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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 231 Documents
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Studi Eksperimen Matriks Dan Fiber Komposit Sebagai Material Bodi Remote Control Boat Andik Budiono; Ira Kusumaningrum; Mualifi Usman
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.24675

Abstract

This research aims to evaluate the performance of composite materials made from woven cloth, fiberglass and banana fronds in making Remote Control Boat bodies. As the need for fast ships and performance efficiency increases, selecting light and tough materials becomes the main key in ship hull design. The research was carried out experimentally with a toughness testing method (impact test) using the ASTM D256 standard. The independent variables used include fiber type (woven cloth, fiberglass, and banana fronds), resin type (epoxy and polyester) with a 3×2×3 factorial design and three repetitions. It is hoped that this research can contribute to the development of alternative materials in the small-scale shipping industry and become a reference in the use of natural fibers as composite reinforcing materials.
Analisa Hidrolis Sistem Irigasi Pertanian Jonri Lomi Ga; Alexius Leonardo Johanis; Jody Alfred Zacharias; Sulche Ifone Nafi; Ferdinand Nikson Liem; Almido Haryanto Ginting
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.25167

Abstract

The objective of research is to assess the uniformity of pressure and the effectiveness of water distribution among the irrigation nodes. The study models drip and sprinkler irrigation networks in an 11,500 m² agricultural field using a hydraulic modeling technique using EPANET 2.2 software. The number of non-flow nodes in each simulated area, the minimum-maximum discharge, and the average pressure are the primary parameters that are examined. The findings demonstrate that branch diameter, pipe length, and pipe network layout all have a substantial impact on flow rate and pressure distribution. While locations with longer pipe segments encounter pressure drops of up to 5–7 mH₂O at the downstream portion, areas with homogeneous pressure (8–10 mH₂O) demonstrate more steady and effective water distribution performance. It was discovered that the main causes of system efficiency reduction were frictional energy losses and small losses. To increase pressure uniformity, pump energy efficiency, and overall irrigation system reliability, technical suggestions are made to install pressure regulator valves (PRV), optimize pipe diameter, and conduct zoning operations.
Analisis Kualitas Bahan Bakar Marine Fuel Oil (MFO) Hasil Separasi pada Pembangkit Listrik Tenaga Diesel PT. Cogindo Daya Bersama – Kupang NTT Filisianus Lende; Ishak S. Limbong; Wenseslaus Bunganaen
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27054

Abstract

Analysis of the quality of marine fuel oil (MFO) from the separation process at the diesel power plant of PT. Cogindo DayaBersama Tenau is needed to increase the calorific value of the MFO. Tests were conducted using a bomb calorimeter to calculate the energy capacity value, a centrifuge to determine the sediment volume, and observations made using a microscope to investigate the particles in the MFO. The test results (using a bomb calorimeter) showed that the energy value of the MFO that had not been separated and that had been separated was 7,776 cal/g and 8,298 cal/g (6.71% greater). The test results (using a centrifuge) also showed that the average sediment volume value of the MFO fuel that had not been separated and that had been separated was 6,273 cm³ (96.67% sediment) and 0.216 cm³ (3.33% sediment). Microscope observations showed that separated MFO was superior to unseparated MFO, as it contained more particles than unseparated MFO. These results indicate that the MFO separation process at PT Cogindo Daya Bersama has been carried out effectively
Alat Penggorengan Abon Ikan Berpenggerak Motor Listrik 200 Watt Yohanes T. Luluk; Ishak S. Limbong; Jack C.A. Pah; Murni Pallawagau
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27056

Abstract

Fisheries play a crucial role in the Indonesian economy, particularly for fishermen and coastal communities. However, fishery products such as fish floss have problems in the frying process, which requires continuous human power to stir. This research aims to design and develop a fish floss frying device powered by an electric motor with a driving power of 200 W. This tool is expected to facilitate the fish floss frying process, reduce the energy expended by the fish floss maker, and increase the efficiency of the production process. This research uses data collection methods, tool design, and tool testing. Autodesk Inventor software was used in the design stage to design the tool frame, stirrer, and pan holder. This tool includes an electric motor, gearbox, pulley, V-belt, and frying pan. Then, the tool was made using a hollow iron box, a stainless-steel pipe, and wood. This research yields a fish floss fryer equipped with an electric motor, capable of frying fish floss with a capacity of up to 3 kg. This tool can help ease the work of frying fish floss, save labour, and increase production efficiency. With a driving power of 200 W, this tool can produce good-quality fish floss
Automatic Feeder Machine with Water Filter System Untuk Budidaya Ikan Nila Golden R. Modok; Ishak S. Limbong; Verdy A. Koehuan; Murni Pallawagau
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27057

Abstract

The fisheries sector is one of the key drivers of the Indonesian economy. One type of fish that is widely cultivated is tilapia. The market demand for tilapia is increasing annually. However, in general, tilapia farmers still employ conventional methods in fish farming, such as feeding fish and maintaining pond cleanliness. Of course, this method is more tiring and requires a lot of time. The purpose of this study is to design an automatic feeder equipped with a filter system to control fish feeding, in conjunction with a water purification system for fish ponds. The study was conducted by building an automatic feeder machine for automatic feeding and an automatic filter to control the quality of water clarity in the pond. From the test results, the amount of feed dispensed by the automatic feeder in 30 seconds, 40 seconds, 50 seconds, and 60 seconds was 142.2 g, 189.9 g, 231.8 g, and 269.2 g, respectively. The throwing distance and distribution of feed were 3 m and 70 °. The proximity sensor is used to control the availability of feed in the storage tube, providing a warning if the amount of feed is less than the minimum limit. The filter system automatically operates when the water turbidity exceeds 40 NTU
Sistem Otomasi Pengendali pH Dan Oksigen Untuk Kolam Budidaya Ikan Liberatus Liem; Ishak S. Limbong; Ben V Tarigan; Murni Pallawagau
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27058

Abstract

In the development of fisheries, especially in tilapia cultivation, promising prospects have emerged with high market demand. However, fish farming still tends to use conventional methods that pay little attention to water quality. This deficiency can cause serious problems for fish health and quality, potentially detrimental to cultivation activities. To optimize fish growth, pH and dissolved oxygen control are necessary. This study created a microcontroller-based automation system to control pH (5-8.5) and dissolved oxygen (> 5 mg/L) in tilapia ponds. Field testing showed that the pH and dissolved oxygen sensors have low error rates of 5.07% and 4.80%, respectively. Laboratory testing showed that the system worked successfully with relative error percentage values of pH and DO testing of 5.71% and 20% of the setpoint.
Rancang Bangun Alat Pengasap Ikan Se’i dengan Sistem Vertikal dan Horizontal Aristo Sixtus Gonsani; Gusnawati Gusnawati; 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.v13i01.18050

Abstract

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
Perancangan Sistem Pembangkit Listrik Tenaga Surya untuk Konversi Energi Termal pada Baterai Pasir Theodorus Mara Dosi; Verdy A. Koehuan; 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.v13i01.18096

Abstract

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.
Pengaruh Perlakuan Karburising Menggunakan Arang Kayu Kusambi Terhadap Kekerasan Material Pada Spesimen Tooth Bucket Excavator Mohammad Fadel; Erich U. K. Maliwemu; 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.v13i01.19244

Abstract

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.
Bangun dan Pengujian Alat Pencetak Briket Silinder dan Kubus Berlubang Tengah Menggunakan Variasi Putaran Jason Yuniando Willa Here; Jack C.A. Pah; Muhamad Jafri
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.v13i01.19389

Abstract

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.

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