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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 200 Documents
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Rancang bangun Generator Asitilin Untuk Pengelasan Pelat Body Kendaraan Dominggus G. H. Adoe; Rima Nindia Selan
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 4 No 1 (2017): April 2017
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.461 KB)

Abstract

Oxyacetylene Generator available in commercially has a price which is more expensive and has a complicated construction workings. Therefore it is necessary Oxyacetylene generator with a more simple construction made of materials that are easily obtainable and has a good safety factor and easy to operate. Oxyacetylene gas formation process which is not proportional to the strength of the materials used can result in damage of occurrence, because it needs to be calculated strength of the construction of the generator Oxyacetylene. This research used steel pipe with a diameter of 141.322 mm and a thickness of 9.7 mm and an overall length of 1510 mm. The maximum gas pressure that occurs Oxyacetylene 20.25 with the average voltage in the Oxyacetylene generator amounted to 60.65 N / m2. Test results indicate that the generator design asitelin result has been able to work well. From the test data showed that the length of the door frame welding Oxyacetylene generator is 93.31, while the welding length is 360 mm designed it can be said safely against the forces acting due to the pressure and stress that occurs in the Oxyacetylene generator still under stress and pressure of the material permits. With a force that will decide the generator cover amounting to 317,380.39 N Oxyacetylene declared safe to welding because σi = 125 N / mm2 greater than τ = 101.79 N / mm2. While the force will decide on the lintel of 317,380.39 N Oxyacetylene generator is declared safe to welding because σi = 125 N / mm2 greater than τ = 124.6 N / mm2.
Pengaruh Waktu Pemanasan Menggunakan Pemanas Induksi Terhadap Kekerasan dan Struktur Mikro Material S50C Viktor Naubnome; Eri Widianto; Marno Marno
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 4 No 1 (2017): April 2017
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Fabrication of inducting heating system for heating treatment in S50C materials have been done. This inducting heating system has dimensions of 350x230x200 mm, the input voltage of 12 VDC, equipped with a timer control and ampere meter as an indicator of output current. Inducting heating system testing on the material S50C was done by varying tempering process (30, 60, 90, 120 and 150 s). Hardness and microstructure test using Auto Vikers Future Tech type FV-300. The results showed that the hardness increased with increasing tempering time from 191 Hv to 572 Hv. S50C materials microstructure was transformed from ferrite and pearlite phase into martensite phase.
Simulasi Karakteristik Proses Pembakaran pada Motor Bensin 3000 cc Rosid Rosid; Viktor Naubnome
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 4 No 1 (2017): April 2017
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Research conducted through the development of a simulation model of the combustion process in the combustion parameters using 3000 cc petrol engine with combustion models correspond to the experimental approach. The purpose of the study by simulations that include combustion and emissions formation in the combustion chamber. The simulation was performed by varying the rotation of 1000 rpm, 1500 rpm, 2500 rpm, 3500 rpm and 4500 rpm, to determine the most optimal working areas at 3000 cc petrol engine. The simulation results show the most optimal working range at 3500 rpm combustion, the fuel starts burning at a pressure of 2318.40 kPa at temperatures of 722.25 K and a crank angle of 716 degrees. The lowest peak pressure 2643.00 kPa at 748.75 crank angle degrees, the highest peak pressure of 4097.80 kPa at 742.25 crank angle degrees. Lowest peak temperature 1954.73 776.50 K at the crank angle degrees, the highest peak temperature 2173.51 755.75 K at the crank angle degrees. Changes of the lower peak pressure to the highest peak pressure ranges from 64.5%, while the lowest peak temperature change to the highest peak temperature ranges from 89.9%.
Pengaruh Penambahan Senyawa Acetone Pada Bahan Bakar Bensin Terhadap Emisi Gas Buang Defmit B. N. Riwu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 4 No 1 (2017): April 2017
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (207.769 KB)

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh penambahan senyawa Acetone pada bahan bakar bensin terhadap emisi gas buang motor 1 silinder 4 langkah dengan volume ruang bakar 100 cc. Pengujian dilakukan dengan menambahkan Acetone sebanyak 1 ml, 2 ml dan 3 ml kedalam bahan bakar bensin sebanyak 1000 ml. Dari hasil pengujian, didapati bahwa dengan penambahan tiap 1 ml senyawa Acetonepada 1000 ml bensin, maka besar prosentase kandungan gas CO yang terbentuk semakin berkurangatau mengalami penurunan. Selain itu kadar HC yang terukur juga berkurang atau dengan kata lain proses pembakaran menjadi lebih baik. Hidrokarbon (HC) yang terukur dalam emisi gas buang menunjukan senyawa bahan bakar yang tidak habis terbakar dalam proses pembakaran.
Simulasi CFD Performa Aerodinamika Rotor Turbin Angin Counter-Rotating melalui Variasi Rasio Kecepatan Tip Blade dengan Solidity Konstan Verdy A. Koehuan; Jani F. Mandala
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
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.v9i02.3342

Abstract

The aim of this research is to numerically study the aerodynamic parameters of the rotor, namely the tip speed ratio, stall phenomenon, and flow losses due to the vortex along the turbine rotor blade. Numerical analysis through the CFD or computational fluid dynamics simulation method is applied to counter-rotating wind turbines to predict and analyze the aerodynamic performance of the rotor through variations in the diameter ratio, distance ratio to tip speed ratio on constant rotor solidity. The performance of this turbine rotor is represented as the output power and the power coefficient of each research variable to obtain the best performance as well as the turbine rotor design as the research output. CFD prediction results show a trend that is closer to the experiment, where the maximum power coefficient value occurs at TSR = 6 with CP, max = 0.453 which is 3.09% lower than the experimental results. This shows that the CFD simulation model is validated in almost all of the varied TSR ranges, except at high TSR it tends to move away from the experiment. Flow fluctuation after passing through the second rotor is caused by the vortices in the hub and blade tips of the front and rear rotors. Rotors with misaligned blade tips (D1/D2 <1.0 and D1/D2 > 1.0) are more volatile than rotors with aligned tip blade (D1/D2 = 1.0).
Rancang Bangun Mesin Pemeras Santan Kelapa Dengan Mekanisme Tekan Horizontal Daud P. Mangesa; Defmit B.N. Riwu; Muhammad Julfikar
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
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.v9i02.3343

Abstract

Mesin pemeras santan kelapa merupakan sebuah mesin yang digunakan untuk memeras santan kelapa yang terdapat pada parutan kelapa. Mesin ini tersusun atas motor listrik sebagai penggerak yang dilengkapi dengan dimmer AC yang bertujuan untuk mengurangi kecepatan putaran dari motor. Kemudian putaran tersebut ditransmisikan oleh bearing, pulley, belt, yang kemudian akan menggerakkan poros ulir (screw press). Berdasarkan perhitungan dalam perencanaan, mesin pemeras santan kelapa ini didapatkan diameter poros yang digunakan adalah 24,5 mm, dan diameter ulir pada poros (secrew press) adalah 70 mm dengan daya motor listrik 1 HP. Berdasarkan penelitian, diperlukan putaran rendah untuk memeras santan kelapa hal ini dimaksudkan agar perasan tersebut lebih optimal. Pemerasan santan kelapa dilakukan cukup 1 kali karena kandungan santan dalam parutan kelapa sudah terperas seluruhnnya. Dengan sistem ini dapat mempercepat proses produksi serta lebih efisien dari segi ekonomi
Analisis Pengaruh Temperatur Dan Perlakuan Korosi Terhadap Ketahanan Putus Tabung Silinder Asetilin Bermaterial Drum Besi Bekas (Baja AISI 1045) Dominggus G. H. Adoe; Wenseslaus Bunganaen; Bahrun K. A. Mandala
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
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.v9i02.3344

Abstract

corrosion rate of cylinder tube materials. The temperature variations determined by the specimen were 200ºC, 250ºC and 300ºC. The specimens were subjected to corrosion treatment with Calcium Carbide (Carbide) corrosion media, then tested. The results showed that the lowest corrosion rate was the treatment specimen, namely 48.57142 mg/cm2 day, while the specimen with the highest rate was the specimen with the provisions of 70.47619 mg/cm2 day. For the tensile test, the highest value of fracture tensile stress (σp) was the untreated specimen of 243.35 MPa, while the lowest value of fracture stress (σp) was the specimen with a temperature of 300oC of 156,786 Mpa, the highest value of fracture tensile strain (ɛp) was the specimen with 300oC of 0.166875%, while the lowest value of fracture tensile strain (ɛp) is the specimen with the provision of 250 °C of 0.12025%, the highest modulus of elasticity is the specimen with the 200oC requirement of 1569.2026 MPa, while the lowest modulus of elasticity is the specimen with 300 °C of 939.5415 MPa
Studi Eksperimental Skala Laboratorium Rumah Pengering Kopi Menggunakan Plastik Ultra Violet (UV Solar Dryer) Dengan Mekanisme Konveksi Paksa Riky Yonerto Runesi; Verdy A. Koehuan; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
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.v9i02.3345

Abstract

The utilization of solar radiation in the greenhouse effect dryer (ERK) is an alternative to overcome the drying process constraints. The drying process in direct sunlight, which is common in the community, has drawbacks, such as low capacity and takes a long time, and the risk of contamination and disturbance from animals during the drying process. Meanwhile, the quality criteria for coffee beans include physical aspects, taste, and cleanliness as well as uniform and consistent aspects which are largely determined by the treatment at each stage of the production process. The drying process uses ultraviolet plastic (UV solar dryer) to absorb solar radiation and the heat is trapped, then it is used for the drying process of the material. The problem studied is how the performance of the coffee bean drying house through experimental studies using ultraviolet plastic (UV solar dryer) using the forced convection mechanism. The purpose of this study was to determine the efficiency of the coffee bean drying house and the drying rate on the speed of the outflow of air through the exhaust fan. Drying time starts from 11.00 to 15.00 with a total initial coffee weight of 53.37 kg (drying capacity 7.76 kg/m2) and an initial moisture content of 45.5%. From the experimental results, the temperature distribution in the dryer house with an increase in the outflow velocity through the exhaust fan, the air temperature distribution in the dryer house tends to be uniform. However, the variation in flow rate shows the highest coffee bean drying rate at an exit speed of 1.0 m/s, with an efficiency of 9.68% and specific energy consumption of 32799.64 kJ/kg
Studi Eksperimental Rumah Pengering Kopi Menggunakan Plastik Ultra Violet (Uv Solar Dryer) Dengan Mekanisme Konveksi Alamiah Sam Budi; Verdy A. Koehuan; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
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.v9i02.3346

Abstract

Ultraviolet solar dryer atau biasa disebut juga metode pengeringan dengan menggunakan efek rumah kaca (ERK) merupakan metode pengeringan yang memanfaatkan energi surya sebagai sumber energi utama. Radiasi dari sinar matahari diserap langsung oleh plastik UV yang berfungsi sebagai penghantar dan penahan panas sehingga temperatur didalam suatu tempat atau ruangan yang ditutupi oleh plastik UV ini tetap terjaga. Studi eksperimental rumah pengering kopi menggunakan plastik ultra violet (uv solar dryer) dengan mekanisme konveksi alamiah ini dilakukan dengan menggunakan metode eksperimen. Tujuan untuk mengetahui waktu pengeringan biji kopi terhadap distribusi temperatur ruangan rumah pengering dengan mekanisme konveksi alamiah. Hasil pengujian menunjukkan pengaruh waktu pengeringan biji kopi terhadap distribusi temperatur di dalam ruangan rumah pengering dengan mekanisme konveksi alamiah. Pengaruh waktu pengeringan terhadap distribusi temperatur ruangan rumah pengering terlihat sedikit fluktuatif. Namun rata-rata temperatur ruangan dari beberapa titik pengukuran relatif seragam dengan nilai lebih tinggi dari lingkungan. Nilai kadar air basis basah 3,17 %, basis kering 3,07 % dan rata – rata kadar air akhir biji kopi 20,45%, laju pengeringan 0,77 %bb/jam, dan efisiensi rumah pengering 4,84 %.
Analisis Tinggi dan Temperatur Api pada Pembakaran Premixed Campuran Minyak Solar Murni dan Fame (Fatty Acid Methyl Ester) Defmit B.N. Riwu; Jack C. A. Pah; Adi Y. Tobe; Wagimin Wagimin
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 01 (2020): April 2020
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.v7i01.3378

Abstract

Penelitian ini dilakukan dengan membakar campuran minyak solar murni dan minyak FAME (Fatty Acid Methyl Ester) dengan prosentase campuran solar murni (80%, 90%, dan 95%) dan minyak FAME (20%, 10%, dan 5%) secara premixed. Berdasarkan hasil penelitian didapatkan bahwa semakin besar prosentase minyak FAME yang ditambahkan maka tinggi api dan temperatur api menurun, meski penurunannya tidak terlalu signifikan. Pada prosentase minyak solar murni dan FAME (Solar 95% - FAME 5%) Pada debit udara 350 ml/min dengan equivalence ratio 1.571 pada prosentase minyak solar 95% - FAME 5%, 1.535 pada prosentase minyak solar 90% - FAME 10% dan 1.462 pada prosentase minyak solar 80% - FAME 20%. Hubungan prosentase minyak solar dan FAME terhadap temperatur pada dua titik pengambilan temperatur yaitu bagian ujung api dan bagian tengah dekat ujung burner. Terlihat bahwa semakin besar prosentase minyak FAME maka semakin kecil temperatur apinya.

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