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All Journal Journal of Mechanical Engineering Learning
Ahmad Roziqin
Universitas Negeri Semarang
Mechanical Engineering

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Development of Website-Based Multimedia “Project Three” on Body Painting Learning Achievements Muhammad Rizal Agus Adriansyah; Hadromi; Ahmad Roziqin; Sonika Maulana
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.29982

Abstract

This study aimed to develop a website-based multimedia product, Project Three, for body painting learning and to examine its feasibility, effectiveness, and student responses in vocational automotive education. The research used a research and development design with the ADDIE model, covering analysis, design, development, implementation, and evaluation stages. The product was implemented in the Light Vehicle Body Engineering Department of SMKN 5 Kendal using a one-group pretest–posttest design involving 23 grade XI students. Data were collected through expert validation sheets, learning achievement tests, reliability testing, normality testing, non-parametric statistical testing, N-gain analysis, and student response questionnaires. The developed multimedia obtained very feasible validation scores from media experts at 93.60% and material experts at 97.05%. The test instrument showed excellent reliability, with a Cronbach’s Alpha value of 0.984 for 35 items. The normality test indicated non-normal data distribution, while the statistical test showed a significant difference between pretest and posttest scores. The N-gain mean was 0.6716, categorized as moderate, with an effectiveness percentage of 67.16%, indicating that the product was quite effective. Student responses reached 84.09%, categorized as appropriate. Project Three is feasible and moderately effective for supporting body painting learning outcomes in vocational high school settings.
Effect of activator spraying amount on the thickness and appearance of water transfer printing film coating results Gilang Supanto; Ahmad Roziqin; Febrian Arif Budiman
JMEL : Journal of Mechanical Engineering Learning Vol. 15 No. 1 (2026): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v15.i1.30246

Abstract

This research investigates the influence of activator spray quantity on the thickness and visual appearance of Water Transfer Printing (WTP) film coatings on Aluminium alloy 5052 surfaces. The study employed an experimental method, varying activator spray quantities at 2, 3, 4, and 5 times. Coating thickness was measured using a Coating Thickness Tester, while appearance was visually assessed by 10 experts based on surface cleanliness, substrate coverage, and pattern neatness. The results indicate a positive influence of activator spray quantity on both parameters. For coating thickness, increasing activator quantity consistently led to greater average film thickness, with a total increase of 63.06% from 2 to 5 sprays (averaging 17.81% per additional spray). Concurrently, the visual appearance improved across all criteria; surface cleanliness increased by an average of 32.62%, substrate coverage by 29.56%, and pattern neatness by 31.79% for each additional spray. The most drastic improvements in both thickness and appearance criteria were generally observed in the transition from lower to intermediate spray quantities, suggesting an optimal activator range for great WTP results.
Analysis of The Effect of The Intake Manifold Curvature Angle of The KZR Engine on The Characteristic of Air Fluid Flow Arga Fernando; Rizqi Fitri Naryanto; Ahmad Roziqin; Sonika Maulana
JMEL : Journal of Mechanical Engineering Learning Vol. 15 No. 1 (2026): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v15.i1.31136

Abstract

This research is to determine the effect of variations in the intake manifold curvature angle on turbulence intensity, turbulent kinetic energy, flow velocity, and fluid flow patterns. One effort to reduce excessive fossil fuel consumption is modifying vehicles to consume fuel more efficiently through a more complete combustion process. One such method involves modifying the intake manifold of a motorized vehicle. This study used FD-based numerical study with a quantitative approach to investigate changes in the curvature angle of the intake manifold. The aim of The modification process of the intake manifold structure was conducted on a 2012 Vario 125 (KZR) motorcycle through simulation. The purpose of this simulation is to conduct a fundamental analysis before implementing changes to the intake manifold structure. The geometric definition of the intake manifold was created using SolidWorks 2020, and the simulation was performed using Ansys Workbench 2022. The curvature angle variations of the intake manifold were 110°, 120° (standard), and 130°. The simulation results showed differences in outcomes for each curvature angle. The highest turbulence intensity, turbulent kinetic energy, and flow velocity were observed at the 110° angle. This indicates that modifying the intake manifold through simulation can influence turbulence flow during the combustion process. These findings can be considered to achieve better torque and power output in vehicles in the future.
Co-Authors Arga Fernando Budiman, Febrian Arif Gilang Supanto Hadromi Muhammad Rizal Agus Adriansyah Rizqi Fitri Naryanto Sonika Maulana