LONTAR Jurnal Teknik Mesin Undana

Pemanfaatan Arang, Dolomite Dan Aerasi Dalam Destilasi Air pH Rendah Berbasis Energi Surya Untuk Meningkatkan Kualitas Air

Yohanes Firmansianus Mulyadi — 2026-04-30

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.

Rancang Bangun Alat Pengasap Ikan Se’i dengan Sistem Vertikal dan Horizontal

Aristo Sixtus Gonsani — 2026-04-30

The growth of the fisheries subsector plays an important role as a contributor to the means of production in various regions of Indonesia, but not all regions of Indonesia can meet their needs from existing technological developments due to the uneven distribution of fish, so appropriate processing is needed for fish distribution in Indonesia. The process of smoking fish in Indonesia was originally carried out traditionally using simple equipment and paying less attention to sanitary and hygienic aspects so that it can have an impact on health and the environment. Based on this, a more hygienic and environmentally friendly fish smoking device will be designed and realized, where the smoking process is lighter and the level of cleanliness is better and sterile from the outside environment. Analysis results for 200 kg loading pressure on the frame 3.117 x 106 N/m², on the shelf 1.901 106 N/m². The se'i fish smoker using vertical and horizontal systems is 100 cm long, 100 cm wide, and 186 cm high. The smoking rack is 22 cm high, 99 cm wide, and 73.5 cm long. The smoking kitchen is 43 cm high, 64 m wide, and 99 cm long

Total Productive Maintenance (TPM) Analysis Using the OEE Method on Blowing Machines

Nuriyanto Nuriyanto — 2026-04-30

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.

Perancangan Sistem Pembangkit Listrik Tenaga Surya untuk Konversi Energi Termal pada Baterai Pasir

Theodorus Mara Dosi — 2026-04-30

Penelitian ini berjudul "Perancangan Sistem Pembangkit Listrik Tenaga Surya Untuk Konversi Energi Termal Pada Baterai Pasir.” Latar belakang penelitian ini adalah Kebutuhan energi terbarukan merupakan usaha untuk mengatasi penggunaan energi yang begitu banyak dan terus meningkat. Kebutuhana akan energi diperlukan pengembangan energi khususnya energi terbarukan. Indonesia memiliki potensi energi baru terbarukan yang berlimpah mencapai 3.687 GW dan salah satu sumber energi terbarukan paling besar yang ramah lingkungan adalah energi surya dengan potensi energinya mencapai 3.294 GW. Penyimpanan energi termal (TES) merupakan sebuah teknologi yang menyimpan energi panas dengan media penyimpanan, sehingga energi yang tersimpan dapat digunakan, baik untuk aplikasi pemanasan dan pendinginan atau untuk pembangkit listrik.

Analisis Kinerja Turbin Savonius Dengan Variasi Sudut Pengarah Aliran Air Pada Saluran Terbuka

Bernabas Rivaldo Allung — 2026-04-30

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°.

Studi Eksperimen Sistem Pengendali Kelembaban Otomatis Pada Lemari Pengering Kopra Putih

Barlyano Pah — 2026-04-30

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.

Pengaruh Perlakuan Karburising Menggunakan Arang Kayu Kusambi Terhadap Kekerasan Material Pada Spesimen Tooth Bucket Excavator

Mohammad Fadel — 2026-04-30

The aim of this research is to determine the effect of carburizing using kusambi charcoal on the hardness of Excavator Bucket Tooth. An excavator is a piece of heavy equipment that is often used in various types of projects to carry out various projects such as loading and unloading asphalt, digging soil and is also used in the mining world for digging. This research was conducted at the Kupang State Polytechnic campus from May to June 2024, using tools such as a furnace, electric grinder, microscope, hardness testing equipment, 60 mesh sieve, carburizing box and the materials used were an excavator tooth bucket and kusambi charcoal powder. . This research uses 2 tests, namely Vickers hardness testing and microstructure testing. In the Vickers hardness test, the average hardness value for each media variation was the best with a hardness treatment of 130 grams with an average hardness value of 36 VHN. Meanwhile, in the microstructure test with 130 grams of pearlite treatment, the pearlite structure increased and the grain size began to even out along the penetration, although there was still a lot of ferrite on the pearlite side.

Penerapan Strategi Perawatan Reliability Centered Maintenance (RCM) Pada Electric Motor Pompa Sentrifugal Jenis Multistage Perusahaan Minyak

Anissa Shifa Azahra — 2026-04-30

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 — 2026-04-30

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 — 2026-04-30

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.

Pengaruh Perlakuan Alkali Terhadap Wettability Serat Ijuk Aren (Arenga Pinata)

Sefriano Muti Seran — 2026-04-30

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.

Rancang Bangun Mesin Penghancur Arang Biomassa Sebagai Bahan Baku Briket Dengan Penggerak Motor Bensin

Arlindo Samuel Mata — 2026-04-30

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 — 2026-04-30

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.

Bangun dan Pengujian Alat Pencetak Briket Silinder dan Kubus Berlubang Tengah Menggunakan Variasi Putaran

Jason Yuniando Willa Here — 2026-04-30

The global energy crisis is driving the need for environmentally friendly alternative energy, one of which is biomass briquettes from coconut shells, rice husks and sawdust. This research designs and tests a biomass briquette printer based on an electric motor with variations in rotation to produce cylindrical and cube-shaped briquettes with a center hole. The tool design was created using SolidWorks, accompanied by stress, displacement and strain simulations, as well as testing at the Mechanical Engineering Laboratory, Nusa Cendana University, Kupang, NTT. The results show a maximum stress of 5.006 × 10⁴ MPa and a maximum displacement of 2.165 × 10⁻⁴ mm, proving the tool is quite strong. 17.3 rpm rotation produces 19 complete briquettes, showing the best efficiency compared to other variations. This tool is effective for supporting sustainable alternative energy production.

Pengaruh Perlakuan Alkali Terhadap Kekuatan Tarik Serat Buah Lontar

Supryadi Umbu Mila Meha — 2026-04-30

Along with the rapid development of technology, it has encouraged the
discovery of several alternative technologies as a way to meet the needs of the
community. Especially in material materials, the materials needed are quality
materials and have high mechanical properties. Certain chemical treatments need
to be carried out on natural fibers to improve the compatibility of natural fibers as
reinforcements in composites. Chemical modification directly affects the fiber
structure and changes the chemical composition of the fiber, reducing the tendency
for moisture absorption by the fiber, so that it will provide a better bond between
the fiber and the matrix, this will produce better mechanical and thermal properties
of the composite. The results showed that the concentration of alkali solution
(NaOH and KOH) affected the tensile strength of lontar fiber. 5% NaOH treatment
produced the highest tensile strength of 606.567 MPa, while 10% KOH was
587.292 MPa. Fibers treated with seawater had the lowest tensile strength of 146
MPa. SEM results showed that the surface of the fiber treated with alkali was
cleaner.