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All Journal Jurnal Pendidikan Teknologi dan Kejuruan INVOTEK: Jurnal Inovasi Vokasional dan Teknologi JPP IPTEK (Jurnal Pengabdian dan Penerapan IPTEK) JURNAL PENDIDIKAN TAMBUSAI JOURNAL OF SCIENCE AND SOCIAL RESEARCH Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Didaktik : Jurnal Ilmiah PGSD STKIP Subang Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vocational : Jurnal Inovasi Pendidikan Kejuruan Automotive Experiences Jurnal Vokasi Mekanika MASALIQ: Jurnal Pendidikan dan Sains Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Engineering Researcher and Lecturer Asian Journal of Science, Technology, Engineering, and Art
Putra, Randi Purnama
Universitas Negeri Padang
Religion Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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MINAT MELANJUTKAN STUDI KEPERGURUAN TINGGI SISWA KELAS XII SMK NEGERI 1 SUMATERA BARAT Muhammad Thoriqul Hadysyah; Nelvi Erizon; Bulkia Rahim; Randi Purnama Putra
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 2 (2024): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i2.713

Abstract

Minat untuk melanjutkan studi keperguruan tinggi pada revolusi 4.0 saat ini sangat penting untuk masuk ke dunia kerja karena di butuhkan tenaga kerja dengan pendidikan yang tinggi dan wawasan yang luas, besarnya minat disebabkan oleh faktor yang menjadi pendukungnya. Telah dilakukan penelitian minat melanjutkan studi keperguruan tinggi siswa kelas XII SMK Negeri 1 Sumatera Barat. Tujuan penelitian untuk mengetahui seberapa besar minat dan seberapa besar penyebab minat siswa kelas XII SMK Negeri 1 Sumatera Barat untuk masuk perguruan tinggi yang disebabkan oleh faktor internal dan eksternal. Metode penelitian deskriptif kuantitatif dengan tujuan memaparkan fenomena yang sedang terjadi saat ini yang akan diteliti, teknik pengambilan sampel Proportionate Stratified Random Sampling, teknik analisis data mengunakan analisis deskriptif kemudian mengunakan analisis induktif atau inferensial digunakan dalam angket tertutup dengan skala likert. Hasil penelitian populasi 406, sampel 201 siswa dengan 32 pernyataan skor 1-5. Diketahui besar minat melanjutkan studi keperguruan tinggi siswa kelas XII SMK Negeri 1 Sumatera Barat presentase 43,28% kategori tinggi : kategori Sangat Tinggi 86 siswa, kategori Tinggi 87 siswa, kategori Sedang 21 siswa, kategori Rendah 6 siswa, kategori Sangat Rendah 1 siswa. Besar penyebab minat melanjutkan studi keperguruan tinggi siswa kelas XII SMK Negeri 1 Sumatera Barat disebabkan oleh motivasi siswa presentase 51,24% kategori sanggat tinggi, cita-cita siswa presentase 41,79% kategori tinggi, kemauan siswa presentase 45,27% kategori sangat tinggi, lingkungan sekolah siswa presentase 56,72% kategori rendah, lingkungan keluarga siswa presentase 48,26% kategori sangat tinggi.
PENGARUH PENGGUNAAN BAHAN BAKAR PERTALITE DAN PERTAMAX TERHADAP PEFORMA MESIN PADA MOTOR EMPAT LANGKAH” Aprinaldi Aprinaldi; Dori Yuvenda; Sri Rizki Putri Primandari; Randi Purnama Putra
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 4 (2024): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i4.779

Abstract

Every year, the population continues to grow, leading to an increase in daily activities. To meet transportation needs, light motor vehicles, such as petrol motorcycles, are the main choice. Motorbikes have been widely marketed in various models. Along with the development of knowledge about motorbikes, there is a type of automatic motorbike (matic). internal combustion piston engine is a type of heat engine that transforms fuel energy into mechanical energy through the movement of a piston. It uses one or more moving pistons to convert pressure into rotational motion. Inside the engine cylinder, a fuel mixture is introduced, producing hot gases that push the piston down and drive the crankshaft. The types of fuel used include premium, pertalite, and pertamax. The combustion of these fuels has an impact on the environment. PT Pertamina (Persero) plans to discontinue premium fuel and replace it with pertalite and pertamax, which are increasingly favoured by consumers. A study revealed that pertamax fuel is more effective at improving engine performance than pertalite, as shown by dyno test results that showed the highest torque and power values with pertamax fuel at 6,000 RPM, namely 6.01 kW and 9.53 nM.
Analisis Aerodinamika Rancangan Body Kendaraan Prototype Bermesin Diesel Menggunakan ANSYS Fluent Fadhilah Ikhsan Dinul; Randi Purnama Putra; Refdinal Refdinal; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i1.780

Abstract

Transportation industry is the third largest energy consumer, the focus on energy saving in vehicles and reducing exhaust emissions is major concern. Aerodynamics is one of the important subjects in vehicle engineering today. The more aerodynamic the vehicle, the lighter the engine performance, which can reduce fuel usage. This study aims to examine the effect of vehicle body design on the value of drag coefficient (Cd), lift coefficient (), and the ratio between lift coefficient and drag coefficient (/Cd). The method in this research is a numerical method that utilizes the CFD feature in the Ansys Fluent 2024 R1. The drag coefficient value with a speed of 10 m/s is 0.0155, a speed of 20 m/s is 0.0110, and a speed of 30 m/s is 0.0083. While the value of the lift coefficient with a speed of 10 m/s is obtained worth 0.0177, a speed of 20 m/s worth 0.0358, and a speed of 10 m/s worth 0.0455. Then the vehicle body design obtained the value of the /Cd ratio with a speed of 10 m/s worth 1.1419, a speed of 20 m/s worth 3.2545, and a speed of 30 m/s worth 5.4819. The conclusion this research is that the design of the vehicle body has a drag coefficient value decreasing as the speed increases and conversely the lift coefficient value increases. Based on the /Cd ratio value, it indicates that the vehicle body design is an aerodynamic design because the higher /Cd ratio, the more efficient the vehicle performance.
Analisis Penambahan Turbin Magnus pada Kapal Tanker 1700 DWT Menggunakan Simulasi Computational Fluid Dynamics Fajar Surya; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
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.
Wind Flow Analysis on Software-Based U-Type Savonius Wind Turbine Blades Using Solidworks Flow Simulation Muhammad Aulia; Randi Purnama Putra; Andre Kurniawan; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/2cnmaw42

Abstract

Savonius wind turbines are a type of vertical axis wind turbines that work based on the principle of drag force. The way this turbine works begins with a gust of wind that hits the turbine blades which are generally semi-cylindrical or resemble the letter "U". When the wind blows, the side of the blade facing directly in the direction of the wind will receive a greater thrust, while the side of the blade facing the wind will receive a smaller thrust, resulting in a difference in force that causes the turbine to rotate. This study aims to analyze the performance of savonius wind turbines based on the value of power coefficient (Cp) and torque coefficient (Ct) at wind speed variations. The method used in this study is a numerical method with a Computational Fluid Dynamics (CFD) approach. Simulations were carried out at wind speed variations of 3 m/s, 5 m/s, and 7 m/s to determine the effect of changes in wind speed on the flow characteristics and performance of the turbine. The simulation results showed that the value of the power coefficient (Cp) and the torque coefficient (Ct) were in the range of 0.140 to 0.157. This value changes as the wind speed increases, which shows that the variation in wind speed affects the performance of the savonius wind turbine. Based on these results, it can be concluded that the Savonius wind turbine has good potential to be used in areas with low to medium wind speeds.
Numerical Simulation of the Effect of Blade Shape on Vertical Axis Wind Turbine Using NACA 0015, NACA 4415, and NACA 7510 Rezki Alhakim; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/8fw5gp43

Abstract

Energy is a resource that can be used to perform various tasks, including fuel, electricity, mechanical energy, and heat. With technological advances and global economic development, the demand for electricity will continue to increase. This drives various research efforts towards alternative energy sources, ranging from the development of existing tools to the creation of new innovations. Wind turbines work by utilizing the kinetic energy of the wind flow to rotate the blades, which are then converted into electrical energy through a generator system. The purpose of this study is to analyze the effect of curvature shape on the Lift Coefficient (Cl), Drag Coefficient (Cd), and Power Coefficient (Cp) of vertical axis wind turbine blades. Simulations were carried out in 3D using ANSYS Fluent software and the SST turbulence model, with wind speeds ranging from 4 to 7 m/s. The aerodynamic profiles analyzed were NACA 0015, NACA 4415, and NACA 7510. Aerodynamic simulations of vertical axis wind turbines were carried out using a steady-state approach with a multi-reference frame (MRF) rotation model to obtain the average aerodynamic characteristics of the rotor. The simulation results show that NACA 4415 produces the best Cl value with relatively controlled Cd, while NACA 0015 shows the worst aerodynamic performance. NACA 7510 produces the highest Cp value at all wind speed variations, despite low Cl and high Cd values, indicating that the drag mechanism dominates torque generation at low speeds.
Analysis of MIG Welding Parameters on the Welding Quality of Apron Feeders in the BINS Workshop Unit of PT. XYZ Aldo Alfattah Sudjono; Nadry Heroza; Randi Purnama Putra; Purwantono
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/x5p06b82

Abstract

This study examines the effect of MIG Welding parameter variations on the quality of Welded joints in apron feeder components at the BINS Workshop Unit of PT. XYZ. The issue raised is that variations in Welding practices in workshops can cause visual defects and reduce the reliability of heavy-duty components. The objectives of this study are to identify the variations in MIG parameters applied in the field, analyze the quality of Welds based on visual inspection, and determine the most suitable parameters to be adopted for Welding components as a whole. The Method used was a field experiment with a qualitative descriptive approach: Welding was performed on SS400 plate joints (10 mm–6 mm and 4 mm–6 mm) using ER70S-6 wire and CO2 shielding gas with two sets of parameters (wire feed speed 7 m/s vs. 5 m/s), and the results were analyzed through standard visual inspection. The results showed different characteristics: parameters with a higher wire feed produced deeper penetration and wider beads (more suitable for thick plates), while parameters with a lower wire feed provided process stability and a fairly good visual appearance, which was chosen for overall Welding (voltage = 20–22 V; wire feed = 5 m/min). Although the process was generally effective, visual defects such as spatter, porosity/pin hole, cold lap, stop-start, and surface concavity were detected. The study recommends parameter control, machine maintenance, and operator competency improvement to minimize defects and increase joint reliability.
Study of the variation of the leading edge of a railway crane on the aerodynamic characteristics Willy Hardi Vernando; Andre Kurniawan; Randi Purnama Putra; Mirta Widia
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.v3i2.145

Abstract

The front body design of the railway crane is flat or bluff type. The design causes a large drag, so the railway crane requires high fuel consumption to drive. Therefore, this study aims to modify the front body of the railway crane by applying the shape of the leading edge to reduce drag. This research also investigates the effect of leading-edge angles on aerodynamic characteristics. The method used is computational fluid dynamics, using the flow simulation feature of the Solidworks research licence software. This study considered three variations of leading edge angle (40°, 45° and 50°). The simulation results show that the larger the leading edge angle, the lower the drag coefficient value. In addition, the simulation shows that there is a high air pressure at the front of the railway crane with the bluff shape, while the modified railway crane with the leading edge applied has a lower air pressure at the front. Furthermore, the results and discussion in this article present the simulation results showing the velocity streamline and pressure contour of each model.
Co-Authors A, Yufrizal Ahmad Arif Ahmad Arif Akbar, Arifki Aldo Alfattah Sudjono Andre Kurniawan Andre Kurniawan Andrizal Andrizal Anna Niska Fauza Aprinaldi Aprinaldi Arafat, Andril Ariansyah Ariansyah Arif Juliari Kusnanda Asadellah, Dimas Pandhu Asnil Asnil Aswanto, Trio Harinaldi Aziz, Wildan Abdul Badri Kurniawan Bahrul Amin Bambang Sudarmanta Budi Syahri Bulkia Rahim Chandra, Shandika Dani Harmanto Dani Harmanto Dori Yuvenda Eko Indrawan Erzeddin Alwi Fadhilah Fadhilah Fadhilah Ikhsan Dinul Fajar Surya Farhan Rahmat Putra Fauza, Anna Niska Febri Prasetya Febrianti, Roza Fitrah Qalbina Ghozali, Rahmatul Jamaludin Jamaludin Jasman Jasman Junil Adri Krismadinata Krismadinata M. Yasep Setiawan Martias Martias Martias Martias Milana Milana Mirta Widia Muhammad Aulia Muhammad Thoriqul Hadysyah Muhibbudin Muhibbudin Muji Setiyo Muldi Yuhendri Nadry Heroza Nelvi Erizon Nurdin Hendri Oki Muraza Phonepasith Phongdala Phongdala, Phonepasith Purwantono Purwantono Purwantono, Purwantono Rahadian Zainul Refdinal, Refdinal Remon Lapisa Revaldo Nur Hidayat Rezki Alhakim Rifelino Rifelino Romy Dwipa Yamesa Away Roza Febrianti Sri Rizki Putri Primandari Tin, Chau Trung Toto Sugiarto Tun, Hla Myo Vernando, Willy Hardi Vickram Reski Andri Wagino Wagino Wanda Afnison Wanda Afnison Waskito Waskito, Waskito Widia, Mirta Willy Hardi Vernando Wira, Aski Wulansari, Rizky Ema Ya, Kyaw Zay Yoga Volanda Saputra Yogi Dian Alfana Yolli Fernanda Yufrizal Yufrizal Zainal Abadi