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INDONESIA
Jurnal Teknik Mesin
ISSN : 18298958     EISSN : 26555670     DOI : -
Jurnal Teknik Mesin adalah sebuah jurnal peer review yang didedikasikan untuk publikasi hasil penelitian yang berkualitas dalam bidang teknik mesin.
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Articles 6 Documents
Search results for , issue "Vol 13 No 2 (2020): Jurnal Teknik Mesin" : 6 Documents clear
Purwarupa Pembangkit Listrik Tenaga Ombak Dengan Konsep Oscillating Water Coloumn (Skala Laboratorium) Yeddid Yonatan Eka Darma; I.G.N.A Satria Prasetya D.Y; Heri Inprasetyobudi; Moh Nurpambudi Hidayat; Diky Nurwahyudi
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.408

Abstract

Electricity energy demands for peoples near the sea are same high as people in the city, but sometimes electricity in coastal residence are nearly forgotten. In that case we need an alternative energy source for electricity generation using friendly environmental and renewable energy to maintain the availability of electrical energy. One of the energy alternative is sea wave power such as Oscillating Water Column (OWC) system. The Oscillating Water Column system have three main components, such as the chamber, air turbine (wells turbine) and generator. The chamber function is a place for oscillation between water and air, then the function of water turbine (wells turbine) is to capture energy (air flow) that will be used to rotate the generator, that producing electrical energy. This turbine is 22 cm in diameter and will use the NACA0012 airfoil. This research was conducted to design an oscillating water column on a laboratory scale. This research is expected to be the beginning of renewable energy development sources and as the alternative energy source for the community in Banyuwangi.
Uji Eksperimental Pengaruh Panjang Chord Sudu Terhadap Kinerja Turbin Angin Sumbu Vertikal Eva Hertnacahyani Herraprastanti; Muhamad Najib Mubarok; Sarip Sarip; Hendri Suryanto
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.390

Abstract

Indonesia's petroleum production continues to decline while energy demand continues to grow. As a result, there was an increase in imports of crude oil and imports of fuel oil products. The government issued a number of policies to reduce fuel use. One of the efforts is to manage renewable energy power plants such as wind energy. The wind turbine is a windmill that is used to generate electricity. The basic principle of working of a wind turbine is to convert wind energy into mechanical energy at the mill, then the rotation of the mill is used to rotate the generator which will produce electricity. One of the things that need to be considered in designing wind turbine blades is the size (radius of the rotor), airfoil section, chord length, and blade pitch angle. The blade chord length is the length of the straight line connecting the front and rear edges of the turbine blade. The purpose of this study was to determine the effect of blade chord length on the performance of a vertical axis wind turbine, including shaft rotation, wind power, generator power, rotor power, torque, Tip Speed ​​Ratio (TSR) and power coefficient. This research was conducted using a vertical axis wind turbine, with 4 L-type blades made of 60 mm thick aluminum plate, with variations in chord lengths of 140 mm, 170 mm, and 200 mm. From the results of the tests that have been carried out, it can be concluded that the chord length affects shaft rotation, wind power, generator power, rotor power, torque, Tip Speed ​​Ratio (TSR) and power coefficient.
Pengaruh Temperatur PWHT Terhadap Struktur Mikro, Uji Kekerasan Dan Uji Tarik Pada Proses Pengelasan Gas Metal Arc Welding (GMAW) Aluminium 5083 Adhi Novianto; Ipick Setiawan; Agus Pramono
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.415

Abstract

PWHT (Post Weld Heat Treatment) is one way to improve microstructure changes and can increase the tensile strength and hardness of the welding process. The purpose of this study was to determine changes in microstructure, hardness values, and tensile test values ​​with temperature variations of PWHT and without PWHT. The finished metal is then given a PWHT temperature variation on aluminum alloy 5083 with a temperature variation of 150 ° C, 250 ° C, 350 ° C with a heating rate of 100 ° C and heating of 80 ° C for 1 hour and a holding time of 1 hour according to The variation that has been set is continued with cooling 30 ° C for 8 hours of natural cooling in the chamber furnace machine. The results of this study indicate that changes in the microstructure due to the higher temperature of the PWHT process will reduce the concentration of porosity formed, which has a correlation with the resulting tensile strength. For the results of the tensile strength from the process without PWHT using temperature variations, the PWHT process has increased for that by doing this PWHT process greatly affects the tensile strength. The highest tensile strength is at the PWHT temperature variation of 350 ° C (263.65 MPa) compared to specimens without PWHT (253.52 MPa). Meanwhile, the hardness value is not very influential by using temperature variations of PWHT or without PWHT, the hardness value using temperature variations of PWHT 150 and without PWHT in the weld metal area (74.4 HV).
Pengaruh Temperatur Dan Waktu Penahanan Terhadap Sifat Mekanik Dan Struktur Mikro Pada Baja Karbon Rendah Rhaka Qudzsy Wening Praja; Iman Saefulloh; Agus Pramono
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.418

Abstract

Basically the characteristic of steel products that is widely used in the construction process is structural steel. In order to compete with structural steel foreign-made, a standards compliance is a minimum requirement that must be done. To meet the JIS G 3302 grade SGC 400 standard, the results of the cold rolled process and continued with Cyclic Spheroidizing on 0,11% carbon steel, resulted in an elongation value that met the standards, but the yield strength and tensile strength were below standard. So that a heat treatment process substitution is needed so that 0,11% carbon steel can meet the JIS G 3302 SGC 400 standards. The aim of this research is to determine the effect of temperature and holding time with the cyclic treatment method on the microstructure and mechanical properties of 0,11 steel % carbon. Also in this research , 0,11% carbon steel was subjected to a heat treatment process with a 3-cyclic method at temperatures of 575, 625, 675°C, then cooled in air blower then given a holding time of 4, 6, 8 minutes. Then 0,11% carbon steel was subjected to tensile test, Vickers hardness test and scanning electron microscope as well as energy dispersive spectroscopy-Mapping. From the temperature variation of 625°C with the cooling medium of the blower produces mechanical properties that meet the JIS G 3302 SGC 400 standard.
Pemanfaatan Material Baja X-Ses Di Kota Cilegon Sebagai Material Bilah Golok Banten Deprilen Dacha; Iman Saefullah; Haryadi Haryadi
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.461

Abstract

Sulangkar machetes is one of the typical Banten machetes that have strong cultural values. Sulangkar means “sulang” and “sekar” which means stacked with two different materials. The lack of raw materials is a problem in the process of making sulangkar machetes. In this study, the combination of SS400 Steel and Leaf Spring Steel was observed for its mechanical properties as the raw material for Sulangkar machetes. In this study, Sulangkar machetes material consists of three layers of material, two layers of SS400 steel and leaf-spring steel inserted in the middle. The three-layers material are forged after being heated to a temperature of 750°C in a furnace. The material that has been forged then tested for tensile strength, toughness and hardness. The results of the tensile test showed that the leaf spring steel has the highest strength value of 1324.52 Mpa. The results of the Impact test show that the SS400 material has the highest Impact value of 163 J. The hardness test results show that the combination material has the highest hard value of 716.89 HBW.
Perancangan Mesin Penggiling Padi dan Penepung Sekam Padi Skala Rumah Tangga Aji Widyanugraha; Aa Santosa; Deri Teguh Santoso
Jurnal Teknik Mesin Vol 13 No 2 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.2.468

Abstract

Rice milling machines and rice husks that are in the community have helped a lot for farmers in terms of rice milling. From the data obtained after conducting the survey, it was found that the rice milling machine and rice husk flour had several shortcomings, including large size and requiring large space, also having a relatively expensive price. To produce bran requires two processing machines, so it is less effective because it takes a long time. The purpose of designing this machine is to combine two milling and flour systems into one to be efficient, and to design a machine with a small size so that manufacturing costs are affordable to farmers. The machine is designed to be operated using the power of a gasoline driving motor which is converted to a mill and flour movement for a one-time rice capacity of 15 Kg and 5 Kg of rice husks. The motor power is 5.5 HP with engine speed of 3600 rpm. The machine uses 3 pulleys with a size of 3 inches, 7 inches, 4 inches and there are 2 V-belts with a length of 76.89 inches and 63.48 inches so that the rotation of the motor which is originally 3600 rpm is reduced by the pulley engine speed to 1500 rpm and 2000 rpm. For the calculation of the pegs, the pin length of the mill shaft is 7.4 mm and the length of the peg shaft is 17 mm. The selection of bearings on the grinding shaft is bearing number 6204 and on the flour shaft bearing number 6202. This rice mill and rice husk flour machine has frame dimensions of 440 mm x 430 mm x 940 mm. Overall, the design results data are declared to fulfill the requirements to be designed and built.

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