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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 118 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.
Mechanical and Thermal Properties of Cellulose Nanofiber-Reinforced Polypropylene Composites Compatibilized with PP-g-MA Azhary, Taufik; Azhar, Faruq Avero
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.28974

Abstract

Polypropylene is widely used in the automotive industry because it is lightweight, inexpensive, and easy to process, but it has limitations, including relatively low mechanical properties and a tendency to shrink. Cellulose nanofiber is used as an environmentally friendly reinforcement with high strength, but differences in properties between hydrophobic polypropylene and hydrophilic CNF result in poor compatibility. To overcome this, a polypropylene-graft-maleic anhydride (PP-g-MA) coupling agent is added to enhance interfacial bonding. This study aims to evaluate the effects of CNF and PP-g-MA content on the mechanical properties, thermal stability, and water resistance of polypropylene materials produced by extrusion and injection molding. The outcomes show that substituting 1 wt% CNF provides significant reinforcement, elevating the tensile strength to 22.90 MPa and the flexural strength to 29.70 MPa. At higher CNF contents, agglomeration occurs, leading to decreased mechanical properties and increased water absorption up to 0.35%. The substitution of PP-g-MA increased the compatibility of the PP/CNF composite, as indicated by the appearance of an ester peak in the FTIR, an increase in crystallinity in the DSC/XRD, and a shift in the onset of degradation by 340°C to 350°C in the PP/1CNF/5PP-g-MA composite. This formulation also produced a tensile strength of 25.60 MPa, a flexural strength of 33.00 MPa, and low water absorption. Although substituting CNF reduced impact strength, using PP-g-MA restored impact strength to near that of pure polypropylene. Overall, the PP/1CNF/5PP-g-MA composite was determined to be the optimal composition due to its balanced mechanical properties, thermal stability, and water resistance.
Analisa Kinerja Mesin Freezer Kapasitas 100 Liter dengan Penambahan Subcooler untuk Proses Pembekuan Es Batu Anwar, Mochamad; Sudrajat, Danu; Belyamin; Wibowo, Berbudi; Soeboer, Deni Achmad; Moryanto, Sri
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.30007

Abstract

The independent demand for ice by coastal communities and small-scale business operators is commonly fulfilled using small-scale freezer units. The cooling prici performance is a critical parameter for evaluating operational effectiveness and energy efficiency. This study evaluates the performance of a 100-liter freezer equipped with a subcooler compared to a standard configuration. The system was tested for 240 minutes at an ambient temperature of approximately 30 °C, with thermal and electrical parameters recorded every 20 minutes. Temperature, operating pressure, and power consumption data were analyzed to determine thermodynamic parameters, including the actual coefficient of performance (COP), Carnot COP, and system efficiency. The results indicate that the freezer configuration with a subcooler produces a lower refrigerant temperature after the compressor, ranging from 62–63 °C, compared to 71–72 °C in the standard configuration. The refrigerant temperature after the condenser decreased from 46–47 °C to 32–33 °C. The discharge pressure was reduced from 90–95 psi in the standard system to 60–80 psi in the subcooled system. The actual COP increased from 1.93–2.95 to 2.26–3.44, while the Carnot COP increased from 2.82–3.97 to 3.08–4.36. System efficiency was higher in the freezer with the subcooler, ranging from 73–79%, compared to 68–74% in the standard freezer. Overall, the integration of a subcooler improves heat transfer performance, reduces compressor workload, and increases energy efficiency by approximately 3–6%.
Pengaruh Kecepatan Putaran Menggunakan Pahat Karbida Tungsten Kobalt 6% terhadap Frekuensi Getaran dan Kekasaran Permukaan Baja ST 37 Chendri Johan; Paulus Aket; Rony Rukka; Lery Alfriany Salo
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.30666

Abstract

This study aims to analyze the effect of rotational speed variations in the turning process using 6% cobalt tungsten carbide chisels on the vibration frequency and surface roughness of ST 37 steel. Tests were conducted using a conventional lathe with five rotational speed variations: 350 rpm, 400 rpm, 450 rpm, 500 rpm, and 550 rpm. Other cutting parameters were kept constant, namely feed rate of 0.7 mm/rev, depth of cut of 0.7 mm, and the use of SAE 10 oil cooling media. The results showed that the higher the rotational speed, the lower the surface roughness value. The highest roughness value was obtained at a speed of 350 rpm of 7.420 μm, while the lowest value was at 550 rpm of 4.66 μm. Conversely, the vibration frequency increased with increasing rotational speed. The lowest vibration frequency of 1.53 mm/s occurred at 350 rpm, while the highest value was 3.53 mm/s at 550 rpm. These results show that increasing the rotational speed produces a smoother surface, but increases tool vibration.
Effect of Pressure on Frequency Stability and Regulator Response in an LPG-Fueled Generator Set Rizqi, Muhammad Ihsanul; Kusumawardana, Arya; Isrofiasrory , Rey Gasta
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31026

Abstract

The increasing demand for electrical energy has led to the extensive use of generator sets as backup power sources, particularly in areas with unstable grid supply. However, conventional generator sets operating on petroleum-based fuels are associated with low efficiency and high exhaust emissions. Liquefied Petroleum Gas (LPG) is considered a cleaner alternative, although its performance strongly depends on the stability of gas supply pressure. Previous studies have generally evaluated generator performance based on output characteristics without simultaneously examining the interaction between cylinder pressure, hose pressure, and the mechanical response of the regulator. This study addresses this gap by examining the combined effects of LPG cylinder and hose pressures on frequency stability and regulator behavior during generator operation. Experimental tests were conducted on an LPG-fueled generator set under load variations of 0%, 25%, 50%, and 75%. Cylinder pressure, hose pressure, regulator opening angle, and output frequency were measured simultaneously using pressure, position, and electrical measurement sensors. The results demonstrate a statistically significant correlation between gas pressure and frequency stability. Stable operation was achieved when hose pressure was maintained within the range of 0.8-1.0 psi, resulting in output frequencies of 49.8-50.2 Hz, whereas pressures below this range caused significant frequency deviation. These findings confirm that maintaining stable gas pressure is essential for achieving optimal frequency performance and provide practical insights for improving regulator design in LPG-fueled generator systems.
Pengaruh Bentuk Geometri Papan Komposit Serbuk Kayu Terhadap Serapan Bising Ruang Yudhanto, Ferriawan; Rachmawati, Putri; Yusuf, Mirza; Dhewanto, Santo Ajie
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31141

Abstract

This study aims to analyze the effect of variations in surface geometry on the acoustic performance of composite boards made from jackfruit sawdust waste. The material was combined with urea-formaldehyde adhesive and catalyst, then processed using a hot-press method at 160°C and 60 tons. The specimens were formed into four geometric variations, namely funnels, cones, tubes, and pillars, using a CNC machine. Tests were conducted using the impedance tube method over the frequency range of 200-1600 Hz to determine the sound absorption coefficient (α) and reflection coefficient (RC). The results show that the α value increases with increasing frequency. At low frequencies (200-400 Hz), the absorption capacity remains low but increases significantly at medium to high frequencies. The pillar geometry showed the best performance with a maximum α value of around 0.42 and the lowest reflection value. It indicates that modification of the surface geometry plays an important role in improving wave interaction and the effectiveness of sound absorption.

Page 12 of 12 | Total Record : 118

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