Jurnal Energi dan Teknologi Manufaktur (JETM)
Not a member yet
70 research outputs found
Sort by
ANALISIS TEMPERATUR PELAT LANDASAN HOT-GAS WELDING DAN BENTUK BEVEL TERHADAP KEKUATAN TARIK LASAN HDPE
Full text linkWelding has developed rapidly at this time, both for metallic and non-metallic materials, one of the methods used for plastic welding is Hot-Gas Welding. Plastic is a very difficult material to weld due to its low thermal conductivity. The quality of the mechanical properties of the existing plastic welded joints is not close to the strength of plastic objects without welding. The purpose of this study was to determine the effect of variations in the temperature of the base plate and variations in the shape of the bevel during the Hot-Gas Welding process on the tensile strength of HDPE sheet welded joints, to determine the conditions of the interaction between variations in the temperature of the base plate and variations in the shape of the bevel during the Hot-Gas Welding process. HDPE sheet welded joints that produce maximum tensile strength values. In this study, two independent variables were used, namely the base plate temperature (30,70,110,150 C), variations in bevel shape (V, X, U) and three controlled variables which included HDPE plastic material with a thickness of 5mm, using added filler material in the form of HDPE plastic with a diameter of 4 mm and a hot gun airflow heating temperature of 250℃. The tensile test standard uses the ASTM D 638-03 standard and for data processing is done by DOE factorial, as supporting data macrostructural photos of each weld joint are carried out. The results showed that the maximum tensile strength of HDPE welded joints was obtained at the temperature of the base plate of 150°C and the V bevel shape with a value of 18.46 MPa or 84.22% of the parent materia
COMPARISON OF THE FUEL CALORIFIC VALUE FROM PLASTIC PYROLYSIS WITH COMMERCIAL FUEL
Full text linkPlastic, which is originated from petrolum, is possible to turn it to alternative fuel. Moreover in 2008, the estimated amount of midden in Indonesia reached 38.5 million tons per year with the largest compositions are organic waste (58%), waste plastics (14%), waste paper (9%) and wood waste (4%) (Ministry of Environment, 2008). Meanwhile in Depok City, the amount of waste which goes to Depok City’s landfill waste is 350-400 tonnes / day (Head of Technical Unit Landscape Depok City Sanitation Department, 2012). From the data, above, can be confirmed using plastic waste as an alternative fuel can be superior because plastic waste is the raw material which is cheap, easily processed, and can reduce environmental pollution. The processing of plastic waste into fuel conversion is done using a plastic waste machine with a continuous system, the working principle of heating at high temperature. Tests which are conducted in this study is to test the octane rating by bomb calorie meter, test anylizer gas emissions, and test octane gas chromatography. Plastic waste fuel, which is the outcome from plastic waste conversion machine with continuous system, can be used as fuel for vehicles, it is because the plastic oil calorific value 10 519 cal / g equivalent calorific value premium. This research is expected to address the scarcity of fossil fuels, and increasing public awareness of using alternative fuel, especially plastic waste fuel
ANALISA EFFISIENSI PLTU PAITON KETIKA HIGH PRESSURE HEATER (HPH 7) INSERVICE DAN OUTSERVICE
Full text linkNational electricity needs are always increasing, for that the efficiency of power plants needs to be maintained and expected to be improved. To maintain the efficiency of the power plant, it is necessary to feed water system as a provider of feed water before entering the boiler in good condition and one of the equipment is the High Pressure Heater (HPH). In Paiton Power Plant there are HPH numbers 5.6 and 7. This research aims to compare the efficiency of power plants and the losses caused when pltu operates in hph 7 inservice and outservice conditions. The research method used is a simulation in the simulator room of PLTU PT. PJB UP Paiton 1 & 2. From the data obtained then done calculations. Research produces the efficiency value of PLTU when in HPH 7 inservice condition is 33.40% and when outservice is 29.20%. The need for coal to increase the temperature lost due to HPH 7 outservice amounted to 11.11 Tons / hour, so that the losses caused by the increase in coal flow amounted to Rp 1,204.896.000 per year
Pengaruh Variasi Dimensi Sirip Pada Displacer Sistem Pendingin Mesin Stirling Menggunakan Energi Surya Terkonsentrasi
Full text linkEnergy needs in Indonesia are increasing day by day due to population growth and economic growth. To meet the increasing energy needs, it is necessary to develop a variety of alternative energies such as: biomass, solar energy, wind energy, water energy, which are still few that utilize One of the machines that use renewable energy is the Stirling motor. A stirling motor is a type of motor that has an external combustion engine that does not require much maintenance and does not emit a lot of pollutants because it only requires a source of thermal energy to run it. In other words, solar energy can also be utilized. The method developed is the use of solar energy which is concentrated by a parabolic reflector to the hot cylinder of the Stirling engine to convert heat energy into motion energy. The purpose of this study was to determine the effect of variations of several fin dimensions and variations in the number of fins on a displacer with aluminum material. This study uses an experimental method to describe the performance of the stirling engine prototype using various dimensions of cooling fins and variations in the number of fins. The results showed that the gamma stirling engine using 6 fins, and a diameter of 38 mm, showed the best results with a time of 43 minutes with an intensity of solar radiation of 188.2 W/m² to drive the stirling engine with a speed of 189 rpm and a torque of 0.87 N. mm. The difference in temperature produced in the hot cylinder and cold cylinder is 115˚C with a thermal efficiency of 44.13%.
 
Pemodelan Suspensi Kendaraan Dalam Tinjauan Multi Derajat Kebebasan
Full text linkThe two most important parameters in vehicle vibration are the level of comfort and stability. To get the best value from that parameter, the vehicle suspension system is very important to reduce vibration due to road waves and keep the wheels attached to the road. This paper studied the effect of the type of suspension on the vibration of a one-wheeled vehicle in terms of comfort and stability. The type of suspension is related to the value of the spring stiffness and the damping. While the vehicle is modeled with one wheel in two degrees of freedom. The test is carried out by loading the vehicle including the mass of the vehicle and passengers for each type of suspension, namely soft, medium and hard. Vibration analysis was performed using Matlab Simulink to obtain the acceleration response and deflection response. The vibration response graph shows the comparison of the level of comfort and stability of the vehicle on the road profile modeled in step, impulse and sinusoidal functions. From the simulation results, it is found that the Soft and Medium Suspension can handle vibration very well, especially from the level of response speed for relatively flat roads. Meanwhile, the Hard type of suspension is very good at dampening vibrations for high bumpy roads
Peluang Peluang dan tantangan pengembangan teknologi Oscilating Water Column (OWS) di Indonesia.
No full textRenewable energy is one of the government's efforts to increase the source of the national electricity supply and reduce fossil energy sources. Indonesia has the potential to develop renewable energy in the fields of ocean waves, sunlight, water, and geothermal. But of all these, the most promising to become renewable energy development opportunities are water energy, geothermal energy and ocean wave energy. Indonesia as an archipelagic country with an area of 1,904,556 km2 which consists of; 17,508 islands, 5.8 million km2 of ocean and 81,290 million km of beach length, the potential for marine energy, especially ocean waves, is very potential to be empowered as new and renewable alternative primary energy, especially for power generation. This ocean wave power plant has been widely developed, including: buoy type technology, overtopping devices technology, oscillating water column technology. Oscillating Water Column (OWC) is an alternative technology to convert ocean wave energy using an oscillating water column system. The ocean wave conversion technology of the OWC system was chosen because it is suitable in areas with steep coastal topography and has a wave height value between 0.2 m to 1.19 m and even exceeds so that the electricity generated is greater. OWC technology which will be developed for the territory of Indonesia has several opportunities and challenges. Opportunities and challenges that will be faced include the potential for waves, the application of OWC to waterways in Indonesia, OWC systems, and technology investment for the prospect of long-term energy development in Indonesia.
 
ANALISIS DIAMETER KAWAT SPRING DAN PANJANG LOWER MOUNTING SUSPENSI BELAKANG MOTOR MATIC
Full text linkThe stability of the vehicle / motorbike is also determined by the suspension. Usually the suspension on the motor is installed right-left symmetrically. This is so that the vehicle load is evenly distributed if there is a shock / sudden load. But development and need negate each other.
Currently, the development of automatic motorbikes is quite rapid. This motorbike is designed to be sleek and nimble and easy to maintain. Therefore, the rear suspension of the automatic motorbike is installed on only one side. And this usually occurs during sharp turns and high speeds and if you go through uneven roads. For this reason, it is necessary to design the right suspension so that the vehicle can maintain stability even when turning or passing uneven roads. This instability is due to the large vibration of the vehicle. The objectives of this study are 1. To determine the effect of the size of the spring wire and the length of the mounting on the vibration frequency. 2. Find the diameter of the spring wire and the length of the mounting that will give a good vibration frequency. This study uses the Desaign Of Experiment method. Desaign factor 2, namely diameter of spring wire and length of muoting. Level 3 factor is 6 mm, 7 mm and 8 mm diameter. Mounting lengths of 30 mm, 35 mm and 40 mm. Data analysis using MINITAB program. From the analysis, it is found that 1. The diameter of the spring coil wire and the mounting has a significant effect on the vibration frequency of the automatic motor. 2. The best size for wire spring diameter for coil spring motor matic is 7 mm, while the thickness of the mounting is 37 mm.
Keywords: Suspension, Motorcycle, Spring Wire. Lower Mounting, vibration frequenc
Pengaruh Perlakuan Permukaan Pengikatan Terhadap Sifat Mekanik Komposit Serat Kaca Dengan Laminasi Almunium
Full text linkFiber metal laminates or commonly known as fiber metal laminates (FML) are composite structures made by combining 2 layers of material as the outer layer with the core material. The outer layer of this composite is called the laminate. Generally, laminated composites are produced by joining techniques under solid-state conditions, such as diffusion bonding, extrusion, friction-stir welding, and roller welding. In this study, glass fiber composites with aluminum lamination were made using the vacuum assisted resin infusion (VARI) method, using epoxy resin. The surface treatment of the aluminum laminate was carried out with the direction of roughing at certain angles and variations of the surface roughening of the laminate to test the mechanical bonding between the composite and the laminate. Mechanical bonding testing using three-point bending test method (three-point bending) and buckling test. The expected result is that by surface treatment on aluminum laminate, the best mechanical bonding to composites with glass fiber is obtained. The TKT to be achieved from this research is TKT level 3, which is an analytical study that supports the prediction of the performance of the effect of the bonding surface treatment on the mechanical properties of glass fiber composites with aluminum lamination
DESAIN DAN PEMBUATAN JIG AND FIXTURE PEMBENTUK RADIUS LUAR (r = 5 – 20mm) PADA MESIN BUBUT MAXIMAT V-13 DI JURUSAN TEKNIK MESIN POLITEKNIK NEGERI MALANG
Full text linkOn a conventional lathe, the process of forming the outer radius on the workpiece (cylinder) can be directly carried out by installing a jig and fixture to facilitate the small-scale machining process that is applied to the tool holder (carriage) instead of the tool position. it is chisel and the holder is removed. Field surveys are needed to support the data collection process, such as the dimensions of the tool post and the distance of the feeding axis of the Maximat V-13 lathe. From this data, it will be correlated in the form of a jig and fixture design with material selection as a comparison. By involving jigs and fixtures in the practicum process, it can provide additional insight regarding work systems and time efficiency in the production process. So that it can help practitioners / students to recognize some of the supporting parts / components in the overall arrangement of jigs and fixtures
KAJI EKSPERIMEN MASSA REFERIGERANT TERHADAP OPTIMALISASI FUNGSI AC PADA KENDARAAN INOVA DIESEL 2008
Full text linkOne of the functions of the vehicle air conditioner is to provide thermal comfort in the cabin space. Thermal Comfort can provide benefits such as reducing driver fatigue and increasing driving efficiency and safety, so it is important that the temperature of the vehicle is in accordance with human thermal comfort (22.8-26oC). The purpose of this study was to see how much volume and pressure the car air conditioner had in order to get optimal thermal comfort by varying the volume of the refrigerant in the air conditioner and recording the pressure, temperature in the condenser, evaporator and cabin space. The test equipment in this study was a 2008 Toyota Innova Diesel with refrigerant R 134a with a volume variation of 600 grams, 700 grams, 800 grams, 900 grams, 1000 grams and 1,100 grams. The results showed that the more refrigerant volume will make the low pressure and high pressure in the AC system rise. Optimal low pressure (1.5 bar) and optimal high pressure (15.1 bar) were obtained at a refrigerant volume of 700 grams. The relationship between the refrigerant mass and the temperature in the evaporator line has a tendency if the volume of refrigerant plus the temperature in the evaporator line and the cabin will decrease to a certain point the temperature will tend to rise. The pattern which includes the addition of refrigerant mass will reach the optimum cabin temperature (achieve thermal comfort), and then decrease (the temperature will increase). The lowest temperature achieved in the cabin (24.6oC) was at a refrigerant volume of 700 ml