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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) Warta Penelitian Perhubungan
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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Investigation of The Effect Hullvane and Bow Foil on Flat-Hull Ship Using CFD Approach Andi Trimulyono; Wahyu Ananda; Kiryanto Ananda; Ari Wibawa Budi Santosa
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 1 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i1.5530

Abstract

The flat-hull ship design is an innovative concept that saves costs and speed-up the fabrication of the ship. Even though the flat-hull ship was hydrodynamically inefficient, some shipowners probably experienced an issue with its unusual shape and disadvantages where drag is greater than that of conventional ships. This paper aimed to improve the design of a flat-hull vessel using hull vane and bow foil to reduce ship resistance. The asymmetric foil NACA 4412 and 0012 were used for the hull vane. For bow foil, only NACA 4412 is used. In addition, the angle of the strut of the hull vane was varied to find out the effect to ship resistance. This study was performed in a numerical approach using computational fluid dynamics (CFD). The mesh-based CFD with RANSE solver was used in this study, and numerical analysis will be conducted to determine ship resistance of flat-hull ships with hull-vane and bow foil. It was found that the effectiveness of hull vanes on ships failed to improve resistance for flat-hulled vessels. Because of the addition of the WSA on the ship, the total resistance of the ship increases following the installation of the hull vane. As an alternative, using bow foil can reduce ship resistance at Fn 0.44 and 0.59 by 10% and 24%, respectively.
Productivity Analysis Using the Critical Chain Project Method Management (CCPM) on Repair Projects Geomarin-III ship 649 DWT. Ari Wibawa Budi Santosa; Ocid Mursid; Muhamad Angger Kalingga; Syaiful Tambah Putra Ahmad; Andi Trimulyono
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 1 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i1.5531

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.
Investigation of Planing Hull Resistance Calculation Using Smoothed Particle Hydrodynamics Andi Trimulyono; Muhammad Fajar Nuralam; Deddy Chrismianto; Samuel; Imam Pujo Mulyatno; Muhammad Iqbal
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6373

Abstract

Over the decades, advancements in computer technology have significantly contributed to the development of numerical methods, including computational fluid dynamics (CFD). CFD encompasses two primary approaches: mesh-based and mesh-free methods. While mesh-based methods are well-established and widely used for analyzing free-surface flows, such as ship resistance, mesh-free methods like smoothed particle hydrodynamics (SPH) have gained traction in real-world engineering applications. Despite its growing use, limited research has explored the application of SPH to ship resistance analysis. This study investigates the total ship resistance of a planing hull using the open-source SPH solver DualSPHysics. The research focuses on analyzing spray patterns and complex flow dynamics around the hull. DualSPHysics typically employs dynamic boundary conditions (DBC) as its standard boundary definition method. However, this study utilizes an advanced implementation of DBC, known as Modified Dynamic Boundary Conditions (mDBC), in conjunction with Project Chrono for enhanced simulation accuracy. The results demonstrate that SPH provides acceptable accuracy when compared to the Strip theory approach. Additionally, key parameters such as total force, sinkage, and trim are effectively reproduced using Project Chrono. This research highlights the potential of SPH, particularly with advanced boundary conditions, for ship resistance analysis and contributes to the growing body of knowledge in this field.
INOVASI TEKNOLOGI TEPAT GUNA DALAM RANTAI PRODUKSI KOPI PINANGGIH Solikhin, Solikhin; Wicaksono, Purnawan Adi; Sasmito Hadi, Eko; Trimulyono, Andi; Iqbal, Muhammad; Setyawan, Agus
Jurnal Pasopati Vol 8, No 1 (2026): Februari
Publisher : Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/pasopati.2026.30167

Abstract

UKM Kopi Pinanggih di Desa Kebondowo, Kecamatan Banyubiru, Kabupaten Semarang merupakan produsen kopi robusta dengan ciri khas aroma gula aren. Namun, pengelolaan produksi kopi menghadapi berbagai kendala, mulai dari keterbatasan teknologi pascapanen, biaya operasional yang tinggi akibat ketergantungan pada jasa sewa, hingga belum optimalnya pemanfaatan limbah kopi. Melalui pendampingan Tim PKUM Universitas Diponegoro, diterapkan serangkaian inovasi berbasis teknologi tepat guna yang meliputi manajemen inventory, pemanfaatan limbah, penggunaan green house untuk pengeringan, mesin huller, mesin roasting, serta mesin grinder listrik. Hasil penerapan menunjukkan peningkatan signifikan pada kapasitas produksi dan kualitas kopi. Teknologi green house mempercepat proses penjemuran dari 7–14 hari menjadi 4–8 hari dengan kualitas higienis lebih baik. Mesin huller meningkatkan produksi green bean hampir 100% dan mengurangi biaya produksi Rp1.000/kg. Mesin roasting menekan biaya operasional hingga 80% dan meningkatkan produksi 33%, sedangkan mesin grinder meningkatkan kapasitas produksi 66% sekaligus membuka peluang jasa grinding kopi. Pemanfaatan limbah sebagai parfum essen, pakan ternak, dan kompos mendukung prinsip keberlanjutan lingkungan. Secara keseluruhan, penerapan teknologi tepat guna tidak hanya meningkatkan efisiensi dan produktivitas, tetapi juga membuka peluang usaha baru, memberdayakan masyarakat sekitar, serta memperkuat daya saing Kopi Pinanggih sebagai produk unggulan lokal. Temuan ini menegaskan pentingnya sinergi antara teknologi, masyarakat, dan lingkungan dalam pengembangan UKM berbasis potensi daerah.
Co-Authors A.F. Zakki Agil Arianda Alkhudry Agus Setyawan 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 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 Ananda 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 Muhamad Angger Kalingga Muhammad Fajar Nuralam 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 Ocid Mursid Parlindungan Manik Parlindungan Manik Purnawan Adi Wicaksono 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 . Samuel Febriary Khristyson Samuel Febriary Khristyson Samuel Samuel Samuel Samuel Samuel, S Sarjito Joko Sisworo Sarjito Joko Sisworo Septyawan Bintar Saputra Solikhin Solikhin Subekti, Joko Sukanto Jatmiko Susatyo, Fadhly Aldilas Syafrillia, Dewi Syahab, Husein Syaiful Tambah Putra Ahmad Syaiful Tambah Putra Ahmad Taufik Hidayat Taufiq Hidayah Theonov S Nainggolan Untung Budiarto Untung Budiarto Wahyu Ananda 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