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All Journal ROTOR: JURNAL ILMIAH TEKNIK MESIN JURNAL CRANKSHAFT Abdimas Universal Scientific Journal of Mechanical Engineering Kinematika Jurnal Mekanik Terapan ARMATUR : Artikel Teknik Mesin dan Manufaktur Sibatik Journal : Jurnal Ilmiah Bidang Sosial, Ekonomi, Budaya, Teknologi, Dan Pendidikan AMMA : Jurnal Pengabdian Masyarakat AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin
Rijal Surya Rahmany
Institut Teknologi Kalimantan
Aerospace Engineering Arts Humanities Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Social Sciences Other

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OPTIMIZATION OF MOUNTAIN BIKE FRAME DESIGN: LOADING VARIATIONS USING HIGH STRENGTH CARBON Ivan Wiyarta Cakra Sujana, I Made; Batubara, Yongki Christandi; Rahmany, Rijal Surya
ROTOR Vol. 17 No. 2 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i2.52991

Abstract

Mountain bikes have become a popular mode of transportation and recreation among extreme sports enthusiasts. A strong and lightweight frame design is crucial to support performance and ensure rider safety, especially in challenging terrain conditions. This study aims to explore the optimization of mountain bike frame design with a focus on the use of high-strength carbon materials. The research evaluates the performance and durability of the frame through Von Mises stress analysis, displacement, and safety factor under load variations of 65 kg, 70 kg, and 75 kg. The analysis results show that the stress increases with the load, from 7.298 MPa at 65 kg to 8.421 MPa at 75 kg. Displacement also increases, from 0.004982 mm to 0.005748 mm. The safety factor remains above 15, indicating a high safety margin for the material. These findings suggest that although stress and deformation increase, the frame design still meets the strength standards required for user safety. This research contributes significantly to the development of more efficient, sustainable bicycles, and serves as a reference for manufacturers in designing safe and comfortable products. Recommendations for further testing include dynamic load analysis to understand the frame's behavior under real-world usage conditions. Keywords: AL 6061, Mountain Bike Frame, Simulation
DESIGN OF A 100 KG CAPACITY WORKING LIFT CART FOR SMALL-SCALE INDUSTRIAL APPLICATIONS Apriandi, Riyki; Rahmany, Rijal Surya
ROTOR Vol. 17 No. 2 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i2.53085

Abstract

To accommodate heavy tool movement, forklifts are commonly used. However, a forklift is too large for use in confined workspaces within small industries. Therefore, it is proposed that a 'Working Lift Cart' be designed with a compact size. This research aims to design and develop a compact lift cart that offers flexible movement and reduces operational risks compared to existing forklift products. The method employed in this research involves a direct analysis of two proposed product plan concepts. The proposed concepts are selected based on a needs analysis. The chosen concept undergoes a safety risk analysis from the operator's perspective using the RULA method, while the product design is subjected to static stress analysis on the frame and the lifter. The results indicate that the second concept, with greater operational flexibility, is chosen. The RULA analysis, conducted using CATIA software, indicates that operating with a remote controller is significantly safer and less prone to injury. However, manual operation is retained for usability purposes. The analysis of the frame structure and lifter shows that the proposed design is safe for a 100 kg load on the lifter. Keywords: Working Lift Cart, Design, RULA, Static Stress Analysis
KAJI SIMULASI VARIASI KECEPATAN INLET AIR PADA MICROBUBBLE GENERATOR TIPE ALIRAN SWIRL DENGAN BAFFLE OUTLET Batubara, Yongki; Surya Rahmany, Rijal; Ivan Wiyarta Cakra Sujana, I Made
SIBATIK JOURNAL: Jurnal Ilmiah Bidang Sosial, Ekonomi, Budaya, Teknologi, Dan Pendidikan Vol. 5 No. 3 (2026)
Publisher : Penerbit Lafadz Jaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/sibatik.v5i3.4515

Abstract

The need to improve water quality in the aquaculture and wastewater treatment sectors has driven the development of more efficient aeration technologies. Conventional aerators generally produce large bubbles, resulting in relatively short air-water contact times and low oxygen transfer efficiency. Microbubble generators (MBG) are one solution to this problem because they can produce micro-sized bubbles with a large specific surface area and low-rise velocity. Simulations were performed using the computational fluid dynamics (CFD) method with the Eulerian approach and the k–ε standard turbulence model. The water inlet velocity was varied from 11 to 15 m/s, while the air inlet pressure was set at atmospheric pressure. The simulation results showed that the swirl flow pattern inside the chamber was able to significantly reduce the pressure around the gas nozzle tip. Negative pressure began to form at an inlet water velocity of 13 m/s with a minimum pressure value of −14.05 kPa and decreased further to −50.9 kPa at a velocity of 15 m/s. These results indicate that an increase in swirl flow velocity directly affects the MBG's ability to generate negative pressure and automatically suck in air. The findings of this study can be used as a basis for the design and selection of suitable pumps for swirl-type microbubble generator applications.
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.
SIMULASI PENGGUNAAN PANEL SURYA ATAP DI LINGKUNGAN KAMPUS POLITEKNIK BATULICIN Rijal Surya Rahmany; Jefri Aldo; Halim
Scientific Journal of Mechanical Engineering Kinematika Vol 8 No 1 (2023): SJME Kinematika Juni 2023
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v8i1.254

Abstract

The massive use of fossil energy will cause a buildup of CO2 gas from combustion. The Indonesian government is targeting the use of renewable energy as a solution. The renewable energy source that can be chosen is solar energy. However, the use of solar panels requires a plan so that they can operate optimally according to the conditions of the installation area. Therefore, it is necessary to study the use of solar panels on the roofs of buildings as a concrete manifestation of meeting the set targets. In this research, an analysis of electrical energy needs was carried out in Building A of the Batulicin Polytechnic (Polibali), and a simulation of the use of solar panels on the roof of Building A Polibali was conducted to obtain system specifications that could be built. The method used is a direct measurement of electricity usage data in Building A Polibali and a simulation of electrical energy that can be produced from installing solar panels using premium PVSol software. Considering the roof area, 180 solar panel modules were selected with a power rating of 285 W per module and a tilt angle of 15 degrees, so that the simulated system power was 51,3 kWp. The results obtained show that the planned production of electrical energy from solar panels can exceed the overall electricity consumption needs of Building A Polibali, which is 26,512.9 kWh per year, with production from solar panels of 75,217 kWh per year.
Co-Authors Al Wafi, Rifqi ALDO, JEFRI Am, Chaerul Qalbi Amba Matarru, Andre Apriandi, Riyki Ardi Dwi Pramana, Muhammad Bima Jagad Saksana, Febrillian Devy Setiorini Sa’adiyah Djafar, Alfian Fahrizul Hasmi, Achmad Gad Gunawan Halim Haliq, Ridwan Hariz Dedy Sayogi, Muhammad Haryono, Hadhimas Dwi Hasiholan Lumban Tobing, Kevin Hendi Prasetya, Bagas Hidayat, Dinda Khoirunnisa Ivan Christofel Hutabarat, Frans Jefri Aldo Julian, Lindra Rahmad Rizqi Kholiq Deliasgarin Radyantho Linda Mahmudi Syahlie, Razif Manta, Faisal Marshantya, Defiana Mungil Kurniawati, Diniar Orientius Paseru, Ricko P Pamungkas, Janlemi Parsaulian Lobo Silalahi, Yonathan Qalbi AM, Chaerul Rajagukguk, Grendy Ary Krishna Rizqi Fahrezi, Dimas Saputra, Ferry Adi Setiorini Sa’adiyah, Devy Stofani, Dhio Suanggana, Doddy Suardi Suardi Sujana, I Made Ivan Wiyarta Cakra Syaharani, Destyana Putri Syaiful Umara, Muhammad Yasin, Hamzah Ibnu Yongki Christandi Batubara Yuike, Ariesta Zufadli, Muhammad Syahmi