship hull must be properly designed so that it can operate according to the ship’s mission. From the seakeeping aspect of the ship's motion at sea, the difference in the hull shape will result in different motions and dynamic effects such as the slamming phenomenon. Based on the difference in the hull shape cases, this study analyzed the difference in the probability of slamming between the U and V hulls. Both hulls were made based on Formdata and almost all parameters were made the same. Parameters that cannot be forced to be the same are WSA (wetted surface area),  (coefficient of waterplane area), and  (distance of keel to buoyancy), where those parameters determine the difference in the results. The calculation of RAO (operator amplitude response) was obtained using the strip theory method which assisted by Maxsurf Motion software. The results became the input for the calculation of the slamming probability. The study results show that the U hull has a higher probability of slamming occurrence than that of the V hull, with the difference in values ranging from 20% to 35%. Therefore, the U hull will get more frequent slamming loads, so it has the potential to have a higher structural failure (fatigue) than that of the V hull.
Design and Manufacture Ballast Management System Model for Reduce Ship Rolling Motion Yulianto, Totok; Hermawan, Yuda Apri; Widjaja, Raden Sjarief; Purwanto, Dedi Budi; Sulaiman, Suardi bin; Rahmi, Lista Putri Adinda
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.59192

Abstract

The safety of maritime transportation is a critical aspect that must be addressed to ensure the well-being of ships and their crew. Frequent ship accidents highlight the need for improvements in the maritime transportation system. One of the causes of ship accidents is ship instability, leading to a loss of balance and even sinking. Ship stability is influenced by both internal and external factors, including human negligence in observing and addressing ship instability. This research aims to design and create a management ballast system model that can be operated automatically as a solution to reduce ship rolling motion. This system enables the ship to maintain balance using automatic side ballast tank management by utilizing two wing tanks on either side of the ship. The ballast management system will be equipped with an accurate ship roll angle detector, the Initial Measurement Unit sensor, a microcontroller, and a series of actuators, including relays as voltage control switches for the pump motor. This research involves simulation and testing/experiments at various angles, namely 5, 10, and 15 degrees. Simulations are conducted under conditions with and without the ballast management system, which is then confirmed through experiments under the same conditions. The expected outcome of this research is that the created ballast management system can be used to reduce ship rolling.
Effect of Corrosion on Steel Strength (ST. 37) Sundari, Titin; Mutrofin, Akmam; Ramadhani, Rahma; Khiyana, A'izzatul; Yulianto, Totok; Nugroho, Meriana Wahyu
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16577

Abstract

Rust on steel is often a problem in construction work. Rust occurs when iron oxidizes. The cause is prolonged exposure to water, air, or an acidic environment. Iron will bind oxygen atoms in the air to form iron oxide/rust. Rust continues to increase, accelerating the process of damage to buildings. Rust cannot be avoided, but it can control its rate. St.37 carbon steel is the most widely used material for various types of building construction. Therefore, it is necessary to carry out experimental tests regarding the rate of corrosion and its effect on the strength of steel. In this research, using St.37 steel plates, the corrosion process was carried out by leaving the specimens in an open space, immersing the specimens in sea water, and immersing the specimens in fresh water for 15 days. The aim of this research is to analyze the corrosion rate and its effect on the strength of St.37 carbon steel material. Based on the research results, the average corrosion rate of test plates in open spaces was 0 MPy with an extraordinary resistance category; soaked in sea water 14.76 MPy with good category; and soaked in fresh water 39.37 MPy with the fair category. Meanwhile, based on the tensile test results, the average strength was 560.8 MPa for objects, 510.4 MPa, and 492.8 MPa, respectively. This corrosion rate affects the strength of the steel, the greater the corrosion rate, the tensile strength of the steel plate decreases.
PENDAMPINGAN SISTEM INFORMASI BARANG BERBASIS WEB UD. ASAFA JAMUR TIRAM Muflihah, Nur; Ayu N.F.A, Fatma; Mayasari, Andhika; Sumarsono, Sumarsono; Minto, Minto; Yulianto, Totok; Rahmawan, Sulung
ABIDUMASY Vol 5 No 02 (2024): ABIDUMASY : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33752/abidumasy.v5i02.7422

Abstract

The community service program (PKM) was carried out at UD. Asafa Jamur Tiram which is a business group that produces fresh mushrooms and provides baglog growing media. Based on the results of discussions with partners, there are problems faced related to the goods information system which has been recorded manually. Business development demands that information is faster and more precise so that an efficient planning system is needed in managing and recording inventory of materials, stock of goods, finished products and information on the entry and exit of goods. Therefore, in the community service program, a web-based goods information system has been introduced which allows a centralized database and can be accessed anywhere. The implementation of PKM is carried out by first coordinating with partners to find the problems faced then planning the PKM activity program. Furthermore, compiling a guide to mentoring material, then implementing mentoring activities, and evaluating the results of the implementation of mentoring. As a result of this mentoring program, the partners were satisfied and the application of the web application could improve the management of goods and sales due to the sharing of inventory information from the central management to the lower level.
Sistem Berkelanjutan Desalinasi Air Laut dan Produksi Garam Modern dengan Tenaga Surya di Eduwisata Mutiara Saghara Putranto, Teguh; Triastuti, Warlinda Eka; Misbah, Mohammad Nurul; Yulianto, Totok; Yulianto, Ardi Nugroho; Pribadi, Sri Rejeki Wahyu; Suprapto; Ningrum, Eva Oktavia; Arief, Irfan Syarief; Ariesta, Rizky Chandra
Sewagati Vol 8 No 6 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i6.2246

Abstract

BUMDes Mutiara Saghara mengembangkan usaha baru berupa Eduwisata Garam, yaitu wisata edukasi yang memperkenalkan proses pengolahan garam rakyat secara tradisional serta inovasi modernnya. Meskipun sektor garam berpotensi meningkatkan perekonomian warga Desa Bunder, saat ini kontribusinya masih belum optimal. Akibat dari minimnya kontribusi ini, produksi garam oleh petani tidak memberikan keuntungan ekonomis yang signifikan. Untuk mengatasi permasalahan tersebut, program pengabdian kepada masyarakat ini bertujuan mengintegrasikan sistem desalinasi air laut yang menghasilkan garam dan air hasil evaporasi. Pengabdian dilakukan secara bertahap mulai dari mendesain alat, mengadakan bahan baku, membuat alat, melakukan uji alat dan menyerahkan alat kepada mitra. Dalam proses utamanya, air hasil evaporasi yang memanfaatkan panas matahari akan dialirkan melalui pipa saluran ke bak penampung dan kemudian diproses dengan teknologi reverse osmosis (RO) untuk menghasilkan air bersih. Inovasi ini diharapkan dapat meningkatkan kualitas garam dan memberikan manfaat lain yaitu dapat menghasilkan air bersih. Sistem RO dirancang dapat menghasilkan air bersih 1000 gpd.
Pengendalian Biaya dan Waktu Proyek Gedung SMK Dwija Bhakti Jombang Dengan Menggunakan Metode Earned Value Purnomo, Agus; Nugroho, Meriana Wahyu; Yulianto, Totok
JURNAL TECNOSCIENZA Vol. 4 No. 1 (2019): TECNOSCIENZA
Publisher : JURNAL TECNOSCIENZA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51158/meqzq283

Abstract

AbstrakProyek pembangunan gedung lantai 3 SMK Dwija Bhakti Jombang membutuhkan suatu manajemen proyek mulai dari fase awal hingga fase akhir. Konsep metode earned value merupakan pengendalian proyek yang menitik beratkan pada masalah waktu dan biaya. Konsep metode earned value menyajikan tiga dimensi yaitu penyelesaian fisik dari proyek (the percent complete) yang mencerminkan rencana penyerapan biaya (budgeted cost), biaya aktual yang sudah dikeluarkan atau yang disebut dengan actual cost serta apa yang didapatkan dari biaya yang sudah dikeluarkan atau yang disebut nilai hasil (earned value).Penelitian ini mempunyai tujuan untuk mengevaluasi kinerja waktu dan biaya. Berdasarkan perhitungan total minggu ke-1 sampai dengan minggu ke-17didapatkan nilai BCWS sebesar Rp. 1.575.581.000,-; Nilai total BCWP pada minggu ke-1 sampai minggu ke-16 didapatkan sebesar Rp. 1.298.295.000,-; Nilai total ACWP pada minggu ke-1 sampai minggu ke-16 didapatkan sebesar Rp. 1.325.784.000,-; Pada akhir masa peninjauan yaitu pada minggu ke-16 didapatkan nilai Estimate At Completion (EAC) proyek sebesar Rp. 1.582.187.356,-; nilai tersebut lebih dari biaya total secara keseluruhan pada minggu ke-16 sebesar Rp.1.552.086.992,-; dapat diartikan bahwa proyek tersebut mengalami kerugian. Estimasi waktu penyelesaian proyek Estimate To Completion (ETC) adalah 143 hari yang berarti proyek akan selesai lebih lama 23 hari dari waktu yang telah direncanakan 120 hari. Kata kunci: waktu, biaya, nilai hasil AbstractThe third floor building construction project of Vocational High School 3 of Dwija Bhakti Jombang needs a management project starting from the first phase up to the last phase. The earned value method concept is a project control emphasizing on the time and cost. This concept presents three dimensions, such as the physical completion of the project (the percent complete) reflecting the budgeted cost, actual cost having been used and what is got from the used cost usually called as earned value. This research has a purpose to evaluate the performance of time and cost. Based on the total calculation of week 1 up to week 17, BCWS got was Rp. 1.575.581.000,-;. The total total BCWP in week 1 up to week 16 was Rp. 1.298.295.000,-; Meanwhile the total ACWP in week 1 upto week 16 was Rp. 1.325.784.000,-;. In the end of review period or in the 16th week, the Estimate At Completion (EAC) of project was Rp. 1.582.187.356,-, which was higher than the total cost in week 16 that was Rp.1.552.086.992,-;. Thus, it can be said that this project suffered a financial loss. Then, the Estimate To Completion (ETC) of the project was 143 days which means that the project will finish 23 days longer than the planned time which is 120 days. Keywords: time, cost, earned value
Co-Authors A'izzatul Khiyana Abdiyah Amudi, Abdiyah Achmad Zubaydi Aditya Rachman Afan Hamzah, Afan Agung Prasetyo Agus Purnomo Agus Wiyono Ahmad Firdhaus Ardi Nugroho Yulianto Aries Sulisetyono Ariesta, Rizky Chandra Arif, Irfan Syarif Asjhar Imron Assoraya, Laela Akmalinda Ayu N.F.A, Fatma Daudy, Kevinaura Rachman Dedi Budi Purwanto Dedi Dwi Sanjaya Elwas Cahya Wahyu Pribadi Erik Chabibi Gita Marina Ahadyanti Hakim, Andy Luqman Hasanudin Hasanudin Hermawan, Yuda Apri Irfan Syarief Arief Irra Purnomo, Amellia Intan Putri Jonathan Hervianto Ketut Suastika Lubis, Syawaluddin Efendi M. Nurul Misbah Mayasari , Andhika Minto, Minto Mohammad Khoirul Effendi Mohammad Nurul Misbah Mohammad Nurul Misbah Mohammad Nurul Misbah Muflihah, Nur Muhamad Gifari Rusdi Muhammad Alif Budiman Muhammad Luqman Hakim Muhammad Luthfi Muharom, Restu Mutrofin, Akmam Nugroho, Meriana Wahyu Nur Ahmad Dzikron Putra, Erzad Iskandar Raden Sjarief Widjaja Rahardjo, Fadjar Wahyu Rahma Ramadhani Rahmawan, Sulung Rahmi, Lista Putri Adinda Riska Arum Dona Kusnadi Putri Rizky Chandra Ariesta Rusdiana, Dimas Katon Septia Hardy Sujiatanti Setyawan, Dony Setyawan, Dony Sintia Megawati Siswantoro, Nurhadi Sri Rejeki Wahyu Pribadi Stevanus Arie Nugroho Sujiyatanti, Septia Hardy Sulaiman, Suardi bin Sulung Rahmawan Wira Ghani Sumarsono Sumarsono Sundari, Tiitin Sundari, Titin SUPRAPTO Taufiq Taufiq Teguh Putranto Titin Sundari Utama, Danu Uun Kusnul Khotimah Warlinda Eka Triastuti Widjaja, Raden Sjarief Yuda Apri Hermawan