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EKO BUDIYANTO
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INDONESIA
ARMATUR : Artikel Teknik Mesin dan Manufaktur
Published by Universitas Muhammadiyah Metro
ISSN : 2722080X     EISSN : 27220796     DOI : https://doi.org/10.24127
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
ARMATUR : Artikel Teknik Mesin dan Manufaktur [ISSN (online) : 2722-0796, ISSN (cetak) : 2722-080X], merupakan jurnal terbitan berkala yang diterbitkan oleh Program Studi Teknik Mesin, Fakultas Teknik, Universitas Muhammadiyah Metro. ARMATUR terbit 2 kali dalam setahun bulan Maret dan September, memuat hasil-hasil penelitian dalam bidang Teknik Mesin dan Manufaktur. Dalam sekali penerbitan, ARMATUR memuat 5-10 artikel dengan 5-10 halaman per artikel. Proses penerimaan naskah jurnal sepenuhnya dilakukan melalui Online Journal Sistem (OJS).
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 147 Documents
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Pengaruh variasi Tekanan dan level air tangki Hydrophore terhadap laju aliran massa pada sistem distribusi air tawar -, Susanto; Gunawan Budi Santoso; Yulius Oscar; Wahyu Ari Putranto; Widar Bayu Wantoro
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10786

Abstract

The paper is The performance of water distribution in buildings is strongly influenced by the relative position of the reservoir and the outlet pipe. This represents an important technology transfer for enhancing building services engineering. This study examines the performance of a hydrophore system under variations in pipe height, water level, and tank pressure. Experiments were conducted using pipe heights of 1, 2, and 3 meters; water levels of ¼, ½, and ¾ of the tank capacity; and tank pressures of 1, 2, and 3 bar. Pressure adjustments were made by adding or releasing compressed air. System performance was evaluated by measuring the mass flow rate through one, two, and three outlet pipes operated individually and simultaneously. The highest mass flow rate for a single outlet pipe was achieved at a ½ water level and 3 bar pressure, yielding 67.87 kg/min through outlet pipe 2. For two outlet pipes, the maximum values were obtained at a ¼ water level and 3 bar, producing 72.75 and 73.25 kg/min. With all three outlets open, the highest flow rate reached 79.69 kg/min at a ½ water level and 3 bar. Overall, water level, tank pressure, pipe height, and the number of open outlets significantly affect distribution performance and must be considered in system design for multi-level buildings
Studi Eksperimental Twin Waterjet Thruster Menggunakan Thermoplastic Polyurethane (TPU) yang Diproduksi dengan 3D Printing Hasdiansah, Hasdiansah; Muhamad Aris; Pristiansyah; Ramli; Sugianto; Ferzy Ersandy; Achmad Rusdy; Hafiz Fadhil; Muhammad Subhan
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10222

Abstract

Indonesia, as the world’s largest archipelagic nation, requires efficient and reliable marine propulsion systems to support sustainable transportation. The waterjet thruster has emerged as an alternative to conventional propellers due to its advantages in maneuverability, cavitation resistance, and operational efficiency. With the advancement of additive manufacturing, particularly 3D printing, opportunities have arisen to fabricate propulsion components using innovative materials such as Thermoplastic Polyurethane (TPU), which combines flexibility and durability.This study presents the design, fabrication, and experimental testing of a twin waterjet thruster produced with TPU material through the Fused Deposition Modeling (FDM) method. Performance tests were conducted using a 22 HP combustion engine at 4,100 rpm. The experimental results indicate that the thrust generated ranged between 10.8–12 kg (equivalent to 105.94–117.72 N) with an average thrust of 11.36 kg (111.24 N). These outcomes demonstrate that the system delivers consistent performance with minimal variation between trials. The findings confirm the feasibility of TPU-based twin waterjet thrusters for small to medium-scale marine applications and provide a basis for further development toward environmentally friendly propulsion systems through design optimization and the integration of electric motors.
ANALYSIS OF THE EFFECT OF LOAD VARIATIONS ON THE THERMAL EFFICIENCY OF THE MUARA KARANG PLTG GAS TURBINE Banjarnahor, Anugerah; Hendri; Muhammad Ridwan
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10393

Abstract

Gas turbines are one type of power plant with high flexibility, but their performance is greatly affected by variations in operating load. This study aims to analyse the effect of load variations on the thermal efficiency of Gas Turbine Unit 1.2 at the Muara Karang Gas Power Plant under three load conditions, namely 70 MW, 80 MW, and 90 MW. Actual operational data was used to calculate component work (compressor, combustion chamber, and turbine) and cycle thermal efficiency using thermodynamic calculation methods based on the Brayton Cycle. The calculation results were validated using Cycle Tempo and EES (Engineering Equation Solver) software with an average deviation of <5%. The results show that thermal efficiency increases as the operating load increases. At a load of 70 MW, the thermal efficiency was recorded at 30.30%, increasing to 30.76% at a load of 80 MW, and reaching a peak of 31.72% at a load of 90 MW. These findings prove that gas turbines operate most efficiently at loads close to their maximum capacity, so that operating at optimal loads can reduce specific fuel consumption and improve the energy efficiency of the plant.
Pengembangan Sistem Irigasi Cerdas Bertenaga Surya dengan Monitoring Kelembaban Tanah untuk Pertanian Berkelanjutan Purnomo, Purnomo; Pardamean Naibaho, Sahabman Tua; Putri , Nabila Adelia; Dzaki, Muhammad Fadhil
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10493

Abstract

Water availability is essential for agricultural productivity in Indonesia, especially in addressing climate change and the inefficiency of conventional irrigation systems. This study presents the design and testing of a solar-powered smart irrigation system that integrates Internet of Things (IoT) technology for efficient and sustainable water management. The system consists of an Arduino Uno, YL-69 soil moisture sensor, YF-S201 water flow sensor, 12V DC pump, and a 120 Wp solar panel as an independent energy source. It operates automatically by activating the pump when soil moisture falls below a set threshold and stopping it when optimal moisture is achieved. Test results show that the YL-69 sensor effectively detects soil moisture levels ranging from 31–81%RH, with an average increase of 40.6%RH after irrigation. The YF-S201 sensor demonstrated high accuracy with an average flow rate of 20 L/min and an error rate of only 0.89%. The pump operated steadily with an average current of 6.34A and power of 74.2W, while the solar panel produced an average of 11.88V and the battery 11.64V. Overall, the system efficiently optimizes water and energy use, supporting sustainable agriculture. Future improvements should focus on increasing battery capacity and calibrating the soil moisture sensor for more stable and accurate performance.
Evaluasi Kinerja Termal Sistem HVAC Tipe Split duct Menggunakan Refrigeran R-410A pada Bangunan Dua Lantai Ardiansyah, Rizqi; Hidayat, Gunawan; Effendi, Riki
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10655

Abstract

Experimental evaluation of the thermalperformance of the split duct type Heating,Ventilation, and Air Conditioning (HVAC) systembased on R-410A refrigerant in a two-story building ina tropical climate. The main focus of the research isdirected at the characteristics of temperaturedistribution, heat transfer capacity, performancecoefficient (Coefficient of Performance - COP), aswell as thermal efficiency of the Carnot cycle. Testingwas carried out for four weeks in real operatingconditions with direct measurements at the diffuserpoints to obtain parameters of temperature, pressure,and compressor power. The experimental results showthat the temperature of the compressor and condenserincreases proportionally to the cooling load, while thetemperature of the evaporator is stable in the range of255-275 K. The COPactual value ranges between 2.8-3.5, with a system efficiency of 50-85% compared toideal conditions. The higher performance on thesecond floor emphasizes the influence of the verticalthermal load on the actual cooling capacity. Overall,the split duct system based on R-410A shows goodoperational stability and energy efficiency, making itsuitable for cooling applications in low-rise buildingsin tropical climates.
Inovasi Solar Dryer Aktif untuk Meningkatkan Kualitas dan Efisiensi Pengeringan Biji Kakao Pascapanen Mufarida, Nely Ana; Effendy , Machmud; Ariyani, Sofia
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10694

Abstract

Drying is a crucial stage in post-harvest handling of cocoa beans because it significantly determines the final quality, storage stability, and market value of the product. Traditional drying methods, still widely used by farmers, often face challenges such as weather dependence, long drying times, and the risk of contamination. This study aimed to evaluate the performance of an active solar dryer as a more efficient and hygienic alternative technology. A prototype was designed using solar collectors and a solar panel-powered ventilation system to maintain a steady flow of hot air throughout the drying process. The results showed that the active solar dryer was able to maintain a drying temperature of 45–60°C, reducing the moisture content of cocoa beans from approximately 58% to 7% in 48–72 hours. In contrast, traditional methods require 120–144 hours to achieve the same moisture content. The physical quality of cocoa beans produced by the active solar dryer was superior, with a more uniform color, an even dry texture, and no signs of case hardening. Furthermore, the fermentation aroma was stronger and the level of microbial contamination was lower than that of traditional drying. Overall, the active solar dryer technology has been shown to improve drying efficiency and cocoa bean quality, thus offering potential for widespread adoption at the farmer level.
Analisis Energy Efficiency Ratio (EER) pada AC Split yang Diretrofit dari Refrigeran R32 ke R290 dengan Massa Pengisian 40 Persen Ulum, Rizka; Budi Santoso, Gunawan; Ngatmin; Susanto; Anang Budhi Nugroho, Anang; Pujianto, M. Edi
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10830

Abstract

The extensive use of split-air conditioning in tropical countries raises environmental concerns because of the high global warming potential of R32 refrigerant. The hydrocarbon refrigerant R290 offers a promising alternative with a very low gross pollutant content (less than 4) and a near-zero ozone depletion potential. However, its flammability and impact on performance at reduced charge densities require further investigation. This study assesses the energy efficiency ratio (EER) of 1 PK split AC retrofitted with 40% charge weight from R32 to R290. The experimental tests were carried out under five operating conditions with room temperature of 23-27 degrees Celsius and ambient temperature of 30-35 degrees Celsius. System parameters including pressures, temperatures, compressor power consumption and the flow rate of the refrigerant were measured. The software REPROP was used for the thermodynamic analysis and the EER calculation. The results show that R32 achieves a higher EER (24.59-26.35 Btu per kWh) than R290 (15.33-17.21 Btu per kWh), resulting in a reduction of efficiency of 30-45 percent. Although R290 showed lower power consumption (0.446-0.476 kW compared to 0.76-0.82 kW in R32), the reduced mass flow rate reduced the cooling capacity. The study concluded that the 40 percent R290 retrofit reduces energy consumption but compromises energy efficiency, which requires further research on optimised weight and system components.
Analisis pengaruh koefisien konveksi media pendingin terhadap temperatur panel surya dengan perendaman sebagian (Partially Submerged Photovoltaic) Rahmany, Rijal Surya; Sujana, I Made Ivan Wiyarta Cakra; Batubara, Yongki Christandi
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10902

Abstract

One of the main challenges in PV system deployment is the increase in panel operating temperature, which leads to a reduction in energy conversion efficiency, particularly in tropical regions with high solar irradiance. Potential solution to mitigate this issue is the partially submerged photovoltaic (PSPV) system. This study aims to analyze the influence of convective heat transfer coefficients on the surface of a PSPV system on the operating temperature of photovoltaic panels using a numerical modeling approach. The research methodology involves the development of an energy balance model that accounts for the contributions of solar radiation, convective heat transfer, and thermal radiation. The panel area is divided into two equal sections with a 50:50 ratio, consisting of a submerged portion and an air-exposed portion. The convective heat transfer coefficients for the submerged section are set to 100 W/m²K for both the upper and lower surfaces. For the air-exposed section, the upper surface convective heat transfer coefficient is varied between 10 and 70 W/m²K, while the lower surface coefficient is maintained at 10 W/m²K. Simulation results indicate that the presence of water as a cooling medium significantly reduces the panel operating temperature to approximately 31 °C, compared to a fully air-exposed panel configuration, which reaches an operating temperature up to around 55 °C.
Pendahuluan Desain dan Analisis Pembebanan Statis Klem Penahan Pipa Air: Pendahuluan; Hasil dan Pembahasan; Kesimpulan; Ucapan terima Kasih tuati, amros; Jhon A. Wabang; Paula Rita; Jonri L. Ga; Hero P. Dida
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10907

Abstract

This This study aims to design and analyze static loading on a metal water pipe clamp using Finite Element Analysis (FEA) based simulation in Solidworks. The analysis was performed at four static loading variations: 250 N, 500 N, 750 N, and 1000 N, to determine the structural response in terms of stress, displacement, strain, and safety factor. The simulation results show that increasing the loading force significantly affects the stress and deformation values. At 250 N, the clamp remains secure with a high safety factor. Then, at 1000 N, the stress and strain increase significantly, and the safety factor decreases, approaching the material's safety limit. Overall, the clamp design is still capable of supporting loads up to 1000 N. However, shape optimization or increasing the material thickness is needed to improve safety when used under continuous heavy load conditions. The highest von Mises stress is 8.512e-07 N/mm2, displacement 9.041e+2 mm, strain 2.140e-04 N/mm2 and safety factor 2.609e+01.
Analisa Motor Gearbox N20 Untuk Prototipe Katrol Pengering Pakaian Otomatis Berbasis Mikrokontroler Untuk Daerah Pegunungan Nongkojajar Pasuruan Makhrus, Subekhan; Muhammad Badaruz Zaman
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.9678

Abstract

The sun is the primary source of energy for human life, both in the form of light and heat. In mountainous areas such as Nongkojajar, Pasuruan, low sunlight intensity and high rainfall often hamper the clothes-drying process. This condition creates a need for automated solutions that can assist people in their daily activities. This research aims to design and test the effectiveness of a microcontroller-based automatic clothes dryer pulley prototype, which can operate independently based on sunlight intensity. This device uses a light sensor to detect cloudy weather and automatically pulls the clothesline indoors. This research is expected to provide practical solutions for communities in mountainous areas, while also increasing knowledge regarding the application of microcontroller-based automated systems.

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