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Mirza Yusuf
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Redaksi Quantum Teknika, Gedung D Lantai Dasar Kampus Terpadu Universitas Muhammadiyah Yogyakarta, Jl. Brawijaya, Tamantirto, Kasihan, Bantul, DI Yogyakarta, 55183
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Quantum Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : -     EISSN : 27211932     DOI : 10.18196
Core Subject : Engineering,
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Quantum Teknika : Jurnal Teknik Mesin Terapan or Quantum Teknika is a peer-reviewed journal published by Universitas Muhammadiyah Yogyakarta. Quantum Teknika journal publishes twice a year in April and October. Mechanical engineering is a branch of engineering focusing on mechanical engineering research. Despite of that, the development of the mechanical engineering does not solely encompass machinery science but also other machine-related field such as the automotive science which is composed of energy conversion, design and the forming materials. Quantum Teknika journal accommodates these fields in order to spark various innovations in Indonesia. In the journal Quantum Teknika, accommodate these fields in this period, the year of innovation began in Indonesia. - Automotive Research - Research in The Field of Energy Conversion - Materials Engineering - Design and Manufacture
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 113 Documents
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Analisis Pengaruh Tekanan dan Suhu Sirkulasi Pendingin pada Kompressor Oksigen Bertekanan Tinggi 2000 PSI/150 Bar Nurhakim; Komarudin
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 1 (2025): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i1.27920

Abstract

High‑pressure oxygen compressors are vital assets in hospitals to ensure continuous medical oxygen supply. The gas compression process generates considerable heat, which, if not properly controlled, can reduce efficiency and damage components. This study analyzes the effect of increasing pressure on temperature across different compression stages and evaluates the cooling circulation system performance of a 2000 PSI/150 Bar oxygen compressor at Redabolo Regional Hospital, Southwest Sumba. A quantitative experimental method was applied, recording temperature and pressure data at four compression stages and two cooling circulation points (bottom and top) under pressures of 0, 1000, and 2000 PSI. The data were processed to determine temperature changes (ΔT), actual heat transfer, and cooling and heat transfer efficiencies. Thermodynamic verification of adiabatic and isothermal processes was conducted using the ideal gas law.Results indicated that temperatures rose with increasing pressure, with the most significant rise occurring in Stages 3 and 4, reaching 89–90°C at 2000 PSI. The cooling circulation system proved highly effective, achieving approximately 83.05% cooling efficiency and 98.16% heat transfer efficiency. Verification confirmed that compression was neither purely adiabatic (due to active cooling) nor isothermal (due to rising temperature). Operating temperatures near the maximum limit at high pressure highlighted the need for heat management and predictive maintenance. The absence of post‑operation cooling in the second experiment emphasized its importance for component integrity. In conclusion, the compressor operated effectively with a reliable cooling system, though high temperatures in the final stages remain a concern. Recommendations include enhanced temperature monitoring, evaluation of cooling capacity, and strict post‑operation cooling procedures to minimize risks and optimize long‑term performance.
Effect of Layering and Fiber Orientation on The Tensile, Impact, and Flexural Properties of Polyester/Ramie Fiber Composites Maghzari Zaka Ahmad; Taufik Azhary; Pelangi Eka Yuwita
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 1 (2025): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i1.28402

Abstract

Natural fiber-based composite materials have recently emerged as a promising alternative to synthetic materials due to their eco-friendly characteristics and ability to provide good mechanical strength. One of the natural fibers with strong potential as reinforcement is ramie fiber, which, when combined with a polyester matrix, can produce strong yet lightweight composite materials. This study was conducted to evaluate the effect of fiber orientation and the number of layers on the mechanical properties of polyester (ramie fiber) composites. The specimens were fabricated using the hand lay-up method with three variations: without fiber, two layers of unidirectional fibers, and two layers of woven fibers. The test results revealed that the woven fiber specimens achieved the highest performance in the tensile test, with a tensile strength of 33.31 MPa and an elastic modulus of 1.8 GPa. In the flexural test, this specimen also recorded the highest stress of 16.39 MPa and a flexural modulus of 58.3 MPa. The impact test showed that the woven fiber specimen had the highest energy absorption capacity of 4.97 Joules and an impact strength of 130.46. Overall, the use of woven ramie fibers significantly enhanced the tensile strength and impact toughness of the composite. Nevertheless, the effectiveness of reinforcement strongly depends on the proper arrangement and distribution of the fibers.
Pengembangan Roll Burnishing dengan Penambahan Bola Bearing pada Kualitas Permukaan Hasil Pembubutan Mild Steel ST37 Patulak, Frengky Sulo; Musa Bondaris Palungan; Nitha
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 1 (2025): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i1.28432

Abstract

The turning process is a primary method in the manufacturing industry for producing components with high accuracy and surface quality. However, the results of turning often require additional finishing processes to achieve the desired surface roughness. This study employs the roll burnishing technique with the addition of ball bearings to enhance the surface quality of mild steel (ST37) after turning. The research analyzes the effects of spindle speed variation (70–1255 RPM) and depth of cut (0.2–1.4 mm) on surface roughness, as well as the correlation between these two parameters. The methods used include experiments with parameter variations, surface roughness measurements using a Surface Roughness Tester, and statistical analysis through linear regression and ANOVA using SPSS. The results indicate that spindle speed significantly affects surface roughness (R² = 0.758), with higher speeds reducing roughness. The depth of cut also has a strong influence (R² = 0.911), with increased depth reducing roughness. The combination of both parameters explains 74.4% of the variation in surface roughness. These findings provide practical guidance for the industry to optimize roll burnishing parameters to improve surface quality and production efficiency.

Page 12 of 12 | Total Record : 113

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