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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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Pengaruh Variasi Media Carburizer terhadap Struktur Micro dan Kekerasan Baja Aisi 1045 bunganaen, wenseslaus; Adoe, Dominggus G. H.; Pady, Aldy
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14279

Abstract

The purpose of this study was to determine the effect of media variations of 90% kusambi charcoal and 10% shellfish, 90% kusambi charcoal and 10% rice husks, and 90% rice husks and 10% shells. Kusambi charcoal 90% and 10% rice husk, 90% rice husk and 10% shellfish. For the microstructure and hardness of steel AISI 1045, the material used in this research is medium carbon steel, the process of making the specimen is done by cutting it into several parts. The cutting is done to make it easier to place the specimens in the carburizing box then 90% kusambi charcoal mixed with 10% shellfish, 90% kusambi charcoal mixed with 10% rice husks, and 90% rice husks mixed with 10% clamshells. The specimens were subjected to a Carburizing treatment at a temperature of 9500C then a Rockwell hardness test and microstructure testing were carried out. From this study, it can be concluded that the highest average hardness value in the mixture of 90% Kusambi charcoal Carburizer and 10% shellfish was obtained at 39.25 HRC and the material hardness without treatment was 17.08 HRC. From the observation of the microstructure, the surface hardening occurs due to carbon diffusion into medium carbon steel
Desain Alat Pirolisis Reaktor Tunggal Untuk Daur Ulang Sampah Plastik Pah, Jack C.A.; Adoe, Dominggus Godlief Heryson; Fahik, Emanuel Don
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14282

Abstract

The purpose of this study was to determine the effect of media variations of 90% kusambi charcoal and 10% Plastic is a component that is difficult to separate from everyday human activities because of the various advantages it has. The more people consume, the more plastic waste they produce. To overcome this, of course, a way is needed to process the plastic waste into things that are more useful and also have benefits for nature, one way is by recycling the plastic waste into fuel, namely fuel in the form of oil. The benefit of this research is to produce fuel oil products from Polypropylene (PP) plastic waste as an alternative energy source by utilizing pyrolysis technology. Pyrolysis is a process for converting Polypropylene (PP) plastic waste into liquid fuel. The end result of this research is in the form of detailed images of the tool, the design of the tool, and the results of the testing process on the tool in the form of data on the quantity of oil in each test
Analisis Kegagalan pada daerah Sekitar Lubang Sambungan Baut pada Komposit Widuri akibat Pembebanan Tarik Pell, Yeremias M; Nahak, Wiiliam P.; Boimau, Kristomus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14283

Abstract

Serat widuri termasuk salah satu serat alam yang berpotensi untuk dikembangkan sebagai penguat pada komposit polimer. Pada penelitian kali ini, serat widuri kembali dijadikan penguat pada komposit polimer yang disambung dengan sambungan baut. Tujuan penelitian adalah untuk mengamati dan menganalisis kegagalan pada daerah sekitar lubang sambungan akibat pembebanan tarik yang diberikan pada spesimen. Adapun proses pembuatan komposit dilakukan dengan cara cetak tekan dan selanjurnya specimen dibentuk menurut standar ASTM Dari hasil penelitian dapat diketahui bahwa adanya lubang dapat meningkatkan konsentrasi tegangan yang menyebabkan degradasi kekuatan dan memicu kerusakan selama pengujian. Kerusakan seperti ini biasanya diawali dengan timbulnya retak awal karena matriks retak di sekitar lubang dan menjalar sepanjang luasannya. Dari foto makro kegagalan komposit dapat dilihat bahwa ada 2 jenis kegagalan yang terjadi yaitu net-tension atau tension failure dan juga tear out.
Analisis Kualitas Briket Berbahan Dasar Cangkang Kemiri fallo, Gideon; Riwu, Defmit B.N.; Koehuan, Verdy A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14285

Abstract

The increasing use of fossil fuels, which is aware of the issue of global warming and environmental damage due to pollution, has increased efforts to develop renewable energy sources. Briquettes are one of the alternative sources of renewable energy that have been developed this decade. This research is part of an effort to develop briquettes, especially hazelnut shell briquettes, as an alternative fuel. Making hazelnut shell charcoal briquettes is carried out by carbonization process using the pyrolysis method. Making starch adhesive (tapioca starch) with a ratio of charcoal powder and starch adhesive (tapioca flour) of 90:10%. Furthermore, the candlenut shell briquettes were tested for proximation tests (ash content, moisture content and calorific value). Candlenut shell briquettes can be used as an alternative fuel because they have a high calorific value of 6061kcal/kg. The hazelnut shell briquettes basically comply with the Indonesian National Standard SNI 01-6235-2000 and the Emission Standards of the Regulation of the State Minister for the Environment Number 05 of 2006 regarding the threshold for exhaust emissions of old motorized vehicles.
Pengaruh Variasi Tekanan dan Jumlah Lubang Injektor Terhadap Besar Sudut Semprotan Bahan Bakar Bioetanol Naitboho, Asriel; Riwu, Defmit B.N.; Dwinanto, Matheus M.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14287

Abstract

This research aims to determine the effect of variations in pressure and number of injector holes on the spraying angle of bioethanol fuel. Bioethanol fuel has become a promising alternative in reducing dependence on fossil fuels. However, proper spray characteristics are required to achieve efficient combustion and low emissions. In this research, experiments were carried out using injectors with varying numbers of holes, namely 6 holes and 12 holes and varying pressures, namely 30 Psi, 40 Psi and 50 Psi. The spray angle of bioethanol fuel is measured and analyzed using appropriate measuring equipment. The research results show that variations in pressure and number of injector holes have a significant influence on the spraying angle of bioethanol fuel. In this case, increasing the pressure tends to increase the spray angle, while increasing the number of holes tends to reduce the spray angle. This understanding is important in designing an efficient and optimal bioethanol fuel injection system. This research contributes to the development of bioethanol fuel technology and provides insight into the influence of pressure and the number of holes in the injector on spray characteristics
Variasi Parameter Proses Terhadap Pengujian Material Removal Rate dengan Mesin CNC Bubut pada Proses Finishing Baja SKD-11 Menggunakan RSM Saputra, Anggi; Kurniawan, Zaldy; Oktriadi, Yudi
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14735

Abstract

ABSTRAK Mesin CNC Turning dalam industri manufaktur berperan dalam menghasilkan komponen-komponen yang memerlukan ketelitian dan kompleksitas yang tinggi. Peralatan permesinan yang digunakan sangat berpengaruh untuk mengingatkan nilai proses produksi pada dunia manufaktur. SKD-11 mempunyai tingkat ketahanan aus yang tinggi, daktilitas yang baik, sehingga baik dan tepat untuk komponen yang memerlukan presisi dan daya tahan tinggi. Untuk mencapai optimasi dapat digunakan Response Surface Method (RSM) Box Behnken Design, dengan tiga varian yang dapat memperoleh nilai optimasi terbaik. Pada penelitian ini variabel gerak makan dan kedalaman nutrisi merupakan variabel yang signifikan atau mempengaruhi MRR. Dari hasil analisa diperoleh nilai optimasi untuk kecepatan potong 286,238 m/menit, gerak pemakanan 0,19751 mm/putaran, kedalaman pemakanan 0,12486 mm.
Pengaruh Variasi Putaran Motor Penggerak Terhadap Optimalisasi Kerja Pada Alat Shaking Table Sore, Agustinus Seven; Jasron, Jahirwan Ut; Pah, Jack C.A.; Sanusi, Arifin
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14831

Abstract

Indonesia is a country rich in minerals (mining), and iron sand is a source of magnetic material. The tool usually used in iron sand processing is the Shaking Table, a vibrating sieve mechanism that is generated by the force in the rotation of the driving motor for minerals such as metal and sand. This research aims to determine the rotation of the driving motor to obtain good material sieving results. From the test results of 3 kg of iron sand material, the best results were obtained at a rotation of 28.4 Rpm with the result of sieving material in the concentrate category as much as 0.55 kg and in the tailings category as much as 2.45 kg. The greater the pulley ratio, the slower the rotation that occurs on the wheel piston. On the other hand, the smaller the diameter of the pulley, the faster the piston wheel rotates to move the deck-shaking table. This occurs in accordance with the concept of moment of force, the pulley and axle are concentric wheels.
Simulasi Kinerja Termodinamika Refrigerator Dengan Injeksi Cairan Menggunakan R515A Dan R515B Amalo, Alexander C.; Gurnawati, Gurnawati; Dwinanto, Matheus Magnus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14914

Abstract

This research aims to analyze and compare the thermodynamic performance of refrigerators using two types of refrigerants, namely R515A and R515B, with liquid injection techniques. Refrigerators are important devices in a variety of applications, including the food, pharmaceutical, and household refrigeration industries. This simulation includes important variables such as pressure, temperature, mass flow, and thermophysical properties of both refrigerants. In addition, it also considers fluid injection technique variables such as injection amount, injection time, and injected fluid properties. The research results show a performance comparison between R515A and R515B in terms of thermal efficiency, cooling capacity, and power consumption. It was found that the use of R515B with certain liquid injection resulted in a significant increase in the overall efficiency of the refrigerator system. The results show that proper setting of the injection amount and injection time can optimize the performance of the refrigerator system. Selecting the right refrigerant and liquid injection strategy can produce a more efficient system. This research provides in-depth insight into the thermodynamic aspects of refrigerator systems and illustrates the importance of refrigerant selection and operational techniques in achieving maximum efficiency.
Simulasi Kinerja Thermodinamika AC Split Menggunakan Refrigeran R32, R1234yf, dan R290 Lamawuran, Marianus Adventus; Gurnawati, Gurnawati; Dwinanto, Matheus Magnus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14937

Abstract

Split AC is the process of regulating temperature, humidity, cleanliness, and air distribution in a room so as to achieve thermal comfort conditions for the occupants in it. The purpose of this research is to simulate the thermodynamics of a Split AC using environmentally friendly refrigerants R32, R1234YF, and R290 using Genetron Propertis software version 1.4.1. The method used in this study is a standard air conditioning performance simulation using R32, R1234YF, and R290 refrigerants with Genetron Propertis software version 1.4.1. The simulation results of the basic cycle refrigeration system performance with the working fluid R32 for the condensation temperature are maintained constant, because the temperature of the refrigerant gas through the condenser must be higher than the ambient temperature, condensation occurs in the condenser, so that the refrigerant changes form to liquid. From the simulation of the split AC thermodynamic performance, an increase in the evaporation temperature will have a significant impact on increasing the consumption of pumping power, increasing the mass ratio, and COP in the system.
Analisis Pengaruh Variasi Tekanan Pada Briket Cangkang Kemiri Terhadap Temperatur, Laju Pembakaran Dan Kadar Abu Tonda, Naptalia; Jasron, Jahirwan Ut; Pell, Yeremias M.; Mangesa, Daud P.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14971

Abstract

In the process of making briquettes, there are still obstacles, namely, the printing process still uses traditional methods, and the existing briquette printing equipment is also not equipped with a hydraulic system and pressure gauge, so it requires more printing time. It cannot know how much pressure is applied during printing. A briquette printing machine equipped with a hydraulic system and pressure gauge is needed to simplify the briquette printing process and save energy. The aim of designing this briquette printing machine is to produce a press machine design with a hydraulic system equipped with a pressure gauge. The design method used in this research is the Shigley-Mitchell method. This briquette press has a length of 350 mm, a width of 450 mm, and a height of 840 mm. The mold cylinder has 16 mold cylinders. In one printing cylinder, it can produce briquettes weighing 52 grams with a height of 80 mm, so in one printing, this tool, with a printing time of 6.5 minutes, can produce 0.832 kg briquettes. The capacity of this briquette press per hour is 148 briquettes/hour.

Page 17 of 22 | Total Record : 216

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