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All Journal CIVED (Journal of Civil Engineering and Vocational Education) Mechanical Engineering Education Journal Sainstek JURNAL PENDIDIKAN TAMBUSAI JOURNAL OF SCIENCE AND SOCIAL RESEARCH Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Fokus Elektroda : Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali Journal of Applied Engineering and Technological Science (JAETS) MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Didaktik : Jurnal Ilmiah PGSD STKIP Subang Teknomekanik Fokus Elektroda: Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali) Jurnal Vokasi Mekanika Tsaqofah: Jurnal Penelitian Guru Indonesia MASALIQ: Jurnal Pendidikan dan Sains Fleksibel: Jurnal Pengabdian Kepada Masyarakat Journal of Engineering Researcher and Lecturer Journal of Innovative and Creativity IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Journal of Civil Engineering and Vocational Education Mars: Jurnal Teknik Mesin, Industri, Elektro dan Ilmu Komputer
Yolli Fernanda
Universitas Negeri Padang
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Transportation Other

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Analisis Kekuatan Material Mata Potong pada Mesin Pemipil Jagung Multifungsi Firdaus, Muhammad; Fernanda, Yolli
TSAQOFAH Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i6.7215

Abstract

This study aims to evaluate the effect of heat treatment on the hardness of ST 37 steel, analyze the structural strength of a cutting blade using Finite Element Analysis (FEA) on AISI 1045 material, and test the functional performance of a corn sheller machine under varying rotational speeds. Vickers hardness testing (ASTM E18) revealed that tempering at 250°C for one hour increased the hardness of ST 37 steel from 138.3 VHN to 285.1 VHN, accompanied by a reduction in indentation diameter from 0.658 mm to 0.317 mm. Static simulation using SolidWorks showed a maximum von Mises stress of 0.05928 MPa, significantly below the AISI 1045 yield strength of 530 MPa. The maximum displacement was recorded at 1.16×10⁻⁵ mm, with a Factor of Safety (FoS) of 8,940.2, indicating that the material is highly safe for use. Functional testing of the machine showed that increasing the rotational speed from 380 rpm to 1200 rpm significantly improved the working capacity from 503.3 kg/hour to 828.5 kg/hour, with shelling efficiency rising from 88.08% to 98.05%. Overall, this study provides a scientific basis for material selection and blade design development to enhance the performance and reliability of corn sheller machines in the agricultural sector.
Karakteristik Turbin Archimedes pada Ketinggian Air Rendah dan Kemiringan 45° Ikhsan, Ghufra; Fernanda, Yolli; Karudin, Arwizet; Primawati, Primawati
TSAQOFAH Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i6.7263

Abstract

Turbines are a key component in hydroelectric power generation, including the Archimedes Screw type, which is specifically designed to operate under low head and low water discharge conditions. This study aims to calculate the rotational speed of the Archimedes Screw turbine under varying water discharge rates, analyze the effect of discharge on turbine rotation, and compute and evaluate the turbine’s efficiency. A quantitative experimental approach was employed, with data obtained through direct testing of a designed Archimedes Screw turbine prototype. Research instruments included measurements of turbine rotational speed and the generated electrical power. Tests were conducted three times at a 45° inclination angle. The results showed that the actual power (Pactual) generated was 11.95 Watts in the first trial, 10.96 Watts in the second, and 12.56 Watts in the third. These findings indicate variations in power output influenced by water discharge and demonstrate the potential of the Archimedes Screw turbine as a micro-hydro energy solution for low-flow water sources. The study concludes that optimizing design and operational parameters is essential for improving the efficiency of such power generation systems.
Experimental study on the use of wood pellet briquettes in rocket stoves for household energy needs Rafki Irianto; Yolli Fernanda; Primawati Primawati; Dori Yuvenda
Journal of Engineering Researcher and Lecturer Vol. 5 No. 1 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i1.206

Abstract

This experimental study investigates the effect of air supply configurations on the combustion performance and thermal efficiency of wood pellet briquettes in rocket stoves for household energy use. With increasing global demand for energy and the depletion of fossil fuels, the shift to renewable biomass fuels, such as wood pellets, is essential to reduce carbon emissions and enhance energy efficiency. The study evaluates four airflow configurations: right fan only (F3), lower-left + right fans (F2+F3), two left fans (F1+F2), and all fans (F1+F2+F3). The results show that the F3 configuration achieved the fastest boiling time, highest boiling temperature, and lowest heat-loss temperature, indicating superior thermal performance. In contrast, configurations with higher airflow (F1+F2 and all fans) led to greater heat losses and slower boiling times, suggesting that excessive airflow can negatively affect efficiency. Additionally, the analysis of residual mass revealed that F3 and F2+F3 configurations produced the lowest residuals, indicating more complete combustion. This study provides important insights into optimising airflow configurations to improve the efficiency of biomass stoves. The findings offer practical implications for the design and operation of sustainable cooking technologies, promoting energy efficiency and reducing reliance on fossil fuels in households, particularly in rural areas.
Analisis Kekuatan Struktur Rangka Alat Uji Konduktivitas Termal Berbasis Metode Elemen Hingga Firman Firman; Yolli Fernanda
MASALIQ Vol 6 No 2 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9121

Abstract

Although thermal conductivity test apparatuses have been widely used to characterize the heat transfer properties of materials, studies that specifically address the strength of their supporting frame structures remain limited. In testing practice, the frame of the apparatus is subjected not only to thermal loads but also to mechanical loads arising from the weight of components and clamping forces, so an inadequate structure may experience excessive deformation, reduce measurement accuracy, and shorten the service life of the apparatus. This study aimed to analyze the strength and stiffness of the frame structure of a thermal conductivity test apparatus based on the Comparative Cut-Bar Method using the Finite Element Method (FEM). A quantitative approach was employed through numerical simulation using ANSYS Workbench 2025. The frame geometry was designed in SolidWorks with low-carbon steel AISI 1010 as the material, followed by static structural analysis with fixed support boundary conditions and loading variations of 135 N, 145 N, and 155 N, representing the operating conditions of the test apparatus. The analyzed parameters included total deformation and equivalent stress. The simulation results showed that maximum deformation occurred at the central support seat of the frame, with values ranging from 0.000000089501 mm to 0.00000010276 mm, which are very small and do not affect the stability or functionality of the apparatus. The maximum equivalent stress ranged from 0.00583 MPa to 0.0066975 MPa, far below the elastic limit of AISI 1010 steel of 305 MPa. These findings indicate that the frame structure of the thermal conductivity test apparatus has very good strength and stiffness and is safe to use under the analyzed operating conditions. This study provides a basis for structural evaluation and a design reference for the frame of thermal conductivity test apparatuses to support measurement reliability and long-term use.
Effect of Hydrophobic Surface on Thermoelectric Cooling-Based Atmospheric Water Generator Abdillah Irfan; Andre Kurniawan; Arwizet K; Yolli Fernanda
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 2 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i2.843

Abstract

Water has a very important role in everyday life. Apart from humans, other living things also depend on water to survive. But there are still many areas in the world even in Indonesia still experiencing drought or clean water crisis. Therefore, new innovations are needed in producing water. One of the innovations is the atmospheric water generator (AWG) which utilizes the formation of water from air or condensation. The AWG in this research uses thermoelectricity as a cold source. Where thermoelectricity is less noisy, easy to obtain and assemble into a system, has a long service life without requiring maintenance. But thermoelectrics have disadvantages where cooling on thermoelectrics is less efficient. So to overcome this, I as the author use a hydrophobic surface as a condensation surface where it can accelerate condensation and increase the amount of water produced. In this study to see the comparison, tests were carried out using various types and surface areas.
Solar Home System Plant Menggunakan Gabungan Dari DVD dan Solar Panel Kresna Adi Prasetya; Arwizet K; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 2 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i2.860

Abstract

Indonesia is a tropical country that has great potential for harnessing and managing solar energy. At present, the technology of converting solar energy into electrical energy such as solar cells still has weaknesses in terms of cost. Therefore, this study aims to test the potential of solar energy by creating a solar home system plant using DVD and Zener diode. This solar home system plant using DVD has the advantage of using low cost and the power generated can be said to be sufficient. In addition, this product can be used as a substitute for solar cells if properly applied. This study uses an experimental method in a quantitative approach. In this study, the independent variable is the structure of the solar panel while the dependent variable is the amount of energy read by the voltmeter. This study uses the photoelectric principle. Where photoelectricity is an electron released from the surface of an object exposed to light. This study was carried out by looking at how much power could be generated by DVD and Zener diode. The results showed that DVD and Zener diode can generate electrical energy, but the results are still too small and a large number of DVDs are needed to generate more energy. So it can be concluded that DVD still cannot replace solar panels, but can be used as a tool to maintain the stability of solar panels.
Analysis of the Effect of Bottom Blade Inclination Angle Variations on Torque in Vortex Turbines Using Computational Fluid Dynamics (CFD) Badri Kurniawan; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i3.887

Abstract

The development of renewable energy in Indonesia is a strategic effort to meet increasing energy demands while reducing dependence on fossil fuels. One promising approach is utilizing river flow for micro-hydro power generation, particularly with vortex turbines that operate efficiently under low head and discharge conditions. This study aims to analyze the effect of varying bottom blade inclination angles on the torque generated by a vortex turbine using Computational Fluid Dynamics (CFD) simulations. The research employed ANSYS Fluent with a k-? SST turbulence model and used a three-dimensional numerical method to evaluate three inclination angles: 22.5°, 32°, and 42°. The results show that blade inclination significantly influences torque values, with the 22.5° angle producing the highest torque of 10.95 Nm, followed by 32° at 10.79 Nm, and 42° at 10.58 Nm. These findings indicate that optimizing blade inclination improves turbine performance, contributing to the development of efficient micro-hydro systems for renewable energy applications.
Analisis LMTD dan Efektivitas terhadap Kinerja Pendinginan pada Desain Motor BLDC 5 kW Tipe Fluks Aksial Magnet Permanen Menggunakan Simulasi CFD Riezky Hidayattullah; Dori Yuvenda; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 4 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i4.908

Abstract

Axial flux type BLDC motors primary issue is the high operating temperature of the stator and winding components, which can lower system efficiency and hasten the deterioration of the quality of the insulation material. This study is to examine the effects of geometric alterations to the cooling system, such as axial fins on the housing side and curved fins on the casing, on the temperature distribution of a 5-kW axial flux permanent magnet BLDC motor. Convection and conduction heat transport in the cooling system were modeled using ANSYS Fluent software and computational fluid dynamics (CFD) simulation techniques. The Log Mean Temperature Difference (LMTD) and the cooling design's relative efficacy in comparison to the baseline state are the primary metrics that are examined. According to the simulation results, the maximum winding temperature may be lowered to 311 K and the cooling distribution in the rotor, casing, and housing can be improved by adopting curved fin casing and axial fin housing. As the temperature differential between the coolant and the motor surface narrows, the LMTD value drops from the initial condition (5.10 K to 13.94 K), suggesting a more effective heat transfer process. Furthermore, the cooling system's efficiency has more than doubled since its original design. Overall, the study's findings demonstrate that enhancing the cooler's geometric design can increase the BLDC motor's thermal performance and prolong component life.
Analysis Of The Effect Of Penstock Diameter Variation And Nozzle Flow Velocity On Pelton Turbine Performance Using Computational Fluid Dynamics (CFD) Revaldo Nur Hidayat; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 2 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/18k9e415

Abstract

The performance of a Pelton turbine in micro-hydropower plants is influenced by penstock design and fluid flow conditions. Variations in penstock diameter can lead to changes in head loss, flow velocity, and energy transfer efficiency. This study aims to analyze the effect of penstock diameter variation and nozzle flow velocity on Pelton turbine performance under different head conditions using the Computational Fluid Dynamics (CFD) method.Simulations were conducted using penstock diameters of 4 inches, 5 inches, and 6 inches with ANSYS software. The results show that the respective head losses are 0.010 m, 0.006 m, and 0.0028 m, indicating that larger diameters reduce friction losses in the flow. The corresponding nozzle velocities are 8.90 m/s, 9.08 m/s, and 8.64 m/s, with the highest value observed at the 5-inch diameter due to the balance between flow rate and energy losses. The resulting torque values are 2.13 Nm, 2.55 Nm, and 2.60 Nm, while the rotor rotational speeds are 150.87 W, 189.07 W, and 194.90 W. The effective power generated is 65.59 W, 80.21 W, and 77.79 W, with efficiencies of 43.77%, 42.44%, and 39.95%, respectively. The results indicate that a 5-inch penstock diameter provides the most optimal performance, as it achieves the best balance between head loss, flow distribution, and fluid energy transfer.
Enhanced durability and tribological performance of polyvinyl alcohol/layered double hydroxide/tannic acid composites under repeated swelling cycles Dieter Rahmadiawan; Shih-Chen Shi; Wei-Ting Zhuang; Eko Indrawan; Yolli Fernanda; Budi Syahri; Irzal Irzal
Teknomekanik Vol. 7 No. 2 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v7i2.32872

Abstract

In recent years, the exploration of polyvinyl alcohol (PVA) composites has garnered significant attention due to their versatility applications in aqueous environments. However, despite their promise, neat PVA exhibit limitations such as significant mechanical degradation under repeated swelling cycles. This study investigates the durability and tribological performance of polyvinyl alcohol (PVA) composites reinforced with nickel-iron layered double hydroxide (LDH) and tannic acid (TA) under repeated swelling cycles. Building on previous research that explored composite preparation and initial characterization, this research emphasizes the effects of cyclic swelling on wear resistance, friction behavior, and mechanical properties. Tribological tests were conducted to evaluate the coefficient of friction (COF) and wear rate before and after multiple swelling cycles, alongside tensile strength and strain measurements. The results revealed that the PVA/TA2/LDH2 composite, containing the highest additive content, exhibited the lowest wear rate of 11.52 × 10⁻⁵ mm³/Nm after 3 swelling cycles, demonstrating superior resistance to material degradation. Although PVA/TA2/LDH1 exhibited a slightly lower COF, its wear rate was higher due to reduced reinforcement. Compared to neat PVA, which showed a COF increase from 0.45 to 0.53, the PVA/LDH/TA composites retained their tribological stability, with only a marginal increase in COF and wear rate. Similarly, tensile strength of PVA/TA2/LDH2 decreased by only 11% after 3 cycles (from 33.3 MPa to 30 MPa), while neat PVA experienced a 25.5% reduction (from 30 MPa to 22.5 MPa). These findings highlight the potential of PVA/LDH/TA composites for applications in aqueous environments, offering significantly enhanced long-term performance and reliability.
Co-Authors - Primawati A, Yufrizal Abdillah Irfan Abdu Idham Adam Mandra Suwandi Afdal Faisal Ahmed, Shabir Akbar, Arifki Akhmad Rais Ambiyar, Ambiyar Aminuyati Andika Putra ANDIKA SAPUTRA Andre Kurniawan Andre Kurniawan Andri, Junil Arafat, Andril Arwizet Arwizet Arwizet Arwizet, Arwizet Arwizet K Arwizet. K Asadellah, Dimas Pandhu Ashekul Islam Azis, Ismail Badri Kurniawan Budi Syahri Budi Syahri Delima Yanti Sari Desyandri Desyandri Devky Meinaldi Fernanda Dieter Rahmadiawan Diki Afrianto Dimas Pandhu Asadellah Dionova, Aldi Dori Yuvenda Durain Parmanoan Dwi Sakti Putra DWI SURYANTO Egis Egis Eko Indrawan Elvira Zondra, Elvira Erizon, Nelvi Fadhilah Fadhilah Fadli Ramadhan Fadri, Muhammad Al Fahrendra, Aqsal Fajar Surya Farhan Rahmat Putra Fathi Aulia DZ Febri Prasetya Felia Maresta Fido Delfri Tamasya Firma Yulianis Firman Firman Fitrah Qalbina Fitri Amelia Fonny Maswija Priscilla Fretina Sari Hadi, Farhan Handayani, Meisuri Handrianto Handrianto Haris Yuliardiansyah Ikhsan, Ghufra Irlido Irwansyah Irzal Irzal Irzal, Irzal Jasman Jasman Kandena Putra, Tegar Kiwata, Takahiro Kresna Adi Prasetya La Ode Ahmad Barata M Chalid Kurnia M. Ilham Anugrah Illahi Mega Oktaviani Mochammad Haikal Muhammad Akhbar Muhammad Al Fadri Muhammad Bayu Septian Muhammad Fadil Al Rahman Muhammad Firdaus Muhammad Ihsan Muhammad Iqbal Muhammad Raihan Muhammad Ravi Albasyit Muhammad Riski Hidayat Muhammad Shiddiq Muhammad, Maghfiridhani Mulianti Nasution, Ridhollah Nelvi Erizon Nurdin Hendri Nurwijayanti Pratomo, Muhammad Agung Primawati Primawati, Primawati Purwantono Purwantono Purwantono, Purwantono Putra, Kevinda Putra, Randi Purnama Rafki Irianto Rahmadiawan, Dieter Randi Purnama Putra Rano Hanif Refdinal Refdinal, Refdinal Refdinal, Refdinal Refitra Irawan Remon Lapisa Revaldo Nur Hidayat Rezki Alhakim Ridhatul Arif Ridhollah Nasution Riezky Hidayattullah Rifelino Rifelino Riki Saputra Riky Satria Rizki Agustian Rizki Ramadhan Nasution, Muhammad Robby, Muhammad Rudy Anarta Salmat Salmat Salmat, Salmat Seprianto, Ekon Sherly Rahmayani Shi, Shih-Chen Shih-Chen Shi Sri Riski Putri Primandari Sri Rizki Putri Primandari Syahril Syahril Syaiful Salim Teki Haryono Toto Sugiarto Usin Usin Waskito Wei-Ting Zhuang Willy Vernando Yoga Rizki Ananda Yovindra, Difa Yufrizal Yufrizal Yusmaita, Eka Zainal Abadi Zhuang, Wei-Ting Zulvani Adha