Jurnal Energi dan Teknologi Manufaktur (JETM)
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Pengaruh Konfigurasi Sudut Chamfer Male-Female dan Lama Gesek Terhadap Karakteristik Hasil Pengelasan dan Kekuatan Tarik Paduan Alumunium 6061
Full text linkThis study aims to analyzed the effect of male-female chamfer configuration in a rotary friction welding of alumunium 6061. The male-female chamfer configuration tend to make an inner chamfer and outer chamfer shape between two connected materials. The chamfer angle analyzed varies in 300, 450, and 600 where the friction time also varies in 1 and 2 minute. The results shows that the tensile strength increased along with smaller chamfer angle and longer friction time. The largest tensile strength of 33.92 kgf / mm2 was obtained in the variation B30. The smallest tensile strength of 12.20 kgf/mm2 gained in specimen A60. Smaller chamfer angle leads to a larger friction areas which caused the welding contact areas also wider. The male-female chamfer method slopely increase the contact area by 78%, 33% and 12% than normal circle profile
Perencanaan Perawatan Mesin Pump 107 Dengan Metode Reability Centered Maintenance (RCM) di PT. Petrokimia Gresik
Full text linkPT. Petrokimia Gresik is one of the largest fertilizer companies in Indonesia, locatedin Gresik, East Java. The pump 107 engine on the Ammonia unit is often damaged due to itslargest size compared to other types of pumps, as well as the result of carrying thick orconcentrated fluid (bluish black) so that it is heavy for the drainage process. The purpose ofthis study is to plan and recommend the proposed treatment method on the pump enginebased on the method used to improve the working efficiency of the pumping machine 107and determine the failure mode and diagnosis of the effects of failure modes that occur in thecomponent. The method used is the Reability Centered Maintenance (RCM) method whichis expected to be able to produce maintenance or maintenance scheduling that is increasinglydirected so that it can improve the performance and efficiency of the engine, reduce repaircosts, and extend the service life of the machine itself. From this study, the results are in theform of Faliure Model And Effect Analysis (FMEA), FMEA table preparation is carried outbased on component function data and maintenance reports which can then be determined byvarious failures resulting in malfunction. From the compilation of FMEA, it can be seenwhat the causes of failure are and what impacts they have caused. Next, the value of MeanTime Between Failure (MTBF) pump 107-JA is 15,829 hours, pump 107-JB is 43,764 hoursand pump 107-JCM is 19,578 hours. Maintainability M (t) or Mean Time to Repair (MTTR)value on pump 107-JA is 2,914 hours, pump 107-JB is 3,411 hours, and pump 107-JCM is3,1 hours, Availability A (t) value is pump 107-JA at 84.44%, pump 107-JB at 92.76% andpump 107-JCM at 86.31%. The last one is found that the failure rate of pump 107-JA is0.063172, pump 107-JB is 0.02284 and pump 107-JCM is 0.051
Pengaruh Campuran Bioetanol – Pertamax 92 Terhadap Kinerja Motor Otto
Full text linkProblems in the process of burning fossil fuels still produce power and torque of the engine with large fuel oil needs. Various ways can be done to improve engine performance by using bioethanol as a mixture of pertamax without reducing engine power and torque, the use of fuel pertamax may reduce. The purpose of the study to determine effect of the use of bioethanol mixture with pertamax fuel to power and torque of gasoline engine, in addition to know the working temperature of radiator water and exhaust gas especially the injection system capacity of 150 cc. The study process uses experimental method which is devided into several steps: mixture bioetanol and pertamax 92 with volume comparison, vehicle power and torque test use chasis dynamometer, working temperatur of radiator water and exhaust gas test use sensor thermocouple K type. The results of the study indicate that in the Bp 30% mixture on 8000 rpm, the power is increased by 12.92 Hp with radiator water temperature of 52.96 °C at the exhaust gas of 126.85 °C. While the torque is increased by 13.47 Nm blend of Bp 30% at 6000 rpm with radiator water temperature of 52.51 °C at the exhaust gas of 136.15 °C. Based on the result mixture bioetanol and pertamax 92 with precentages 30% increased vehicle power and torque
Perencanaan Turbin Air Kapasitas 2 x 1 MW di PLTM Cianten 1 Kabupaten Bogor
Full text linkMinihidro Cianten 1 Power Plant (PLTM C-1) capacity 2 x 1 MW, located in Cianten river, Cibunian village, Pamijahan district, Bogor district. Preliminary planning data is with design head (Hd) = 27.7 m, design discharge per unit (Qd) = 4.0 m3 / s, power house elevation = +529,0 m. Turbine planning includes calculation of rated power output, type selection and number of turbines, specific speed velocity and runaway speed, runner diameter, turbine elevation setting, spiral casing and draft tube dimensions and pre-powerhouse design. Turbine performance and stability including pressure rise, speed rise and weighted average efficiency are also planned. Planning is based on calculations from international standard hydro powerplant planning guidance. The results of the calculations are verified by software and catalog of turbine manufacturers. The turbine specification results are as follows: 2 horizontal francis units, rated output power / unit (Pr) = 1000 kW (1 MW), turbine spin (n) = 600 rpm, turbine efficiency (T) = 0.92, (ns) = 298.6 rpm (M-kW), runaway speed = 1219 rpm, runner diameter = 0.769 m, runner weight (WR) = 294.05 kg, total turbine weight (WT) = 3060,37 kg. The stability of turbine operation is declared safe where the value of speed rise and pressure rise are 44.39% and 19.39% respectively. While the performance as a warranty from turbine manufacturers expressed with the value of weighted average efficiency of 88.67%
Analisa Teknoekonomi Biogas Dari Eceng Gondok dengan Stater Kotoran Sapi
Full text linkWater hyacinth is a waste that can be utilized by the community as an alternative potential for biogas energy. The formation of biogas from water hyacinth requires a residence time (LT) that is still long, which is between 30-35 days for the formation of methane. So that the process of forming methane is not too long, a stater is needed so that methanogenic bacteria can increase from cow dung so that the residence time is much shorter. The process of making biogas starts from making a digester, the process of taking water hyacinth by chopping water hyacinth, preparing cattle dung stater. The purpose of this study is to analyze technically and economically biogas from water hyacinth with cow manure stater. This research was carried out through several stages, namely: preparation of raw materials, stater and plastic biogas digester and techno-economic analysis. In this study the ratio of raw material 1: 1 (water hyacinth chopped 20 kg, water 20 kg) and the addition of stater cattle dung 6 kg.
The results of this study are that the technical aspects of biogas start production after 10 days of filling the digester at pH 7.1. Biogas produced is known by direct flame test. Visible on the 10th day the resulting flame is still small, but this shows that the gas has been formed. The pH of the digester is between 4.7 and 8.5. The decrease in TS value from the inlet which is 46 kg to the outlet is 28 kg, indicating that there has been degradation in the substrate in the digester. On the economical aspect the investment cost of a biogas installation in a synthetic digester is IDR 1,500,000.00. Variable costs are the cost of water hyacinth, cow dung and water of Rp 150,000.00 per year. The Cost of Biogas Production is Rp 3,836.08 and if it is sold at a margin of 50% the selling price is Rp 5,800. The break even point in kilograms is 267.2 and in rupiahs is Rp 1.025,000.00. This payback period for investment in biogas business is 2.86 years
Analisis Kenyamanan dan Kestabilan Kendaraan Roda Dua Dalam Tinjauan Satu Derajat Kebebasan
Full text linkThe two most important parameters in driving are comfort and stability. To get the best value from that parameter, then the role of the vehicle suspension system is very important to reduce the vibration due to road waves and keep the wheels sticking above the road. This study studied the effect of suspension type on comfort level and vehicle stability. The type of suspension is related to the value of spring stiffness and its damping value. While the vehicle is modeled in one degree of freedom. The test is carried out with vehicle loading including mass of vehicle and passenger for each type of suspension, ie soft, medium and hard. Vibration analysis is done using Matlab Simulink to get the acceleration response and its deflection response. The vibration response graph shows the comparison of comfort level and vehicle stability on the road profiles modeled in step, impulse, and sinusiodal functions. From the simulation results obtained that Soft and Medium Suspension can handle the vibration very well especially from the level of response speed for a relatively flat road. Meanwhile, Suspension type Hard very good damp vibration for high wavy road
Desain dan Analisis Perubahan Fluks Magnet Terhadap Efek Peredaman Pada Prototipe Suspensi Pintar
Full text linkThe vehicle is one of basic needs for supporting mobility of people. Comfort and safety are demanded in every vehicle, especially in its suspension system. The existing suspension systems can’t maximize comfort and safety because it is still hydraulic and pneumatic based, without magnetic system. The purposes of the analysis is building magnetic suspension system with variations at the amount of coil and analyzing absorbing time. The methods of the analysis are determining concept, making the designs, determining components specification, making device block diagram, making wiring diagrams, making the device, taking the absorbing time datas, and the analyzing the data. The results of the analysis are the amount of coil is straight compared to the magnetic force and absorbing time. The most significant solenoid is the one which has 900 coils and has absorbing time at 9.6 seconds
Optimalisasi Variasi Volume Resin Komposit Serat Limbah Karung Glangsing
Full text linkThe waste of sacks glangsing of rice, fertilizer, sugar, animal feed and others can cause serious problems, example in the household scale causes the storage process in the warehouse very difficult because takes place, also invites mices to come. And on a larger scale the excessive use of sacks of glangsing causes waste and pollution to the soil due to the difficult and time-consuming decomposition. Efforts to utilize waste sacks glangsing are make it as a reinforcing fiber composite material. It is expected to be an alternative fiber replacement fiber material available on the market. The stiffness or flekstural test is taken to show comparison the composite. The composite material (with glass fiber reinforce) which made in equal thickness and simultaneously, showed that the resin volume of 15 cc applied to fiberglass fiber with an area of 180 x 180 mm, with 3 layers have a deflection 1.2 mm at 31.5 grams load. While the volume of 30 cc resin gives a deflection 0.25 mm at the same load. While specimens that use glangsing sack fiber did not provide a good enough stiffness. At 31.5 gram load the deflections are very large 12 mm for 15 cc resin volume, and 9.8 mm for 25 cc resin volume, and 4.5 mm for resin volume of 30 cc, and 4.5 mm for resin volume 45 cc. Beside a large deflection, the composite with sack glangsing fibers is apparently subjected to delamination (exfoliation). Therefore, the use of glangsing sack fiber is not recommended
Analisis Regresi Kecepatan Angin Terhadap Daya Turbin Angin Jenis VAWT Tipe Darrieus-Savonius
Full text link The Darrieus-Savonius (DS) wind turbine has been widely developed with the aim of improving turbine performance that has been designed. DS wind turbine is a combination of two type of wind turbines, that is Darrieus and Savonius turbine, both turbines are intentionally developed In order to get self-starting on turbine Savonius with low wind speed and able to extract the speed of engine into energy well at high wind speed through Cherrie Darrieus. This study was conducted to analyze the performance of the DS turbine in the wind speed to be energized through the turbine rotation and power to be generated. The DS wind turbine is designed to start rotating at a speed of 8 m/s in velocity of wind, meanwhile the maximum power generated by turbine is 48,23 Watts. 
Pengaruh Media Pendingin Terhadap Kekerasan Baja Tahan Karat Martensitik Type 431 Pada Proses Hardening dan Tempering
Full text linkStainless steels consist of several types such as Austenitic, Ferritic and Martensitic, Martensitic is one of the stainless steels that has a hardenability property, so it is suitable to be used as cutting tool components which require high hardness and corrosion resistance . The purpose of this study was to obtain information about the hardness of stainless steel martensitic type of hardening results with variations of cooling media. Methods of research used were experiments, ie hardening process by heating the material up to 1100oC temperature, held for 30 minutes, then cooled quickly on water, oil and the air, then heated back to 400oC temperature, cooled slowly, the results tested the hardness of Rockwell C method The results showed the type of stainless steel type martensitic 431 increased significantly after the Hardening process of 21.20 HRC before hardening, and after the hardening process to 47 , 6 HRC with water cooling, 47.9 HRC with oil cooling medium and 46.5 HRC for air cooling media, hardness after tempering down ranges from 6-7 HRC to 41.7 HRC for hardening with water cooling medium 41, 2HRC hardening results with oil cooling medium, and 40,4HRC un tuk hardening results with air conditioning medium