Jurnal Vokasi Mekanika (VoMek)

The Influence of Learning Motivation Using the Project-Based Learning Model on Student Learning Outcomes in PKK Subjects at SMK Negeri 5 Padang.

Deri Syafamukmin Paderma, Fiki Efendi, Yufrizal A, Bulkia Rahim — Sun, 31 Aug 2025 00:00:00 +0000

The main problem in this research is: How does learning motivation using the Project Based Learning Model affect learning outcomes in Class XI PKK subjects at SMK Negeri 5 Padang. The aim of this research was designed to: measure the influence of learning motivation using the Project Based Learning model on learning outcomes in Class XI PKK subjects at SMK Negeri 5 Padang. In this research, researchers used quantitative research methods, namely correlational research. Correlational research is research used to find out the magnitude of the relationship between variables. The sample for the research carried out was 31 students in the Class XI PKK subject at SMK Negeri 5 Padang. This research aims to measure the influence of learning motivation using the Project-Based Learning model on learning outcomes, using questionnaire instruments and test sheets that are filled in before and after being given treatment. Descriptive analysis shows that the average student learning motivation score is in the high category, while the average learning outcomes are in the good category. Correlation between Learning Motivation and Learning Outcomes: The correlation value of 0.963 is greater than the r table of 0.355, which shows that there is a significant positive relationship between students' Learning Motivation and their learning outcomes. The conclusion from this research is that students' learning motivation has a significant relationship to their learning outcomes in implementing the Project-Based Learning model. Student learning motivation is proven to have a greater influence on learning outcomes.

The Effect Of Vocational Pedagogy Learning On Students' Professional Readiness For Teaching In The School Internship Program (PLK) In The Field Of Mechanical Engineering

Sun, 31 Aug 2025 00:00:00 +0000

The Vocational Pedagogy course is an important factor in supporting students' teaching readiness. Observation shows that PLK students have a gap in teaching readiness even though they have taken Vocational Pedagogy courses. This study describes the teaching readiness of students in the Mechanical Engineering Department at Padang State University and analyzes the effect of the course on teaching readiness. The study employed a causal quantitative approach, surveying 92 students from the 2020 and 2021 cohorts, selected via Proportionate Stratified Random Sampling. Data were collected via a questionnaire and analyzed using descriptive analysis and simple linear regression. The results showed that students' mastery of the Vocational Pedagogy course was high, with an average score of 4.5. Students' teaching readiness was also in the "ready" category, with an average score of 4.5. Hypothesis testing results show that vocational pedagogy courses positively and significantly impact student teaching readiness. The coefficient of determination (R-square) is 0.545, meaning 54.5% of teaching readiness variables are influenced by vocational pedagogy courses, while other factors influence the rest. This study concludes that Vocational Pedagogy courses significantly and positively impact teaching readiness among students in the Department of Mechanical Engineering at FT-UNP. Micro teaching is a crucial factor in improving teaching readiness in this course.

A Comparative of Vocational Education System in Indonesia and Germany: A Qualitative Descriptive Study Based on the Perspective of Vice Principal for Student Affairs

Mochamad Dicky Yudhantaka, Zakiah Maulidi Putri, Asep Kurniawan — Sun, 31 Aug 2025 00:00:00 +0000

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

Analysis of the Effect of 90° Pipe Elbow Design Variations and Inlet Flow Velocity on Pressure Drop Using Computational Fluid Dynamics Simulation

Fanji Maulana Sidiq, Dony Hidayat Al- Janan — Sun, 31 Aug 2025 00:00:00 +0000

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 Weld Groove Type Variations on Deformation in Structural Carbon Steel Butt Joint Welding Using the Finite Element Method

Muhammad Daffa Dzaky, Delima Yanti Sari, Waskito Waskito, Junil Adri — Sun, 31 Aug 2025 00:00:00 +0000

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.

Effect of Airfoil Profile Variations on the Rear Wing of a Racing Car on the Downforce Coefficient Using Computational Fluid Dynamics (CFD) Simulation

Carlen Muhammad Hendra, Delima Yanti Sari, Arwizet K, Fitrah Qalbina — Sun, 31 Aug 2025 00:00:00 +0000

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 (C_down). 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 C_down 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 C_down 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

Yopi Zekrri Jenizah Putra, Delima Yanti Sari, Waskito Waskito, Zainal Abadi — Sun, 31 Aug 2025 00:00:00 +0000

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

Hukmanul Fikri, Delima Yanti Sari, Waskito Waskito, Wanda Afnison — Sun, 31 Aug 2025 00:00:00 +0000

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

Reyvanda Ayusran, Wanda Afnison, Irzal Irzal, Milana Milana — Sun, 31 Aug 2025 00:00:00 +0000

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)

Badri Kurniawan, Randi Purnama Putra, Yolli Fernanda, Fitrah Qalbina — Mon, 01 Sep 2025 00:00:00 +0000

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, Febri Prasetya, Purwantono Purwantono, Randi Purnama Putra — Mon, 01 Sep 2025 00:00:00 +0000

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

Mon, 01 Sep 2025 00:00:00 +0000

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°.

Effect of Problem Based Instruction (PBI) Model Assisted by Video on Learning Outcomes and Learning Motivation of Lathe Machining Engineering

Saepul Muzaki, Febri Prasetya, Jasman Jasman, Eko Indrawan — Mon, 01 Sep 2025 00:00:00 +0000

This study analyzes the effect of a video-assisted Problem-Based Instruction (PBI) model on students’ cognitive learning outcomes, while controlling for learning motivation as a covariate. It was motivated by the low academic performance of Grade XI of lathe machining engineering. A quasi-experimental design with a post-test-only control-group format was employed. The sample comprised 62 students, divided into an experimental group (n = 32), which received the video-assisted PBI treatment, and a control group (n = 30), which was taught via conventional methods. Data were collected through an objective achievement test and a learning-motivation questionnaire, and were analyzed using Analysis of Covariance (ANCOVA). The results indicated a significant difference in mean post-test scores between the two groups, with the experimental group achieving a higher mean score (M = 85.2) than the control group (M = 74.4). ANCOVA confirmed that the video-assisted PBI model had a statistically significant effect on learning outcomes (F(1, 59) = 26.268, p < 0.001), with a large effect size (partial η² = 0.308). Learning motivation also emerged as a significant covariate (F(1, 59) = 6.437, p = 0.014; partial η² = 0.098), indicating a moderate influence. These findings suggest that the video-assisted PBI model is effective in enhancing cognitive achievement, and that students’ motivation plays an important supporting role.

Keywords: Problem Based Instruction; Video Learning; Learning Outcomes; Learning Motivation; Machining Engineering