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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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SolidWorks Flow Simulation: Selecting the optimal mesh for conducting CFD analysis on a centrifugal fan Salmat, Salmat; Yanti Sari, Delima; Fernanda, Yolli; Prasetya, Febri
Journal of Engineering Researcher and Lecturer Vol. 2 No. 3 (2023): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v2i3.104

Abstract

The accuracy of mesh use determines the suitability of simulation results with experimental test results, therefore it is necessary to study the type and number of mesh used for flow simulation. This study aims to investigate the type of mesh and the number of cells that are appropriately used in the simulation of centrifugal fans using the Solidworks Flow Simulation module. The research was conducted by comparing the simulation results with the experimental results on centrifugal fans that have been carried out by previous studies. In this research, the type of mesh used is global mesh. The parameter of determining the number of cells is done by varying the mesh level because the mesh level affects the number of cells. In this simulation study, the boundary condition is set to one flow volume of 5 m3/h and a rotation speed of 92.362 rad/s. In this study, the total pressure and efficiency of the centrifugal fan are the things that are seen from the comparison of flow simulation with the experiment. Based on the simulation results that have been carried out, mesh levels 1 to 4 show results that differ significantly from the experimental results. At machine levels 5 to 7, the results are close to the experimental results, but the closest total pressure and efficiency values are at mesh level 5. The results of this study can be a reference for research that simulates centrifugal fans.
Optimizing student learning in Computer Numerical Control subject: A comprehensive analysis of influential factors Fadri, Muhammad Al; A, Yufrizal; Fernanda, Yolli; Prasetya, Febri
Journal of Engineering Researcher and Lecturer Vol. 2 No. 3 (2023): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v2i3.114

Abstract

The learning outcomes achieved by students are influenced by many factors. This study aims to determine the level of support of factors (motivation, interest, family, teacher's role, learning methods and learning facilities) that influence the learning process in achieving student learning outcomes in CNC learning in class XI. The subjects in the study were Class XI students majoring in Mechanical Engineering at SMK Negeri 5 Padang in the 2022/2023 academic year totalling 37 people. Because the number of research subjects (population) is less than 100 people, so all of them are taken as samples or total sampling. Data collection was carried out using observation, questionnaires and documentation. Data analysis techniques using descriptive statistical techniques. From the data analysis, it shows that of each factor studied, the learning facility factor has the lowest level of support for student academic success compared to other factors that have been studied by researchers. Therefore, learning facilities at SMK Negeri 5 Padang in CNC subjects need to be improved again to support the student learning process and achieve better learning achievements for students.
Implementation of experiential learning method in mechanical drawing course to enhance student understanding through real projects Nasution, Ridhollah; K, Arwizet; Fernanda, Yolli
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.
Comparative Analysis of Energy Efficiency Measurement in Building with Manual Calculation and RETScreen Expert Saputra, Andika; Kurniawan, Andre; Fernanda, Yolli; Karudin, Arwizet; Ahmed, Shabir
IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Vol. 1 No. 2 (2024): IJIMCE : International Journal of Innovation in Mechanical Construction and Ene
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/ijimce.v1i2.27

Abstract

Energy efficiency is a crucial aspect of energy saving efforts. Energy efficiency is an important factor in reducing energy consumption and environmental impacts. One of the important steps that can be taken in achieving energy efficiency is to conduct an energy audit. An energy audit is a systematic process to evaluate energy use in a building and identify energy saving opportunities that can be done. RETSCreen Expert is one of the software that can be used for energy audits. This research focuses on analyzing the comparison between manual calculations and calculations using RETScreen Expert software on building energy efficiency. The factors used to analyze energy efficiency are air conditioning systems, room lighting systems, and the use of other electronic devices, over a one-year period. The analysis results show that there are differences in calculations between the use of manual methods and RETScreen Expert. The difference between manual calculation and RETScreen Expert is 15.42%. With this difference, it is assumed that manual calculations and calculations using RETScreen Expert do not have too much difference. The results of the energy audit also show that the air conditioning system (HVAC) is a major contributor to the building's energy consumption.
MEMBANGUN MASA DEPAN PROFESIONAL: ANALISIS IMPLEMENTASI MODEL PROJECT-BASED LEARNING PADA PEMBELAJARAN TEKNIK PENGELASAN Yuliardiansyah, Haris; Purwantono, Purwantono; Fernanda, Yolli; Yuvenda, Dori
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 3 (2024): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i3.717

Abstract

Studi ini bertujuan untuk menilai efektivitas model pembelajaran berbasis proyek (Project-Based Learning atau PjBL) dalam pendidikan pengelasan di sekolah vokasi. Penelitian ini menyelidiki bagaimana penerapan PjBL dapat memperkuat pemahaman siswa tentang konsep pengelasan dan dampaknya pada hasil belajar. Pendekatan penelitian ini menggunakan eksperimen dengan dua kelompok: kelompok eksperimen yang menerima pembelajaran dengan metode PjBL, dan kelompok kontrol yang menerima metode pembelajaran konvensional. Kedua kelompok terdiri dari 17 siswa dari SMK Negeri 1 Guguak. Data dikumpulkan melalui pre-test dan post-test untuk mengukur pemahaman siswa sebelum dan sesudah penerapan PjBL. Analisis data kuantitatif menggunakan perangkat lunak SPSS 16 untuk menghitung rata-rata, median, nilai minimum, dan maksimum. Hasil analisis menunjukkan bahwa kelompok eksperimen mengalami peningkatan yang signifikan dalam post-test, dengan rata-rata nilai 80,59, sedangkan kelompok kontrol memiliki rata-rata 75,59. Median kelompok eksperimen (80) juga lebih tinggi daripada kelompok kontrol (75), mengindikasikan bahwa PjBL dapat meningkatkan pemahaman siswa dalam pendidikan pengelasan. Namun, penelitian ini juga menemukan tantangan, seperti keterbatasan sumber daya dan pemahaman pendidik tentang metode PjBL. Kesimpulan dari penelitian ini adalah bahwa PjBL efektif dalam meningkatkan pemahaman siswa tentang pengelasan di sekolah vokasi. Rekomendasi penelitian ke depan meliputi eksplorasi faktor yang mendorong keberhasilan PjBL serta strategi untuk mengatasi hambatan dalam penerapannya. Studi ini memberikan landasan bagi pembuat kebijakan dan pendidik untuk mengembangkan pendidikan vokasi yang lebih baik dan relevan dengan dunia industri.
Analisis Penambahan Turbin Magnus pada Kapal Tanker 1700 DWT Menggunakan Simulasi Computational Fluid Dynamics Surya, Fajar; Putra, Randi Purnama; Fernanda, Yolli; Qalbina, Fitrah
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.v7i4.901

Abstract

Turbin magnus merupakan turbin yang berfungsi sebagai sistem propulsi tambahan pada kapal dengan tujuan meningkatkan efisiensi energi dan mengurangi emisi gas buang. Tujuan penelitian ini adalah untuk menganalisis perbandingan performa turbin magnus tipe flettner rotor dan thom rotor terhadap koefisien lift (C?), koefisien drag (Cd), gaya thrust (Fr), serta hambatan total baru kapal (RT New). Metode penelitian menggunakan simulasi berbasis Computational Fluid Dynamics (CFD) dengan menggunakan software Ansys Fluent 2025 R1 Student Version. Hasil penelitian menunjukkan bahwa turbin magnus tipe thom rotor memiliki nilai C? lebih tinggi sebesar 0,3364; 0,3276; 0,3157 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s dibandingkan flettner rotor sebesar 0,2785; 0,2508; 0,2442 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s dengan penurunan nilai lebih stabil pada variasi kecepatan angin. Sedangkan nilai Cd thom rotor sebesar 0,6487; 0,5333; 0,4959 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s juga lebih besar dibandingkan flettner rotor sebesar 0,5705; 0,4537; 0,4229 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s. Perhitungan gaya thrust (Fr) menunjukkan peningkatan signifikan pada kedua tipe rotor seiring kenaikan kecepatan aliran, dengan kontribusi terbesar pada thom rotor. Hambatan total baru kapal (RT New) menurun secara relatif terhadap kondisi awal, menandakan adanya efisiensi propulsi tambahan. Maka penambahan turbin magnus mampu memberikan gaya dorong tambahan, mengurangi hambatan total, serta meningkatkan efisiensi operasional kapal. Thom rotor menghasilkan gaya angkat yang lebih stabil, sementara flettner rotor lebih efisien dalam menekan hambatan, sehingga pemilihan tipe rotor dapat disesuaikan dengan kebutuhan operasional kapal.
Characterization of Density and Stability of Oil Palm Empty Fruit Bunch Briquettes without Binder under Variations of Molding Temperature and Compaction Pressure Albasyit, Muhammad Ravi; Fernanda, Yolli; Refdinal, Refdinal; Kurniawan, Andre
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.v7i4.902

Abstract

The dependence on fossil fuels in Indonesia continues to increase in line with the growing energy consumption, thus necessitating alternative energy sources that are more environmentally friendly and sustainable. Oil palm empty fruit bunches (OPEFB) are agro-industrial waste with great potential to be utilized as raw material for briquette production; however, their utilization remains suboptimal. This study aims to analyze the effect of molding temperature and compaction pressure on the density and stability of binderless OPEFB briquettes. The research method employed is experimental, using a quantitative descriptive-analytical approach with non-carbonized briquettes. The treatment variations include molding temperatures (230°C, 250°C, and 280°C) and compaction pressures (1 MPa, 3 MPa, and 5 MPa) applied to two types of materials, namely dried and undried OPEFB. The results indicate that increasing temperature and compaction pressure significantly enhances briquette density. At a temperature range of 250–280°C and a pressure of 5 MPa, the briquettes achieved the highest density (>1.0 g/cm³) with strong shape stability. The thermoplastic lignin content in OPEFB melts at high temperatures, acting as a natural binder. Briquettes with a density ?0.80 g/cm³ exhibited strong physical integrity, while those with a density <0.70 g/cm³ tended to be brittle. It can be concluded that the optimum conditions for producing high-quality binderless OPEFB briquettes are achieved at a temperature range of 250–280°C and a compaction pressure of 5 MPa, resulting in briquettes with excellent density and shape stability suitable as a renewable alternative energy source
Characterization Of Bioethanol From Cassava As A Fuel In Gasoline Engines Ihsan, Muhammad; Fernanda, Yolli; K, Arwizet; Kurniawan, Andre
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.v7i4.913

Abstract

The energy demand in Indonesia continues to increase, particularly in the transportation sector, which remains highly dependent on fossil fuels such as gasoline. This dependency causes several issues, including the depletion of fossil fuel reserves and the rise of greenhouse gas emissions that negatively impact the environment. One potential solution to address these challenges is the development of bioethanol as a renewable and environmentally friendly alternative fuel. Bioethanol can be produced from starchy materials, one of which is white cassava (Manihot esculenta), known for its high productivity and wide availability in Indonesia. The production process of bioethanol consists of several stages, including liquefaction, fermentation, and distillation, where fermentation temperature plays a crucial role in determining the ethanol yield. Previous studies have shown that variations in fermentation temperature significantly influence the efficiency of bioethanol production. This study aims to characterize bioethanol produced from cassava fermentation at various temperature variations and to evaluate its potential as a fuel for gasoline engines. The results are expected to contribute to the improvement of bioethanol production efficiency and to promote cassava utilization as a renewable energy source in supporting national energy sustainability.
Analisis Performa Mesin Diesel Menggunakan Campuran Biodiesel dari Minyak Jelantah–Dexlite dengan Pengaturan Waktu Injeksi Bahan Bakar M Chalid Kurnia; Dori Yuvenda; Yolli Fernanda; Sri Rizki Putri Primandari; Muhammad Raihan
Journal of Innovative and Creativity Vol. 5 No. 2 (2025)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v5i2.2905

Abstract

Krisis energi dan peningkatan emisi gas rumah kaca akibat penggunaan bahan bakar fosil mendorong pengembangan energi alternatif yang ramah lingkungan. Biodiesel dari minyak jelantah menjadi salah satu solusi berkelanjutan karena ketersediaannya yang melimpah dan sifatnya yang terbarukan. Penelitian ini bertujuan untuk menganalisis kinerja mesin diesel generator Yanmar TF 105 MR-di yang menggunakan campuran biodiesel dari minyak jelantah (B30, B40, B50) dengan optimasi waktu injeksi bahan bakar (16°, 17°, 18°, dan 19° sebelum TMA) pada kecepatan konstan 2000 rpm dan beban 1000–4000 watt. Parameter yang diuji meliputi daya, torsi, konsumsi bahan bakar spesifik (SFC), dan efisiensi termal. Hasil penelitian menunjukkan bahwa campuran B30 dengan waktu injeksi 18° sebelum TMA memberikan performa terbaik, dengan efisiensi termal tertinggi dan nilai SFC yang lebih rendah dibandingkan campuran lainnya. Pengaturan waktu injeksi berpengaruh signifikan terhadap karakteristik pembakaran dan kinerja mesin, dimana waktu injeksi yang terlalu awal atau terlambat dapat menurunkan efisiensi dan meningkatkan konsumsi bahan bakar. Penelitian ini membuktikan bahwa optimasi waktu injeksi penting untuk mengkompensasi perbedaan sifat fisikokimia biodiesel, serta membuka peluang pemanfaatan minyak jelantah sebagai bahan bakar alternatif yang ramah lingkungan dan ekonomis.
Analisis Kinerja Boiler Pada PLTU Ombilin Berdasarkan Variabel Operasional Menggunakan Model Machine Learning Random Forest Devky Meinaldi Fernanda; Arwizet Arwizet; Yolli Fernanda; Andre Kurniawan
Journal of Innovative and Creativity Vol. 5 No. 2 (2025)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v5i2.2911

Abstract

Penelitian ini mengembangkan model prediksi beban PLTU menggunakan algoritma Random Forest dengan proses tuning hyperparameter melalui grid search untuk memperoleh konfigurasi optimal, yaitu n_estimators 200, max_depth 30, min_samples_split 10, dan min_samples_leaf 2. Model dilatih dan diuji menggunakan data historis dan data eksternal sebanyak 4.149 sampel, menghasilkan performa prediksi yang sangat baik dengan nilai MAE sebesar 0,6517, RMSE 1,4305, dan R-squared 0,9650. Hasil visualisasi scatter plot menunjukkan prediksi yang akurat dengan sebagian besar titik dekat garis ideal. Model ini membuktikan kemampuan generalisasi dan reliabilitas yang tinggi dalam memprediksi beban PLTU, sehingga dapat digunakan efektif dalam monitoring dan pengelolaan operasional pembangkit listrik.
Co-Authors - Primawati A, Yufrizal Abdillah Irfan Abdu Idham Adam Mandra Suwandi Agustian, Rizki Ahmed, Shabir Akbar, Arifki Akhmad Rais Al Rahman, Muhammad Fadil Albasyit, Muhammad Ravi Alhakim, Rezki Ambiyar, Ambiyar Aminuyati Ananda, Yoga Rizki Andika Putra ANDIKA SAPUTRA Andre Kurniawan Andre Kurniawan Andre Kurniawan Andri, Junil Arafat, Andril Arwizet Arwizet Arwizet Arwizet, Arwizet Arwizet. K Asadellah, Dimas Pandhu Ashekul Islam Azis, Ismail Badri Kurniawan Budi Syahri Delima Yanti Sari Desyandri Desyandri Devky Meinaldi Fernanda Diki Afrianto Dionova, Aldi Dori Yuvenda Dori Yuvenda Dwi Sakti Putra DWI SURYANTO Egis Egis Eko Indrawan Elvira Zondra, Elvira Erizon, Nelvi Fadhilah Fadhilah Fadri, Muhammad Al Fahrendra, Aqsal Faisal, Afdal 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 Hendri Nurdin Ikhsan, Ghufra 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 Firdaus Muhammad Raihan Muhammad Riski Hidayat Muhammad Shiddiq Muhammad, Maghfiridhani Mulianti Nasution, Ridhollah Nelvi Erizon Nurdin Hendri Nurwijayanti Pratomo, Muhammad Agung Primandari, Sri Riski Putri Primawati Primawati, Primawati Purwantono Purwantono purwantono purwantono Purwantono, Purwantono Putra, Kevinda Putra, Randi Purnama Rafki Irianto Rahmadiawan, Dieter Ramadhan, Fadli Randi Purnama Putra Refdinal Refdinal, Refdinal Refdinal, Refdinal Refitra Irawan Remon Lapisa Revaldo Nur Hidayat Ridhatul Arif Riezky Hidayattullah Rifelino Rifelino Riki Saputra, Riki Riky Satria Rizki Ramadhan Nasution, Muhammad Robby, Muhammad Rudy Anarta Salmat, Salmat Seprianto, Ekon Sherly Rahmayani Shi, Shih-Chen Sri Rizki Putri Primandari Surya, Fajar Syahril Syahril Syaiful Salim Teki Haryono Toto Sugiarto Usin Usin Waskito Willy Vernando Yovindra, Difa Yufrizal Yufrizal Yuliardiansyah, Haris Yusmaita, Eka Zainal Abadi Zhuang, Wei-Ting Zulvani Adha