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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 108 Documents
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Pengaruh Double Chamfer Terhadap Kekuatan Tarik Dan Struktur Mikro Pada Hasil Sambungan Las Gesek Al 6061 Andi Priambudi; Iman Dirja; Rizal Hanifi
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 1 (2024): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i1.23039

Abstract

Aluminum, with a thermal conductivity close to 2/3 that of copper, can utilize friction welding effectively. Chamfer angles improve the welding quality by increasing the generated heat, resulting in higher mechanical properties. This study investigates the impact of chamfer angles (15°, 30°, and 45°) on the microstructure and tensile strength of friction-welded Al 6061 under conditions of 1600 rpm rotation, 50 MPa forging pressure, 20 MPa friction pressure, and 45 seconds of welding time. Microstructure and tensile strength tests were conducted on three specimens for each chamfer angle. Results show that increased friction time, friction pressure, and forging pressure lead to greater material loss due to flash formation. Microstructure analysis revealed that chamfer angles of 30° and 45° achieved better welding at the interface due to sufficient heat generation. In the heat-affected zone (HAZ), all angles (15°, 30°, and 45°) showed phase structure changes, with broader and more uniform Mg2Si and Fe3SiAl12 phases, attributed to the cooling process and relatively low heat. Tensile testing showed the highest tensile strength (177.9 MPa) and strain (6.42%) for the 30° chamfer angle, outperforming the 15° and 45° angles. The smallest strain (3.72%) was observed in the 15° chamfer angle, indicating the significant influence of chamfer geometry on friction welding outcomes.
Investigating Impact of Gasket Cylinder Addition and Octane Rating on Engine Performance Bahtiar Rahmat; Mohammad Burhan Rubai Wijaya; Yuris Bahadur Wirawan; Fahmy Zuhda Bahtiar; Katiko Imamul Muttaqin
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 1 (2024): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i1.23429

Abstract

The increase in people's mobility were reflected in the growing sales of motor vehicles. This has driven automotive manufacturers to compete in creating more powerful and efficient engines. These engines were designed with high compression ratios to achieve greater efficiency. High compression ratio engine re-quired fuel with the appropriate octane number to attain opti-mal performance. It is regrettable that many users had not un-derstood that an engine with high compression had required gasoline with a high octane rating as well. This research aims to investigate the impact of different compression ratios on the output power and torque of a single-cylinder combustion en-gine using RON 92, RON 95, and RON 100 gasoline. To modify the compression ratio, various numbers of gaskets were used on the cylinder head, with 2 and 3 gaskets for each configuration. A dynamometer test was employed to measure the differences in engine performance. The research results indicate that the engine with the highest compression pressure (11 Kg/cm2) using RON 100 gasoline produced the highest power of 7.90 kW, with the highest torque of 9.60 Nm. Conversely, the engine with the lowest compression pressure (10 Kg/cm2) using RON 92 gasoline produced the lowest power and the lowest torque.
Pengaruh Penambahan Octane Booster Pada Bahan Bakar Terhadap Emisi Gas Buang Kendaraan Bermotor Empat Langkah 150cc Khambali; Syahputra, Ekasakti Hergi
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.19696

Abstract

The increasing demand for motorcycles in Indonesia has contributed to rising air pollution, particularly from exhaust emissions such as CO, HC, CO₂, and O₂. This study aims to investigate the effect of adding Octane Booster to Pertamax fuel on reducing harmful emissions from 150cc four-stroke motorcycle engines. The experimental method involved adding 0.2g, 0.5g, and 1g of Octane Booster per liter of fuel and testing engine performance at 2000, 2500, 3000, and 3500 rpm using an emission analyzer. The results showed that the addition of Octane Booster significantly reduced emission levels of CO, HC, CO₂, and O₂. The most effective reduction was observed with 1g Octane Booster at 3500 rpm, where CO was reduced by 31%, HC by 34%, CO₂ by 35%, and O₂ by 33% compared to standard fuel. The study concludes that Octane Booster not only improves combustion efficiency but also contributes to lowering emissions, thereby supporting efforts to mitigate global warming and air pollution caused by motorized vehicles.
Analisis Beban Pendinginan di Ruang Kelas F212 Institut Teknologi Sumatera Manurung, Daniel; Furkhan, M. Aulia; G., Gita Christo; Alfian, Devia Gahana Cindi; Silitonga, Dicky J.; Carlodinho, Samuel; Khaira, M. Irsyad Bin Iskandar
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.21222

Abstract

Cooling load analysis in the classroom is carried out to support a comfortable learning process. Determining the cooling load is the foundation for planning an air conditioning system for a room. From the results of this determination, the capacity of the AC machine device used can be estimated. The method used in this solution is observation in the room, consisting of direct observation, measurement, and data recording. After obtaining all the data and calculating all possible heat dissipation factors, the total cooling load value in the room is 8584.34 W. The cooling capacity of the AC specifications in the room is 10040 W. Based on the results obtained, the total cooling load is lower than the cooling capacity of the AC in the room. So that the AC capacity in the room can provide comfort for the load in the room.
Pengaruh Plugging Terhadap Kinerja High Pressure Heater Tipe Shell and U-Tube Heat Exchanger (Studi Kasus: Unit 1- 4 di PT ABC) Muhammad, Ghaffar; Arirohman, Ilham Dwi; Naimah, Khoirun
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.23010

Abstract

High Pressure Heater (HPH) is an auxiliary component used to be required in regenerative steam power plants. The component is a heat exchanger utilized to enhance the power plant’s efficiency by enabling high pressure heating process for feedwater before entering the economizer in boiler using bled steam from turbine. The heat transfer effectiveness of HPH needs to be evaluated in relation to its operational conditions which are equipped with plugs to overcome leaks. This study aims to evaluate the impact of number of plugs on the high-pressure heater 5 in unit 1-4 PT ABC regarding heat transfer and its effectiveness. The Number of Transfer Unit (NTU) method along with Log Mean Temperature Difference (LMTD) method were employed in analysis of this research. The existing number of plugs are 4, 574, 100, and 111 in unit 1, 2, 3, and 4 respectively. The result shows that the heat transfer value for high pressure heaters in unit 1-4 PT ABC are 16.18 MW, 10.32 MW, 15.20 MW and 15.08 MW respectively, while the effectiveness value are 0.89, 0.74, 0.88, and 0.88. The study concludes that the effect of number of plugs in high-pressure heater regarding to heat transfer and effectiveness tends to be inversely linear.
Experimental Study of Drying Fruits and Vegetables Using The Freeze Drying Method With The Aim of Maintaining The Nutrition and Effectiveness of Processed Products Yusuf, Mirza; Nulhakim, Lukman; Prambandono, Bayu; Wisnujati, Andika; Yudhanto, Ferriawan
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.24507

Abstract

The potential of natural resources in tropical countries is very diverse. one of them is the abundant agricultural products. but there are some obstacles in the post-harvest cycle and the continuous availability when the harvest season ends. various methods of preserving agricultural products have been tested from conventional methods to advanced technology. one of the technologies for preserving agricultural products is freeze drying. various innovations continue to be tested until they get consistent results with good energy efficiency. This method was originally started in the pharmaceutical industry. Various treatments and flexible adaptations make this method penetrate the food industry to maintain the quality of food products. In the food industry, freeze drying is suitable for food products such as meat, fruits, grains, and vegetables. The advantage of freeze drying is that the food products produced do not change shape, form, texture, taste, and nutrition even though they have gone through the drying process. Of the various characteristics of fruits and vegetables have their own properties that can be changed with the temperature parameters applied in the freeze dryer method.
Analisa Pengaruh Preheating dan Post Weld Quench terhadap Kekuatan dan Struktur Mikro Baja S45C dengan Pengelasan Shielded Metal Arc Welding Rachman, Arif; Dirja, Iman; Setiawan, Reza
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.23046

Abstract

In many industrial contexts, steel is an everyday material. The technique of attaching metal parts using heat energy, known as welding, is something we encounter often; S45C is one of several steels that are used in machine construction. Protected metal arc welding is one type of welding that we come across frequently. Unwanted metallurgical changes, deformation, or residual stress in the base metal might occur as a consequence of uneven or excessive heating. A better method is to heat it up beforehand, often known as preheating, before welding. Determining the effect of preheating on the hardness of S45C steel during welding is one of the primary aims of this study. (2) to understand how changes in temperature and time affect the microstructure of S45C steel during welding and how it affects the final product. (3) ascertain the effect of temperature and duration on the resulting hardness of S45C steel welding. During the preheating procedure, the temperature is varied between 160 and 260 degrees Celsius, and the waiting periods are 7, 15, and 20 minutes, respectively. Hardness and microstructure testing, also known as metalografy, is performed on S45C steel after shielded metal arc welding (SMAW) to ascertain the degree of hardness and microstructure of the steel.
Analisis Variasi Waktu Perendaman Deep Cryogenic Treatment dan Aging terhadap Pengujian Kekerasan pada Aluminium 6061 Mahardika, Bimo Sakti; Naubnome, Viktor; Setiawan, Reza
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.23726

Abstract

Aluminum alloys are used more in industry due to its light weight, corrosion resistance, high strength, hardness, and recycling. This study examines the microstructure and hardness of 6061 aluminum alloy treated with Deep Cryogenic Treatment for 2, 12, 24, and 48 hours, followed by 1 hour of 1500C aging. Vickers hardness and microstructure testing will occur. The test results show that the hardness value has increased compared to the raw material. In the raw material variation, the hardness value is 53.4 HVN. The 2-hour immersion time variation experienced an increase in hardness value of 48.59% compared to the raw material. In the 12-hour soaking time variation, there was an increase of 43.9%. While the 24-hour and 48-hour variations also experienced an increase of 21.76% and 28.52% compared to the raw material. This is influenced by the microstructure that changes along with the variation in soaking time. Precipitates form due to the influence of deep cryogenic treatment which results in the hardness value of the 24-hour and 48-hour time variations decreasing compared to the 2-hour and 12-hour time variations.

Page 11 of 11 | Total Record : 108

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