Claim Missing Document
Check
Articles

Found 4 Documents
Search
Journal : specta journal of technology

Analisa Perhitungan Pekerjaan Reparasi Kapal Dengan Metode Critical Path Method (CPM): cpm Alamsyah bin Muh. Saleh Alam Muhammad
SPECTA Journal of Technology Vol. 4 No. 1 (2020): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.928 KB) | DOI: 10.35718/specta.v4i1.172

Abstract

Meranti Nusa Bahari carries out two types of businesses, firstly ship repair and secondly ship building services. Technical analysis of ship repair work using a simple table method. The purpose of this research is to find out how long the ship repairs. The method used is CPM (Critical Path Method). The results of this research are technical analysis of work using a simple table that is able to repair one unit of ship within 22 working days and 20 ships in a year. While the analysis with CPM method found 18 working days per unit of ship and 25 units of ships in a year. There has been a decrease in working time per ship unit of 4 working days which can be used to work on other vessels, with an increase in the number of vessels of 4~5 ships in a year where there is an increase in repair productivity by 20%.
Analisa Kekuatan Bracket Pada Kapal Ro-Ro Menggunakan Aplikasi Finite Element Alamsyah Alamsyah; Amalia Ika Wulandari; Bimo Harseno Ramadhan
SPECTA Journal of Technology Vol. 4 No. 3 (2020): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (504.244 KB) | DOI: 10.35718/specta.v4i3.218

Abstract

In the transverse frame of the ferry ro-ro, there is a construction of the amplifier called the bracket contained on the car deck. The bracket construction functions to connect 2 (two) other constructions such as transferred deck beam and frame. The purpose of this study is to determine the strength of the bracket against the maximum work stress that occurs after being compressed. The method used is a finite element analysis with the help of finite element based applications. On the bracket, modulus optimization will be carried out to approach yield strength after being subjected to deck loads and ship side loads. The results showed that the solid bracket had a modulus of wsolid = 1485.168 cm3, while the cross-section modulus of the bracket with a circle hole diameter 60 mm w60 = 1463.973 cm3, a bracket with a circle hole diameter 70 mm was w70 = 1451.511 cm3, and a bracket with a diameter circle hole 75 mm is w75 = 1443.771 cm3. Maximum working stress that occurs in solid brackets is σmax solid = 92.0871 N/mm2, with holes 60 mm ie σmax d60 = 96.6237 N/mm2, and with holes 70 mm ie σmax d70 = 155.999 N/mm2, does not exceed yield stress (σmax < σy = 250 N/mm2). While the bracket tension with the hole 75 mm is σmax d75 = 272.861 N/mm2, exceeding the yield stress (σmax < σy = 250 N/mm2). So that the perforation on bracket construction can be done only on diameter sizes d = 60 mm and 70 mm. This information can minimize the use of steel material that has an effect on the ship's steel weight calculation.
Kajian Kekuatan Pontoon Lift Dengan Penambahan Upper Deck dan Lower Deck Menggunakan Metode SFBM Mangapoi E.H.A. Purba; Alamsyah, S.T., M.T.; Wira Setiawan, S.T., M.T.
SPECTA Journal of Technology Vol. 6 No. 1 (2022): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1576.462 KB) | DOI: 10.35718/specta.v6i1.331

Abstract

Paper ini membahas tentang kekuatan poonton lift setelah ditambahkan upper deck dan lower deck yang berfungsi sebagai lantai penunjang yang menjadi pijakan para worker ketika reparasi kapal dilakukan di atas poonton lift. Tujuan penelitian ini mengetahui nilai kekuatan poonton lift setelah dilakukan penambahan lantai penunjang dengan memperhatikan faktor safety kontruksi. Metode yang digunakan adalah Shear Force Bending Momen (SFBM) dengan pendekatan numerik. Hasil penelitian yang didapatkan bahwa untuk ukuran lower deck yang tepat pada poonton lift yakni lebar 7.082 m dengan ketebalan plat 8 mm dan menggunakan penampang profil berukuran L 100x65x11. Sedangkan untuk ukuran upper deck yang tepat memiliki lebar masing masing 1.46 m pada sisi kiri dan sisi kanan, ketebalan plat 7 mm, serta memiliki profil berukuran L 180x90x10. Pada konstruksi poonton lift untuk masing-masing skenario operasi dideteksi tegangan maksimum dengan skenaria berisi muatan kapal (σ) = 107.17 MPa pada bottom dan (σ) = 214.56 MPa pada deck. Sedangkan tegangan maksimum dideteksi dengan skenario tanpa muatan kapal yakni (σ) = 57.66 MPa pada bottom dan (σ) = 115.45 MPa pada deck. Untuk nilai safety factor pontoon lift setelah penambahan upper deck dan lower deck didapatkan relatif aman karena berada pada nilai minimum 1.29.
Hull Strength Investigation of Traditional Boat “Sandeq” Using Numerical Experiment: English Andi Mursid Nugraha Arifuddin; Alamsyah; Muhammad Uswah Pawara; Rodlian Jamal Ikhwani; Agus Budianto; Irfan Fadillah
SPECTA Journal of Technology Vol. 6 No. 2 (2022): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (823.13 KB) | DOI: 10.35718/specta.v6i2.492

Abstract

Sandeq is an Indonesian traditional boat that is built instead of applying principal spiral design and technical calculation in its design and construction. Its construction relies on the inherited skills of the builders. This study aims to investigate the structural strength of the boat with numerical experiments by computer software that applying the finite element method (FEM). Longitudinal and transversal hull strength will be examined for four Sandeg models. The computational model of the boat hull has been designed and run with varieties of hull lengths using the software. The simulation results showed that the obtained longitudinal and transversal stresses were less than the allowable stress of the material based on the classification rules. In the transversal strength analysis, the ratio of working stress to material stress was 6,37%, 7,20%, and 5,98% on the sandeq A, B, and C respectively. As for longitudinal stress in hogging condition, the ratio was 2,77% 3,35%, 0,93%, and 0,72% on the sandeq A, B, C, and D respectively. for sagging condition, the ratio was 2,11%, 2,49%, 0,52%, and 0,69%.
Co-Authors Abrari Noor Hasmi Ade Ray Siahaan Adhy Rahmat Agus Budianto Aknul Ciptiandi Alan Dicky Swans Saragih Amalia Ika Wulandari Amalia Ika Wulandari Amalia Ika Wulandari Andi Mursid Nugraha Arifuddin Andi Mursyid Nugraha Arifuddin Anggoronadhi Dianiswara Ardhi Hidayatullah Ardhi Hidayatullah Arif Nur Iskandar Arwis Irmandana Asram Dio Pratama Bebeto Fandi Birana Bimo Harseno Ramadhan Chris Jeremy Verian Sitorus Christian Hendra Gonawan Cindy Lionita Agusty Cindy Lionita Agusty Cindy Lionita Agusty Daeng Paroka Daeng Paroka Destyariani Liana Putri Dimas Fajar Prasetyo Elyazha D. C. Faisal Mahmuddin Faisal Mahmuddin Faisal Mahmuddin Fernanda Wahyu Pratama Feston Sandi Paribang Habibi Habibi Habibi Habibi Habibi Habibi Handika Sanjaya Sitanggang Handika Sanjaya Sitanggang Harifuddin Harifuddin Hariyono Hariyono Hariyono Hariyono Harlian Kustiwansa Husein Syahab Husein Syahab Irfan Fadillah Irham Bahri Irvan Setiawan Ivan Fadilah Jamal Jamal Jusma Wahidah M. Rusydi Alwi M. Uswah Pawara Mangapoi E.H.A. Purba Merlistyo Driantama Arwan Muh. Reza Fachrul Jaya Muh. Reza Fachrul Jaya Muhammad Anjas Syam Muhammad Anjas Syam Muhammad Dipo Nugroho Muhammad Fikri Fadlurrahman Muhammad Nuzhand Muhammad Syarif Muhammad Yusuf Al-Hafidz Nurbaya Nurbaya Nurbaya Raditya, Muhammad Yogi Rifai, Muhammad Rizky Risaldo Rodlian Jamal Ikhwani Ryan Raruk Ryo Herlambang Samsu Dlukha N Samsu Dlukha Nurcholik Septiany Tri Pangestu Setiawan, Wira Sherly Clara Suardi Huda Suardi Suardi Suardi Suardi Taufik Hidayat Wahyu Dhono Saputra Wardina Suwedy Widya Yulia Astin Wira Setiawan Wira Setiawan Wira Setiawan Wira Setiawan Zen Zulkarnaen