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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 231 Documents
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Pemanfaatan Arang, Dolomite Dan Aerasi Dalam Destilasi Air pH Rendah Berbasis Energi Surya Untuk Meningkatkan Kualitas Air Yohanes Firmansianus Mulyadi; Ben V Tarigan; Jahirwan Ut Jasron
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.19416

Abstract

Research has been conducted on the effect of the addition of charcoal, dolomite lime and aeration process on changes in water pH with a passive solar distillation system. The results showed that in the basin with the treatment of charcoal alone the results of pH changes were as follows: 7.3 on the first day, 7.2 on the second day and 7.1 on the third day. for basins with dolomite lime the results of changes in the final pH of the water are as follows: 7.5 on the first day, 7 on the second day and 7.3 on the third day. In basins with aeration process treatment, the results of changes in the final pH of the water are as follows: 7.6 on the first day, 6.9 on the second day and 7 on the third day. While the results of the final pH change for basins with a combination of both treatments are as follows: 7.7 on the first day, 7.2 on the second day and 7.3 on the third day.
Studi Eksperimen Sistem Pengendali Kelembaban Otomatis Pada Lemari Pengering Kopra Putih Barlyano Pah; Ishak S. Limbong; Verdy A. Koehuan
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.20075

Abstract

Indonesia adalah produsen kopra terbesar kedua di dunia, termasuk di Provinsi Nusa Tenggara Timur yang memiliki potensi besar dalam industri kopra. Namun, proses pengeringan tradisional yang masih umum digunakan, seperti pengeringan matahari atau tungku pemanas, sering kali menghasilkan kopra dengan kadar air tinggi dan meningkatkan risiko pertumbuhan mikroba serta jamur. Untuk mengatasi masalah ini, diperlukan sistem kelembaban otomatis yang mampu menjaga kelembaban optimal di dalam lemari pengering agar kopra dapat dikeringkan dengan lebih efisien dan berkualitas tinggi. Penelitian ini bertujuan mengimplementasikan sistem otomatis pada lemari pengering kopra putih, di mana fan akan aktif secara otomatis saat kelembaban di atas 35% dan mati ketika kelembaban berada di bawah ambang tersebut. Dalam eksperimen, sistem berhasil mengeringkan 6,8 kg kopra putih dari kadar air awal 46,9% menjadi 3,10% dalam 4 hari, sesuai dengan standar SNI 01-3946-1995. Hari pertama menunjukkan laju pengeringan tertinggi sebesar 5,291 gram/menit, sedangkan pada hari kedua, laju pengeringan stabil antara 3,723–2,702 gram/menit. Hari ketiga dan keempat mencatat penurunan laju pengeringan masing-masing 1,504 gram/menit dan 0,537 gram/menit, mencerminkan efek penurunan kelembaban material. Hasil ini menunjukkan bahwa kelembaban udara berpengaruh signifikan terhadap durasi pengeringan, di mana kelembaban tinggi memperpanjang waktu, sementara kelembaban rendah mempercepat proses pengeringan.
Rancang Bangun Mesin Penghancur Arang Biomassa Sebagai Bahan Baku Briket Dengan Penggerak Motor Bensin Arlindo Samuel Mata; Jahirwan Ut Jasron; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.20173

Abstract

The community that utilizes biomass energy as an alternative material (briquettes) still manually uses wood or other hard objects as a crushing medium, but produces coarse and non-uniform charcoal granules which have an impact on the quality of the charcoal briquettes produced. The purpose of making this tool is to solve the problems in the briquette making process, by utilizing the rotation of a gasoline engine as a driver, this tool is also equipped with a sieve with the aim of obtaining uniform biomass charcoal results. The results of the study showed that within 55 seconds with a motor rotation of 1,440 Rpm as much as 1 kg of charcoal material can be crushed and get results as much as 0.9 kg of uniform biomass charcoal according to needs.
Analisis Pengaruh Endplate Terhadap Kinerja Turbin Angin Savonius Sebagai Pembangkit Energi Listrik Moh Yusril Nurtaufiq; Arifin Sanusi; Yeremias M Pell
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22084

Abstract

If without using an end plate, the wind direction is more spread out. From the main background of end plate testing, a study was conducted entitled "The Effect of End Plates on the Performance of Savonius Wind Turbines as Electric Power Generators". The test results show that with the same wind speed, it can produce greater turbine rotation if using an endplate compared to without using an endplate, from the results of the study at the same wind speed of 6.1 m / s it produces a rotor rotation of 652.5 rpm, Tip Speed ​​Ratio 0.8, power coefficient 0.5. In the turbine using endplate, this result is greater than the turbine without endplate by 488.9 rpm, Tip Speed ​​Ratio 0.4, power coefficient 0.2. The efficiency of the generator using endplate is better than without using endplate. Namely the maximum efficiency produced is 13.76% at a wind speed of 3.8 m/s. While without using endplate the maximum efficiency produced is 7.06% at a wind speed of 3.5 m/s.
Analisis Total Productive Maintenance (TPM) Dengan Menggunakan Metode OEE Pada Mesin Blowing Nuriyanto Nuriyanto; Mochammad Rizal Ardiansyah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22090

Abstract

Penelitian ini bertujuan untuk menganalisis efektivitas mesin blower di PT ABC dengan menerapkan Total Productive Maintenance (TPM) menggunakan metode Overall Equipment Effectiveness (OEE). Mesin blower mengalami downtime tertinggi sebesar 3,54% sehingga mempengaruhi tercapainya target produksi. Pengukuran OEE melibatkan tiga parameter utama yaitu ketersediaan, tingkat kinerja, dan tingkat kualitas. Hasil penelitian menunjukkan nilai OEE rata-rata sebesar 76,61% yang masih berada di bawah standar ideal kelas dunia yaitu 85%. Faktor utama yang menyebabkan rendahnya OEE adalah performance rate. Selanjutnya dilakukan analisis kerugian produksi dengan pendekatan Six Big Losses, dengan kerugian terbesar diidentifikasi sebagai pengurangan kecepatan loss dan idling & minor stoppages. Analisis akar penyebab dilakukan dengan menggunakan diagram fishbone dan analisis 5 Whys. Rekomendasi perbaikan dirumuskan untuk meningkatkan kinerja mesin dan meningkatkan produktivitas secara keseluruhan.
Penerapan Strategi Perawatan Reliability Centered Maintenance (RCM) Pada Electric Motor Pompa Sentrifugal Jenis Multistage Perusahaan Minyak Anissa Shifa Azahra; Mansyaul Huda; Mario Agung Halomoan Pakpahan; Muhammad Faiz Ramadhan; Fajar Paundra
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22261

Abstract

In this practical work activity, the author conducted an FMEA (Failure Mode and Effect Analysis) analysis on a medium voltage electric motor (4160 V) used in a multistage centrifugal pump in oil company industry. The analysis was conducted to identify failure modes, causes, impacts, and determine severity, occurrence, and detection values which were then used to calculate the Risk Priority Number (RPN). Based on the results of the analysis, it was found that the winding component has the highest RPN value, followed by the shaft and grounding cable, so it requires priority in handling. The maintenance strategies applied include Preventive Maintenance (PM), Predictive Maintenance (PDM), and Corrective Maintenance (CM), with maintenance intervals adjusted for each component. Through this analysis, maintenance recommendations can be determined to reduce the risk of damage and maintain the continuity of tool operations, while providing practical experience in the application of Reliability Centered Maintenance (RCM) strategies in oil company industry.
Perawatan Preventif pada Kapal Penumpang RAIHAN NISFU ROMADHON; Muhammad Qeis; Jalu Kanaka; Lutfi Taufiqul Hakim; Fajar Paundra
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22325

Abstract

Marine transportation company with a focus on the safety and maintenance systems of passenger ships, there are stages of maintenance and care on the ships themselves from various light to heavy parts such as lubrication, coating to corrosion on the ship. The objective of this internship is to analyze the implementation of safety systems and maintenance procedures on the passenger fleet, as well as to assess the effectiveness of the maintenance practices in ensuring the quality and safety of the vessels. The methodology used in this research includes direct observation of the safety and maintenance procedures implemented on-site, interviews with technicians and staff involved in ship maintenance, and literature studies referring to international standards and applicable regulations. The findings indicate that the company has implemented adequate safety procedures, such as the use of lifeboats that meet IMO standards, and carries out routine maintenance on the ships. However, there are several areas that can be improved, particularly in terms of preventive maintenance execution and corrosion management on the vessels. Based on these findings, it is recommended that the company increase the frequency of anti-corrosion coating on parts of the ships that are vulnerable to damage due to exposure to seawater.
Perancangan Mesin Pemecah Kulit Kemiri Ahmad Al Buchari A
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22386

Abstract

The purpose of this study is to design and test a candlenut shelling machine to facilitate agricultural product entrepreneurs in the production process. The method used is the analysis method by calculating torque and power and using Autodesk software to draw tool designs, design tools, test tools, design tools using materials such as angle iron, 5 hp 2800 rpm DC electric motors, pulleys, v-belts and drive shafts. The results of this machine test use the principle of striking force on iron connected to an electric machine (DC) using a shaft and pulley and the breaking process takes an average of 1 minute for 4 tool trials. Then the percentage of the results of breaking the candlenut shells reaches 75-80% round candlenuts and 20-25% broken candlenuts. After the breaking process is complete, the candlenut core and skin are separated manually. In conclusion, the design of this candlenut shelling machine can be used properly after going through several trials. Keywords: Design, Breaking Machine, Autodesk, Throwing System.
Analisis Kinerja Turbin Savonius Dengan Variasi Sudut Pengarah Aliran Air Pada Saluran Terbuka Bernabas Rivaldo Allung; Arifin Sanusi; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22490

Abstract

Indonesia has significant potential for hydropower development due to its mountainous and hilly topography, numerous rivers, and lakes/reservoirs that can be utilized as water energy sources. Water energy is harnessed for power generation using water turbines. One type of water turbine that can be used is a turbine with vertical or horizontal axis rotation, which can convert fluid energy into mechanical energy without requiring high head like other types of water turbines. One challenge is how to utilize the potential of relatively small water flow energy. Therefore, research is needed to transform constant water flow velocity to drive turbine or wheel shafts. The results show that the use of flow guide vanes on Savonius-type water turbines significantly affects turbine performance, with an average power coefficient increase of 5.80%. Additionally, the highest average power output of 3206.86% was obtained at a 45° deflector angle, which is higher compared to other angles such as 0°, 15°, 30°, and 60°.
Pengaruh Perlakuan Alkali Terhadap Wettability Serat Ijuk Aren (Arenga Pinata) Sefriano Muti Seran; Dominggus G. H. Adoe; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22798

Abstract

This study aims to analyze the effect of alkali treatment (NaOH) with variations in concentration (0%, 2%, 3%, 4%, dan 5%,) and soaking time 30, 60, 90, and 120 minutes on the wettability of palm fiber. Wettability measurements were carried out by observing the diameter of water droplets on the fiber surface. The results showed that the concentration of NaOH and soaking time had a significant effect on changes in droplet diameter. At a concentration of 0 without treatment, the droplet diameter reached 81.20 µm. At a concentration of 2%, the droplet diameter decreased to 40.01 µm 30 minutes, 38.84 µm 60 minutes, 42.57 µm 90 minutes, and 43.20 µm 120 minutes. The 3% concentration showed an inconsistent pattern with droplet diameters of 28.66 µm 30 min, 78.11 µm 60 min, 28.50 µm 90 min, and 66.21 µm 120 min. At a concentration of 4%, the droplet diameters varied between 41.37 µm and 74.61 µm. A concentration of 5% produced droplet diameters of 41.24 µm 30 min, 61.32 µm 60 min, 44.42 µm 90 min, and 60.65 µm 120 min. This study provides important insights into the optimization of alkali treatment for the application of palm fiber in composite materials.

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