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Jurnal Jalasena
Published by Universitas Karimun
ISSN : -     EISSN : 26866544     DOI : https://doi.org/10.51742/jalasena.v3i1.364
Core Subject : Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
jurnal jalasena merupakan jurnal ilmiah yang diterbitkan oleh program studi teknik perkapalan universitas karimun dengan fokus penelitian struktur dan permesinan kapal, hidrodinamika, material kelautan, transportasi laut, ocean renewable energy, manajemen galangan, ekonomi maritim.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Vol 4 No 2 (2023): FEBRUARI 2023" : 6 Documents clear
PERENCANAAN PENGECATAN PADA DERMAGA APUNG KAPAL SELAM DI DAERAH NATUNA DENGAN MENGGUNAKAN CPM PDM PERT (STUDI KASUS PT. WAHYU AGUNG) Adam Erlanda Syarif Dzaky Adam; Intan Baroroh
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.864

Abstract

In the floating dock construction project, it is required to work quickly according to schedule Project planning frequently does not go as expected when floating dock construction projects are carried out. Therefore, the conditions of the shipyard are followed when planning the construction of a floating wharf. In this study, Pontoon 2 at PT. Great Revelation's submarine floating dock will be painted, and its painting will be analyzed using the CPM PDM PERT method. The three methods' networks were planned, and the Project Evaluation and Review Technique (PERT) method's results showed that it took less time overall. The planning model created by the researchers only took 43.81 hours, and it had a 99.31% chance of successfully painting the floating dock. Because the PERT method has three time variances to achieve the expected time, it can be said that it can be used in one project activity in detail.
PENGARUH HOLDING TIME PADA BAJA ST 40 DENGAN PENGELASAN FCAW TERHADAP UJI TARIK DAN KEKERASAN Hyang Adhyawantara; Nur Yanu Nugroho
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.869

Abstract

Welding is a process of joining metal objects using heat energy. In the welding process there is a problem that arises due to the uneven use of heat energy, namely residual stress, residual stress can cause cracks or defects in the weld. To reduce the risk of residual stresses forming in the joint area (HAZ) it can be carried out with the Post weld heat treatment (PWHT) process or the heat treatment process on the material after undergoing the welding process. This research was conducted to determine the effect of PWHT holding time variations on mechanical properties and also aims to determine how much holding time is appropriate for ST40 steel. In this study the PWHT temperature used was 875º C with 3 variations of holding time (45 minutes, 60 minutes and 75 minutes). Welding uses the FCAW (Flux-Cored Arc Welding) method with a 60º V seam and 1G position. Welding results are tested by tensile test and hardness test. From the results of the tensile test the best value was obtained at 60 minutes Holding Time of 384.5 MPa. The best hardness value was obtained by Holding Time 75 minutes of 137.8 HVN in the weld metal area.
SIFAT MEKANIK ALUMINIUM 5052 PADA PENGELASAN MIG DENGAN VARIASI UKURAN BACKING CERAMIC Evhardi Danang Susatyo; Nur Yanu Nugroho
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.873

Abstract

In the modern world, the use of aluminum in the field of construction has often been encountered, including in the field of ship construction. When the welding process is on large construction structures such as ships, it sometimes requires a back and forth welding process, therefore a media in the form of a ceramic backing is used as a support and prints the results of the weld for better results. Using this ceramic backing can save budget and can speed up the work process. From the discussion above, it is necessary to conduct research on the effect of ceramic backing diameter on Aluminum 5052 welding using the MIG (Metal Inert Gas) welding process with a diameter ratio of 6mm, 12mm and 14mm, which aims to compare the results of welding on tensile strength, bending strength, macrographic observation, and penetrant testing. From the results of the Tensile test, the highest average value was obtained for the 6mm Ceramic Backing variation of 64.94 Mpa. From the results of the bending test the best results were obtained on the 14mm Ceramic Backing variation with the minimum crack results of 0.4mm. From the results of the penetrant test, the best results were found in the 12mm Ceramic Backing variation, only 1 rounded of 0.6mm was found. From the results of the macrographic test the best results were found in the 12mm Ceramic Backing variation because there were minimal defects found in the welds.
LAMINASI KAYU MAHONI DAN KAYU JATI SEBAGAI BAHAN ALTERNATIF PEMBANGUNAN KAPAL IKAN Ryan Andicha Firmansyah; Akhmad Basuki Widodo
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.875

Abstract

Penelitian ini memiliki tujuan untuk menganalisis Teknik Pembangunan Kapal Ikan Tradisional Dengan Teknologi LaminasiKayu Mahoni Dan Kayu Jati. Objekyang dijadikan dalam penelitian ini ialah kapal kayu penangkap ikan tradisional ukuran.Penelitian ini menggunakan material laminasi kayu mahoni dan kayu jatiyang digunakan untuk spesimen uji. Tumpukanlaminasi kayu mahoni yangdigunakan menggunakan tumpukan bata (Strip). Lem yang digunakan untuklaminasi yaitumenggunakan lem Epoxy Resin Marine Use. Standar konstruksi untuk laminasi kapal kayu berdasarkan standar pengujiankekuatan laminasiberdasarkan JIS (Japan Insdustried Standart). Hasil dari pengujian menunjukkanbahawa untuk spesimenyang menggunakan ½ kayu mahoni ½ kayu jati memilikinilai rata-rata yang rendah yaitu sebesar 101.98 kg/cm². sedangkanuntuk nilai rata-rata tertinggi pada pengujian ini yaitu varian spesimen berkode SJDM atau varian spesimen 1/3 kayu jati2/3 kayu mahoni dengan nilai rata-rata sebesar 180.15 kg/cm². Sedangkan untuk varian laminasi dengan kode SMDJmemperolehnilai rata-rata sebesar 142.77 kg/cm². varian dengan komposisi ini merupakan varian yang memiliki komposisi2/3 Kayu jati Dan 1/3 Kayu mahoni.
ANALISA PENGARUH VARIASI BULBOUS BOW JENIS HIU MARTIL TERHADAP HAMBATAN KAPAL Ade Brahma Marcelino Aplugi
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.876

Abstract

Ship resistance is a topic that is still being discussed at this time, everyone who has knowledge in the field of shipping is competing to minimize the resistance that occur in the ship's hull. At this time there have been many innovations regarding hull design that can evaluate ship resistance, for example bulbous bows, stern flaps, skeg and so on. Resistance that are too large will be very detrimental, starting from fuel consumption, engine durability and ship building structures. The design concept of this bulbous bow is taken from the shape of a living creature or what is usually called biomimetic engineering, this bulbous bow is shaped like the head of a hammerhead shark which has a mouth that extends horizontally. The results of the bulbous bow design concept are expected to reduce ship resistance.
ANALISA FINITE ELEMENT METHOD (FEM) UJI BEBAN PADA MEJA POLYETHYLENE Muhammad Fazly Arliansyah; Saputra saputra; Rahman Rahman; Widi Suyudi Ashari; Muhammad Zaki Prawira; Alyuan Dasira
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.877

Abstract

FEM is an overall method based on an approach using numerical analysis. In this method, the structure to be analyzed is discretized into small elements (finite elements) which are connected to each other by nodal points (discrete points). The use of FEM analysis is also commonly used with the ANSYS workbench application. The use of the table is often found in everyday life. In this study, we will test the strength of a table made of polyethylene against a load of 5000N which will be applied to the surface of the table. The results to be taken from this study are the results of the deformation and equivalent stress of the table surface. After carrying out a load test of the size of the table using the ANSYS workbench software, the maximum deformation result for the table surface is 0.0086057 or 0.008 x 1000 = 8cm. Meanwhile, the equivalent stress result was 6.99 Pascals.

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