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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 Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Automotive Experiences Jurnal Vokasi Mekanika ALSYS : Jurnal Keislaman dan Ilmu Pendidikan 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 Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Study of the variation of the leading edge of a railway crane on the aerodynamic characteristics Vernando, Willy Hardi; Kurniawan, Andre; Putra, Randi Purnama; Widia, Mirta
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.
Pengaruh Variasi Arus terhadap Kekuatan Bending pada Pengelasan Plat A36 Menggunakan Las SMAW (Shielded Metal Arc Welding) Chandra, Shandika; Waskito, Waskito; Jasman, Jasman; Putra, Randi Purnama
MASALIQ Vol 3 No 6 (2023): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v3i6.2078

Abstract

The use of A36 plate in the construction sector is closely related to connecting or welding between metals because it is useful in assembling a product to lighten human work. Examples of the use of A36 plate in the construction sector can be seen in trellis workshops, where this plate is often used as a support or support in making a balcony or canopy. However, sometimes workers do not understand how strong the plate is after being treated with welding, often they just guess at the durability of the plate, so this can cause various kinds of losses. Starting from damage to work objects to causing work accidents that result in loss of life. Therefore, this research examines the effect of variations in current strength on bending strength. This test was carried out on A36 plate material which was subjected to welding effects with varying currents of 80A, 100A, 120A and 140A. and a bending test was carried out using the ASTM E190-14 test standard, the results of this test were that at a current of 80A the bending strength value was 161.173 N/〖mm〗^2. Current 100A with a value of 229.851 N/〖mm〗^2. Current 120A with a value of 270.374 N/〖mm〗^2. And a current of 140A with a value of 374.839 N/〖mm〗^2. The test object with a current strength of 140A is the test object that has the highest bending strength value.
PENGARUH PENGGUNAAN BAHAN BAKAR PERTALITE DAN PERTAMAX TERHADAP PEFORMA MESIN PADA MOTOR EMPAT LANGKAH” Aprinaldi, Aprinaldi; Yuvenda, Dori; Primandari, Sri Rizki Putri; Putra, Randi Purnama
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 4 (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.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 Dinul, Fadhilah Ikhsan; Putra, Randi Purnama; Refdinal, Refdinal; Qalbina, Fitrah
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): 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.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.
Pengaruh Model Pembelajaran Team Based Project terhadap Hasil Belajar Siswa pada Mata Pelajaran Gambar Teknik Manufaktur Wira, Aski; Syahri, Budi; Adri, Junil; Putra, Randi Purnama
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): 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.v7i1.822

Abstract

Most of the teaching and learning of Manufacturing Engineering Drawing is still teacher-centered. Learning with the conventional model previously used made students passive and not independent in their learning. As a result, students are unable to understand the basic concepts of CAD drawings, interpret drawings, and understand the function of tools found in AutoCAD tools. This makes student learning achievements far from the minimum graduation criteria set by SMKN 5 Padang. The use of the Team Based Project learning model in this research aims to see its effect on student learning outcomes. Cluster random sampling is a sampling technique. To collect data, a pretest was carried out before the two groups were given different treatments. After the treatment, a post-test and assessment of student performance was carried out. The results of the analysis show that there are significant differences in learning outcomes. The test results showed an average in the cognitive domain of 88.7 for the experimental class and 82.58 for the control class, in the psychomotor domain 81.76 for the experimental class and 74.11 for the control class. Then the sign value from the T-test and F-test results is <0.05. Therefore, it can be concluded that the use of the Team Based Project learning model has a significant influence on student learning outcomes in Manufacturing Engineering Drawing.
Efektivitas Pembelajaran Blended Learning dengan Menggunakan Google Classroom Rahmat, Febri; Purwantono, Purwantono; Nurdin, Hendri; Putra, Randi Purnama
ALSYS Vol 5 No 2 (2025): MARET
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/alsys.v5i2.4829

Abstract

Blended learning using Google Classroom is a combination of face-to-face and online learning that utilizes the Google Classroom platform to facilitate interactions between students and teachers outside the classroom. This study aims to assess the effectiveness of implementing blended learning using Google Classroom. The study employs a quantitative method with a descriptive research design. It involves 27 students from the Grade XI Industrial Mechanical Engineering program at SMK Negeri 1 Sumatera Barat. Data collection was conducted through questionnaires and documentation The questionnaire in this study assessed five aspects: the use of Google Classroom, interaction in learning, technological accessibility, comfort and satisfaction, and the effectiveness of blended learning. The analysis results for each assessed aspect were as follows: the use of Google Classroom at 76.66%, interaction in learning at 71.29%, technological accessibility at 75.37%, comfort and satisfaction at 70.74%, and the effectiveness of blended learning at 68.51%. This indicates that students’ overall response to the effectiveness of blended learning using Google Classroom was 73.19%, categorized as effective.
Analisis Aerodinamika Rancangan Body City Car dengan Penambahan Spoiler Belakang Menggunakan Ansys Fluent Ananda, Yoga Rizki; Putra, Randi Purnama; Fernanda, Yolli; Qalbina, Fitrah
MASALIQ Vol 5 No 2 (2025): MARET
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.
Analisis Variasi Jumlah Sudu Terhadap Torsi Yang Dihasilkan Pada Turbin Vortex Aswanto, Trio Harinaldi; Purwantono, Purwantono; Putra, Randi Purnama; Afnison, Wanda
Asian Journal of Science, Technology, Engineering, and Art Vol 1 No 2 (2023): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v1i2.2070

Abstract

Water turbines, particularly vortex turbines, represent a promising alternative energy source with significant potential for development. Vortex turbines are a relatively novel type of water turbine, offering ample opportunities for further research. This study aims to assess the efficiency of different blade variations, specifically 3, 4, and 5 blades. Computational Fluid Dynamics (CFD) analysis was conducted using Solidworks 2022 software. The simulation results indicate that the torque values for 3 blades, 4 blades, and 5 blades were 0.26 Nm, 3.02 Nm, and 4.96 Nm, respectively. Efficiency calculations were performed using a formula, yielding efficiencies of 0.9% for 3 blades, 11.91% for 4 blades, and 20.74% for 5 blades. These results suggest that higher blade counts lead to greater efficiency.
Analisis Rugi-Rugi Pipa pada Distribusi Udara Bertekanan Tinggi Sistem Kompresor Semen PT. XYZ di Kota Padang Akbar, Arifki; Kurniawan, Andre; Fernanda, Yolli; Putra, Randi Purnama
Jurnal Pendidikan Tambusai Vol. 9 No. 2 (2025): Agustus
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v9i2.30888

Abstract

Penelitian ini menyelidiki kerugian tekanan dalam sistem distribusi udara bertekanan dari kompresor RKC V dan CF Silo Indarung V di PT Semen Padang serta dampaknya terhadap konsumsi energi. Kerugian tekanan terjadi dalam dua bentuk: kerugian mayor akibat gesekan sepanjang pipa, dan kerugian minor akibat sambungan seperti siku, tee, dan katup. Pendekatan kuantitatif digunakan untuk mengukur laju aliran, tekanan, suhu, dan karakteristik pipa. Pengumpulan data dilakukan melalui observasi lapangan, pengukuran langsung, dan wawancara dengan operator. Persamaan Darcy-Weisbach diterapkan untuk menganalisis penurunan tekanan, sementara kerugian biaya dihitung menggunakan rumus konsumsi energi. Hasil menunjukkan bahwa jalur Instrument Air mengalami kerugian tekanan yang jauh lebih tinggi (18,23 bar) dibandingkan jalur Plant Air (1,91 bar), terutama disebabkan oleh diameter pipa yang lebih kecil dan kecepatan aliran yang lebih tinggi. Total kerugian energi tersebut dikonversi menjadi biaya mingguan sekitar Rp 3,33 juta. Temuan ini menunjukkan adanya ketidakefisienan dalam sistem perpipaan saat ini, menekankan perlunya perancangan ulang dan optimalisasi sistem untuk mengurangi konsumsi energi dan biaya operasional dalam sistem kompresor industri semen.
Analysis of the Effect of Bottom Blade Inclination Angle Variations on Torque in Vortex Turbines Using Computational Fluid Dynamics (CFD) Kurniawan, Badri; Putra, Randi Purnama; Fernanda, Yolli; Qalbina, Fitrah
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): 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.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-ω 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.
Co-Authors A, Yufrizal Ahmad Arif Ahmad Arif Akbar, Arifki Ananda, Yoga Rizki Andre Kurniawan Andre Kurniawan Andrizal Andrizal Aprinaldi, Aprinaldi Arafat, Andril Ariansyah Ariansyah, Ariansyah Asnil Asnil Aswanto, Trio Harinaldi Aziz, Wildan Abdul Bahrul Amin Bambang Sudarmanta Budi Syahri Bulkia Rahim Chandra, Shandika Dinul, Fadhilah Ikhsan Dori Yuvenda Erizon, Nelvi Erzeddin Alwi Fauza, Anna Niska Febri Prasetya Febrianti, Roza Fitrah Qalbina Ghozali, Rahmatul Hadysyah, Muhammad Thoriqul Harmanto, Dani Jamaludin Jamaludin Jasman Jasman Junil Adri Krismadinata Krismadinata Kurniawan, Badri M. Yasep Setiawan Martias Martias Martias Martias Milana Milana Muhibbudin, Muhibbudin Muji Setiyo Muldi Yuhendri Nurdin Hendri Oki Muraza Phonepasith Phongdala Phongdala, Phonepasith Purwantono Purwantono Purwantono, Purwantono Rahadian Zainul Rahmat, Febri Refdinal, Refdinal Remon Lapisa Roza Febrianti Sri Rizki Putri Primandari Surya, Fajar Tin, Chau Trung Toto Sugiarto Tun, Hla Myo Vernando, Willy Hardi Wagino Wagino Wagino Wanda Afnison Waskito Waskito, Waskito Widia, Mirta Wira, Aski Wulansari, Rizky Ema Ya, Kyaw Zay Yolli Fernanda Yufrizal Yufrizal Zainal Abadi