Article Per Year (5 Year)
p-Index From 2021 - 2026
0.61
P-Index
This Author published in this journals
All Journal International Journal of Research in Vocational Studies (IJRVOCAS) AMMA : Jurnal Pengabdian Masyarakat Journal of Mechanical Engineering and Applied Technology
Ahmad Mamba’udin
Politeknik Negeri Semarang
Aerospace Engineering Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Social Sciences Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Pengenalan Sistem Mesin Pesawat Bagi Siswa SMK Nasional Berbah Ahmad Mamba’udin; Elfrida Rizky Riadini; Arif Pambekti
AMMA : Jurnal Pengabdian Masyarakat Vol. 3 No. 12 : Januari (2025): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This activity aims to provide students of SMK Nasional Berbah with basic insights and understanding of aircraft engines. The limited access to practical knowledge of aviation technology serves as the main rationale for implementing this program. Through this activity, students receive materials covering fundamental theories of aircraft engines, types of engines, the working principles of turbine and piston engines, as well as visual and interactive demonstration sessions. The methods used include interactive lectures, group discussions, and component introductions through video-based media. The results indicate an improvement in students' understanding of basic aircraft engine concepts and a growing interest in the field of aviation. This activity aims to spark vocational school students’ interest in aviation science.
Beyond a Single Damping Coefficient: Experimental Mapping of Nonlinear and Stroke-Dependent Automotive Shock-Absorber Behaviour Avicenna An-Nizhami; Ignatius Gunawan Widodo; Muhammad Showi Nailul Ulum; Elfrida Rizky Riadini; Ahmad Mamba’udin; Yuris Bahadur Wirawan
Journal of Mechanical Engineering and Applied Technology Vol. 4 No. 2 (2026): VOLUME 4 ISSUE 2 YEAR 2026 (JULY 2026)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v4i2.7842

Abstract

Shock absorbers are commonly represented by a constant viscous damping coefficient, although their actual force response may vary nonlinearly with piston velocity, stroke amplitude, and operating conditions. This study experimentally compared the damping characteristics of original and aftermarket rear shock absorbers using a laboratory test rig with variable-speed and variable-stroke operation. Both specimens were tested at strokes of 60, 90, and 120 mm and excitation frequencies of 0.5–2.0 Hz, corresponding to peak piston velocities of 0.0942–0.7539 m/s. Maximum damping forces were measured using a force gauge, and the resulting force–velocity relationships were evaluated before and after modification of the test rig. Three-term sinusoidal functions were also fitted to the measured data using the MATLAB Curve Fitting Tool. Both shock absorbers exhibited nonlinear digressive behaviour, characterised by a rapid force increase at low-to-intermediate velocities followed by a stroke-dependent high-speed plateau. Matched-velocity comparisons showed that damping force varied with stroke even at approximately equal peak velocities, demonstrating that the response was not governed by piston velocity alone. Using the post-modification data, the aftermarket shock absorber generated an average damping force 15.8% higher than the original unit over the complete test matrix. Its peak force exceeded that of the original shock absorber by 29.4%, 9.8%, and 12.6% at strokes of 60, 90, and 120 mm, respectively. The corresponding apparent damping coefficients were also consistently higher for the aftermarket unit. These findings demonstrate that shock-absorber performance should be evaluated using experimentally determined force–velocity operating maps across multiple strokes and velocities rather than a single nominal damping coefficient.
Development of an Eco-Friendly Egg Tray Molding Machine for Paper Waste Reduction at Politeknik Negeri Semarang Yusuf Dewantoro Herlambang; Ahmad Mamba’udin; Yuris B. Wirawan; Dianisa K. Sandi
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.541

Abstract

The increasing consumption of paper at Politeknik Negeri Semarang has led to a significant rise in paper waste that has not been managed optimally. This condition presents a significant issue, characterized by waste accumulation and the underutilization of recyclable paper as a value-added product. Although various paper-recycling technologies have been developed, most existing systems operate on an industrial scale, making them unsuitable for vocational education settings that require compact, energy-efficient, and user-friendly equipment. This gap highlights the need for a practical, small-scale recycling technology that can be effectively implemented within the campus environment. This research aimed to design and construct a Paper Egg Tray Machine as a small-scale waste-paper processing solution capable of converting paper waste into environmentally friendly packaging products. The research method includes needs assessment, mechanical and electrical design, fabrication, and performance testing. The machine was designed with dimensions of 1400 × 990 × 1400 mm, utilizing a 12 V battery system and a 220 V, 150 W dynamo motor with a power-transfer mechanism based on an electric winch. The pulp-processing system uses a 200 mm centrifugal blade agitator. The results showed that the machine successfully processes waste paper into homogeneous pulp and forms it into recycled egg trays with consistent shape and structural stability. The produced trays meet basic functional requirements as protective packaging and demonstrate potential for small-scale production. In conclusion, the Paper Egg Tray Machine contributes to the development of simple, efficient, and environmentally friendly waste-processing technology suitable for vocational education while offering broader opportunities for implementation in small recycling-based enterprises.
Co-Authors An Nizhami, Avicenna Arif Pambekti Dianisa K. Sandi Elfrida Rizky Riadini Ignatius Gunawan Widodo Muhammad Showi Nailul Ulum Yuris B. Wirawan Yuris Bahadur Wirawan Yusuf Dewantoro Herlambang