Gunawan, Nico (2006) Optimasi Kombinasi Ferrite Cores Dalam Impeder Case Untuk Meminimalkan Biaya Pada Teknologi High Induction Frequency Welding. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perusahaan pipa baja menggunakan teknologi high induction frequency welding, di mana dalam proses pengelasan tersebut digunakan work coil dan impeder untuk menghasilkan induksi guna penyambungan kedua ujung strip pada proses pembuatan pipa. Kombinasi ferrite cores dalam impeder sangat memengaruhi biaya yang dikeluarkan dan induksi yang dihasilkan. Oleh karena itu, kombinasi ferrite cores harus benar-benar diperhatikan sehingga induksi yang dihasilkan cukup baik dengan biaya seminimum mungkin. Guna mendapatkan kombinasi ferrite cores yang memberikan induksi tertentu dengan biaya yang seminimum mungkin, dalam penelitian ini akan digunakan model binary integer programming. Variabel keputusan yang digunakan adalah kombinasi ferrite cores pada diameter impeder case tertentu, yang dipilih berdasarkan kebutuhan induksi tertentu, dengan mengatur model kombinasi, layer kombinasi, diameter cores maksimal, dan konfigurasi susunan. Kemudian, dari variabel keputusan dibuat suatu model matematis dengan fungsi tujuan meminimumkan biaya dengan batasan-batasan, seperti batasan nilai induksi yang harus dipenuhi, batasan konfigurasi susunan (pada model, layer, dan diameter tertentu), batasan hubungan antarlayer, batasan layer (pada model dan konfigurasi tertentu), dan batasan jumlah pembelian minimum material ferrite core. Hasil yang diperoleh dari penelitian ini adalah biaya minimal sebesar US$ 50,18 per satuan impeder. Biaya material ferrite cores untuk setiap impeder juga mengalami penurunan sebesar 43,4% dari biaya rata-rata untuk setiap impeder yang dikeluarkan berdasarkan data yang diperoleh dari periode Januari sampai dengan April 2006.
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Steel pipe manufacturing companies use high induction frequency welding in conducting the welding process. Work coil and impeder are used to produce induction to weld two edges of the metal sheet into a pipe. The combination of various ferrite cores in the impeder case significantly affects the material cost and the induction produced. Therefore, the combination of ferrite cores is an important factor that should be determined so that it results in the required level of induction at minimum cost. To determine the optimal combination of ferrite cores, a binary integer programming model will be used in this research. The decision variable is defined as the combination of ferrite cores in a certain diameter of impeder case, which is selected based on the minimum required level of induction by arranging the combination model, layer, maximum core diameter, and configuration. A mathematical model is then created with the objective of minimizing cost and consists of several constraints, such as the minimum induction value that must be fulfilled, only one configuration selected from a certain model, layer, and diameter, the linkage between layers in a certain model, only one configuration selected in a certain layer from all models, and the minimum purchasing lot size of ferrite cores. The result achieved in this research is a minimum cost of US$ 50.18 for each impeder. The ferrite core material cost for each impeder also decreased by 43.4% from the average ferrite material cost based on data collected from January to April 2006.
| Item Type: | Thesis (Masters) |
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| Additional Information: | RTMT 671.520 151 18 Gun o |
| Uncontrolled Keywords: | ferrite cores, induksi, integer programming, ferrite cores, induction, integer programming |
| Subjects: | Q Science > QC Physics > QC766.F3 Ferrites |
| Divisions: | Interdisciplinary School of Management and Technology (SIMT) > 61101-Master of Technology Management (MMT) |
| Depositing User: | magang . |
| Date Deposited: | 17 Sep 2026 01:49 |
| Last Modified: | 17 Sep 2026 01:49 |
| URI: | http://repository.its.ac.id/id/eprint/144598 |
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