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Redaksi International Journal of Mechanical Engineering Technologies and Applications (MECHTA), Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Published by Universitas Brawijaya
ISSN : -     EISSN : 27223213     DOI : https://doi.org/10.21776/ub.mechta
Core Subject : Science, Engineering,
Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
International Journal of Mechanical Engineering Technologies and Applications (MECHTA) is published by Mechanical Engineering Department, Engineering Faculty, Brawijaya University, Malang, East Java, Indonesia. MECHTA is an open-access peer-reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. MECHTA accepts submissions from all over the world, especially from Indonesia. MECHTA aims to provide a forum for international academicians, researchers, and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of MECHTA is specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in the English Language.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 16 Documents
 1   2 
Search results for , issue "Vol. 3 No. 2 (2022)" : 16 Documents clear
Controlling Supplier Supply Stability with High Demand During the Covid-19 Pandemic at PT PQS Santoso, Sugeng; Anjela, Lia; Alvionita, Uci; Firmansyah, Firmansyah; Etlanda, Khoirul Akbar; Fatmawati, Ari Ana
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.2

Abstract

COVID-19 with a snap into a very influential factor in all sectors of the economy worldwide. The decrease in demand is also strongly felt in the manufacturing sector in Indonesia, even there are some factories were forced to have to lay off thousands of employees because it is not able to pay the salaries of employees. The opposite condition was experienced by PT PQS Indonesia, which experienced an increase in demand by 40% compared to the average demand for 6 months before COVID-19, because some of the company's branches in other countries had stopped production because they had to follow local government policies. Eventually all orders were sent to be produced at PT PQS Indonesia. The increase in demand does not mean that PT PQS Indonesia did not experience obstacles during the COVID-19 pandemic, the problem faced was the decline in delivery performance from suppliers, which impacted on the reduced stock of raw material stock and could even lead to production stops. This is because the suppliers were affected by Covid-19. This is a challenge because PT PQS has dozens of suppliers at home and abroad. To repeat this so that production does not stop, PT PQS Indonesia added a feature to help control supplier delivery performance. In 2018 the average delivery performance is only 60% — 70%, and the management target is 90% for local suppliers and 85% for overseas. This “Supplier Delivery Performance” feature really helps the procurement team to control the arrival of goods and provide information to suppliers related to their delivery performance, as well as being one of the index KPIs to evaluate supplier performance for one year before the Annual Vendor Meeting is held. To create a “Supplier Delivery Performance” index, PT PQS must also create SOPs or standardize them so that all relevant suppliers and procurement teams can easily understand them. 
The Development of an Egg Incubator Prototype with the Use of Heat on the Condenser Side of the Refrigerator Budiastawan, Ngurah Putu; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.8

Abstract

The development for an egg incubator prototype with the use of heat on the condenser side of the refrigerator belongs to  Research and Development (R&D) conductment with the aim of knowing the process of developing an egg incubator prototype by using heat on the condenser side of the refrigerator to find out the feasibility  level. The method in this study uses Quality Function Deployment (QFD), which is a method used in the early stages of product design and development that makes quality design of a product based on the market quality demand and order of the customer. The prototype development process undergo  several stages, including: preliminary survey to the farmer community, design, instrument validity testing, prototype making, media export testing and small group testing. Based on the calculation of the results of the validity test assessment by the instrument content expert, the content validity value of 1 which refers to the instrument validity criteria table is included in the very high validity criteria. Furthermore, based on the calculation of the validation results from the media expert test and the small group test, it gets a percentage of 100% for the media expert test and a percentage of 95.20% for the small group test and refers to the eligibility level qualification table with a scale of 5 in the very appropriate category without the need for revision, so that the  developed prototype egg incubator  are suitable for use and marketable for the industry.
Effect of Firing Temperature on Density, Porosity, Impact Strength, and Macro Structure of Crucible Materials Made from Graphite, Kaolin, and Castable Cement Latif, Abdul; Rusiyanto, Rusiyanto; Sunyoto, Sunyoto; Kriswanto, Kriswanto; Fitriyana, Deni Fajar
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.3

Abstract

Along with the advancement of modern times and technology, the metal sector plays a critical role in sustaining present growth. The industry's increased competitiveness has hampered the development of numerous small-scale metal casting industries. A crucible made of local graphite can only be used not more than ten melting cycles. This research aims to examine the influence of firing temperature on the density, porosity, impact strength, and macrostructure of graphite, kaolin and castable cement crucible materials. This research applies experiment method at various firing temperature, i.e. 850 °C, 900 °C, 950 °C, 1000 °C and 1050 °C. The crucible materials are made of graphite, kaolin, and castable cement. The firing process employs a heating rate of 5 °C/min and a holding time 2 hours. The results show that firing temperature influences the density, porosity, impact strength and macrostructure of crucible. The highest density at 1.86 grams/cm3 was obtained at the firing temperature of 1050 °C. The lowest porosity value of 41% was attained at firing temperature of 1050 °C. However, this value was still below the crucible index criterion. The highest impact strength of 0.003249 Joule/mm2 occurred for firing temperature of 1050 °C.
Effect of Compaction Pressure and Sawdust Size on Briquette Made from Ulin Wood (Eusideroxylon Zwageri) and Gelam Wood (Melaleuca Cajuputi) to Combustion Characteristics Pratama, Bagus Harits; Syarief, Akhmad; Saputra, M. Reynaldi Perdana; Azis, Alif Putra
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.4

Abstract

In Kalimantan, gelam (Melaleuca cajuputi)  grows naturally in the swamp forest reaching 40 m with a diameter around 35 cm. Gelam wood is very resistant to acid soil in the swamp forest. Despite of it’s small diameter, gelam wood is very strong. This wood is usually used as the main house, as mold or mall support in casting concrete. Ulin (Eusideroxylon zwageri) is a typical plant of Kalimantan. In this study, the ignition duration, burning speed, and ash weight from briquette made from mixture of ulin and gelam sawdust was investigated. Size of sawdust used for briquette was varied for 40, 50, and 60 mesh while compaction pressure during briquette production was varied for 100, 125 and 150 kg/cm2. The study shows that the highest combustion temperature at 178 oC occurred for briquette with compaction pressure of 150 kg/cm2. Meanwhile, the lowest combustion temperature was obtained in briquette witch compaction pressure of 100 kg/cm2.
Software Simulation and Experiment for Production of a Pillow Block Using Sand Casting Process Raharjo, Rudianto; Widodo, Teguh Dwi; Bintarto, Redi; Azhar, Andika; Wibisono, Aryasatya Rafli; D, Dhimas Kaukabi
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.5

Abstract

Of many manufacturing processes, sand casting is one of the most widely used since there is no size limit of the workpiece. Big size product can be carried out at an affordable cost. In its process, sand casting comprises interconnected and complex series. If some of the processes are not properly carried out e.g. during solidification, will result in defects in the casting products. Simulation is an important method currently since it can model the entire metal casting process and show the dynamic character of the casting scheme. In this study, CAD is used for a 3D design on casting simulation. In this study, the grain size of molded sand, material quality and other process parameters were considered identical to all design schemes. This study aims to investigate the effect of varied design and dimensions of the gating system. It was found in this study that porosity and improper solidification were related to the improper gating and riser design.
The Effect of Variations in The Distance of the Expansion Valve with The Evaporator on the Performance of the Type Cooling Machine Split AC Alfian, Handi; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.6

Abstract

This research was conducted with the aim of finding the effect of variations in the distance of the expansion valve with the evaporator on the performance of the type cooling machine Split AC. The method used in this research was the experimental method. The variation used in this research were the variation of the distance between the expansion valve and the evaporator by 1 meter, 2 meters, and 3 meters (standard), then the value sought in this study were the room cooling rate and COP (Coefficient of Performance). Data collection in this study was repeated 15 times. From the results of data collection and the calculation process, the room cooling rate has increased compared to the standard distance variation, which were 3 meters, where the highest room cooling rate occurs at a distance of 1 meter variation of 0.0876 Kj/s, so the smaller the expansion valve distance from the evaporator, the smaller the expansion valve distance from the evaporator. room cooling rate increases, and vice versa. And for the COP results from variations in the distance of the expansion valve with the evaporator decreased from the standard distance variation of 3 meters, where the lowest COP occurred at a distance variation of 1 meter by 33.58, so the smaller the distance of the expansion valve with the evaporator, the COP of the cooling machine decreased and vice versa.
Effect of Firing Holding Time on Density, Porosity, and Hardness, Crucible Materials Based on Evaporation Boats Hidayat, Wakhid Muhlisin; Rusiyanto, Rusiyanto; Widodo, Rahmat Doni; Sumbodo, Wirawan; Fitriyana, Deni Fajar
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.1

Abstract

Evaporation boats are conductive advanced ceramic composites with the best thermal evaporation source for metalizing applications. The short life time of the evaporation boats causes the metalizing industry to produce large amounts of evaporation boats waste. However, studies on the utilization of evaporation boat waste are still limited. Therefore, this study aims to determine the effect of firing holding time on the density, porosity, and hardness of crucible materials made from evaporation boats waste. The material used in this research is a mixture of evaporation boats waste powder, kaolin, and graphite, with a composition of 50%, 25% and 25%, respectively. During the mixing process, 15% of the water is added. The compacting process carried out with a compaction pressure of 25 MPa. The firing process is carried out at a temperature of 1000oC with holding times of 60, 90, 120, 150, and 180 minutes. The test results show that the holding time of firing has an effect on density, porosity, and hardness. The highest density value was 1,91 g/cm3 at a holding time of 180 minutes, and the lowest was 1,77 g/cm3 at a holding time of 60 minutes. The highest porosity value is 4,10% at a holding time of 60 minutes, and the lowest is 2,16% at a holding time of 180 minutes. The highest hardness value was 12,84 HV at a holding time of 180 minutes, and the lowest was 8,3 HV at a holding time of 60 minutes. The longer holding time in the firing process results in a decrease in the porosity content. The decrease in the porosity content results in an increase in density and hardness of the cruicible specimens.
Study of Thermal Behavior in Mixed Scrap Tires (ST) And Polypropylene (PP) Plastic Using Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC) Sofana, Ilyas; Wijayanti, Widya; Hamidi, Nurkholis
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.7

Abstract

The world's rapid population growth, technological progress, and industrialization lead to an increase in fossil energy demand such as oil, coal, and natural gas. It is feared that this could lead to a scarcity of fossil energy in the future, therefore the use of alternative energy must be considered. One interesting concept to develop is waste to energy by utilizing plastic waste and also tires on vehicles. This is very possible because the two wastes contain elements of hydrocarbons which are also contained in fossil fuels so they can be processed to become alternative energy which can simultaneously reduce the population of the waste due to the increase in the world's population. This study aims to investigate the thermal behavior of scrap tires (ST) and polypropylene (PP) plastic using thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC). TGA thermogram showed that the feedstock samples were degraded in the temperature range of 331,97 oC to 448,08 oC. The interpretation of the DSC thermogram that showing information about the glass transition point and the melting point of the feedstock polymer will also be presented in this study.
Effect of Firing Holding Time on Density, Porosity, and Hardness, Crucible Materials Based on Evaporation Boats Hidayat, Wakhid Muhlisin; Rusiyanto, Rusiyanto; Widodo, Rahmat Doni; Sumbodo, Wirawan; Fitriyana, Deni Fajar
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.1

Abstract

Evaporation boats are conductive advanced ceramic composites with the best thermal evaporation source for metalizing applications. The short life time of the evaporation boats causes the metalizing industry to produce large amounts of evaporation boats waste. However, studies on the utilization of evaporation boat waste are still limited. Therefore, this study aims to determine the effect of firing holding time on the density, porosity, and hardness of crucible materials made from evaporation boats waste. The material used in this research is a mixture of evaporation boats waste powder, kaolin, and graphite, with a composition of 50%, 25% and 25%, respectively. During the mixing process, 15% of the water is added. The compacting process carried out with a compaction pressure of 25 MPa. The firing process is carried out at a temperature of 1000oC with holding times of 60, 90, 120, 150, and 180 minutes. The test results show that the holding time of firing has an effect on density, porosity, and hardness. The highest density value was 1,91 g/cm3 at a holding time of 180 minutes, and the lowest was 1,77 g/cm3 at a holding time of 60 minutes. The highest porosity value is 4,10% at a holding time of 60 minutes, and the lowest is 2,16% at a holding time of 180 minutes. The highest hardness value was 12,84 HV at a holding time of 180 minutes, and the lowest was 8,3 HV at a holding time of 60 minutes. The longer holding time in the firing process results in a decrease in the porosity content. The decrease in the porosity content results in an increase in density and hardness of the cruicible specimens.
Controlling Supplier Supply Stability with High Demand During the Covid-19 Pandemic at PT PQS Santoso, Sugeng; Anjela, Lia; Alvionita, Uci; Firmansyah, Firmansyah; Etlanda, Khoirul Akbar; Fatmawati, Ari Ana
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.2

Abstract

COVID-19 with a snap into a very influential factor in all sectors of the economy worldwide. The decrease in demand is also strongly felt in the manufacturing sector in Indonesia, even there are some factories were forced to have to lay off thousands of employees because it is not able to pay the salaries of employees. The opposite condition was experienced by PT PQS Indonesia, which experienced an increase in demand by 40% compared to the average demand for 6 months before COVID-19, because some of the company's branches in other countries had stopped production because they had to follow local government policies. Eventually all orders were sent to be produced at PT PQS Indonesia. The increase in demand does not mean that PT PQS Indonesia did not experience obstacles during the COVID-19 pandemic, the problem faced was the decline in delivery performance from suppliers, which impacted on the reduced stock of raw material stock and could even lead to production stops. This is because the suppliers were affected by Covid-19. This is a challenge because PT PQS has dozens of suppliers at home and abroad. To repeat this so that production does not stop, PT PQS Indonesia added a feature to help control supplier delivery performance. In 2018 the average delivery performance is only 60% — 70%, and the management target is 90% for local suppliers and 85% for overseas. This “Supplier Delivery Performance” feature really helps the procurement team to control the arrival of goods and provide information to suppliers related to their delivery performance, as well as being one of the index KPIs to evaluate supplier performance for one year before the Annual Vendor Meeting is held. To create a “Supplier Delivery Performance” index, PT PQS must also create SOPs or standardize them so that all relevant suppliers and procurement teams can easily understand them. 

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