R.E.M. (Rekayasa Energi Manufaktur) Jurnal
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154 research outputs found
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Pengaruh Variasi Holding Time Peleburan terhadap Karakteristik Logam Al-Si Menggunakan Cetakan Pasir: The Effect of Melting Holding Time Variations on Al-Si Metal Characteristics Using Sand Mold
No full textMolten metal is a method to form metal to be base material of making equipment and give great advantages to human life. Purpose of this research is to find out impact value, hardness, macro defect, and micro structure as the result of holding time in molten Al-Si. Impact value of Al-Si due to molten holding time by variation of 0, 10,20, and 30 minutes are respectively 0.37 joule/mm2, 0.29 joule/mm2, 0.30 joule/mm2, and 0.26 joule/mm2. Meanwhile, hardness value of 0, 10, 20, and 30 minutes holding time are respectively 65.886 kg/mm2, 81.681 kg/mm2, 88.86 kg/mm2 and 86.265 kg/mm2. Brittle fracture occurred in all specimens and granule size of micro structure is smaller with the holding time. This research confirms that impact value has inverted correlation to hardness value. The lower of impact value, the higher hardness value. Based on micro structure observation on Al-Si casting due to molten holding time in 0, 10, 20, and 30 minutes variation, it is obtained smaller granule size
Pengaruh Sudut Pengarah Aliran Pada Turbin Air Crossflow Tingkat Dua Terhadap Putaran dan Daya: The Effect of Flow Guide Angle on a Level Two Crossflow Water Turbine on Rotation and Power
No full textThe potential of hydro energy is very large both for large scale and for small scale. Until now, the need for energy continues to increase, so that energy is a very important element in the development of a country or a region. Cross-flow turbines are one type of turbine that is often used for PLTMH. In this study planning a cross-flow water turbine applied to the height and amount of water per second in the irrigation channel water flow, this water flow will rotate the turbine shaft to produce mechanical energy. With variations in the direction of the turbine flow direction, namely 30o, 35o, and 40o, and the same variation of water discharge 10,5 L / s, 21 L / s and 31,5 L / s to determine the effect on the rotation and the power produced. In this study with 12 turbine blades, 30o blade angle, 40o flow direction angle, and 31.5 L / s water discharge obtained the highest first stage turbine rotation value is 478 rpm. Whereas at the flow direction angle of 30o with the same water discharge which is 31.5 L / s so that the first stage of the turbine is obtained is 296 rpm
Pengaruh Daya Motor Bensin Terhadap Kapasitas Produksi Mesin Pemipil Jagung: The Effect of Gasoline Motor Power on Corn Sheller Machine Production Capacity
No full textThe demand for corn kernels is increasing in developing countries. This study focuses to investigated the effect of power engine on the production capacity of corn sheller machine. The power of engine has been varied i.e 4 HP, 5,5 HP and 8 HP. The methods of this research using by empirisly calculated. The results shows that the maximum production capacity obtained on power engine at 8 HP, 5,5 HP and 4 HP are 14 kg/minutes, 10 kg/min, and 7 kg/min, respectively. The conclusion of this research is the production capacity of corn sheller machine affected by power engine, shaft diameter, pegs length, bearing number and spin sheller
Analisa Hasil Uji Impak Sampah Plastik Jenis PP, PET, dan Campuran (PP + PET): Analysis of Impact Test Results for PP, PET, and Mixed Plastic Waste (PP + PET)
No full textMaterial Plastic is difficult to decompose, so it needs to be held research on utilization of plastic waste that is around us. Impact test on recycled plastic waste aims to find out the physical properties, tenacity, toughness of plastic waste re-rubbish. Specimens of impact test based on standard sample (ASTM E-23) with Charpy test rod has dimension of size is 10 x 10 x 100 mm (height x width x length). With the notch position in the center, with a V note notch, 2 mm notch depth from the surface of the specimen and 45º notch angle. The specimens were made according to the sample with the test carried out 10 times, with the result of the average value of the specimens being the polypropylene type plastic of the mean energy impact value = 1.31 joule and the mean impact strength value = 0.0161 joule / mm². Polyethylene Terephthalate plastics with mean value of impact energy = 1.15 joule and mean impact strength = 0,0138 joule / mm², plastic mixture between PP and PET value of impact energy = 1.18 joule and mean impact strength = 0.0145 joule / mm². The results of this Polypropelin plastic test have the highest impact value value for recycled plastic waste
Estimasi Posisi Magnetic Levitation Ball Menggunakan Metode Akar Kuadrat Ensemble Kalman Filter (AK-EnKF): Estimation of the Magnetic Levitation Ball Position Using the Ensemble Kalman Filter (AK-EnKF) Square Root Method
No full textThe role of Magnetic Levitation Ball in an industrial world is very important, among others, as system applied to a train moving on the rail at high speed (MAGLEV). Magnetic Levitation Ball is system consisting of a ferromagnetic solid steel ball floating over The surface of air medium when supplied with electromagnetic power which is hard to predict its position, and therefore estimations is required to estimate the position, and speed of the steel ball when the electromagnetic power is supplied to the steel ball. This paper was study on application of the modification of Ensemble Kalman Filter (EnKF) method by adding Root Square at the stage of corecction called Ensemble Kalman Filter Square Root (EnKF-SR). Implemented to the mathematical model of magnetic levitation ball and speed of ferromagentic steel ball the result of the simulation of EnKF-SR using mathematical model of magnetic levitation ball showed that the error was less than 2% by generating both 200 and 300 ensembles. The least error was observed when 200 ensemble was generated at which the position error of ball was 0.018 m, and speed of the bll was 0.016 m/s and the electric current was 0.018 A
Frais chisel Shaft Strength Calculation on the Model in the Laboratory Hydrodynamic: Perhitungan Kekuatan Poros Pahat Frais pada Model di Laboratorium Hidrodinamika
No full textA process process in the manufacture of milling machines Keyway (slot) propeller shaft models - ship propeller is routine work done in BTH-BPPT. The main work in this process requires the use of a standard cutting blade milling (Hight Speed Steel), therefore the technical study on the magnitude of cutting force is needed in predicting the service life of the milling blade. To get the service life of the chisel eye analysis in the process of cutting with a knife cut milling standard (HSS) where the variables selected in this machining processes such as engine speed is very influential parameter to change the style, torque and strain. The results showed that for the process sharpener at rpm 400 rpm and 500 rpm eyes chisel operating under normal conditions, while at rpm 785 rpm chisel eye operating at extreme conditions in which the generated strain of 39.6 Ksi and lifespan chisel 138 operational days 4,5 frais chisel or a calendar month
Studi Kasus Analisis Kegagalan Material Piston Sepeda Motor: Case Study of Motorcycle Piston Material Failure Analysis
No full textThis paper presents the failure anaylisis on the motorcycle’s piston.The analysis procedure consists of physical observation (metallography), mechanical testing (hardness testing, and chemical composition testing (spectrometry). Result physcal observation shows there are scratches and changes in color on the surface of the piston wall. Based on spectrometer test, piston is made from Al-Si-Cu-Mg alloy with AA336.0 series. Hardness vickers testing showed the distribution ofHVN on the walls and heads of pistonare not decrease significantly. Hardness on the head of piston is 136.06 HVN, while on the wall of piston is 134.3 HVN. Based on the analysis, the failure is caused by lubrication failure that causes piston over heat and burning
Kajian Numerik Pengembangan Symmetrical Blade Propeller Untuk Kapal Patroli 60m dengan Menggunakan Teori Lifting Line: Numerical Study of Symmetrical Blade Propeller Development for Patrol Boats 60m Using Lifting Line Theory
No full textThe development of technology science in the field of maritime is one aspect that needs to be considered. One of them is the development of a propulsion system that is able to work efficiently (Aspects of hydrodynamics) On patrol boats of Indonesian waters guard. Because during this design and manufacture of propellers in need on fast boats is highly dependent on foreign parties. Therefore, the purpose of this study was to produce a propulsion system design suitable with a 60m patrol boat. So that it can be standardized the main size of the boat with its propulsion system. This research is conducted through several stages, where we design the propulsion system and calculated numerically computation (Matlab) Which will be used as a performance analysis of the design that has been determined. So from the results it is known, that the type of propeller boat type 60m patrol match with the engine of the ship that has been set
Analisa Pengaruh Variasi Diameter Pipa Tekan PVC Pada Pompa Rotari Untuk Kecepatan Gaya Dorong Air: Analysis of the Effect of Variation in Diameter of PVC Pressure Pipe on Rotary Pumps for Water Thrust Velocity
No full textThis research is aimed to analyze the effects of the PVC rotary pipe’s diameter to the velocity of the viscous forces. The diameter of the PVC rotary pipe used in this research are (1 ½”, 1”, ¾”, ½” inch). The procedure of this reasearch is begin with designing the pipe’s installation, then continued with the pipe installation, then continued with data recording. After the data is collected from the experiment, analyzing the data is needed. Also, calculate if there’s any effects of the velocity of the viscous forces due to the changing of the dependent variables (which is the diameter of the PVC rotary pipe). In the process of the fluid conduction inside the pipe, head losses are usually happened. The manual calculation needed to complete the research are, surface area calculation, fluid velocity calculation, reynold number calculation and coeff. Losses calculation. After all of the calculation are collected, the result of the research will be obtained. After that, discussion and conclusion can be produced
Analisis Drag dan Lift pada Variasi Bentuk After Body Kapal Selam Mini dengan Metode Computational Fluid Dynamics: Analysis of Drag and Lift on Variations in the After Body Shape of a Mini Submarine with Computational Fluid Dynamics . Method
No full textOne aspect that needs to be studied in submarine design is the hydrodynamic aspect relating to submarine maneuverability. This research begins by calculating the value of drag and lift on the three variations of the after body’s mini submarine. The first variation as the initial design is rudder and stern plane arranged perpendicularly or named the+ Stern. Then for the second variation made changes to the arrangement of rudder and stern plane in the after body of the mini submarine with + Stern arrangement, the rudder arranged each other crossed so that it resembles the letter X and called the X-Stern arrangement. Further, for the third variation, the upper rudder of the X-Stern arrangement is replaced by the upper rudder of the + Sternarrangement so that it resembles the inverted Y letter and is called the Y-Stern arrangement. Drag and lift are calculated numerically by using ANSYS-CFX software. From the calculation of CFD found that the submarine with after-body Y-Stern arrangement has the smallest drag and lift value