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Nurir Rohmah
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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 127 Documents
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Penggunaan Filter Pasif Dan Thyristor Controlled Reactor (Tcr) Sebagai Kompensasi Daya Reaktif Berbasis Fuzzylogic Controller Kukuh Widarsono
Techno Bahari Vol 3 No 2 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Saat ini banyak industri-industri baik manufacturing maupun pertambangan yang sistem operasinya menggunakan motor. Motor-motor tersebut banyak yang dilengkapi degan Variable Speed Drive (VSD) dalam pengoperasiaannya, hal ini dilakuakan dengan tujuan penghematan penggunaan energi listrik. Akan tetapi penggunaan VSD dapat menimbulkan masalah baru, yaitu dapat menurunkan kualitas daya pada sistem kelistrikan. Menurunnya kualitas daya ini karena sistem VSD memunculkanharmonisa pada sistem. Solusi saat ini yang banyak digunakan untuk mengatasi masalah tersebut adalah filter pasif yang di kombinasikan dengan Thyristor Controlled Reactor (TCR). Penelitian ini membahas desain filter pasif dan TCR berbasis FuzzyLogicController (FLC). Filter pasif merupakan filter yang digunakan untuk menyerap harmonisa yang terjadi pada sistem dan juga sebagai kompensasi daya reaktif. Filter pasif yang digunakan disini adalah jenis filter single tuned. Sedangkan TCR (berbasis FLC) merupakan rangkaian induktor dan thyristor yang dikontrol menggunakan FuzzyLogic dengan tujuan menjaga kestabilan power factor sistem. Rangkaian filter pasif dan TCR ini dipasang pada belitan tersier dari trafo 3 belitan. Dalam simulasi ini plant yang digunakan adalah Tabang Coal upgrading Plant (TCUP). TCUP adalah perusahaan tambang batu bara yang ada di Kalimantan timur.Setelah disimulasikan didapatkan bahwa pemasangan filter pasif dan TCR dapat meningkatkan power factor dari 89% menjadi 95% sekaligus menjaga kestabilan power factor pada point 95%. Selain itu, pemasangan filter pasif juga menurunkan THD arus dari 17% menjadi 1.44%.
Penerapan Metode Layer Of Protection Analysis (Lopa) Pada Hydrogen Plant I Made Aditya Dharma Putra, Binti Mualifatul R, S.Si, M.Si, Rona Riantini, S.T, M.Sc
Techno Bahari Vol 3 No 2 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Hydrogen plant (H2) merupakan tempat produksi gas hidrogen. Gas hidrogen bersifat highly flammable pada konsentrasi 4-75% di udara dan menjadi explosive pada konsentrasi 18,3-59% di udara. H2 plant memiliki safeguard untuk mencegah terjadinya risiko bahaya. Jika terjadi kegagalan pada safeguard dalam menghadapi risiko bahaya maka menimbulkan kerugian. Kajian diperlukan untuk mengidentifikasi potensi bahaya dan menganalisa risiko, dengan tujuan untuk mengetahui kecukupan safeguard. Metode Major Hazards Analysis (MHA) digunakan untuk mengidentifikasi seluruh potensi bahaya beserta nilai risikonya, sedangkan metode Layer of Protection Analysis (LOPA) digunakan untuk menganalisa dan mengevaluasi kecukupan perlindungan yang sudah ada dalam menghadapi risiko bahaya. Analisa LOPA digunakan bedasarkan risiko bahaya yang memiliki kategori risiko terburuk (ekstrem). H2 plant yang terbagi dalam 9 node teridentifikasi 71 risiko bahaya dengan 11 risiko bahaya kategori rendah, 13 risiko bahaya kategori moderat, 35 risiko bahaya kategori tinggi dan 12 risiko bahaya kategori ekstrem. Berdasarkan analisa LOPA diperoleh 2 risiko termasuk dalam level very high zone, 7 risiko termasuk dalam level high zone, dan 3 termasuk dalam level moderate zone atau dapat ditolerir. Penambahan IPL dilakukan dengan tujuan mengurangi frekuensi skenario pada risiko dengan level very high zone dan level high zone. Penambahan berupa, SIS loop atau safety interlock.
Perancangan Sistem Kontrol Kestabilan Kapal Korvet Sigma Hassanudin-366 Menggunakan Pendekatan Linier Dan Nonlinier Dengan Gangguan Gelombang Air Laut Sea State 6 Devina Puspita Sari
Techno Bahari Vol 3 No 2 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Many disaster due to the magnitude of disturbance sea waves behind a study on the stability control system rolling corvette warship KRI Hassanudin SIGMA-366. In this study a comparison between dynamics modeling warship approach Nomoto linear and nonlinear Hamamoto. Fuzzy logic control is used Takagi Sugeno. KLF have two inputs, error heading and yaw rate. External disturbances such as waves disturbances sea state six. With the wave disturbances, responce control rolling stability to longer than no disturbances . Response actual stabilization test and simulation rolingl with input heading 200 and 300 in according to the standards of IMO (International Maritime Organization). The results of the modeling system performance stability control ship when the sea state is given disturbance wave six conducted by Nomoto linear method is better than the nonlinear state space Hamamoto method. Maximum overshoot generated by a closed loop system with linear and nonlinear wave disturbances have met the criteria with a maximum system stability overshoot twice before returning to a steady state with a maximum of time 18 seconds.
Aplikasi Sistem Peringatan Dini Pada Kapal Berbasis DataGps (Global Positioning System) Menggunakan Logika Sryang T. Sarena, Ryan Y. Adhitya, Catur R. Handoko, Noorman Rinanto, Kukuh Widarsono
Techno Bahari Vol 3 No 2 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Automatic Identification System (AIS) is an important equipment in ship for giving ship’s information to other ships or harbour. Unfortunately, there is still no ship collision warning system included in AIS. Hence, an application of ship collision early warning system based on Global Positioning System (GPS) data is proposed in this paper. Here, the zero-order sugeno fuzzy logic is used to process the ships speed and position data. The output of this warning system are recommended ships speed and heading direction to prevent the ship collision based on IMO (International Maritime Organization) regulation. The object used is a ship prototype equiped with GPS. The testing is held in four position of the ship prototype againts static object. The positions are -45o, -25o, 25o dan 45o. The testing results yield 100% accuracy to the IMO regulation of the head on situations case.
Analisis Resiko Berdasarkan Metode Risk Based Inspection (Rbi) Pada Scrubber Vessel Dika Rahayu Widiana, Teguh Wahyudi
Techno Bahari Vol 3 No 2 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Chemical industrial activities in PT. X involves scrubber vessel to treat dust from the dryer and granulator so that air is disposed comply the threshold value. Therefore scrubber vessel's reliability is important in air pollution prevention activities in this industry. Implementation of inspection program is one of the key to maintain the system reliability. Implementation of inspection program to maintain the system reliabilty has evolved by the time. Traditional inspection program only based on perspective of industrial practices and not based on the actual condition of component in conducting inspections. Risk Based Inspections (RBI) involves the planning of an inspection on the basis of the information obtained from a risk analysis of the equipment. The purpose of the risk analysis is to identify the potential degradation mechanisms and threats to the integrity of the equipment. Risk analysis also has purpose to assess the consequences and risks of failure. This final project will analyze the risk of scrubber vessel failure based on RBI 581. Based on the analysis, the third scrubber vessel has probability with value 0,00009 failure/year and be categorized 2. Consequences of toxic area is 82483.78 ft2 and be categorized E so the risks are classified as medium-high 2E.
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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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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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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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.

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