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INDONESIA
Jurnal Techno Bahari
Published by Politeknik Negeri Madura
ISSN : 24068829     EISSN : 27468399     DOI : -
Core Subject : Science, Engineering,
Electrical & Electronics Engineering Energy Mechanical Engineering Transportation
Focus and Scope This journal encompasses original research articles, including: Technology Science Machinery Engineering Mechanical Engineering Shipbuilding Engineering Electrical Engineering (Electronics)
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 7 Documents
 1 
Search results for , issue "Vol 4 No 1 (2017)" : 7 Documents clear
Optimasi Parameter Mesin Cnc Wirecut Terhadap Waktu Pemotongan Dengan Metode Taguchi Analysispada Material H13 Bayu Wiro Karuniawan, Ali Imron
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

CNC Wirecut machine is one of the non-conventional machining which can cutting complex shape. The cutting results are more accurate and precision, smooth but the cutting process spend more time in processing. The research uses steel H13 by using experimental design with orthogonal matrix L8(27). The process parameters are low power, arc off time, interaction of low power and arc off time, feedrate override, wire tension, water flow, which every parameter has two levels. Optimization in this research using Taguchi Analysis Method and the response that observed are cutting time. The response has characteristics Smaller is Better quality. The results of Taguchi analisys indicates that the most contribution of parameters are Low power 78.18%, Feedrate override 4.93%, Wire tension 16.27%. While Arc off time, Interaction of low power and arc off time, Water flow effect is not significant. Optimization of cutting time responses are Low power (LP) is 10 Watt, Arc off time (AFF) is 50 seconds, Feedrate override (FR) is 5 mm/sec, Wire tension (WT) is 15 N, Water flow (WF) is 7 kg/cm2.
Optimasi Proses Side Milling Dengan KarakteristikMultirespon Menggunakan Weighted Principal Component Analysis (Wpca) Dan Metode Taguchi Laily Ulfiyaha, Bobby O. P. Soepangkatb, Bambang Pramujatib
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

This paper presents the optimization of the side milling process of Al 6061, with multiple performance characteristics based on the orthogonal array with Taguchi method and Weighted Principal Component Analysis (WPCA). The experimental studies were conducted under varying side milling process variables, i.e., main axis of rotation , feed rate and radial depth of cut. The optimized multiple performance characteristics were surface roughness and tool wear. Weighted Principal Component Analysis (WPCA) has been applied to eliminate response correlation and to convert correlated responses into equal or less number of uncorrelated quality indices called principal components. Based on individual principal components a Multi-Response Performance Index (MPI) has been introduced to derive an equivalent single objective function which has been optimized (maximized) using Taguchi method. Since main axis of rotation, feed rate and radial depth of cut had three levels, the experiment design used L9 orthogonal array with replication. The quality characteristics of surface roughness and tool wear were smaller-is-better. Optimal result has been verified by confirmatory test. Experimental results have shown that machining performance in the side milling process can be improved effectively through this method. The side milling process variables which significantly affected surface roughness and tool wear are main axis of rotation and feed rate.
Penentuan Jarak Optimal Kapal Tradisional Pelayaran Rakyat Untuk Peningkatan Daya Saing Layanan Transportasi Laut Akmal Lazuardy
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

Indonesia has complicated challenge in logistics system due to the archipelagic form. It requires established logistics system with marine transportation plays important role in it. There are two types of Indonesian marine transport services: PELNAS (Pelayaran Nasional) or national shipping is a more modern transportation services. It is clear that PELNAS more preferable to consumer with its sophisticated outfitting, powerful engine, faster speed, and faster cargo handling. On the other hand, PELRA or traditional shipping is a marine transportation services up to 500 gross tonnages managed by lower economic class using traditional ship made from ironwood. Therefore, it has major limitation especially in its capacity as well as its sailing range. These two marine transportation services are in competition and, without a doubt; PELNAS excelled PELRA in any aspects. However, the fact that PELRA still existed today, might indicates that PELRA already has established small niche market in Indonesia. This research seek to determine how far its operating distance to answer why PELRA rooted specific market in order to stand a chance from competition with PELNAS. It turns out that PELRA are more cost-efficient than PELNAS under 432,05 nautical miles with critical unit cost: Rp. 9.016 ,74 per tonnemiles. This distance is equivalent to Jakarta – Surabaya (384 nautical miles), Jakarta – Palembang (355 nautical miles), and Surabaya - Sampit (360 nautical miles). The result is relevant as those routes are commonly serviced by PELRA with traditional ship rather than PELNAS with its advanced modern ship.
Pemodelan Dan Analisis Pengaruh Adanya Dead Zone Pada Damper Terhadap Respon Dinamis Dan Kenyamanan Kendaraan Auliana Diah Wilujeng, Laily Ulfiyah, Misbakhul Fatah
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

Fenomena non-linearity banyak terjadi pada shock absorber. Salah satu fenomena non-linearity terjadi pada Regenerative Shock Absorber (RSA). Pada saat rentang kecepatan tertentu, nilai konstanta redaman sama dengan nol, artinya gaya redamannya juga sama dengan nol. Karakteristik redaman seperti ini biasa disebut daerah mati (dead zone). Berawal dari karakterisik ini, penulis melakukan analisis tentang bagaimana respon dinamis dari peredam dengan karakteristik adanya daerah mati jika diaplikasikan pada kendaraan penumpang dan bagaimana kenyamanan kendaraannya. Pemodelan yang digunakan adalah seperempat kendaraan. Input yang digunakan ada dua, yaitu input step dan bump yang telah dimodifikasi yang mewakili transient respon dan input sinusoidal yang mewakili steady state respon. Adapun variabel yang divariasikan yaitu rentang kecepatan relatif antara sprung mass dan unsprung mass serta besar konstanta peredam, Cs+. Kecepatan relatif bervariasi yaitu 0,002 m/s, 0,004 m/s, dan 0,008 m/s. Sedangkan untuk Cs+ bervariasi mulai dari 350 N.s/m, 2000 N.s/m, dan 4000 N.s/m. Untuk input step dan bump yang telah dimodifikasi, terdapat pula variasi dari ? (severity parameter), yaitu 1 (low impact), 5 (severe high impact), dan 20 (more high impact). Sedangkan untuk input sinusoidal variasi hanya dilakukan pada kecepatan kendaraan 0 hingga 100 km/jam dengan interval 0.5 km/jam.Hasil yang didapat menunjukkan bahwa jika dibandingkan dengan sistem asimetri maupun simetri tanpa dead zone, keberadaan rentang dead zone tidak mempengaruhi respon dinamis kendaraan kecuali settling time-nya lebih lama seiring dengan bertambahnya rentang dead zone. Dengan kata lain, keberadaan dead zone menimbulkan ketidaknyamanan terhadap respon dinamis kendaraan. Dari segi kenyamanan ISO 2631, ketahanan pengendara terhadap sistem dead zone pada semua kombinasi yaitu lebih dari 1 jam pada frekuensi di bawah 3 Hz. Sedangkan pada respon transien, baik itu input bump maupun step, sistem asimetri dan simetri tanpa dead zone lebih nyaman daripada sistem dengan dead zone. Hal ini dapat dinyatakan dengan RDR, SDR, maupun SAR. Pada kombinasi 1, semakin kecil nilai indeks performanya, maka dapat dikatakan semakin nyaman
Perubahan Displacement Terhadap Hambatan Kapal Kayu Dengan Kapal Kayu Laminasi, Studi Kasus Kapal Ikan 1gt Nurhasanah, Muhammad Helmi, Budhi Santoso
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

Fishermen in Bengkalis is have started selecting the raw materials to become fiberglass for fishing boat. However, until recently the material of wood already there are still many that operate. Fishermen who still have enough wood of ships realize that age is not long compared to fiberglass boats that came the idea to locate the material or an alternative method that can make the wooden boat last longer. The method is carried out by laminating a wooden boat with fiberglass. Wood to be coated fiberglass mix ingredients with the same treatment lamination technique with fiberglass boats. The addition of fiberglass laminate on wood ships will certainly occur many changes in such a wood has change, displacement, Total Resistance, and power of main engine. Intense and previously known displacement of wood is 1,433 Ton and displacement of laminated is 2,004 Tons. While to know the total resistance of the ship and engine power is required, calculated using the method of Van Oortmersen because this method is most appropriate for small fishing vessels by type of fishing boat. Based on the calculation of total resistance, then obtained each change in resistance of wood is 1,14% and 3,6% for laminated of ship.
Permodelan Numerik Cfd Untuk Mengevaluasi Vortex Induced Vibration (Viv) Pada Long Flexible Cylinder Yang Dipasang Helical Rods Bergap Dengan Pitch 17.5d Dan 5d Maria Margareta Z. B., Rudi Waluyo Prastianto, dan Handayanu
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

Vortex-induced Vibration (VIV) of a long flexible riser with and without a smaller helical-shaped cylinder control is investigated numerically by computational fluid Dynamic (CFD) coupling model with computational fluid-structure interaction (FSI) method. In this study, a numerical study of three dimensional (3D) turbulent flow around long flexible cylinder in pairs of suppresion devices in the form of helical rods, with direct current used variations Reynold Number (Re) 2400, 3900, 5500, 6200, 6900 dan 7600. Helical Rods installed 60% of the length of the cylinder, with a 6 mm gap thus providing a comparison between the diameter of the cylinder (D) and the gap (?), ? / D = 0.375. Installation of helical rods with pitch 17.5D and 5D on cylinders with gap ratio ? / D = 0.375, very effective to reduce drag and lift force
Analisa Pengaruh Heat Input Pada Hasil Pengelasan Pipa Stainless Steel Terhadap Deformasi Dengan Proses Pengelasan Gtaw Menggunakan Ansys Muhammad Musta’in, Usman Dinata, Andri Mariyanto Wardani
Techno Bahari Vol 4 No 1 (2017)
Publisher : Politeknik Negeri Madura

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Abstract

Pengelasan merupakan hal umum yang banyak digunakan pada dunia industri maritim yakni dalam bidang perkapalan. Salah satu proses pengelasan yang dipakai dalam bidang perkapalan adalah pengelasan antar pipa pada outfitting kapal. Penyambungan pipa hampir semua menggunakan proses pengelasan, maka dari itu salah satu masalah yang sangat penting adalah adanya deformasi yang terjadi selama proses pengelasan maupun setelah material menggalami proses pendinginan.   Dalam penelitian ini dilakukan simulasi pengelasan sambungan pipa stainless steel A304 dengan variable masukan panas yaitu thermal condition dengan tipe sambungan I join dan menggunakan proses pengelasan GTAW.   Dari variasi paratmeter yang dilakukan diperoleh pengelasan terbaik yang menghasilkan deformasi terkecil yaitu pengelasan dengan menggunakan arus sebesar 100 A dengan besar deformasi sebesar 0,1mm sedangkan deformasi terbesar didapat pada arus 60 A dengan deformasi sebesar 1mm.

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