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Jurnal Vokasi Mekanika
Published by Universitas Negeri Padang
ISSN : 26561697     EISSN : 26562812     DOI : https://doi.org/10.24036/vomek.v4i3
Core Subject : Education, Engineering,
Education Mechanical Engineering
Jurnal Vokasi Mekanika menyambut baik kiriman yang memberikan wawasan tentang isu-isu terkini dan utama yang berkaitan dengan pendidikan kejuruan dan teknologi serta ilmu Keteknikan dalam bidang Teknik Mesin. Jurnal ini menyediakan tempat bagi para peneliti dan praktisi untuk mendiskusikan, mengejar, dan mempromosikan pengetahuan di bidang studi pendidikan teknologi kejuruan dan ilmu Keteknikan dalam bidang Teknik Mesin yang sedang berkembang pada saat sekarang ini. Bahasa naskah ditulis dalam bahasa Indonesia. Harus ada diskusi kritis tentang isu-isu baru dan signifikan dan kontribusi ke bidang terkait. Artikel dapat berasal dari salah satu bidang berikut: Teori, Strategi, Pendekatan, Metode Atau Model Pembelajaran TVET Penerapan dan Pengembangan Media, Modul, Bahan Ajar dan Buku Ajar Manajemen dan Kebijakan TVET Pengembangan Kurikulum TVET Evaluasi Program dan Pembelajaran TVET Penerapan Teknologi Kejuruan Terkait TVET Pengembangan Profesionalitas Guru TVET Energi dan energi terbarukan Sistem produksi dan Manufaktur Rekayasa bahan Teori dan aplikasi dinamika fluida komputasi Ilmu ilmu Teknik Mesin Lainnya.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 418 Documents
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Perbandingan Sistem Pendidikan Kejuruan di Indonesia dan Jerman: Studi Deskriptif Kualitatif Berdasarkan Perspektif Wakasek Kesiswaan Dicky Yudhantaka, Mochamad; Maulidi Putri, Zakiah; Kurniawan, Asep
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.v7i3.872

Abstract

This study aims to describe a comparative analysis of the vocational high school (SMK) education systems in Indonesia and Germany, as viewed from the perspective of the Vice Principal for Student Affairs at SMKN 1 Kedawung. The research adopts a qualitative approach using descriptive methods. Data were obtained through documentation and interviews with key informants, specifically the Vice Principal for Student Affairs at SMKN 1 Kedawung in Cirebon. Data collection techniques included document analysis and semi-structured interviews, while data analysis was conducted through the processes of data collection, reduction, presentation, and conclusion drawing. The findings indicate that the vocational education system in Germany is highly integrated and well-established, particularly when compared to those of other developed countries. The Dual System (Ausbildung) model implemented in Germany is globally recognized as a prestigious framework for vocational education and training. This system provides numerous advantages for students, including a curriculum that is continuously updated and aligned with industry demands, opportunities to gain practical work experience, improved career prospects with competitive remuneration, and direct learning within actual work environments. In contrast, the adoption of the Dual System model in Indonesia continues to face several challenges, particularly in terms of relevance, quality, and industry engagement. Nevertheless, efforts toward improvement and systemic reform are ongoing
Effect of Weld Groove Type Variations on Deformation in Structural Carbon Steel Butt Joint Welding Using the Finite Element Method Dzaky, Muhammad Daffa; Sari, Delima Yanti; Waskito, Waskito; Adri, Junil
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.v7i3.877

Abstract

Deformation in welded joints can reduce the precision, strength, and service life of a structure, especially in structural carbon steel commonly used in the construction industry. One of the main factors influencing deformation is the type and angle of the weld groove. This study aims to analyze the effect of groove type and angle variations on deformation in butt joint welding of structural carbon steel. The method used is a numerical simulation based on the Finite Element Method (FEM) using ANSYS software, consisting of transient thermal and transient structural analyses. The groove variations include V-grooves with angles of 45°, 60°, and 75°, as well as U-grooves with angles of 50°, 60°, and 70°. The simulation results show that the V-groove with a 45° angle produces the maximum deformation of 2.1317 mm, while the U-groove with a 70° angle results in the minimum deformation of 0.23808 mm. These findings indicate that U-grooves generally produce lower deformation compared to V-grooves. Therefore, selecting the appropriate groove design can enhance the quality of weld joints and the overall structural performance.
Analisis Pengaruh Variasi Desain Elbow Pipa 90° dan Kecepatan Aliran Inlet Terhadap Pressure Drop Menggunakan Simulasi Computational Fluid Dynamics Sidiq, Fanji Maulana; Al- Janan, Dony Hidayat
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.v7i3.880

Abstract

Most industrial processes utilize fluids as a medium for as a medium for transporting materials, both liquid and gas. Pipes as one of the channel components for fluid distribution are often difficult to avoid in their placement. Pressure drop often occurs in pipe bends which can reduce system efficiency. This study aims to examine the effect of variations in 900 pipe elbow design and velocity inlet on pressure drop. The method in this research is the Computational Fluid Dynamics method on Ansys Fluent 2024 R2 Student version software. In this study, 3 elbow pipe designs with the same pipe diameter and connection position dimensions were compared. The connection process is carried out at the same height so that gravity is treated in the same position. The results of this study show that elbow design 1 has the smallest pressure drop value compared to the other two elbow designs. This is clearly seen in the simulation results of pressure drop values, velocity magnitude vectors profiles, visualization of contours statics pressure and velocity magnitude. The conclusion of this research is that the pressure drop value is strongly influenced by elbow design and velocity inlet. If the velocity inlet increases, the pressure drop value also increases. While in the elbow design if the sharper the turn angle, the greater the pressure drop value will be. Based on the resulting pressure drop value, elbow 1 design is more efficient than the other two elbow designs because it has a lower pressure drop value.
Effect of Airfoil Profile Variations on the Rear Wing of a Racing Car on the Downforce Coefficient Using Computational Fluid Dynamics (CFD) Simulation Hendra, Carlen Muhammad; Sari, Delima Yanti; K, Arwizet; 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.v7i3.881

Abstract

Variation of airfoil profile shape in race car rear wings plays a crucial role in generating optimal downforce to improve traction and vehicle stability. The main issue addressed in this study is the lack of clarity regarding which airfoil profile and angle of attack configuration are most effective in producing the highest downforce coefficient (Cdown). This research aims to analyze the aerodynamic performance of symmetric airfoils NACA 0012 and NACA 0015 at three different angles of attack, namely 9.5°, 19.5°, and 29.5°, using Computational Fluid Dynamics (CFD) simulation. The simulations were performed under steady-state flow conditions with an appropriate turbulence model to accurately capture pressure distribution and airflow characteristics. Results show that NACA 0012 generated higher and more stable Cdown values at low to medium angles, with the highest value of 1.4 at 29.5°. In contrast, NACA 0015 exhibited a more gradual performance increase and reached a Cdown of 1.2 only at the highest angle. The study concludes that slender airfoil profiles like NACA 0012 are more suitable for circuits with sharp corners, while NACA 0015 is better suited for straight tracks requiring progressive aerodynamic stability. This research contributes to optimizing rear wing design based on the aerodynamic demands of race cars.
Numerical Simulation of Natural Frequency on Shaft Using ANSYS Software Putra, Yopi Zekrri Jenizah; Sari, Delima Yanti; Waskito, Waskito; Abadi, Zainal
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.v7i3.883

Abstract

This descriptive study aims to analyze the effect of shaft diameter on the natural frequency and maximum deformation of a rotating shaft system. The analysis was conducted through numerical simulation using ANSYS Workbench software. The shaft and two symmetrically positioned disks were modeled, and a modal analysis was performed using the Finite Element Method (FEM) to determine the system’s first ten vibration modes. Simulation results showed that the natural frequencies ranged from 80.495 Hz to 280.4 Hz, with a maximum deformation of 58.903 mm occurring in the 9th mode. The lower modes (modes 1–6) exhibited lower frequencies but higher deformation, while higher modes (modes 7–10) showed more complex vibration patterns with consistently significant deformation values. This indicates that higher frequency does not necessarily result in lower deformation, and the system may still experience critical vibration. These findings demonstrate that the shaft's geometric configuration, including diameter and mass distribution of the disks, significantly affects its dynamic behavior. The simulation provides deeper insight into the vibration characteristics of the critical speed shaft apparatus used in practical experiments and serves as a reference for validating theoretical approaches such as the Dunkerley and Rayleigh methods.
Numerical Analysis of Coupled Thermal-Mechanical on Drum Brakes Fikri, Hukmanul; Sari, Delima Yanti; Waskito, Waskito; Afnison, Wanda
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.v7i3.884

Abstract

Drum brakes are one of the crucial components in motor vehicle braking systems, particularly in motorcycles, due to their advantages in production cost and resistance to environmental contamination. However, this type of brake has limitations in dissipating heat during braking, which can lead to temperature accumulation, thermal deformation, and reduced braking efficiency. This study aims to analyze the thermo-mechanical performance of drum brakes with various cooling groove designs (solid, straight-grooved, and slant-grooved) using a numerical method based on Finite Element Analysis (FEA) in ANSYS Workbench. The analysis was conducted in a transient manner, both thermally and structurally, to evaluate temperature distribution and total deformation for each design. The results show that the slant-grooved drum brake design yields the lowest temperature distribution and total deformation values, especially at high braking speeds, with a temperature distribution of 56.899 °C and total deformation of 17.67 × 10⁻³ mm. These findings indicate that groove design significantly affects the heat dissipation and structural deformation performance of the brake system. The study concludes that the slant-grooved design is superior in reducing heat and deformation, thereby offering the potential to improve braking safety and efficiency.
Analysis of Musculoskeletal Disorders in Electric Vehicle Prototype Drivers Using the Nordic Body Map Method Ayusran, Reyvanda; Afnison, Wanda; Irzal, Irzal; Milana, Milana
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.v7i3.885

Abstract

The dwindling availability of fossil-based energy sources has spurred breakthroughs in the evolution of eco-conscious transportation, one of which is manifested in the Indonesian Electric Car Competition (Kompetisi Mobil Listrik Indonesia – KMLI). In this arena, collegiate teams engineer lightweight, single-occupant electric prototype vehicles emphasizing energy thrift. Nonetheless, spatial constraints and performance optimization frequently take precedence over ergonomic design, heightening the likelihood of musculoskeletal strain. This investigation seeks to examine bodily discomforts related to the musculoskeletal system as encountered by the operator of a prototype electric vehicle, employing the Nordic Body Map (NBM) assessment tool. The inquiry adopted a descriptive format via a focused case analysis involving the primary driver from the Megathrust Eco Team representing Universitas Negeri Padang (UNP) in the 2024 KMLI. Post-operation, the participant filled out the NBM form to denote discomfort regions, referencing a Likert-type scale from 1 (no pain) to 4 (extreme pain). The outcomes identified the cervical region, shoulders, dorsum, and lumbar zone as areas with elevated distress, classified under Pain and Intense Pain levels, thus revealing substantial ergonomic concerns. From these insights, it is inferred that the seating layout and cockpit geometry must be reconsidered and fine-tuned according to the driver’s anthropometric dimensions to alleviate physical complaints and boost vehicular comfort. The study aspires to aid in fostering electric vehicles that are more attuned to human-centered design, balancing well-being and operational safety.
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.
Utilizing Augmented Reality Media to Enhance Students’ Lathe Learning Outcomes Ariansyah, Ariansyah; Prasetya, Febri; Purwantono, Purwantono; Putra, Randi Purnama
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.v7i3.889

Abstract

The integration of technology in vocational education has become a critical need to support 21st-century skills, especially in practice-based learning such as Basic Mechanical Engineering subjects. One promising innovation is the use of Augmented Reality (AR) media, which enables interactive three-dimensional visualization to help students concretely understand abstract concepts. This study aims to examine the effectiveness of lathe-based AR media in improving student learning outcomes and motivation in Grade X of the Machining Engineering Department at SMK Semen Padang. The research employed a quasi-experimental method using a non-equivalent control group design. The subjects consisted of two classes: the experimental class (using AR media) and the control class (using conventional learning methods). Data were collected using pre-tests and post-tests to assess learning outcomes and Likert-scale questionnaires to evaluate learning motivation. The analysis results showed that the use of AR media significantly increased student learning outcomes and motivation compared to traditional methods. Based on hypothesis testing and normalized gain score analysis, the AR media was found to be highly effective in the learning process. In conclusion, lathe-based Augmented Reality media proved to be an effective interactive learning tool that enhances students' academic performance and motivation, while also contributing to the development of innovative media in technical education.
Experimental Study of Geometrical Accuracy of Artec Leo 3D Scanner on Complex Object Scanning Al Saidhi, Muhammad Khattami; Rifelino, Rifelino; Sari, Delima Yanti; Prasetya, Febri
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.v7i3.890

Abstract

This study aims to measure the geometrical accuracy of complex object scanning using the Artec Leo 3D scanner. The scanned object is a wheel rim, with eight combinations of parameters including variations in distance (50 cm and 100 cm), scanning angle (45° and 90°), and lighting conditions (indoor and outdoor). Deviations were measured from four reference points on the scanned model and compared to a reference model. The results show that the Indoor configuration with a scanning distance of 50 cm and a scanning angle of 90° gives the smallest deviation of 0.025 mm (0.01%), while the Outdoor configuration with a scanning distance of 50 cm and a scanning angle of 45° produces the largest deviation of -3.275 mm (-1.80%). The overall average deviation of all combinations is -0.63 mm or -0.36%, indicating that the Artec Leo can produce high accuracy if configured with the right parameters. The smallest deviation was obtained under indoor scanning conditions with a scanning distance of 50 cm and a scanning angle of 90°.

Page 41 of 42 | Total Record : 418

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