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ROTOR: JURNAL ILMIAH TEKNIK MESIN
Published by Universitas Jember
ISSN : 1979018x     EISSN : 24600385     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
ROTOR merupakan jurnal yang diterbitkan oleh Jurusan Teknik Mesin Universitas Jember yang memuat artikel ilmiah dalam bidang Konversi Energi, Design/Perancangan, Teknik Produksi, Material serta bidang lain yang terkait dengan Teknik Mesin. Semua naskah yang diterima ROTOR diterbitkan secara global dalam bentuk elektronik. Hasil penelitian yang diterbitkan dalam jurnal ini diharapkan dapat menambah khasanah pengetahuan di bidang Teknik Mesin serta menjadikan sarana bagi para profesional baik dari dunia usaha, pendidikan, ataupun peneliti untuk menyebarluaskan perkembangan ilmu pengetahuan dan teknologi di bidang Teknik Mesin melalui publikasi hasil penelitian.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 333 Documents
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EFFECT OF VOLUME FRACTION OF GENETICALLY MODIFIED ORGANISM (GMO) SUGARCANE BAGASSE FIBER ON THE MECHANICAL PROPERTIES AND MORPHOLOGY OF BIOCOMPOSITE Anuary Dwi Rosyid, Wafa Prasetia; Sakura, Rahma Rei; Djumhariyanto, Dwi; Asrofi, Mochamad; Setyawan, Digdo Listyadi; Sugiharto, Bambang; Junus, Salahuddin; Dwilaksana, Dedi
ROTOR Vol 16 No 2 (2023)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v16i2.41551

Abstract

Science and technology are currently developing in all fields, such as vehicle construction, building construction, industry, and materials engineering. Especially in the field of material engineering used for the manufacture of composite materials. Currently the transition of materials from metal to composites is also in great demand in various fields including in the automotive, transportation, shipping, aerospace, health, and various other fields. In the components of a vehicle, the components that have the most potential to be reduced are the main structural components, namely the floor, body, and ribs. Efforts to reduce the weight of the material in these components are carried out to reduce the amount of fuel consumption, so the ratio of strength and density of a material is one of the important properties that needs to be considered. This study used the hand lay up method with a comparison of volume fraction variations of 15%: 85% and 20%: 80%. With the aim of adding volume fractions with optimal combinations, it is hoped that the tensile strength will get better. The highest average tensile strength is with a volume fraction ratio of 15%: 85% of 19.04 MPa. While the lowest average tensile strength is with a volume fraction ratio of 20%: 80% of 17.78 MPa. It can be concluded that with increasing fiber volume fraction, the tensile strength decreases. This happens because there are several defects in the form of holes and voids which indicate poor bonding between the fibers and the matrix. Keywords: PRG sugarcane fibers, volume fraction, epoxy, tensile properties
DESIGN AND PROTOTYPING OF ELECTRIC CARRYING TRACTORS Rizayana, Farid; Kwintarini, Widiyanti; Hermawan, Muhammad Reza; Bayuseno, Athanasius P; Jamari, Jamari
ROTOR Vol 16 No 2 (2023)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v16i2.43816

Abstract

Locations with hard-to-reach access make people living in 3T (Terluar/Front, Terpencil/Remote, Terbelakang/Backward) areas unable to enjoy quality fuel oil (BBM) at affordable prices. This research provides solutions for people in remote areas and communities in the 3T area to utilize agricultural equipment without dependence on fuel. The agricultural equipment in question is a Multifunctional Portable Tractor driven by an electric motor, using a battery. Batteries are recharged from solar sources through solar panels, water turbines and wind turbines. The research method used adopts the "Walter Franco" method (Franco et al., 2020). Product design and development involved 3 farmer groups from 3 different regions in West Java and six small machinery component industries in West Java, Indonesia. Research methodology involves the use of observations and field testing prototypes as instruments. This research resulted in innovative equipment that can be used for sloping land farming. This equipment is the only mechanical agricultural equipment that can be folded and carried by one person, so its contribution to research in inclined land farming is very large. This equipment is proven to cultivate land on sloping land profitably, so its contribution to farmers in Indonesia and other countries will be very significant Keywords: Carrying tractor, Electric drive, 3T, Sloping land, Agricultural mechanization
ANALYSIS OF NON-DESTRUCTIVE TESTING IN THE METAL STITCHING PROCESS Saputra, Ryandi Daffa; Zariatin, Dede Lia
ROTOR Vol. 17 No. 1 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i1.43300

Abstract

This research addresses damage and cracks in the Yanmar 6N18L – EV engine block through metal stitching, a coldwelding method using pins and locks to prevent thermal and mechanical cracks. The study aims to assess crack quality post metal stitching via NDT Liquid Penetrant and hardness through NDT Hardness Testing. Economic value is also evaluated. Data is collected through field observation and experimentation, meeting ASTM 159 G3500 standards. Results indicate successful crack repair, meeting NDT Liquid Penetrant standards, and achieving a 230.6 HB average hardness with a 4.82% variance, aligning with ASTM 159 G3500's 207-255 HB range. Economically, metal stitching proves beneficial with an NPW of Rp 412,353,912, making it a preferred solution for engine block crack issues.
THE EFFECT OF ENGINE NOISE ON CADETS AT THE INDONESIAN AVIATION ACADEMY VOCATIONAL SCHOOL BANYUWANGI Prayitno, Hadi; Putra, Dimas Endrawan; Rumani, Daniel D; Rusdiyansyah, Arief; Anam, Muhamad Khoirul
ROTOR Vol 16 No 2 (2023)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v16i2.43137

Abstract

Noise is a sound that causes sound violence and disturbs humans. In the aviation industry, noise affects flight safety and success because it can interfere with the concentration and performance of flight cadets. In addition, high intensity can also cause stress and fatigue in flight cadets, reducing their ability to maintain focus and respond to critical situations. This study aimed to analyze the impact of noise produced by engine sounds and radio signals on pilots. The results of this study on the aircraft dashbord sound noise value is greater because the aircraft dashbord clan is located adjacent to the engine while the smallest noise value is found in data retrieval in the back seat because it is farther from the engine. The data collection carried out produces output in the form of data resulting from the effect of engine noise on cadets. Keywords: noise,cadets,engine sound
EFFECT OF WELDING SEQUENCE ON DISTORTION RESULTS IN BRACKET CONNECTIONS Suheri, Suheri; Widodo, Syamsul Bahri; Arif, Zainal; Surawan, Surawan; Ali, Sulaiman; Pamungkas, Nurman; Syafii, Muhamad
ROTOR Vol. 17 No. 1 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i1.49037

Abstract

The distortion in the shape of the weld specimen is influenced by the uneven heat distribution during the welding process. There is also distortion in the welding modeling performed on the bracket joint. The modeling scenario of the bracket joint forms the basis for measuring the distortion results. Therefore, when we model the bracket joint, we obtain varying distortion results. There are three lines to observe the distortion effects. Lines a, b, and c are located on the X and Y axes (center), while line c is on the X and Y axes (+). Line a is on the X and Y axes (-). The test specimen that has been modeled is the result of numerical modeling, which is then used to calculate the magnitude of the distortion on the longitudinally stiffened plate test specimen. For the numerical modeling of the bracket joint, the result of scenario 1 is distortion. Meanwhile, the distortion results of the bracket joint modeling in scenarios 1 and 2 show that the distortion value obtained in scenario 2 is higher than that obtained in scenario 1. This is influenced by the order of welding lines used in the bracket joint modeling.
THE ANALYSIS THERMAL CONDUCTIVITY OF PINEAPPLE FIBER COMPOSITES EPOXY AND NA2SIO3 AS CAR LIGHT SOCKET MATERIALS Saputra, Eka Bima; Fachriza, Andry; Prabowo, Bambang; Hartono, Bibit
ROTOR Vol 16 No 2 (2023)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v16i2.37395

Abstract

Along with the increasing number of motorized vehicles and the massive renewal of it, their lifetime has become faster, especially for cars. The problem often occurs in cars that have passed their lifetime is a lighting system, one of which is that the car's light socket often melts. Car headlight sockets made of plastic and rubber which function as seals cause the socket to melt when exposed to heat. Based on the existing problems, the purpose of this research is to find new material for making car light sockets using the standard hot wire method. The production begins with mixing epoxy resin with hardener using the hand lay-up method with a ratio of 2:1. Stir mixture for 5 minutes and add the pineapple into molds (110x60x20) mm and wait for a day at room temperature. Furthermore, the thermal conductivity test using QTM-500 tester. Based on the research results, all specimens suitable for the requirements use as materials for making car light sockets, because the thermal conductivity values of all specimens (0.2231, 0.2061, 0.2249) W/mK were below the thermal conductivity values of the previous socket-making materials, 0.23 W/mK. The best specimen composition is specimen 1 with thermal conductivity value of 0.2231 W/mK. This is because specimen 1 has little porosity or voids and small conductivity value. Thus, the composition ratio that is best used in the manufacture of car light sockets based on the total mass of resin, hardener, pineapple fiber, and sodium silica is 15: 7.5: 1: 3.75. Keywords: composite, pineapple fiber, thermal conductivity, socket, catalyst
ANALYSIS OF CAVITATION LEVEL IN WADASLINTANG HYDROPOWER PLANT USING THOMA CAVITATION FACTOR Prasetyo, Budi; Saputra, Trisma Jaya; Fajarningrum, Nurmala Dyah
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.v17i2.53593

Abstract

Turbine damage can be caused by several causes, including damage to the turbine due to cavitation on the surface of its blades. Miscalculation of the position or location of the turbine can occur and will result in this cavitation. The Thoma cavitation factor is used to determine whether the turbine operation is safe from cavitation. This research was conducted at the Wadaslintang Hydroelectric Power Plant. The research used a quantitative descriptive research method. This study aims to determine the level of cavitation that occurs in the Francis turbine at an actual reservoir elevation of 169.23 meters above sea level with maximum guide vane openings to minimum guide vane openings. At variations in guide vane openings of 100% and 80% cavitation occurs, while at guide vane openings of 76%, 60%, 40%, and 20% cavitation does not occur. The larger the guide vane opening, the cavitation level is in a more dangerous condition because the difference between the cavitation factor and the critical cavitation factor is smaller, with the difference values ​​of 1.285073, 1.023435, 0.970782, 0.763080, 0.506127, and 0.253081, respectively. The smaller the guide vane opening, the smaller the risk of cavitation, but the power generated is also smaller. Safe operating conditions from cavitation with the greatest power are found at a guide vane opening of 76%-80%. Keywords: francis turbine, guide vane, cavitation, thoma cavitation factor.
THE EFFECT OF ADDITION OF BLACK TIN (Pb) IN BRONZE ALLOYS WITH HIGH TIN CONTENT ON IMPACT STRENGTH AND MICROSTRUCTURE Fahrezi, Michael
ROTOR Vol. 18 No. 1 (2025)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

High-tin bronze (CuSn), especially with tin content above 17%, is commonly used in industries for making gamelan and bells due to its excellent acoustic properties. However, this alloy has drawbacks such as high cost and brittleness, which can cause cracking during forging and use. This study investigates the effect of adding lead (Pb) on the impact strength and microstructure of high-tin bronze alloys. Lead was chosen because it is cheaper than tin, helps reduce porosity, and can improve mechanical properties. Variations of Pb added were 5%, 10%, and 15%. The impact strength was tested using the Charpy impact test, and the microstructure was examined with a metallurgical microscope. Results showed that adding Pb improved the impact strength, with the composition of 80% Cu, 20% Sn, and 10% Pb achieving the highest impact strength of 0.0274 Joule/mm², compared to 0.0164 Joule/mm² in the pure alloy. The 10% Pb addition also created a uniform Pb distribution. However, adding more than 10% Pb reduced the impact strength, making the alloy less optimal. Therefore, 10% Pb provided the best balance between mechanical performance and microstructure. Keywords: Copper (Cu), white tin (Sn), lead (Pb), impact, microstructure
THE EFFECT OF MIG WELDING CURRENT VARIATIONS ON THE HARDNESS AND MICRO-STRUCTURE TESTS OF ST 37 STEEL Triyoko Budi Wibowo
ROTOR Vol. 18 No. 1 (2025)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the effect of welding current variations on the hardness and microstructure of ST 37 steel using Metal Inert Gas (MIG) welding. The experimental method was applied, where three current variations (100 A, 110 A, and 120 A) were used to weld ST 37 steel specimens. The specimens were then tested for hardness using the Vickers hardness test and examined for microstructural changes using an optical microscope. The results show that higher welding currents increase hardness, with the highest Vickers hardness value recorded in the heat-affected zone (HAZ) at 120 A (399.56 VHN). Microstructural analysis revealed the presence of ferrite and pearlite phases, with a higher pearlite fraction in the weld metal and HAZ, leading to increased hardness. This study provides insight into optimizing welding parameters to enhance the mechanical properties of welded steel structures. Keywords: MIG welding, welding current, hardness test, ST 37 steel, microstructure
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

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