Rekayasa Mesin
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia.
Rekayasa Mesin aims to provide a forum for national and 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 Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy.
All articles submitted to this journal can be written in Bahasa and English Language.
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<![CDATA[TEMPERATURE EXHAUST GAS ANALYSIS ON THE SHIP ENGINE ]]>
<![CDATA[Dwi Prasetyo]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.752
<![CDATA[Dual-fuel diesel engine is an engine with the use of two fuels in the combustion process to get labor on the engine. The types of fuels used include methane gas and marine gas oil fuels. Methane is produced from vapor cargo tank liquified natural gas. The purpose of this study was to determine what causes high exhaust gas temperatures on the performance of the dual-fuel diesel engine using the fault tree analysis data analysis method. From the analysis of the research data, several problems were formulated, namely, the factors that could cause high exhaust gas temperatures in the dual fuel diesel engine were the lack of combustion air supply in the engine combustion chamber, incompatible combustion composition between oil and gas fuel, and the engine room that is extremely hot. The impact caused is damage to the machining components and decreased performance of the dual-fuel diesel engine. To overcome the decrease in work on the dual fuel diesel engine is to carry out maintenance and repair on every component of the engine that has problems and damage in accordance with standard procedures.]]>
<![CDATA[ANALISIS SISTEM PENDINGIN MENGGUNAKAN THERMOSTAT DAN TANPA THERMOSTAT DALAM PENCAPAIAN PANAS MESIN PADA ALAT UJI PRESTASI ]]>
<![CDATA[Dafit Feriyanto]]>;
<![CDATA[Sagir Alva]]>;
<![CDATA[Resista Vikaliana]]>;
<![CDATA[Asep Setia Kristanto]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.757
<![CDATA[The ideal working temperature of the engine is about 82 - 93 ⁰C. The engine cooling system is needed to reach and maintain the ideal working temperature of the engine. The engine cooling system is equipped with a thermostat to regulate the flow of cooling water to reach and maintain the temperature. A malfunctioning thermostat will disrupt the cooling system process that led the engine can be overheated. This study aims to analyze the cooling system with and without a thermostat to achieve the ideal working temperature and evaluate the heat distribution on the engine cooling system in the Hyundai Arya diesel engine type D4BB. The research was conducted by various rotations of 800 rpm, 1500 rpm, and 2500 rpm, and the data was collected every 10 minutes. The cooling system without a thermostat can not reach the ideal working temperature of the engine within 10 minutes. Meanwhile, with a thermostat, the ideal working temperature of the engine can be achieved in 9 minutes with an average engine temperature of 86.0 ⁰C at 800 rpm, in 6 minutes with an average engine temperature of 83.5 ⁰C at 1500 rpm, and within 4 minutes with an average engine temperature of 81.7 ⁰C at 2500 rpm. The heat released by the cooling system without a thermostat is less than using a thermostat, with an average of 55.7%. The engine cooling system with a thermostat in the engine cooling system and precise engine temperature control will make the ideal working temperature of the engine more quickly achieved and can be maintained as long as the engine is operated.]]>
<![CDATA[THE LAYER HEIGHT VARIATIONS EFFECT ON TENSILE STRENGTH OF 3D PRINTING PRODUCT PLA MATERIAL BASED ]]>
<![CDATA[Sally Cahyati]]>;
<![CDATA[Yusuf Al Furqon]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.823
<![CDATA[3D Printing products are produced and used for many purposes like biomedical equipment, mechanical part, and so on. Therefore, mechanical properties are important for 3D Printing products. Layer height as one of the 3D Printing process parameters will be observed to know the effect on product tensile strength and printing time. The research has used ASTM D638 standard specimens from PLA material base with layer height parameter variations between 0.1mm, and 0.3 mm. The specimens are printed by 3D Print Creality Ender 3-Pro, then will be tested by Tensile Machine. The result finds both the printing time and the tensile strength of 3D printing products are affected by the variations in the layer height. The printing time will decrease along with the layer height increasing. For the layer height dimension nearly the nozzle diameter of 0.3 mm, the tensile strength is 10.16 MPa. It is significantly better than the 0.1 mm to 0.25 mm layer height which has a tensile strength range of 7.07 to 8.59 MPa. The condition is because the path internal bond in the 0.3 mm layer height has more homogeneity.]]>
<![CDATA[CO-PYROLYSIS OF SCRAP TIRES (ST) DAN PLASTIK POLYPROPYLENE (PP): DISTRIBUSI PRODUK DAN PROPERTIS FISIK PYRO-OIL ]]>
<![CDATA[Ilyas Sofana]]>;
<![CDATA[Widya Wijayanti]]>;
<![CDATA[Nurkholis Hamidi]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.952
<![CDATA[Plastic waste and scrap tires (ST) have now become pollution that harms the environment in various cities around the world if not managed properly. As pollutants, the two types of waste are actually very interesting to manage because they contain hydrocarbon elements so that they can be processed and have the potential to become alternative fuels. This study aims to determine the effect of co-pyrolysis of scrap tires (ST) and polypropylene (PP) plastic on the distribution of products in the form of oil and char/charcoal. The pyrolysis process was carried out at a temperature of 450℃ for 90 minutes using a fixed bed pyrolysis reactor with ST:PP mixing variations, namely 9:1, 8:2, 7:3, 6:4, and 5:5. The maximum pyrolysis product yield in the form of oil as much as 40.7 Wt% was obtained at a 6:4 mixing variation followed by a 7:3 (36.7 Wt%) mixing variation, then a 5:5 variant (36 Wt%), after that an 8:2 variant (34.3 Wt%) and the last is the 9:1 mixing variation with a total of 28.3 Wt%. For the maximum pyrolysis product in the form of char as much as 42.6 Wt% obtained at 9:1 mixing variation followed by 7:3 mixing variation (41 Wt%) after that 8:2 variant with 38.7 Wt%, then 6:4 with the amount of 27.7 Wt%, and the last is the mixing variation of 5:5 to obtain the char result of 18.3 Wt%. Physical properties of pyro-oil in the form of density and calorific value will also be shown in this study.]]>
<![CDATA[DESIGN AND EVALUATION OF CARABINER USING FINITE ELEMENT ANALYSIS ]]>
<![CDATA[Divlan Audie Sentanu]]>;
<![CDATA[Muhammad Akhsin Muflikhun]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.989
<![CDATA[A carabiner is a fall protection safety tool that is used in various outdoor and indoor activities, most known usage is at climbing and high-risk work related to elevation. A standard carabiner is capable to withstand at least 7 kN of static load. In this study, we only observe how carabiners respond in certain static loads by using simulation software and comparing the result with the standard of carabiners. We use F1956-13 as a standard of the test procedure, and aluminum alloy 6061 as the material. After the study from simulation result, it shows that stress and deformation change linearly with loads. But the safety factor has different behavior, after the load applied increases over 1 kN the slope decreases significantly, and the safety factor is around 0,17 at 7 kN applied load. Besides that, we understand that design analysis by simulation is a good method to obtain the optimal geometry, or shape of the model, but computational simulation cannot replace physical mechanical tests.]]>
<![CDATA[DESAIN KONTROL ROBOT MANIPULATOR KAPASITAS 1.25 kgf ]]>
<![CDATA[Sirojuddin Sirojuddin]]>;
<![CDATA[Yudha Adigutama]]>;
<![CDATA[Eko Arif Syaefudin]]>;
<![CDATA[Mohamad Ilham Al Fatah]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.997
<![CDATA[A robotic manipulator is one type of popular industrial robot which has a shape and movement that resemble a human arm. Robotic Manipulator mainly consists of a base, arm, gripper, and control system. This research focused on the control aspect of robot manipulators to handle 1.25 kgf load through experiment as a model of the robot with inverse kinematics. The design of the robot control uses 5 degrees of freedom using a servo motor as its actuator to achieve an accurate and stable movement on its x, y, and z coordinates using a microcontroller to calculate the inverse kinematic in real-time. The robot’s control involved the kinematic system, control diagram, microcontroller, and robot programming. From the experiment, it was found that the robot manipulator was able to grip and move an object from one coordinate to another position accurately and stable with a deviation in each axis were 2-3 mm on the X, 2 mm on the Y, and 1-3 mm on the Z. As for the movement timeframe deviation that was obtained between the programmed and measured was o seconds.]]>
<![CDATA[PRODUCTION OF BIODIESEL FROM CORN AND COCONUT OIL WITH LOCALLY JEMBER INDONESIA VEGETABLE OIL: An optimization of biodiesel parameters ]]>
<![CDATA[Azamataufiq Budiprasojo]]>;
<![CDATA[Alex T. Zain]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.1074
<![CDATA[In this study, experimental trials will be carried out to find out the optimal recipe for processing corn oil and biodiesel oil produced by UMKM in Jember Regency (Indonesia) into biodiesel known as biosolar. Experimental conditions will be optimized to obtain partial transesterification of coconut oil and corn oil using a variety of common methoxide for the production of biosolar. Biosolar production using conventional methods has not yet produced fuel that meets modern engine standards, further research is needed to overcome this problem, including by making an advanced processing method. The following experimental parameters will be varied : liquid temperature (40-60ºC), processing time (1800 to 3600 sec.), catalyst (0.5-1,25 % of total weight.), and proportional of methanol oil mix ratio (m/o) (1:3-1:6). The maximum value parameter of biodiesel reaching 98.12% was produced by methoxide from KOH at 60 minutes of process, in 60 oC temperature and an oil – methanol mix ratio of 1:0.25. The optimal conditions for biosolar production also with biosolar fuel properties varied catalysts were tested with the standard methods of 14214EN and ASTMD6751. The results showed that optimum catalysts for biosolar production using coconut oil and corn oil are 0.8 % of total weight of either KOH and NaOH catalyst.]]>
<![CDATA[PERFORMANCE SIMULATION ON THE SHELL AND TUBE OF HEAT EXCHANGER BY ASPEN HYSYS V.10 ]]>
<![CDATA[Erlinda Ningsih]]>;
<![CDATA[Isa Albanna]]>;
<![CDATA[Aita Pudji Witari]]>;
<![CDATA[Gistanya Lindar Anggraini]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.1078
<![CDATA[Heat exchanger type shell and tube, which is the most commonly used heat exchanger in various industries. The efficiency of heat exchangers can be seen from their performance to affect its economy from a process. The purpose is to determine the influence of the hot fluid flow rate and the cold fluid on the overall heat transfer coefficient (U) and log mean temperature difference (ΔTLMTD) values. This simulation is done using Aspen HYSYS V.10 applications and obtained data of the total heat transfer coefficient (U) and ΔTLMTD values. The heat exchanger shell and tube used type 1-2 with single segment type 4 baffle, triangular tube layout, and shell length 1000mm. This simulation results in a hot fluid flow rate compared to reverse with the overall heat transfer coefficient and a cold fluid relative to the overall heat transfer coefficient, with the two best fluid flow rates at 2100 kg/h hot fluid and 1800 kg/h cold fluid at 10400 Kj/oC.h. The influence of the hot fluid flow rate on ΔTLMTD is relative to the straight, while the cold fluid flow rate is relative to the reverse, with the value of the second-best fluid flow rate at the 2100 kg/h hot fluid and the 1800 kg/h cold fluid at 26.25oC]]>
<![CDATA[PERANCANGAN TEKANAN UDARA POSITIF PADA KABIN MOBIL MSSC (MOBILE SWAB SAMPLING CHAMBER) ]]>
<![CDATA[Fahmi Rais]]>;
<![CDATA[Radhian Krinsnaputra]]>;
<![CDATA[Sugiyanto Sugiyanto]]>;
<![CDATA[F.X. Sukidjo]]>;
<![CDATA[Stephanus Danny Kurniawan]]>;
<![CDATA[Isworo Djati]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.1087
<![CDATA[MSSC (Mobile Swab Sampling Chamber) car should have a fulfilling requirement as a protective isolation room or positive pressure room. A positive pressure room is needed so the virus or bacteria that is carried by the patient outside the car could not enter and contaminate the medical officer inside the car. Based on that need, the MSSC car is designed so that it can be used as a swab test sampling and having a positive pressure. The designing process was started by assembling each part of the car cabin that was used as an examination tool and positive pressure maker. This design was then simulated using the CFD method to find out whether the car cabin design produces positive pressure. The velocity of the AC blower and the percentage of exhaust openings were varied so that suitable air pressure was obtained. Based on the analysis of the simulation results, it was known that the design of the car cabin that had been done could produce positive air pressure. This positive air pressure was obtained when the blower speed was low and the exhaust opening was 100%. The value of air pressure under these conditions was 101019 Pa or +19 Pa from the ambient air that have 101000 Pa in Yogyakarta.]]>
<![CDATA[PENGARUH PENCAMPURAN MINYAK TANAH DENGAN BAHAN BAKAR MINYAK DIESEL, BIODIESEL DAN LAINNYA - REVIEW ]]>
<![CDATA[Annisa Bhikuning]]>;
<![CDATA[Muhammad Hafnan]]>;
<![CDATA[Jefa Danar Indra Wijaya]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v13i3.1090
<![CDATA[The use of diesel oil has been proven to increase exhaust emissions which will have an impact on the environment. Mixing diesel oil with other fuels can reduce exhaust emissions and increase combustion efficiency. This article discusses the review of mixing kerosene with diesel oil and biodiesel. The method was the fuel are running in the diesel engine and calculated the performance and emissions in the engine. The fuel properties of mixing kerosene with diesel oil and biodiesel can reduce the level of viscosity and specific gravity of the fuel and increase the calorific value which will have an impact on improving the atomization in combustion. In addition, mixing diesel oil and kerosene can reduce emissions such as CO2, CO, HC, particulate, and opacity. However, mixing kerosene with biodiesel can increase NOx emissions. In addition, the addition of kerosene in diesel oil can lead to low fuel consumption in diesel oil. The addition of kerosene with biodiesel will increase thermal efficiency. Therefore, it can be concluded that the addition of kerosene into diesel oil and biodiesel can improve engine performance in the engine and reduce some exhaust emissions.]]>
