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All Journal Majalah Ilmiah Pengkajian Industri Jurnal Teknologi Dirgantara Jurnal Teknologi Terapan Prosiding SNTTM Indonesian Journal of Aerospace
Jos Istiyanto
Department Of Mechanical Engineering, University Of Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics Transportation

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Journal : Prosiding SNTTM

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Optimasi pengurangan massa superstruktur dan hatch cover kapal ikan 5 GT Putra, Gerry Liston; Budiono, Hendri; Istiyanto, Jos
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/mkenzf29

Abstract

Indonesia sebagai salah satu negara kepulauan terbesar memiliki potensi besar di sektor maritim. Pemerintah Indonesia menempatkan industri perkapalan sebagai salah satu sektor prioritas untuk dikembangkan. Industri galangan kapal menghasilkan berbagai produk, termasuk kapal dan bangunan lepas pantai, dengan kapal ikan sebagai salah satu produk utamanya. Kapal ikan berfungsi untuk menangkap sekaligus membawa hasil tangkapan. Sebagian besar kapal ikan tradisional masih terbuat dari kayu yang membutuhkan perawatan tinggi dan biaya besar. Modernisasi kapal ikan dengan penggunaan material seperti baja, aluminium 5083, dan HDPE menjadi penting untuk meningkatkan daya saing nelayan.Penelitian ini mengoptimalkan bagian superstruktur dan fish hold hatch cover pada kapal ikan 5 GT menggunakan metode Finite Element Method (FEM) dan persamaan bending stress untuk mengurangi massa kapal. Hasil optimasi menunjukkan bahwa tegangan yang terjadi pada struktur tetap memenuhi standar badan klasifikasi. Optimasi menghasilkan penurunan berat yang signifikan: untuk material mild steel, penurunan berat superstruktur sebesar 45% dan hatch cover sebesar 46%. Untuk aluminium 5083, penurunan berat superstruktur sebesar 17,34% dan hatch cover sebesar 18,95%. Sebaliknya, pada material HDPE terjadi peningkatan berat struktur sebesar 78,08 kg atau sekitar 161,857% dari berat desain. Temuan ini menegaskan pentingnya pemilihan material dan ketebalan pelat yang tepat guna mencapai efisiensi optimal dalam konstruksi kapal ikan.
Towards a framework for early cost estimation based on process complexity index for machined components Hendri DS Budiono; Wahyu Purnawirawan; Jos Istiyanto; Gerry Liston Putra
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/3s21w125

Abstract

Preliminary cost estimating is a pivotal element in ascertaining the competitive viability of manufacturing sectors. The initial design phase, when comprehensive information on methods and standards remains significantly constrained, allocates approximately 70–80% of overall manufacturing expenses. This paper presents a conceptual framework for preliminary cost assessment grounded in process complexity indices, specifically targeting machined components. The framework is constructed using a modular approach comprising three primary components: CAD/CAM system, analysis module, and reference module. The CAD/CAM system module extracts geometric data from CAD models, classifies manufacturing aspects, and delineates product complexity attributes. The Analyzing Module encompasses manufacturability assessment, production duration estimation, cost calculation, and evaluations of product and process complexity. The Reference Module offers auxiliary databases, encompassing machine cost rates, labor expenses, tool specs, manufacturing process repositories, and complexity databases. The integration of these three modules facilitates more precise cost estimation, especially in the absence of specific production information. A literature analysis demonstrates that feature recognition methods—geometry-based, rule-based, graph-based, and hybrid—can be integrated to enhance this system. The suggested framework aims to enhance the dependability of early design-stage forecasts by including complexity traits into cost estimates, hence establishing a basis for the creation of more adaptive and automated cost estimation systems suited to contemporary manufacturing requirements.
Co-Authors A.A. Ketut Agung Cahyawan W Aryandi Marta bobi khoerun Budiono, Hendri Danardono Agus Sumarsono Dony Hidayat Endramawan, Tito Felix Dionisius Gerry Liston Putra Harry Purnama Hendri DS Budiono Heni Pujiastuti Hidayat, Dony Hidayat, Kurnia Jekki Hendrawan Joko Triwardono Malawat, Mohammad Marta, Aryandi Nur Rohmat, Yusup Purnama, Harry Putra, Gerry Liston Sugeng Supriadi, Sugeng Suliono Suliono Suwandi, Dedi Tito Sitanggang, Tito Wahyu Purnawirawan Wasiah, I'ah Yudan Whulanza