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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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Implementation of experiential learning method in mechanical drawing course to enhance student understanding through real projects Ridhollah Nasution; Arwizet K; Yolli Fernanda
Journal of Engineering Researcher and Lecturer Vol. 3 No. 2 (2024): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v3i2.127

Abstract

This research explores the implementation of experiential learning to improve students' understanding and skills in mechanical drawing using CAD software. We used this approach to identify challenges in learning mechanical engineering, including lack of time to learn CAD, suboptimal mechanical drawing skills, and limitations in producing details of mechanical components. Through a quasi-experiment with experimental and control classes, we measured the impact of the experiential learning method on improving conceptual understanding and practical skills in mechanical drawing. The results show that this approach is effective in improving students' understanding of detailed drawings and practical skills. The implementation of Experiential Learning also improved students' cognitive learning outcomes and psychomotor skills in mechanical drawing. The findings highlight the importance of adaptive and technological approaches to engineering education that are aligned with modern industry needs.
The Influence of Fuel Injection Pressure on Engine Performance and Smoke Emissions in a Diesel Engine Using Palm Oil Biodiesel Blend Fuel Irlido Irwansyah; Dori Yuvenda; Yolli Fernanda; Durain Parmanoan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sqkbmp02

Abstract

This study was conducted to examine the effect of fuel injection pressure variations on diesel engine performance and Smoke Emissions in Yanmar TF105MR-DI diesel engines using B50 palm oil biodiesel mixture. The test was conducted at injection pressures of 210, 220, 230, and 240 kg/cm² with load variations of 1000, 2000, 3000, and 4000 W. Parameters observed included power, torque, Specific Fuel Consumption (SFC), thermal efficiency, and exhaust gas turbidity level as indicators of Smoke Emissions. The test results show that the change in injection pressure has an effect on the combustion process and the performance characteristics of the engine. An increase in injection pressure to 230 kg/cm² is able to improve the fuel atomization process so that the formation of the air-fuel mixture becomes more homogeneous. This results in higher power and torque than other pressure variations, along with a decrease in SFC values and increased thermal efficiency at all levels of load. However, when the injection pressure is increased to 240 kg/cm², the performance of the engine tends to decrease. This is suspected to be caused by the penetration of the fuel spray too far so that the mixing and combustion process does not take place optimally. In terms of emissions, a more optimal injection pressure also contributes to a reduction in the turbidity level of exhaust fumes. 
Analysis of Energy Supply Substitution from a Diesel Power Plant System to a Solar Power Plant System Based on Capacity Design for the Office Load of PT XYZ in Karimun Regency, Indonesia Muhammad Iqbal; Andre Kurniawan; Arwizet K; Yolli Fernanda
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cz0ekp13

Abstract

The dependence of the office load at PT XYZ on Diesel Power Plants (DPPs) in a mini-grid electricity system creates the need for an alternative energy supply that is more efficient, reliable, and compatible with local solar potential. The present study aims to design and analyze the performance of a battery-based off-grid Solar Photovoltaic Power Plant (SPP) to independently supply office electricity demand by considering the load profile, photovoltaic module configuration, controller/MPPT converter, battery capacity, module orientation, and system losses. The method consists of daily load profile analysis, the use of Meteonorm meteorological data for the Sungailimau site, fixed module orientation with a tilt angle of 5° and an azimuth of 0°, and stand-alone system simulation using PVsyst V8.1.2. The proposed system consists of 200 Longi Solar modules rated at 560 Wp, with a total installed capacity of 112 kWp, The solar power system is designed in a modular configuration consisting of 4 PV blocks. Each block consists of 5 strings connected in parallel, with each string comprising 10 PV modules connected in series. The total system configuration consists of 20 strings., an MPPT converter-based controller, and a BYD Box Premium HVM 22.1 lithium-ion LFP battery storage system with 368,6 kWh of stored energy. The simulation results show 105.989 kWh/year of useful solar energy, 151.191 kWh/year of available solar energy, 49.213 kWh/year of unused energy, a performance ratio of 56,64%, a solar fraction of approximately 92,33%, and 1.856 kWh/year missing energy. 
Actual Performance Analysis of a Rankine Back Pressure System on a 1600 kW Turbine-Generator Unit at PT Kencana Sawit Indonesia Using Python Programming Muhammad Bayu Septian; Arwizet K; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/x2phe139

Abstract

The Palm oil mills require steam systems that can supply electricity and process heat at the same time. This study analyzes the actual performance of a Rankine back pressure system on a 1600 kW turbine-generator unit at PT Kencana Sawit Indonesia using Python programming. The study used field documentation, equipment nameplate data, turbine-generator logsheet data, and an assumed steam flow scenario of 21.0-26.0 ton/h because the boiler steam flow indicator was reported to show an over-range condition. The analysis was carried out by converting actual operating data into thermodynamic performance parameters, including generator load, steam rate, turbine efficiency estimation, power-only efficiency, and energy utilization tendency. The results show that the unit operated under partial load with an average generator output of 715.19 kW or about 44.70% of the 1600 kW nominal capacity. The average steam rate increased from 32.99 kg/kWh at 21.0 ton/h to 40.85 kg/kWh at 26.0 ton/h. The estimated turbine efficiency decreased from 43.45% to 35.10% as the assumed steam flow increased. The power-only efficiency remained low because the exhaust steam was not discharged as waste heat, but was used as process steam in the back pressure system. Python-based processing provides a transparent and repeatable approach for evaluating field logsheet data.
Analysis of Building Electrical Energy Consumption and Energy Saving Potential Using e-Quest Simulation with the Energy Efficiency Measures Method Rano Hanif; Arwizet K; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pk0n4n16

Abstract

This study presents a preliminary electrical energy audit of the Health Office Building of West Sumatra Province, aiming to determine the building's Energy Consumption Intensity (ECI), map the distribution of electrical loads, and identify Energy Efficiency Measures (EEM) through e-Quest building energy simulation. A descriptive-quantitative method was applied following the SNI 6196:2011 energy audit procedure and the ECI standard of Ministerial Regulation of Energy and Mineral Resources (ESDM) No. 13 of 2012. Primary data were obtained from direct field measurement of voltage, current, and power factor using a watt meter across 22 rooms on two floors (1,360 m2), supplemented by 12 months of PLN electricity billing data as secondary data. Building simulation was performed in the e-Quest Quick Energy Simulation Tool using Activity Area, Lighting, and Plug Loads parameters derived from the field measurements. The manual calculation yielded a total consumption of 78,337.13 kWh/year, corresponding to an ECI of 57.60 kWh/m2/year, validated against PLN billing data with a deviation of only 5.00%, placing the building in the "Very Efficient" category (threshold < 102 kWh/m2/year). Air-conditioning (AC) dominates consumption at 89.21%, far exceeding other equipment (6.65%) and lighting (4.14%). The e-Quest model produced 88,640 kWh/year, deviating 7.76% from PLN data. Among three EEM scenarios tested, AC-inverter retrofit yielded the largest saving (37.20%), followed by AC set-point adjustment from 22°C to 23°C (5.08%), while LED lighting retrofit produced the smallest saving (1.47%). These findings indicate that energy-conservation priorities should be directed primarily toward the air-conditioning system.
ANALISIS KINERJA TURBIN AIR VERTIKAL TIPE S-SHAPE PADA SALURAN MELENGKUNG MENGGUNAKAN COMPUTATIONAL FLUID DYNAMICS (CFD) Dimas Pandhu Asadellah; Fitrah Qalbina; Yolli Fernanda; Randi Purnama Putra
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol. 9 No. 1 (2026): February 2026
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v9i1.5793

Abstract

Abstract: The s-shaped turbine is a hydrokinetic turbine that has the potential to be applied to open channel flows due to its ability to operate at low flow velocities and its simple construction. However, the performance of this turbine is greatly influenced by the surrounding hydrodynamic conditions, including the geometry of the flow domain. This study aims to analyze the effect of variations in the open channel domain angle on the flow characteristics and performance of the s-shaped Savonius turbine using a Computational Fluid Dynamics (CFD) approach. Simulations were carried out at three variations of domain angles, namely 20°, 30°, and 40°, with an inlet flow velocity of 0.5 m/s, a turbine diameter of 76 mm, and a turbine height of 76 mm. The performance parameters analyzed included torque, power coefficient (Cp), and torque coefficient (Ct), as well as flow characteristics in the form of velocity contours, pressure contours, and streamlines. The simulation results show that variations in the domain angle have a significant effect on the flow distribution, pressure pattern, and torque stability produced by the turbine. The domain with an angle of 20° produces the highest Cp and Ct values, while the 30° domain shows a significant decrease in performance due to the increase in the recirculation zone and pressure imbalance around the rotor. Keyword: S-Shape Turbine; Hydrokinetics; Open Channel; CFD; Domain Angle Abstrak: Turbin tipe s-shape merupakan salah satu turbin hidrokinetik yang potensial untuk diaplikasikan pada aliran saluran terbuka karena kemampuannya beroperasi pada kecepatan aliran rendah dan konstruksinya yang sederhana. Namun, kinerja turbin ini sangat dipengaruhi oleh kondisi hidrodinamika di sekitarnya, termasuk geometri domain aliran. Penelitian ini bertujuan untuk menganalisis pengaruh variasi sudut domain saluran terbuka terhadap karakteristik aliran dan performa turbin s-shape menggunakan pendekatan Computational Fluid Dynamics (CFD). Simulasi dilakukan pada tiga variasi sudut domain, yaitu 20°, 30°, dan 40°, dengan kecepatan aliran masuk 0,5 m/s, diameter turbin 76 mm, dan tinggi turbin 76 mm. Parameter kinerja yang dianalisis meliputi torsi, koefisien daya (Cp), dan koefisien torsi (Ct), serta karakteristik aliran berupa kontur kecepatan, kontur tekanan, dan streamline. Hasil simulasi menunjukkan bahwa variasi sudut domain memberikan pengaruh signifikan terhadap distribusi aliran, pola tekanan, dan stabilitas torsi yang dihasilkan turbin. Domain dengan sudut 20° menghasilkan nilai Cp dan Ct tertinggi, sedangkan domain 30° menunjukkan penurunan kinerja yang cukup signifikan akibat meningkatnya zona resirkulasi dan ketidakseimbangan tekanan di sekitar rotor. Kata kunci: Turbin S-Shape; Hidrokinetik; Saluran Terbuka; CFD; Sudut Domain
Analisis Aerodinamika Rancangan Body City Car dengan Penambahan Spoiler Belakang Menggunakan Ansys Fluent Yoga Rizki Ananda; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
MASALIQ Vol 5 No 2 (2025): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i2.4976

Abstract

An increase in the number of fossil fuel vehicles leads to increased energy consumption and exhaust emissions, which have a negative impact on the environment. One way to improve fuel efficiency is to optimize vehicle aerodynamic design, especially through the addition of a rear spoiler. This study aims to analyze the effect of city car body design with the addition of a rear spoiler on vehicle aerodynamic characteristics, such as drag coefficient, lift coefficient, and the ratio between the two. The research method used is numerical simulation with Computational Fluid Dynamics (CFD) using Ansys Fluent 2024 R1 Student Version software. The simulation was performed on a 3D city car model with airflow velocity variations of 10 m/s, 20 m/s, and 30 m/s. The data obtained were analyzed using grid independency analysis techniques to ensure the accuracy of the simulation results. The results show that the addition of a rear spoiler is able to reduce the lift coefficient thereby improving vehicle stability, although there is a slight increase in the drag coefficient as the airflow velocity increases. The negative ratio between the lift coefficient and drag coefficient indicates that the lift is downforce, which contributes to vehicle stability at high speeds. A suggestion from this research is the optimization of the spoiler shape to further reduce the drag coefficient without compromising vehicle stability. Further research can be conducted by testing variations in spoiler design and lighter materials for better aerodynamic efficiency.
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