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PENGARUH KECEPATAN POTONG TERHADAP TEMPERATUR PEMOTONGAN PADA PROSES PEMBUBUTAN
Get PDFABSTRACT This research was to find the cutting speed differences which significantly affect the temperature of turning. A testing by turning the lathe by using different rotation, depth of cut and feeding movement were executed. The results of this research shows that by increasing the cutting speed of the turning then the cutting speed temperature will increase. While with a 95% confidence level, it was found that the cutting speed does not affect the temperature of the tools chips and workpiece. Thus the 4461 J/minutes heat generated does not lead to a wear of tools and life time still high. Keyword: Cutting Speed, Turning, Cutting Temperatur
APLIKASI PERANGKAT LUNAK UNTUK PERENCANAAN PENGELASAN PADA MATERIAL BAJA
Get PDFThe development of software in Welding Strength Design have fulfill the demand of quick account and efficiency that could manage and maximize resources. This research aim to get welding strength from several loading systems in steel material using software “Smalltalk†The result of the simulation of welding strength design for butt joint, normal tension 34,286 N/mm2 with seam welding strength Fe 390. For lap joint, normal tension 44,63 N/mm2 with seam welding strength Fe 490. At T joint for ring surface, bending strength 64,646 N/mm2 with seam welding strength Fe 590. At T joint for square surface, bending strength 79,502 N/mm2 with seam welding strength Fe 690. Keyword : Smalltalk Software, Welding Strength Design, Welding Joint
KAJIAN EFISIENSI TERMAL DARI BOILER DI PEMBANGKIT LISTRIK TENAGA UAP AMURANG UNIT 1
Get PDFABSTRACT Indonesia has a considerably high potential resources that can be harnessed to generate electricity through power plants. At Amurang Steam Power Plant (PLTU Amurang), coal is used for the fuel and boiler is the equipment to burn the coal producing heat. Boiler is one of the equipments in the thermodynamics cycle which aims to turn the water into steam. This study was conducted to determine the thermal efficiency of the boiler in PLTU Amurang Unit 1 based on operational data. The data collected from the PLTU Amurang . The data is then used to calculate the thermal efficiency of the boiler. Calculations using the direct method and the indirect method. The calculations shows boiler thermal efficiency is 91.73% and 92.33% respectively. When compared with the thermal efficiency of the boiler according to specifications then the difference is 0,41% and 0,19%. Â Key Word: Boiler and Thermal Efficienc
SIMULASI NUMERIK ALIRAN FLUIDA DALAM PENSTOCK DENGAN MENGGUNAKAN COMPUTATIONAL FLUID DYNAMICS (CFD)
Get PDFIndonesia has a potential water power resources that can be generated into electricity through hydro power plant (PLTA) and micro hydro power plant (PLTM). The water from the reservoir flow down to the turbine in a penstock, therefore the analysis of the characteristics of the fluid flow in penstock is interesting. This research worked out with a simulation to find the characteristics of fluid flow in the penstock using Computational Fluid Dynamics (CFD) by applying software GAMBIT 2.3.16 and Fluent 6.3.26. Penstock dimension was using the data available and was simulating to find out the characteristics of the flow. The dominant fluid flow characteristics are static pressure, dynamic pressure, total pressure, fluid velocity and shear stress. Result show that for static pressure in inlet 305.769,9 Pa, default-interior 305.769,9 Pa, wall 305,769,9 Pa and outlet 300.009,8 Pa. The dynamic pressure in inlet 3.595,365 Pa, default-interior 4.253,647 Pa, wall 3.602,503 Pa and outlet 4.229,900 Pa. The total pressure in inlet 309.365,3 Pa, default-interior 309.365,3 Pa, wall 309.365,3 Pa and outlet 304.235,4 Pa. The velocity of fluid in inlet 2,681554 m/second, default-interior 2,916727 m/second, wall 2,684047 m/second and outlet 2,908574 m/second. The shear stress in inlet 5,175604 Pa, default-interior 9,589236 Pa, wall 9,589236 Pa and outlet 9,518271 Pa. Keywords: Penstock, Computational Fluid Dynamics (CFD), Fluid Flow Characteristic
OPTIMASI DIAMETER POROS TERHADAP VARIASI DIAMETER SPROKET PADA RODA BELAKANG SEPEDA MOTOR
Get PDFThe rear wheel shaft of a motorcycle is classified as an axle which is supporting the bearing so that the rear tire rotated well. This study is aimed to get the optimum diameter of shaft which is capable of withstanding the load in accordance with the existing load conditions, and analyzing the torque ratio between the front and rear sprocket which have varied diameter. Optimization modeling program is using Matlab 2010. Optimization is done by using objective variable function accompanied with constraints in terms of stress and deflection on the rear axle while supporting the loads. The results of Optimization are Do 14 mm and Di 12,0889 mm, 12,0817 mm, 12,0627 mm, 12,0597mm with factory standard power of motorcycle (8426,41 Nm/s) which is complying to optimization rules. The optimization result shows the decreasing of inner diameter of the shaft along with increasing the sprocket’s diameter. Key word : Shaft, optimization, outer diameter (Do), inner diameter (Di)
EFEKTIVITAS PENUKAR KALOR TIPE PLATE P41 73TK Di PLTP LAHENDONG UNIT 2
Get PDFOne way to keep a plant operate optimally is keeping the effectiveness of the components properly. One of the components used in the production process is heat exchanger. In PLTP Lahendong unit 2 is used as a the cooler lubricant system of generator and turbine is using type of plate P41 73TK heat exchanger.This research objective is to determine the effectiveness of the heat exchanger plate type PLTP Lahendong P41 73TK. Calculation are using formulas that correspond to the type of heat exchanger plate and plate heat exchanger assuming that analyzed as a tube.Results of the calculations shows that the effectiveness of plate heat exchanger on the methods of LMTD is 83,3%, obtained by the thermal heat exchanger effectiveness of 55.6% and effectiveness based on method of NTU is 30.3%.Keywords : Effectiveness, type heat exchanger plate, LMTD method, method of NT
PENERAPAN METODE ANALYTICAL HIERARCHY PROCESS (AHP) UNTUK IDENTIFIKASI PREFERENSI KONSUMEN PADA PEMILIHAN MINYAK PELUMAS SEPEDA MOTOR TIPE 4-TAK
Get PDFLubricating oil available in a wide range which is offered consumers through the promotion in order to convince consumers that the product is the best. This study aims to determine preferences of consumers in the selection of motorcycle 4-stroke type lubricating oils using Analytical Hierarchy Process (AHP) method. From the analysis using the AHP based on criteria, it shows that durability is ranks the first with a weight value of 0.5034, following with stock availability (0.5019), price (0.4248), and recommendations of manufactorer coming last (0.3840). As for the preference of alternative lubricating oil, analysis base on brand of motorcycle it shows that Yamaha with Yamalube 7.5% all criteria, Honda with Yamalube of respective value 4.77% and 4.37% on criteria recomendation of manufactorer and price, Enduro 3.16% the stock availability, and federal 3.08% for durability. Suzuki of Yamalube which is value of 3.43% and 3.05% on criteria recommendation of manufactorer and price, Enduro ​​respectively 3.56% and 3.43% to criteria stock availability and durability. Kawasaki on Enduro with 43.76% and 26.85% to the price and stock availability, Top-1 27.17% and 31.28% to recommendations of manufactorer and durability. Keywords : Preferences, Oil Lubricants, AHP, Criteri
PEMANFAATAN AIR PANAS BUMI UNTUK ALAT PENGERING GABAH DI BUKIT KASIH KANONANG
Get PDFTraditionaly heat from the sun is employ in drying. The weakness is drying time relatively too long and weather can not be controlled. The utilization of spring water in Bukit Kasih Kanonang for drying of grain is an alternative that does not depend on weather conditions. The spring water heats the plate, then hot of plate directly in contact with the grain. It is causes the grain receiving heat and evaporate the water in the grain, them the grain dried well. From this research, it can be concluded that the drying time effect on grain’s moisture content linearly. The longer the drying time, the lower the moisture content of grain. In this research, the process of drying grain with water temperature 60 0C is enough dry the grain as 2, 104 kg during 5.13 hours. Keywords : Grain, Spring Water, Bukit Kasih Kanonan
INTEGRASI FMEA DAN ANALISIS SWOT UNTUK PEMILIHAN TINDAKAN KOREKSI PROSES DISTRIBUSI GAS ( STUDI KASUS DI PT. ANEKA GAS INDUSTRI BITUNG )
Get PDFIn gas industry , gas is distributed to customer in the form of gas tube. Empty gas tube from customer will be refilled in filling plant. In its operation, gas distribution is consisting of two activities,  namely, delivering gas and picking up empty tube. Based on its historical data, PT. Aneka Gas Industri once in a while facing an  operational failures. One of the solution proposed is applying FMEA (Failure Mode and Effect Analisys)  method. From its application it is observable some critical and some potential corrective measures. In order to consider  internal and external aspects of company operation, SWOT Analisys is integrated into the FMEA method. Results of integrating SWOT Analisys into FMEA Method used to determine Correctional measures taken. Key word : Gas Distribution, FMEA method, SWOT Analisys, correctional measure Â
UNJUK KERJA POMPA AIR SHIMIZU TYPE PS-128 BIT YANG DIFUNGSIKAN SEBAGAI TURBIN AIR
Get PDFABSTRACTUtilization of water pump Shimizu Type PS-128 Bit which functioned as a water turbine for Micro Hydro Power Plant (MHPP) is an effort in the search for alternative energy in a simple and easy in term of manufacturing and assembling. Principally, the water pump is used to suck the water from a lower surface and raise it to a certain height. The basic of working of a pump is the opposite of a water turbine, and therefore can function as reaction water turbine, in which water from a certain height rotate the pump impeller.Testing the water pump Shimizu Type PS-128 Bit as a water turbine is carried out in the Laboratory of Mechanical Engineering University of Sam Ratulangi. The “reaction turbine†is driven by four water pumps which connected in series and parallel. It aims to get different heights (head) and flow rate (Q).Flow rate and the load on the dynamometer (W1) has been determined, as the lowest round “reaction turbine†that is charged with the force (N) certain turbine cannot rotate. So that initial water discharge is determined by Q = 31 liters/minute. Based on the research that has been done that the power generated depends on the rotation, H and Q. The maximum power generated Pm = 12 watt is at Q = 37 liters/minute, H = 18 m, and n = 1080 rpm.Keywords: Pump, Reaction Turbine, Head, Flow rate