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Optimasi Parameter Pemotongan Mesin Bubut CNC Terhadap Kekasaran Permukaan dengan Geometri Pahat yang Dilengkapi Chip Breaker Wibolo, Achmad; Wahyudi, Slamet; Sugiarto, Sugiarto
Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In machining operation, the quality of surface finish is an important requirement for many turned workpieces. Thus, the choice of optimized cutting parameters is very important for controlling the requied surface quality The focus of present experimental study is to optimize for cutting speed, feed rate, and radius chip breaker using two performance measures, metal removal rate and surface roughness. Response Surface Methodology (RSM). has been applied for developing models in the form of multiple regression equations correlating dependent parameters with cutting parameters and radius chip breaker, in a turning process. The central composite rotatable design was used to plan the experiment, and analysis of variance were employed to study the performance characteristics for three variable independent in turning operation. A second-order model which can describe the relation then to find combination between cutting parameters and radius chip breaker which resulting the maximum metal removal rate and minimum surface roughness. The experimental results reveal that the most significant cutting parameters for surface roughness is cutting speed, followed by feed rate and radius chip breaker. Based on the optimization results, recommended cutting speed, feed rate, and radius chip breaker is 35 m/mt, 0,2819 mm/rev, and 0,85 mm. By implementing this parameters, the surface roughness and metal removal rate is 2,18 μm and 6230,80 mm3/mt.Keywords : Surface Roughness, Metal removal rate, response surface methodology, turning
Analisis Perpindahan Panas pada Saluran Berliku Berpenampang Segi Empat dengan Variasi Clearance Belokan Wahyudi, Slamet; Kurniawan, Aris; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Heat transfer characteristics in rectangular with a sharp 180o turn have been examined experimentally using the naphthalene sublimation method. The sharp 180° turn was obtained by dividing a rectangular passage into two channels using a divider wall with a rounded tip at the location where the flow negotiates the turn. The channel cross-section (WxH) is 50×25 m, and three turn clearances of 30, 50, and 70 mm have been tested in this study. Local mass transferrates on all walls of the channel have been measured to clarify the heat transfer characteristics in the channel. The result indicated that the highest coefficient of heat transfer was achieved in the channel with turn clearances of 30 mm.Keywords: Heat Transfer Characteristics in Rectangular,Turn Clearances, Mass Transfers
Pra Studi Kelayakan Potensi PLTM/PLTA Di Area PT. PJB Unit Pembangkit Brantas Budiono, Budiono; Wahyudi, Slamet; Sutikno, Djoko
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In accordance with government policy to further optimize the utilization of renewable energy sources, and the policy of PT. PLN (Persero) to reduce the consumption of primary energy derived from fuel, then the PT Pembangkit Jawa-Bali (PT. PJB) plans to optimize the utilization of water resources in the Area PT. PJB Unit Pembangkitan Brantas that have the potential to be developed into minihyro power plants / hydro power plant with a capacity of under 10.0 MW. One purpose of this study is to anticipate the demand for electricity is increasing every year as well as to reduce dependence on primary energy derived from fossil tend thinning, as well as the concern of PT. PJB to environmental sustainability and clean development.Keywords : Pre-Feasibility Study, Potential of Minihydro Power Plants / Hydro Power Pant.
Pengaruh Alkalisasi Komposit Serat Kelapa-Poliester Terhadap Kekuatan Tarik Maryanti, Budha; Sonief, Ahmad As'ad; Wahyudi, Slamet
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The purpose of this research is to analyze the effect of alkalization on the tensile strength and strain of coconut fiber composites with polyester matrix by varying the concentration of NaOH as follow 0%, 2%, 5% and 8%. Alkalization is one of modifications natural fibers to improve fiber-matrix compatibility.The method of this research used a hands lay-up method. As follow the 1st coconut fiber treated without alkalization or 0% alkalization and the 2nd coconut fiber immersed in alkaline solution (2%, 5% and 8% NaOH) for 1 hour. Then, each treatment specimen molded to composite according to standard tensile test ASTM D638 –I. Coconut fiber volume fraction 30% and 70% polyester, and arranged coconut fiber straightly. And used the matrix polyester resin type 157 BTQN with hardener MEKPO 1%.The results of this research showed that coconut fiber reinforced composites with NaOH concentrations of 0%, 2%, 5% and 8% respectively has a tensile strength that is 90,144 MPa, 93.75 MPa, 97,356 MPa and 94,151 MPa. The optimum concentration limit of 5% NaOH produced the highest tensile strength 97,356 MPa, while the composite of coconut fiber without alkalization has the lowest tensile strength 90,144 MPa. Keywords: coconut fiber-polyester composites, alkalization, tensile strength
Komposit Hibrid Polyester Berpenguat Serbuk Batang dan Serat Sabut Kelapa Lumintang, Romels C. A.; Soenoko, Rudy; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sawdust coconut trunks of palm trees and fiber coconut coir are two waste materials from the processing of coconuts and coconut tree trunks sawmill waste are plentiful materials can be utilized for producing composites using polyester resins. Both each properties materials as follow polyester resin: liquid in the open air conditions, sawdust coconut and coconut coir fiber properties is lightweight and fragile nature of the polyester adhesive used as a binder (binder) between fiber coconut coir and sawdust coconut palm tree trunks as a filler. The variation volume fraction between the sawdust and coconut trunks of fiber coconut coir in polyester resin influence mechanical properties for each composition of this composite. By comparizing the volume fraction of either polyester, sawdust coconut palm tree trunks and fiber coconut coir (Coir coconut) using tensile test standard ASTM D638-I, and the ASTM D6110 for impact testing. The result of tensile and impact test, obtained that the optimum percentage 30:10 per cent, mean tensile strength on 95.953 N/mm2 , mean elasticity 0,125 % , mean elasticity modulus 768.702 N/mm2, mean absorbed energy 2,679 J and mean impact value 0,068 J/mm2. Keywords: Polyester, Sawdust coconut, coconut coir fiber, mechanical properties
Pengaruh Variasi Tebal Sudu Terhadap Kinerja Kincir Air Tipe Sudu Datar Wahyudi, Slamet; Cahyadi, Dhimas Nur; Purnami, Purnami
Jurnal Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Waterwheel is a means to change the water energy into mechanical energy in the form of torque on the wheel shaft. Working waterwheel by the large flow and high utilization of water falls. Today the water wheel still has a small efficiency when compared to water turbines that exist at the moment. Therefore, it still needs further research to improve the efficiency of the water wheel. The purpose of the study is to determine the performance of the blade thickness variation waterwheel flat blade type. In this study, using a kind of overshot waterwheel with a thickness variation of different blades of 0.3; 0.6; 0.9; and 1.2 cm and a water capacity of 10-20 m3/hr. Furthermore be obtained shaft power and efficiency of the water wheel. By using statistical analysis showed that the shaft power and efficiency is influenced by variations in thick blade. In this test shaft power and highest efficiency artifacts on blade 0.3 cm thick.Keywords: windmill water, the thickness of the blade, the performance
ProduksiI Brown’s Gas Hasil Elektrolisis H2O Dengan Katalis NaHCO3 Marlina, Ena; Wahyudi, Slamet; Yuliati, Lilis
Jurnal Rekayasa Mesin Vol 4, No 1 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research is intended to investigate the effect of NaHCO3 (Natrium Bicarbonate) percentage on the performance of HHO (Brown’s Gas) production using electrolysis method. Performance of HHO production that was observed in this research were electric power that used for HHO production as well as rate and efficiency of HHO production. Electrolysis is decomposition of water molecules (H2O) into hydrogen and oxigen molecules (HHO) using electricity in an electrolite solution. This process takes place when two electrodes (anode and cathode) placed in the water and direct electric current flowed through the system. In this research Natrium Bicarbonate was dissolved in the water to increase the rate of electrolysis process. Percentage of Natrium Bicarbonate was varied from 2,5% – 15%. The results show that electric power that used for HHO production and rate of HHO production were increased with the increasing of Natrium Bicarbonate percentage and reach their maximum value at 12,5% Natrium Bicarbonat. However maximum value for electrolysis efficiency was occurred for Natrium Bicarbonate percentage of 10%.Keywords: Brown’s Gas, Electrolysis, NaHCO3 (Natrium Bikarbonate), Performance of electrolysis process
Pengaruh Diameter Inner-Helical Fin Terhadap Characteristic of Performance Counter Flow Heat Exchanger Bula, Muhamad; Wahyudi, Slamet; Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The study of energy conservation using the head exchanger with different fin shapes havebeen carried out, including research on the counter flow heat exchanger using a helical spiral shaped fin is placed on the inner pipe. The problem lies in the acquisition of the influence of the diameter of the helical fin to the characteristic of performance counter flow heat exchanger. The diameter of the helical fin which the test is 8 mm, 12 mm and 16 mm. The objective is achieved, the effect of the diameter of the helical fin characteristic of performance counter flow heat exchanger in the increase of hot water discharge 400 liters / hour, 500 liters / hour, 600 liters /hour, 700 liters / hour, 800 liters / hr and 900 liters / hour. Method of design of experiments with laboratory-scale experiments using a set-up equipment double tube heat exchanger is the method used. The results obtained, the highest effectiveness for all types of helical fins foundon discharge 400 liters / h with the order from highest to lower the effectiveness of internal diameter of 12 mm reached 17.66%, diameter of 8 mm effectiveness reaches 15:56% and the internal diameter of 16 mm effectiveness of achieving 14.29%. For the plain tube efektiftasobtained 11:48%.Keywords : heat exchanger, the diameter of the helical fin, hot water discharge, effectiveness
Pengaruh Jumlah Sudu Terhadap Optimalisasi Kinerja Turbin Kinetik Roda Tunggal Pietersz, Richard; Soenoko, Rudy; Wahyudi, Slamet
Rekayasa Mesin Vol 4, No 2 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Indonesia has a great potential to develop hydropower, because Indonesias mountainous topography and hilly and is drained by numerous rivers (large and small), and in certain areas there are lakes or reservoirs and the potential of water as an energy source. Hydroelectric Power Plant (PLTA) is a technology that has been proven to not harm the environment, support the diversification of energy as renewable energy, support the use of fuel reduction program, and most of the construction using local materials. Kinetic Turbine is one of the options in utilizing the potential of the kinetic energy in the form of velocity, kinetic studies using vertical shaft turbine, blade-shaped bowl that can withstand the flow in order to increase the tangential force generated.Amount ofkineticturbine bladesis one ofthe variablesthat affect therotationandtangentialstyle ofaturbine, so the effecton the value ofthe powerand efficiencyofakineticturbine. The results showedthe influence ofthe number ofbladesonthepowerand efficiency ofbladenumber5,7,9and11,where the number ofblades11have a greater influencethan thenumber ofblade5,7, and9.Keywords: waterturbine, number ofblades, Performance
Simulasi Pengendalian Kualitas Pengaruh Deformasi Material Condenser Tube terhadap Proses Tube Expanding Waterbox Condenser (Studi Kasus di PT. BBI Pasuruan) Pratama, Aditya Wahyu; Wahyudi, Slamet; Santoso, Purnomo Budi
Rekayasa Mesin Vol 5, No 1 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Leakage tube after tube expanding process is still occurred in PT. BBI Pasuruan due to imperfect material deformation. Material deformation cause by a change in material form due to external forces such as temperature, friction force, compressive force, and the torque style. Deform 3D was used in this investigation to determine the material deformation processes. Taguchi method design of experiment was also used to minimize the bad cause of the poor performance is also influenced by several variables or factors on the characteristics of the desired quality. The results shows that the combination to prevent deformation of the material in the condenser tube are the friction between the tool and the tube expander of 0.787 inch, the material used is stainless steel ASTM A 249 grade 2, tube expanding process temperature optimum of 89.6 F, and expander velocity of 0.708 inches per second.Keywords: Taguchi method, design of experiment, tube expanding, material deformation