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Pendeteksian Fitur Lubang Tembus pada Model 3D untuk Pembuatan Alur Pahat Pengeboran
Get PDFLubang tembus merupakan fitur yang amat banyak terdapat pada berbagai produk, maka proses pendeteksian fitur ini secara otomatis untuk pembuatan alur mata pahat (tool path) proses pengeborannya menjadi hal yang menarik untuk dibahas. Keseluruhan proses ini dibuat berbasis model 3D faset dengan tipe sterolythography (STL). Identifikasi lubang tembus dilakukan dengan mengidentifikasi volume solid dan volume kosong pada model, sekaligus mengidentifikasi koordinat pusat, diameter dan kedalaman lubang menggunakan data koordinat dan normal segitiga model faset, sehingga memungkinkan proses pembuatan alur pahat dilakukan sesuai dengan data yang telah didapatkan. Serangkaian algoritma disusun dan diimplementasikan pada beberapa model 3D yang memiliki fitur lubang tembus. Berdasarkan hasil pengujian, algoritma ini terbukti dapat mendeteksi fitur lubang tembus lengkap dengan data-data yang dibutuhkan untuk pembuatan alur pahatnya.Kata kunci: lubang tembus, model faset, alur paha
Pengaruh Alternator Terhadap Daya Pada Rancang Bangun Mobil Listrik TMUG01 (Effect of Alternator to Power in Design of Electric Car TMUG01 )
Get PDFPengembangan sumber energi yang dapat diperbaharukan semakin meningkat sebagai antisipasi makin berkurangnya sumber energi yang berasal dari fosil seperti minyak bumi dan batubara. Peningkatan harga minyak mentah dunia secara langsung mempengaruhi harga bahan bakar minyak (BBM) di dalam negeri sehingga perlu mencari bahan bakar alternatif selain minyak bumi atau berusaha menghemat konsumsi bahan bakar. Kendaraan merupakan salah satu sarana terpenting dalam transportasi yang banyak menggunakan bahan bakar dari minyak bumi. Tujuan dari penelitian ini adalah perancangan dan pembuatan mobil listrik TMUG01 menggunakan motor listrik arus searah (DC) dan alternator. Batasan perancangan yaitu beban pengemudi, kecepatan maksimum dan lokasi pemakaian. Tahap proses perancangan adalah desain bentuk dan dimensi bodi mobil, sistem kemudi, sistem suspensi, sistem transmisi serta material yang digunakan. Mesin penggerak motor listrik DC 48 V 30 A, sumber energi 6 accumulator 12 V 5 A dirangkai 3 seri dan 3 paralel serta alternator 12 V 45 A. Hasil menunjukkan bahwa penggunaan alternator pada mobil listrik TMUG01 dapat meningkatkan daya sehingga jarak tempuh lebih jauh dan waktu pemakaian yang dapat lebih lama dibandingkan sebelum menggunakan alternator.Kata kunci : mobil listrik TMUG01, motor listrik DC, accumulator, alternato
Potensi Penghematan Energi Pada Industri Farmasi
Get PDFThis research is focus to identify and calculated energy saving potential in pharmaceutical industry. Energy audit procedure is done by measure electrical power for each electrical industrial devices. Monthly electricity consumption for two years is investigated to know electricity pattern for this industri. Elctricity pattern can be used to measure electricity efficiency of this industry. The result show that this industry is over estimate on power supply from the grid. It’s investigated that 3.835.178,-IDR/month is loss. By using 200 kW gas/diesel cogeneration engine will be save 65.8 kW power.Keywords: energy saving, audit energy, energy efficiency, cogeneration, pharmaceutical industr
KAJI PENGGUNAAN METHANOL SEBAGAI REFRIGERAN UNTUK MENINGKATKAN EFISIENSI TERMAL SISTEM PENDINGIN KONVEKSI DENGAN UNDERGROUND THERMAL STORAGE TANK
Get PDFAbstract Convective roof cooling operates using water as refrigerant. It consists in convection process pass through over the roof, thus decreasing the roof temperature. This system has a great potential to provide thermal comfort in places where roof temperature is low. However, thermal efficiency from the previous research which it is use water as refrigerant is still low. A way to solve this problem is to use methanol as a refrigerant. Following, this paper analyzes some operation parameters such as: roof and room temperature and heat transfer rate. The paper shows the conditions for the best operation point, with regard to thermal conditions of roof and room temperature.Keywords: wind, turbine, electrical power
Effect of Cutting Parameter Variation on Drilling of AISI 1045: Experimental and Simulation
No full textThis work is focused on the study of the effect of spindle speed and feed rate on the tool temperature distribution in the drilling of AISI-1045 steel. The e data were collected under different cutting conditions. The maximum tool temperature is predicted during the drilling using finite element simulation techniques. The predicted temperature was compared to the measured temperature. The result shows the finite element simulation is reasonable. Analyses show that the range of temperature from 157 °C to 288 °C. The difference between measured temperature and simulated temperature are in the range of 17-38%. The s increased in accordance with the increasing of cutting speed and feed. Keywords: drilling, spindle speed, feed, tool edge, maximum temperature.
Studi Perilaku Kegagalan Sambungan Las Tipe TConjunctions Pada Baja Karbon Rendah Dengan Pendekatan Experimen dan Numerik
No full textThis research is conducted to investigate failure behavior of welding structure in T-conjunctions type. Welding joint failures were analyzed by both experimental and finite element analysis (2D) approach in terms of stress intensity factor mode I (KI). The stress at the welding zone was strongly influenced by specimen geometries and the ratio of L/h1. The stress intensity factor (SIF) was increased significantly. Whereas, the minimum SIF of specimen #X1 and #Y3 are 58 MPa.√m and 165 MPa.√m, respectively. Failure of welding specimen was more dominated in the zone with the highest stress concentration and also affected by material discontinuity at which the stress was not generated continuously, but localized in any certain area. Specimen without welding did not yield a maximum stress. However, plastic zone formation locally decreases the stress concentration. Discontinuity in the welding specimen does not give rise to plastic stream, thus it will raise the stress concentration at the welding extension region. Discontinuity can be observed by the Von Misses stress pattern at stress welding zone for the welding specimen whereas the specimen without welding was only occurred near the extension zone. Keywords : T-type conjuction welding, stress intensity factor (SIF), Von Misse stres
PEMBUATAN PROGRAM PERANCANGAN TURBIN SAVONIUS TIPE-U UNTUK PEMBANGKIT LISTRIK TENAGA ANGIN
Get PDFThe Savonius Wind Turbine is a drag type vertical axis wind turbine, and it operates by cupping and dragging the wind, causing the rotor to turn and generate electricity. The Savonius Wind Turbine usually has about two or three scoops or cups to catch the wind. The design allows the turbine to rotate relatively slowly, however, there is a high torque yielded from the rotation.On this research, the wind turbine Savonius type-U is designed using Matlab 7.0 with the design process starts from the needs of electrical power 100 watts and 12 volt electrical voltage and wind speed 8 m/s so obtained what is the magnitude and width of the radius of the wind turbineKeywords: wind, turbine, electrical power
FLUKTUASI GAYA PADA PIPA SAMBUNGAN T AKIBAT ALIRAN DUA FASA CAIR-GAS
Get PDFAliran dua fasa memiliki ketidakstabilan karena pada satu saluran terdapat dua fasa yang berbeda, yang mengakibatkan gaya yang ditimbulkan setiap fasa berbeda-beda. Ketidakstabilan aliran dua fasa dapat mengakibatkan masalah keamanan pada komponen-komponen power, heat transfer, boiler, evaporator, reaktor nuklir maupun dalam berbagai sistem proses kimia, terutama pada percabangan tipe T. Untuk itu perlu mengetahui fluktuasi gaya pada dinding percangan pipa tipe T yang disebabkan oleh aliran dua fasa terutama cair-gas.Penelitian ini menggunakan aliran dua fase dengan variasi debit udara dan air yaitu 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, dan 50 lpm untuk udara serta 3, 5, 10, 15, 20, 25, 30, dan 35 lpm untuk air. Dan menggunakan strain gauge tipe GFCA 3-50 untuk membaca remangan yang terjadi pda pipa sambungan T.Hasil penelitian ini menunjukkan adanya fluktuasi gaya akibat aliran dua fasa cair-gas dan memiliki nilai yang berbeda untuk setiap pola aliran. Dimana dari setiap pola aliran tersebut memiliki nilai gaya puncak yang berbeda-beda. Gaya terbesar terjadi pada saat pola aliran gelembung (bubble) yakni 0,2938 N Fluktuasi gaya yang besar terjadi pada pola aliran sumbat liquid (slug).Kata kunci: Cair-gas, gaya, pola aliran, pipa sambungan
Analisis Uji Destructive Dan Non Destructive Terhadap Hasil Sambungan Las V-Tunggal Baja AISI 1045
No full textThis paper reports the result of study on the strength behaviour of welded joint both destructive and nondestructive testing. The parent metal choosen for the testing was AISI 1045 steel with main parameters of single-V welded form and horizontal welding position. The electrodes used for each parameter were AWS E-7016 LB-52 with diameter/amperes of 2.6 mm/80 Amp, 3.2 mm/110 Amp, and 4.0 mm/130 Amp. The specimens were nondestructively tested using the well-known radiography X-ray according to ASTM-1A for detecting welding flaws and its size. Chemical composition test was performed for the material of parent and welding metal. Tensile testing was performed to destructive based on the ASTM E-8 standard for tensile test. The results show that the tensile strength of the weld joint is reduction by about 28% compared to the parent metal without welding. The reduction in tensile strength is believed to be caused by welding defect, include porosity, inclusion, incomplete penetration, and reduction in carbon content from 0.5% in parent metal to about 0.1% in the welding region. Keywords: smaw, tensile strength, welding defec
Pengaruh Posisi Terhadap Kekuatan Baut dan Gaya Geser Ditinjau dari Morfologi Fracture Surface pada Sambungan Plat
No full textBolt extension as link which do not destroy connective by component at process unload tide used many in so many industrial area like at bridge construction, building construction and various appliance of engine tool. Usage of amount 3 (bolt fruit three) at 5 (standard hole five) at one particular extension construction can be seen at tacking on two plate with bevel form at building roof construction. If usage more at one particular construction extension hence will have an in with wide of section, apart between hole at each bolt as well as its esthetics value. Formation arrange situation an bolt extension at one particular construction very having an effect on to failure of extension construction, is in this case done conducted by examination to an extension construction by 3 bolt fruit at 10 position differ from the target of searching optimal position in accepting style shift at bolt extension construction used by bolt is galvanic type have full of thread to. Is later got by tension value shift at each bolt and got by optimal position (strong position) and weak position from 10 existing position in accepting style shift [at] extension construction. Optimal position in this experiments are position 2 and 4. The position not optimal is position 6. Keywords: fracture surface, bolt , optimal position of bolt, deformation