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Muhamad Jafri
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LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 216 Documents
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Waktu Gesek Terhadap Kekuatan Tarik Sambungan AA6061-Baja Karbon Pada Pengelasan Gesek Continuous Drive Jack C.A. Pah; Defmit B.N. Riwu; Dominggus Adoe; Adi Y. Tobe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5940

Abstract

The objective of this research was to get the effect of friction time on the tensile strength of the joining of aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction time of this research were 5 seconds, 7 seconds, 9 seconds, and 11 seconds. Other friction welding variables were friction pressure 24 MPa, forging pressure 79 MPa, forging time 60 seconds, and friction rotation speed 1600 rpm. The independent variable was the ultimate tensile strength of the welded joint. The results showed that the relationship between friction time and ultimate tensile strength is not linear, with the increase in friction time. The increasing of friction time, caused the ultimate tensile strength increase to a maximum value and then the ultimate tensile strength of the joint will decrease sharply. The greatest ultimate tensile strength is obtained at a friction time 9 seconds, with ultimate tensile strength 111.89 MPa
Pengujian Rumah Pengering Daun Kelor Dengan Efek Rumah Kaca (Solar Dryer) Melalui Mekanisme Konveksi Alamiah Aloysius V.P. Piamat; Verdy A. Koehuan; Muhamad Jafri
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5941

Abstract

This research was conducted by experimental study of moringa leaf drying process using ultra violet plastic dryer house (UV solar dryer) through natural convection drying mechanism. The results showed that the final water content of moringa leaves after drying for two days (8 hours) was 54.88 %bb with a total drying rate of 0.417 kg/hour from the assumed initial water content of 80 %bb. While the average drying efficiency of 3.49 % with specific energy consumption (KES) is quite high, which is 127180.77 kJ/kg. The highest specific energy consumption (KES) occurred on the 2nd day test at 200056.37 kJ/kg with the lowest efficiency of 2.154 %, while the lowest KES on the 1st day test was 54305,17 kJ/kg with the highest efficiency of 4.83 %. This phenomenon is very clear the influence of changing environmental weather on the drying process in the drying house. Environmental weather is very influential on the process of drying moringa leaves with a natural convection mechanism using ERK type dryer. Cloudy weather with high humidity will increase the humidity in the dryer house through the water vapor content in the air that enters through the air ducts
Analisis Pengaruh Perlakuan Alkali Terhadap Wettability Serat Tunggal Widuri Dominggus Adoe; Yeremias M. Pell; Beni Sanak
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5942

Abstract

Along with its development, composites do not only use synthetic fibers, but there are already composite reinforcing materials made from natural fibers. The advantages of natural fiber as a reinforcing material for composite materials are: the ratio between strength and density is quite high, corrosion resistance, low cost and easy manufacturing process. The use of natural fibers as reinforcement for polymer materials provides opportunities for some natural fibers to be used as reinforcement for polymer composites, one of which is thistle fiber. The treatment used was alkaline treatment (NaOH) with percentages of 2%, 3%, 4%, 5%, 6%, and 7%, respectively, and the soaking time of 30, 60, 90, 120 minutes, and fiber. Widuri bark without treatment as a comparison. The purpose of this study was to determine the effect of the concentration of alkaline solution and the duration of immersion on the wettability of single widuri fibers. Single fiber testing refers to ASTM D3379 standard. From the results of the fiber contact angle test with 6% NaOH treatment for 120 minutes with a cos price of 0.906725322 with a droplet geometry that tends to be barrel. Meanwhile, fiber treated with 3% NaOH for 60 minutes had the lowest cos value of 0.472037963 with a droplet geometry that tends to be clam-shell
Analisis Pengaruh Variasi Tekanan Dan Dimensi Briket Sekam Padi Terhadap Temperatur Dan Lama Nyala Api Melvani E. D. Tana; Defmit B.N. Riwu; Adi Y. Tobe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5943

Abstract

This research was conducted to determine the effect of variations in pressure and dimensions of rice husk briquettes on the temperature and duration of the flame. The mashed husk charcoal is mixed with 50 ml of water, 160 grams of starch and 450 grams of rice husk charcoal, stirred until evenly distributed. The process of molding charcoal briquettes that have been mixed and then printed, uses molds with diameters of 1 in, 1.5 in and 2 in, with different briquette pressure variations, pressure variations using sizes 0.1 MPa, 0.2 MPa, 0, 3 MPa, 0.4 MPa. The briquettes are then dried in the sun for three days to dry. From the research, it was found that the variation of pressing pressure affects the characteristics of the flame and the dimensions of the burning of rice husk briquettes. The highest temperature was recorded at 749 0C at 1.5 In briquette size and the pressing pressure was 0.2 MPa. At this size, the longest flame is 18 minutes
Modifikasi Alat Pemarut Kelapa Sistem Mekanis Dengan Mata Pisau Setengah Lingkaran Marten E. Manane; Daud P. Mangesa; Defmit B.N. Riwu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5944

Abstract

Today's increasingly rapid technology encourages people to continue to innovate in creating facilities and infrastructure to improve work efficiency and effectiveness. The aim of this research is to modify the mechanical system coconut grater with a semi-circular blade equipped with a coconut shell clamp. The manufacture of this coconut grater tool with a semi-circular blade uses the standard VDI 2221 design method. The design and technical drawings of the tool use the Autodesk Inventor software 2008 and the design is then realized according to the technical drawings. The result of this research is a coconut grater with a driving motor power of 0.2 kW. In this study, this coconut grater tool was used in grating coconut whether it worked according to the design drawing or not. The end result of making this tool is that it can be successfully made and can be used
Karakteristik Pembakaran Premixed Minyak Fame (Fatty Acid Methyl Ester) Defmit B.N. Riwu; Dominggus Adoe; Reinaldy Weo
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5945

Abstract

Advances in technology and the times have caused the human need for energy to increase. This condition has an impact on the availability of fuel oil which is decreasing and will run out. To anticipate and prevent these problems, new alternative energy sources are needed as a substitute for energy sources that cannot be replaced. One alternative energy is FAME (fatty acid methyl ester) oil. FAME is a type of fatty acid ester derived by transesterification of fats with methanol. This research was conducted to determine the combustion characteristics of premixed FAME oil in the form of flame temperature and combustion speed. The results of the study, the greater the equivalence ratio, the smaller the flame temperature and combustion speed. This is because less air is available to burn the fuel. On the other hand, the smaller the equivalence ratio, the higher the flame temperature and combustion speed. This is because more and more air is available to burn the fuel. And at the time of equivalence ratio = 0.96, combustion is rich in air and close to the stoichiometric combustion. The angle of fire obtained is directly proportional to the speed of combustion.
Desain dan Analisis Barrier Gate Otomatis Berbahan Komposit Serat Glass dan Serat Daun Gewang (Hibrid Polyester) pada Bagian Palang Afrianus Serfano; Erich U.K. Maliwemu; Ishak S. Limbong
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.6011

Abstract

Barrier Gate is a stopping mechanism that has a function for the security of a place such as the entrance to an office or agency. The design and analysis of the construction of the automatic barrier gate made of glass fiber composite and leaf gewang fiber (hybrid polyester) aims to limit crowds so that safety and comfort are always maintained. This test uses software solidwork 2015. The results of the analysis of three variations of the crossbar components are, variation 1 with a maximum stress of 12.255 Mpa, variation 2 with a maximum stress of 10.217 Mpa and variation 3 with a maximum stress of 37.359 Mpa. Of the 3 variants, the one that produces the better stress is variant 3 with a length of 250 cm width 3 cm and a thickness of 4 cm which gets the largest with a value of 37.359 MPa. Static analysis of frame components with a length of 40 cm width 40 cm and a height of 100 cm, resulted in a maximum stress of 7.499 MPa and a maximum displacement of 0.134 mm.
Studi Karakteristik Aliran di Jaringan Perpipaan Menggunakan Perangkat Lunak Epanet 2.0 (Studi Kasus di Laboratorium Teknik Mesin) Kurniawan Rifai; Matheus M. Dwinanto; Wenseslaus Bunganaen
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.6349

Abstract

Water is a basic human need both for the needs of daily life, starting from the need for drinking, cooking, and sanitation purposes. For this reason, it is necessary to plan and analyze the piping network in a building using either a gravity system or a pumping system. The mechanical engineering laboratory is one of the buildings within the Mechanical Engineering Study Program, Faculty of Science and Engineering, Nusa Cendana University which already has a piping network for distribution of clean water to the bathroom. However, until now this clean water supply has not utilized the reservoir with the existing tower near the laboratory. So, it takes software that can help, to determine the flow characteristics in the pipeline network. The piping network simulation method uses EPANET 2.0. The flow of water in the analyzed piping network is the reservoir to the bathroom. This research was conducted by analyzing the head and pressure in the piping network that will be installed in the Mechanical Engineering Laboratory using EPANET 2.0 software and analyzing losses in the pipeline network based on EPANET 2.0 software. The stability of the distribution of clean water, and the analysis period was carried out for 8 hours (extended period) with the condition of the water flow in each pipe in an open condition
Analisis Performa Pompa Air DAB Tipe DB-125b Sebagai Turbin Dengan Variasi Head Dinamik Nabuasa, Meinase K; Koehuan, Verdy A.; Nurhayati, Nurhayati; Jafri, Muhamad
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 01 (2022): April 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i01.7268

Abstract

The research was conducted through experiments on pumps that functioned as turbines in this study, namely regenerative pumps or peripheral pumps, namely the DAB water pump type DB-125B. Peripheral pump is a centrifugal pump whose impeller has radial blades in bulk of 41 blades. The performance or performance of the PAT system for regenerative pumps or peripheral pumps, namely the DAB type DB-125B water pump as a hydroelectric power plant, was analyzed with variations in flow rates of 35 ltr/min, 40 ltr/min, and 45 ltr/min. The performance or performance of the PAT system of regenerative pumps or peripheral pumps, namely the DAB type DB-125B water pump as a small-scale hydroelectric power plant from experimental results with variations in flow rate shows a maximum shaft power of 5.849 W with an initial discharge at no-load of 40ltr/min. The addition of water power can directly increase the rotation of the PAT shaft, as well as with the addition of the flow rate at the head, the rotation of the turbine rotor also increases. While the addition of the flow rate, the maximum output power and PAT efficiency tend to occur at higher rotations than at low flow rates. The efficiency of PAT in this flow discharge variation reaches its maximum value at turbine rotation of 850.3 rpm of 17.39%, followed by variations of flow rate of 45 ltr/min and 35 ltr/min, each of which is 11.14% at 566.3 rpm and 8.74% at 1440.7 rpm.
Analisa Potensi Gelombang Laut sebagai Sumber Energi Terbarukan Menggunakan Perangkat Oscillating Water Column (OWC) Di Wilayah Perairan Laut Timor Jasron, Jahirwan Ut; Mangesa, Daud P.; Boimau, Kristomus; Tarigan, Ben V.; Maliwemu, Erich U.K.; Salombe, Mexin
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 01 (2022): April 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i01.7269

Abstract

An in-depth study is needed on the use of alternative energy to overcome human energy needs. This study aims to analyze the potential of ocean wave energy that can be converted by the "Oscillating Water Column" device on the Kolbano coast as a renewable energy source. Kolbano Beach is located in Kolbano Village, Kolbano District, and TTS Regency (South Central Timor) East Nusa Tenggara Province with an area of​approximately 17 sq km stretch of Kolbano beach area facing the Indian Ocean so that the consistency of the wave height produced is quite large. The wave height is large enough to be used as an alternative power plant. This research was conducted in Kolbano coastal waters, data on wave height and wind speed from BMKG (Metrology, Climatology, and Geophysics Agency) Kupang City in 2019 – 2021m with wave heights ranging from 0.31 to 2.3 m and wind speeds ranging from 1 .05 to 8.48 Watts.

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