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Rachmat Subagyo
Lambung Mangkurat University
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Perancangan Alat Pengering Lombok Solar Technology bagi Kelompok Tani Desa Guntung Manggis Rachmat Subagyo; Muhammad Nizar Ramadhan; Ma'ruf Ma'ruf; Mohd Azlan; Ibrahim Husein; Muhammad Zainul Rusdi; Trendy Pratama
Jurnal Pengabdian ILUNG (Inovasi Lahan Basah Unggul) Vol 2, No 2 (2022)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/ilung.v2i2.6117

Abstract

Cabai merupakan komoditi yang penting di Indonesia dan tidak dapat di pisahkan dari kebutuhan sehari-hari di dalam rumah tangga. Untuk meningkatkan nilai ekonomis cabai maka perlu dilakukan proses pengeringan. Tujuan penelitian ini untuk memahami distribusi temperatur dan proses aliran udara pada sistem pengeringan kolektor surya jenis Tray Dryer Solar Technology. Metode yang digunakan adalah simulasi CFD (Computational Fluid Dynamics) menggunakan data kecepatan angin diwilayah Banjarbaru. Hasil penelitian ini menunjukkan bahwa kecepatan udara yang meningkat mengakibatkan putaran Turbin Ventilator semakin kuat begitu juga terjadi pada daya isapnya, kondisi ini mengakibatkan temperatur lebih terdistribusi secara merata sehingga proses pengeringan semakin baik. Hambatan pada setiap baki (tray) berfungsi untuk membuat aliran udara panas menjadi berolak sehingga perbedaan temperatur pada bagian dinding semakin berkurang. Peningkatan kecepatan angin mengakibatkan Distribusi Temperatur semakin merata, tetapi perlu dilakukan optimasi untuk mengetahui kecepatan angin yang sesuai yang mampu untuk meningkatkan kualitas pengeringan yang terbaik.
Effects of Eugenol and Cineol Compound on Diffusion Burning Rate Characteristics of Crude Coconut Oil Droplet Helen Riupassa; Suyatno Suyatno; Hendry Y. Nanlohy; Andi Sanata; Trismawati Trismawati; Rachmat Subagyo; Satworo Adiwidodo; Muhammad Akhlis Rizza; Masaki Yamaguchi; Takuya Tomidokoro; Selcuk Sarikoc
Automotive Experiences Vol 6 No 1 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.8150

Abstract

The burning rate of coconut oil droplets has been investigated experimentally by adding bio-additives of clove oil and eucalyptus oil. Tests were carried out with single droplets suspended on thermocouples at room atmospheric pressure, and room temperature and ignited with a hot wire. The addition of clove oil and eucalyptus oil as bio-additives into coconut oil was 100 ppm and 300 ppm, respectively. The droplet combustion method was chosen to increase the contact area between the air and fuel so that the reactivity of the fuel molecules increases. The results showed that the eugenol compounds contained in clove oil and cineol compounds in eucalyptus oil were both aromatic, and had an unsymmetrical carbon chain geometry structure. Furthermore, this factor can potentially accelerate the occurrence of effective collisions between fuel molecules. Therefore the fuel is combustible, as evidenced by the increased burning rate, where the results show that without bio-additives, the burning rate of crude coconut oil (CCO) is about 0.7 seconds. These results are 0.15 to 0.2 seconds slower than CCO with bio-additive, which is around 0.55 to 0.6 seconds. Moreover, from the observations, it was found that the highest burning rate was achieved in both bio-additives with a concentration of 300 ppm.
VARIASI KONDUKTIVITAS TERMAL PADA PROSES PEMOTONGAN SS400 DENGAN MEDIA PENDINGIN DROMUS TERHADAP KEKASARAN PERMUKAAN Mastiadi Tamjidillah; Rachmat Subagyo; Rudi Siswanto; Dhonie Adetya Rachman
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1083

Abstract

Thermal conductivity is a transport phenomenon where the temperature difference causes the transfer of thermal energy from the tip of the blade to the workpiece. The value of thermal conductivity is important for good conductors of surface roughness. Thermal conductivity is influenced by several factors, such as temperature, porosity, and voids. The effect of temperature on thermal conductivity is relatively small, but the conduction increases as the temperature increases, the larger the cavity, the less good the conductivity, which causes low surface roughness. This cutting process pays attention to parameter settings such as temperature, cutting speed, type of knife, and material. Likewise, fluid mechanics and hydraulics parameters such as the velocity of the cooling medium out, the pump pressure, the nozzle cross-sectional area, and the type of cooling medium. The thermal conductivity parameter is set to get the surface roughness results that vary due to thermal changes. Using the Waterjet Cutting Machine for the cutting process of SS400 Steel with a thickness of 12 mm with dromus cooling media to reduce thermal effects and reduce conductivity. With this dromus cooling medium, it is hoped that the surface roughness will be more optimal and avoid overheating. Using the Waterjet Cutting Machine for the cutting process of SS400 Steel with a thickness of 12 mm with dromus cooling media to reduce thermal effects and reduce conductivity. With this dromus cooling medium, it is hoped that the surface roughness will be more optimal and avoid overheating. By varying the temperature between the knife tip and the workpiece, good surface roughness is obtained at variations of the stand off distance of 8, 10, 12 mm, with a dromus at temperatures T1=47, T2=39 and T3=32, fluid velocity 300m/s, and pump pressure. 50.000 psi at turbulent flow Re 4000 gets the optimum result on the surface roughness test, which is 3.47 m.
Perancangan Alat Pengering Pada Proses Produksi Kapsul Daun Kelor bagi Kelompok Tani Desa Guntung Manggis Rachmat Subagyo; Muhammad Nizar Ramadhan; Ma'ruf Ma'ruf; Azie Aprianto; Muhammad Nazief Maulidinnur; Deni Saputra; Annisa Nurul Kharisma; Mutea Putri Dwianto; Devina Yulie Fatria; Siti Rabiatul Adabiah
Jurnal Pengabdian ILUNG (Inovasi Lahan Basah Unggul) Vol 3, No 2 (2023)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/ilung.v3i2.10551

Abstract

 Guntung Manggis Village is one of the sub-districts located in Landasan Ulin District, Banjarbaru City, South Kalimantan Province. Some of the problems in the Guntung Mangosteen subdistrict that were obtained based on the survey results were that the drying process for making moringa leaf capsules was quite time consuming because they could not be dried directly in the sun. And the hygienic and clean drying process for Moringa leaves meets health standards. The method for solving this problem is to design and manufacture a hygienic Moringa leaf dryer. To perfect the manufacture of a Moringa leaf dryer, it is necessary to carry out a simulation first. The simulation results show that a dryer that uses 15 Watt lamp power has a better heating process because the entire heating area is a homogeneous blue color so that the drying process will take place evenly. This drying process is the best where there is no excess temperature at the base of the tool so it does not require a blower to remove heat. The dryer is more efficient because the lamp power is small and does not require a blower to homogenize the temperature of the dryer.
Igniting the flame, maximizing energy: The effectiveness of nutmeg oil as a bioadditive in B20 droplet combustion Rachmat Subagyo; Mastiadi Tamjidilah; Abdul Ghofur; Rudi Siswanto; Ma'ruf Ma'ruf; Wardoyo Wardoyo; Muchsin Muchsin; Purnomo Purnomo; Atma Cahyo Anggono; Faisal Fadillah; Anugrah Perdana Putra
Mechanical Engineering for Society and Industry Vol 5 No 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.14499

Abstract

This study aims to experimentally investigate the effect of adding nutmeg oil (Myristica fragrans) as a bioadditive on the combustion characteristics of Biosolar B20 fuel droplets, addressing its inherent drawbacks such as longer ignition delay and incomplete combustion. Nutmeg oil iss selected due to its high oxygenated compound content and potential to enhance combustion efficiency and ignition quality. Key parameters examined include ignition delay time, combustion duration, burning rate, flash point, flame height, and peak temperature during the combustion process. Nutmeg oil was added in volumes ranging from 1 to 5 mL to the B20 mixture, and the combustion experiments were carried out using a droplet-based method to observe ignition and burning behavior under controlled conditions. The results showed that the addition of nutmeg oil significantly reduced the ignition delay time from 6.74 seconds (pure B20) to 1.38 seconds (5 mL nutmeg oil), along with decreases in combustion duration and flash point. Conversely, the burning rate increased from 0.53 mm²/s to 1.04 mm²/s, and the maximum temperature rose from 409.4°C to 553.3°C. GC-MS analysis revealed an increase in active volatile compounds such as α-pinene and myristicin, which enhanced the combustion process. ANOVA and Tukey HSD statistical tests confirmed that the differences among treatments were statistically significant (p < 0.05). Overall, this study highlights the potential of nutmeg oil–blended B20 fuel for practical engine applications and its contribution to sustainable energy development.
ANALISIS ELEMEN HINGGA BERBASIS ANSYS PADA SAMBUNGAN BAUT STRUKTUR COOLING TOWER Rachmat Subagyo; Riyki Apriandi; Rakyan Permadi; Yanuar Iswahyudi; Renal Fajri
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.763

Abstract

The cooling tower is a crucial component in industrial cooling systems, serving to dissipate heat from the working fluid. One of the main structural elements in a cooling tower is the bolt, which connects various components and plays a role in bearing mechanical loads. This study aims to perform numerical modeling and simulation of bolts within the cooling tower structure to understand the stress and deformation distribution under operational loads. The simulation was conducted using the finite element method based on ANSYS software, applying a pretension force of 200 Nm and a thermal load of 40 °C. The results show a maximum stress of 0.327 MPa at the contact area between the bolt head and the connecting plate, with a total deformation of 5.08×10⁻⁵ mm. The observed stress concentration indicates a potential risk of fatigue failure at the joint. This study provides valuable insights into the optimization of bolt design and material selection to enhance the cooling tower's resistance to operational loads.
Co-Authors Abdul Ghofur Abdul Ghofur Andi Sanata Annisa Nurul Kharisma Anugrah Perdana Putra Arry Eko Pristiwanto Atma Cahyo Anggono Azie Aprianto Bagaskoro Rizqining Hendratno Bayu Aditya Wisnu Dedi Muliadi Deni Saputra Devina Yulie Fatria Dhonie Adetya Rachman Fadliyanur Faisal Fadillah Feri Oktapiyanor Gunawan Rudi Cahyono Helen Riupassa Hendry Y. Nanlohy Herry Irawansyah Ibrahim Husein Imam Ahdi Saga Isworo, Hajar M. Reynaldi Perdana Saputra Ma&#039;ruf Ma&#039;ruf Ma'ruf Ma'ruf Masaki Yamaguchi Mastiadi Tamjidilah Mastiadi Tamjidillah Mohd Azlan Muchsin Muchsin Muchsin Muchsin Muhammad Akhlis Rizza Muhammad Nazief Maulidinnur Muhammad Nizar Ramadhan Muhammad Zainul Rusdi Mutea Putri Dwianto Purnomo Purnomo Rakyan Permadi Renal Fajri Riyki Apriandi Roni Wijaya Rudi Siswanto Rudi Siswanto, Rudi Satworo Adiwidodo Selcuk Sarikoc Siti Rabiatul Adabiah Suyatno Suyatno Takuya Tomidokoro Trendy Pratama Trismawati Trismawati Wahyu Arifin Wardoyo Wardoyo Yanuar Iswahyudi