Jurnal Rekayasa Mesin 2022-06-05T02:49:57+00:00 Prof. Ir. Djarot B. Darmadi, M.T., Ph.D Open Journal Systems <p><strong>Rekayasa Mesin</strong> is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. <strong>Rekayasa Mesin</strong> is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. <strong>Rekayasa Mesin</strong> accepts submission from all over the world, especially from Indonesia.</p> <p><strong>Rekayasa Mesin</strong> 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.</p> <p>The scope of<strong> Rekayasa Mesin </strong>is <strong>specific topics issues </strong>in mechanical engineering such as design, energy conversion, manufacture, and metallurgy.</p> <p>All articles submitted to this journal can be written in <strong>Bahasa and English Language</strong>.</p> <p><strong>Rekayasa Mesin</strong> has been indexed in <a href="" target="_blank" rel="nofollow noopener"><strong>Directory of Open Access Journals</strong> <strong>(DOAJ)</strong></a>, <strong><a href="" target="_blank" rel="nofollow noopener">SINTA</a></strong>, <strong><a href=";hl=en" rel="nofollow">Google Scholar</a></strong>, and <a href="" rel="nofollow"><strong>Garba Rujukan Digital (GARUDA)</strong>.</a></p> <p><strong>Rekayasa Mesin</strong> has been nationally <strong>reaccredited</strong> by the Ministry of Research and Technology/National Research and Innovation Agency of the Republic of Indonesia (Volume 11 No 2 2020 - Volume 16 No 1 2025) and indexed in <strong>SINTA 2.</strong></p> <p>Decree No. <strong>200/M/KPT/2020 on December 23rd<strong>,</strong> 2020</strong></p> <p><strong>P-ISSN </strong><a href=";1367289641&amp;1&amp;&amp;" target="_blank" rel="nofollow noopener">2338-1663</a><strong> </strong>|<strong> E-ISSN </strong><a href=";1447652519&amp;1&amp;&amp;" target="_blank" rel="nofollow noopener">2477-6041</a> |<strong><strong> </strong>DOI prefix </strong><a href="" target="_blank" rel="nofollow noopener">10.21776/ub.jrm</a></p> PERFORMANSI POMPA INJEKSI BAHAN KIMIA PADA ANJUNGAN WEST STUPA 2021-08-18T07:35:00+00:00 Budha Maryanti Rian Indra Saputra <p>The West Stupa Pavilion is one of the offshore platforms of TOTAL E&amp;P Indonesie which operates in the oil and gas sector in Indonesia. In the production process at the West Stupa platform, there is a pneumatic pump which is useful for injection of corrosion inhibitor chemicals for pipe flow, corrosion inhibitor pumps using a plunger pump type. Corrosion inhibitor pumps have a controlled-volume function, where the normal injection rate is 0.5 L / MMSCF. Where the West Stupa ridge system is a state asset and a company asset, it must be maintained. The stability of the injection of existing chemicals still needs to be re-evaluated in order to achieve a stable injection system and maximize the function of chemicals. The research was conducted at the West Stupa Pavilion, South Mahakam field, the work area of ​​TOTAL E&amp;P Indonesie in East Kalimantan. The research is a calculation of the total head of the chemical injection pump using a working pressure simulation method with fluid in the form of EPT2300 and KI3063 which have different SG (Specific Gravity). The results showed that the performance of the chemical injection pump at the West Stupa platform after being calculated to have the highest total head of 402.02 m at the EPT2300 the amount of flow was 52 liters/day and 373.5 m at KI3063 the amount of flow was 49 liters/day with Performance percentage was 7.1% greater when pumping EPT2300 chemicals. Therefore, it is advisable to carry out periodic checks on the internal components of the pump if you want to pump KI3063 chemical with higher specific gravity.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Budha Maryanti, Rian Indra Saputra PERFORMA DESALINASI AIR LAUT TENAGA SURYA TIPE WICK METODE KAPILER 2021-12-20T08:11:26+00:00 Siska Rutami Manafe Ben V. Tarigan Arifin Sanusi <p>How to get clean water using the seawater desalination process into pure water in coastal communities. Basin is a sea water desalination tool in the form of a tub or bowl to hold sea water. The basin used in this study was shaped like a tub using a cover made of glass with a thickness of 0.003 m, a slope of 25o and consisted of two types of basins in which one consisted of three levels and the other two levels. From the test results with the variation of the cover glass distance and level variations in the basin showed that the productivity of pure water at the distance of the glass cover 0.105 m basin three levels more is 416 ml while at the distance of the glass cover 0.11 m the productivity of pure water in the basin was two levels more which is 450 ml. The most pure water productivity found in the distance of 0.11 m cover glass, either a three-level basin or a two-level basin with a total pure water productivity of 667 ml. Whereas in the variation in the number of levels in the basin, pure water productivity found in the two-level basin, 450 ml with a desalination efficiency of 26.07%.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Siska Rutami Manafe KARAKTERISTIK MATERIAL KOMPOSIT BERBASIS BATUAN BASALT DAN DROSS AL 2022-03-23T12:22:31+00:00 Muhammad Al Muttaqii Fauzul Kurniajaya Agung Efrio Hadi <p>Basalt is one of the basic igneous rocks formed from the freezing process of magma on the earth's surface and has a very good grain size. This study aims to determine the characteristics of the composite basalt as initial data for the manufacture of brake linings. In this study, basalt was made into a composite with the composition of basalt and dross Al of 45:30%, 55:20%, 65:10% and polyester resin 25%. The material used has particle sizes of 100, 150, and 200 mesh. The materials were made by mixing for 5, 10, and 15 min. Then carried out the compaction process with a load of 2 tons with a holding time of 5 min. Next, the material was sintered at 150 <sup>o</sup>C for 2 h. The characteristics studied were compressive strength referring to ASTM D695-15 and Absorption referring to SNI 03-2105-2006. From the results of composite testing, the best characteristics were found in specimen 3, with a compressive strength value of 113.616 MPa and Absorption of 1.39%.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Muhammad Al Muttaqii KARAKTERISASI PENGECORAN POROS BERULIR (SCREW) DENGAN VARIABEL PADUAN UNSUR TITANIUM BORON DAN MAGNESIUM 2022-01-06T23:36:04+00:00 Andika Wisnujati Mirza Yusuf Azhar Hudiatma <p>Aluminum is a non-ferrous metal that is widely used in everyday life, both on a large and small industrial scale as well as a household scale. In this research, used diesel motor piston material for casting screw. The addition of 0.1%, 0.3% Titanium Boron (Ti-B) and 0.1%, 0.3% Magnesium (Mg) for screw making by casting is expected to improve the physical and mechanical properties of the material. Tests carried out in this research are to wear testing and microstructure. The analysis of the results of this wear test shows that the aluminum alloy for making screws with the addition of 0.1% Titanium-Boron (TiB) and 0.1% Magnesium (Mg) has a better wear resistance, which is 1.154 mm² / kg compared to the addition of the element 0.3% Titanium-Boron (TiB) and 0.3% Magnesium (Mg) and without the addition of any elements which have wear resistance values of 1.252 mm² / kg and 1.596 mm² / kg, respectively. Microstructure testing shows the grain structure in aluminum alloy from casting results with the addition of Ti-B and Mg elements getting smaller and denser. This proves that the more elements of Ti-B and Mg added to the casting of aluminum alloys, the smaller the structure of the grain will be and will affect the mechanical properties of the screw.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Andika Wisnujati, Mirza Yusuf PERANCANGAN SISTEM DIAGNOSIS GETARAN MOTOR MENGGUNAKAN JARINGAN SARAF TIRUAN PROPAGASI MUNDUR 2022-01-06T23:28:09+00:00 Dedik Romahadi Dafit Feriyanto Wiwit Suprihatiningsih Wahyu Nur Setiawan <p>Expert system design is an effective and sophisticated way of diagnosing a fault in a 12 kW DC Motor. This study aims to design an ANN system to determine damage to the motor. The research method uses spectrum data from the vibration analyzer which is collected based on different types of damage. The training data patterns from the spectrum characteristics to be used in the system, the goal is that the systems can recognize the patterns that have been made. The training data patterns that have been successfully recognized by the system are then tested. The results of training and ANN testing are quite good, with the greatest Cross-Entropy value of 9.94, having 0% error value, the largest Mean Square Error value 8.33e-6 and the smallest regression 0.998. A testing of 8 new spectrums resulted in accurate predictions.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Dedik Romahadi, Dafit Feriyanto, Wiwit Suprihatiningsih, Wahyu Nur Setiawan AC CHOPPER DESIGN AS UNIVERSAL MOTOR DRIVER BASED ON FUZZY LOGIC CONTROLLER 2021-08-28T13:18:36+00:00 Widjonarko Widjonarko Andi Setiawan Ardhiansyah Ilhami <p>The electric motor has the function is converting electrical energy into mechanical energy. Based on supply, the electric motor is divided into two kinds of supply that are alternating current and direct current. The universal motor is an alternating current motor, the construction, and characteristics of a universal motor are the same as a direct current motor. Fuzzy Logic Controller is combined with AC Chopper circuit as a universal motor driver to control the motor universal speed at the stability of 1000 RPM and uses LM393 Optical Encoder sensor that will give a feedback signal to the fuzzy system as input. This research purpose is to implement AC Chopper as a universal motor driver to get more stable speed control combined with Fuzzy Logic Controller as feedback. In this study, the author uses the experimental method. With variable control are setpoint at 50% duty cycle and 1000 RPM speed reference of motor universal. Which is using 10 types of duty cycle values to get the average of driver efficiency and then using 2 kinds of load conditions for the controller test. The result of the driver test is to get speed control while without load condition has a period of 3 – 5 seconds to reach 1000 RPM. Then, when the load shedding condition has an overshoot value of up to 1193.33 RPM and reaches 1000 RPM in the range of 2 - 3 seconds. In this study, got the result of average driver efficiency is 85.41%.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Widjonarko Widjonarko, Andi Setiawan, Ardhiansyah Ilhami IDENTIFIKASI PENYUMBATAN ALIRAN AIR PADA PIPA DENGAN METODA GETARAN 2021-10-13T12:20:15+00:00 Subekti Subekti Agung Wahyudi Biantoro Abdul Hamid Sutanto Sutanto Khairul Azis <p class="Abstract">The piping system design due to pressure will experience vibrations due to the excitation force that comes from the pump. Excitation force occurs due to changes in fluid flow velocity. In addition, the length of the pipe and the large number of bends of the pipe due to cross with other installations, cause vibrations in the pipe. vibration analysis in the pipe should not be underestimated, where it is necessary to identify the causes of vibration in the pipe due to flow and placement of good support and the effect of obstacles in the pipe flow to prevent failure of the pipe. In addition, clogging of pipelines can result in reduced system carrying capacity, wastage of energy and resources, and the potential for increased likelihood of environmental and health problems. Therefore, this study will discuss the identification of blockage of water flow in pipes using the vibration method. The excitation force comes from the fluid flow flowing in the pipe, while the vibration response is generated using the accelerometer sensor provided with the FFT Analyzer. Retrieval of data using the accelerometer as a vibration sensor served by Ono Sokki's FFT analyzer which is then analyzed using Matlab. Installation with four supports shows that the resonance that occurs in the installation of two supports can be reduced, but it causes the magnitude of the iron pipe to increase, while the PVC pipe decreases at a frequency of 5 Hz. In general, the result of installing four supports shows that the noise on the PVC pipe is reduced while the iron pipe is getting higher due to the installation of a barrier in the pipe due to water flow. The vibration pattern that occurs uses a harmonic response simulation, the vibration pattern that occurs uses a harmonic response simulation.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Subekti REKONSTRUKSI TULANG LUTUT MENJADI MODEL 3D IMPLAN FEMUR DENGAN METODE REVERSE ENGINEERING BERBASIS PEMINDAI X-RAY 2022-01-06T23:24:22+00:00 Feny Setiawan Suryadiwansa Harun Yanuar Burhanudin <p class="Abstract">In order to obtain the geometry and size of bone implants that match the patient's original bone from this study, the patient femur knee bone is reconstructed into a 3D femur implant model using an X-Ray data scanner during Reverse Engineering (RE) process. In the process of RE, the femur knee bone was initially reconstructed by scanning its front and side view into a photo using the digital radiography system. For building a 3D model of the femur implant, the front and side view of the knee bones are sketched according to the dimensions and shape of the scanned femur knee bones. Then, one of the sketches is defined as the sketch profile of the femur knee bone, while the other is the trajectory profile. 3D modeling of the femur implant was constructed by using the sweep method in 3D design software. The results of this knee reconstruction obtained a 3D model of the femoral knee bone implant that is following the patient's bone shape.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Feny Setiawan, Suryadiwansa Harun, Yanuar Burhanudin PENGARUH GEOMETRI SUDU INLET BAGIAN TIP DAN HUB TURBIN PROPELLER PADA UNJUK KERJA ALIRAN HORISONTAL 2021-08-02T09:56:58+00:00 Dwi Aries Himawanto Hasan Bisri Akhmad Nurdin <p>Potential of Indonesian hydropower which has only been utilized 9% has been concern of many researchers. Hydro power, especially on streams with Ultra Low Head (ULH), has become a trend of current research as renewable energy in reducing the energy crisis as a pico scale power plant. ULH which is often identified with horizontal flow can be utilized well with reaction type turbines, which are often used are propeller turbines. Propeller turbines that have high efficiency still need to be investigated and developed in order to produce better output power, especially in horizontal flow. Modification of experimental blades at inlet section of tip and hub of blade is an effort to increase the output power of propeller turbine. Inlet tip angle variations are 19°, 23°, 29°, and 36°, while inlet hub angle variations are 33°, 36°, 40°, and 44° by being tested at a discharge of 13 l/s. This study aims to determine the effect of inlet angle of tip and hub of blade on the performance of turbine on horizontal flow in pipe. The highest results in use of 23° inlet tip and 33° inlet hub are 17.4 watts of electrical power and 50% efficiency.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Dwi Aries Himawanto PENGARUH KETINGGIAN DAN SUDUT KEMIRINGAN SALURAN AIR TERBUKA TERHADAP PARAMETER ALIRAN DAN PUTARAN TURBIN VORTEX 2021-12-02T09:47:29+00:00 Yosafat Didik Febriyanto Samsudin Anis <p>The stream parameter was affected by the height of falling, water debit and head losses. The stream that had straight flow could be converted to vortex stream using shapping drain. The movement of the vortex stream could be converted to mechanical energy using vortex wheel. The aim of this study was to find out the effect of the height and angle in exposed water drain in stream parameter and the spinning of vortex wheel. This study used type U water drain which has different variation of height 50 mm, 80 mm, 110 mm, 140 mm, and 170 mm and different angle variation 20, 25, and 30. The stream parameter was obatined by measuring the stream surface. Furthermore, the spinning of the vortex wheel was measured using tachometer. The result of this study showed that the spinning of the vortex wheel has the highest point at 100 mm in height variation and 30 in angle variation, which has 142.85 rpm in spinning speed, 1.178 m/s in stream speed, and 102.5 mm water height in vortex in average. It was because the higher and bigger the angle, the faster the stream was. However, a high speed of the stream produced small vortex stram. It caused the area of the water to hit in temperature to decrease so that the spinning of the wheel decreased.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Yosafat Didik Febriyanto ANALISIS ENGINE PROPELLER MATCHING PROPULSI KAPAL IKAN TRADISIONAL DENGAN PTO GENERATOR 2021-12-18T14:23:08+00:00 Mohammad Abu Jamiin <p class="Abstract">This paper presents an analysis of power take off (PTO) generator connected to main engine and its effects to engine overload and ship speed. The purposes of research is to determine the safe operation of PTO generator by adjusting the ship speed. The PTO generator is a generator coupled with main engine to drive a cooling machine. The analysis of engine propeller matching method is used to determine the working points of ship propulsion coupled with PTO generator. The results of simulation show that the output power of main engine decreases by 8.4% of maximum continuous rating (MCR) point with the maximum speed is 5.4 knots. When it is connected to PTO generator, the output power of main engine does not decrease. It can be operated to MCR point with the maximum speed is 5.1 knots.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Mohammad Abu Jamiin RANCANG BANGUN DAN KARAKTERISASI FEEDING MECHANISM SILIKONE BERBASIS SYRINGE PUMP PADA 3D PRINTER 2021-12-20T09:50:59+00:00 Axel Leonardo Arka Dwinanda Soewono Marten Darmawan <p class="Abstract">Additive Manufacturing as one of the methods used on a 3D Printer can be applied with silicone as its material by designing a feeding mechanism based on a syringe pump which considers its mass flow rate. The purpose of this experiment is to produce the design of a feeding mechanism and to know the correlation between stepper motor torque (Tsm) and CNC travel feed rate (VCNC) with mass flow rate. The geometry which will be reviewed is a line. Those parameters will be characterized by measuring the width of the line (x) on the desired nine measured points. The most stable mass flow rate on stepper motor torque is determined by the smallest difference between average line width, while the most stable mass flow rate on CNC travel feed rate is determined by the smallest deviation standard between each measured points. The characterization results show that the smallest stepper motor torque value has the smallest difference between the average line width, which is 1,92 mm; while the highest stepper motor torque value has the highest difference between average line width, which is 3,66 mm and the highest CNC travel feed rate has the smallest deviation standard, which is 0,91; while the smallest CNC travel feed rate has the highest deviation standard, which is 2,14. Both of the statements imply that a smaller amount of the stepper motor torque and a higher amount of CNC travel feed rate will induce a more stable mass flow rate, it also works the other way around.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Axel Leonardo, Arka Dwinanda Soewono, Marten Darmawan THE EFFECT OF VARIATION OF ZEOLITE AS ADSORBENT MEDIUM AND ADSOPTION PRESSURE TOWARD THE QUALITY OF OXYGEN PRODUCED FROM PRESSURE SWING ADSORPTION (PSA) 2021-12-06T09:19:41+00:00 Dhimas Satria Teguh Kurniawan Nidya Jullanar Salman <p>One of the most important element in human life is oxygen. To produce good quality of oxygen, a purification process is needed. Pressure Swing Adsorption with the adsobent of zeolite is the most comon method used for oxygen purification. This study aimed to find out media variation of of zeolite as adsorbent medium and adsoption pressure toward oxygen quality produced from PSA. Variation of adsrobent medium used were 13X zeolite and combination of 13X zeolite and Bayah zeolite (zeolite 13X+ZAB). The study result shows that the use of 13X zeolite and 13X+ZAB zeolite can significanly increase the quality of oxygen in PSA compare to without using zeolite. The use of 13X zeolite produce higher quality of oxygen, this is because 13X zeolit is a zeolite which has high ability to adsorb nitrogen and 13X zeolite has high surface area. The higher the adsorbent surface area the more adsorbat was adsrobed so that 13X zeolite will adsorb niotrogen. Meanwhile the addition of Bayah natural zeolite into 13x zeolite (13X zeolite +ZAB) is to overcome the problem of the vapor releasing which can hinder the performance of PSA in certain period of time, so that it is needed one media of adsorbent of natural zeolite which can adsorb liquid produced from this PSA. The effect of pressure variation toward oxigen quality produced from PSA is that the higher the pressure applied the faster the process of lowering the quality of oxygen would be, this is because the adsorben was more saturated. The pressure highly affect the adsorbability occur in PSA colomn. </p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Dhimas Satria THE EVALUATION OF MESH CHARACTERISTICS OF THE CAR MODELING AND SIMULATION USING CFD ANALYSIS 2021-12-22T16:54:31+00:00 Muhammad Akhsin Muflikhun Hifni Muktar Ariyadi Alfian Muhammad Fadhillah Hidayat <p class="Abstract">In a car CFD simulation, different types of mesh could change the output of the simulation and may differ with the results gathered using wind tunnel experiment. Therefore, adjusting and getting the best mesh for the simulated car model is an important step in a CFD simulation. This study investigated the effect of the different number of elements on a saloon car CFD simulation. The elements themselves have a similar mesh quality, but the number of elements ranged from just over a couple hundred thousand to over 3 million elements. The results show that with this number of mesh, the accuracy did not increase significantly even though the elements multiplied in amount. It is suggested that simulation with higher number of elements might be the best choice if the facilities are supportive. It is also shown that the lower number of elements could be an alternative because the accuracy is sufficient.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Muhammad Akhsin Muflikhun, Hifni Muktar Ariyadi, Alfian Muhammad Fadhillah Hidayat ANALYSIS OF FUEL OIL SUPPLY CHAIN RISK MANAGEMENT AT JATINEGARA LOCOMOTIVE DEPO 2021-12-18T14:42:18+00:00 Karunia Burhan Pramudhita Sugeng Santoso <p class="Default">PT. Kereta Api Indonesia (Persero) or PT. KAI is one of the State-Owned Enterprises which is engaged in inland transportation, namely trains. In the process of providing transportation services, PT. KAI requires a continuous supply of fuel oil. In the operation of the fuel supply chain, PT. KAI has potential risks such as losses and several other risks that can harm the company. From these problems, this research tries to conduct a risk analysis by applying the ISO 31000 risk management framework to determine the effectiveness of PT. KAI in managing fuel supply chain risks. The distribution of subsidized fuel has been implemented before 2012 by PT KAI is the loco scheme, where a high level of potential risk is found outside the risk tolerance limit so that PT. KAI responds to this problem with risk transfer. Where is PT. KAI tries to take risks by using third-party services to provide and manage fuel for train operations' consumption needs.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Karunia Burhan Pramudhita, Sugeng Santoso DESAIN DAN ANALISIS NUMERIK RUANG BAKAR BRIKET SAMPAH ANORGANIK UNTUK PENGAPLIKASIAN PADA MIKROTURBIN GAS 2021-12-20T09:49:41+00:00 Erlanda A Pane Eko Prasetyo Rudi Hermawan David H Gouwin <p>The utilization of briquettes as a source of electricity generation is still low due to the briquette characteristics that have high moisture content. This research analyzes the briquette's potential as a source of electrical energy by utilizing its syngas with microturbine gas. The high quality of syngas can be reached by the optimal combustion chamber design. Therefore, the research aim is to be able to design the optimum combustion chamber for the briquette combustion process to generate the syngas. This research method uses two steps, i.e., the design of the combustion chamber and numerical analysis of the briquette combustion process through Computational Fluid Dynamics (CFD) simulations. Numerical analysis of the combustion process using three types of briquettes with different inorganic waste compositions, i.e., K1 type, K2 type, and K3 type. The research results explain the optimum design of the combustion chamber with a total length dimension of 220 mm, an inlet fuel section, and combustion chamber-syngas pipeline diameter of 50 mm and 75 mm, respectively. In addition, the dimensions of the primary air holes are 7 mm, and the secondary air holes are 5 mm. Type K1 briquettes are capable of producing syngas (kg/s) consisting of 6.9x10<sup>-13</sup> CO, 3.04x10<sup>-31</sup> H<sub>2</sub>, and 1.8x10<sup>-20</sup> CH<sub>4</sub>. That syngas composition includes in the criteria of syngas in the microturbines gas that produce electric power of 2.3-2.5 kW. The conclusions explain that the combustion chamber can be added to the microturbine gas component, and K1 type briquette can be a solid fuel.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Erlanda A Pane, Eko Prasetyo, Rudi Hermawan, David H Gouwin PENGARUH FREKUENSI GETARAN TERHADAP SIFAT FISIS DAN MEKANIK PADA SAMBUNGAN LAS MIG ALUMINIUM PADUAN AA 6061-T6 2021-12-20T08:29:33+00:00 Anggit Widodo Mochammad Noer Ilman <p>AA 6061-T6 aluminium alloy is one of the 6xxx series that is widely used in engineering, especially automotive, aircraft, piping, and shipbuilding industries because it has many advantages. Despite AA 6061-T6 has a relatively good weldability, the strength of the weld joints is lower compared to its AA6061-T6 base metal. Therefore, this study aims to improve mechanical properties of metal inert gas (MIG) welded AA 6061-T6 aluminium alloy plates such as hardness and tensile strength by introducing engineering vibration during welding at a frequency of 100 Hz. The MIG welding process was conducted using current (I), voltage (E) and welding speed (v) of 120 Ampere, 20 Volt and 12 mm/minute respectively with filler metal used was ER5356. Results showed that the ultimate tensile strength of the weld joints increased under vibrational treatment with the tensile strength achieved 172.02 MPa which was 49% higher compared to conventional weld joint. The higher strength of the vibrated weld joints could be linked to the weld microstructure which consisted of fine grained equiaxed-dendritic structures.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Anggit widodo ANALISIS PERFORMA KARBON AKTIF KULIT BAWANG MERAH (ALLIUM CEPA SKIN) TERHADAP PERUBAHAN KARAKTERISTIK LIMBAH AIR ACCU 2022-01-08T12:10:21+00:00 Wisnu Kuncoro Ikhwanul Qiram Gatut Rubiono <p>Onion peel is one of the solid waste produced either from the onion processing industry or waste from household waste. Onion skin contains cellulose compounds that are quite high, which is 41-50% as well as aromatic compounds. It is underlying that onion skin can be used as a raw material in the manufacture of activated carbon. One of the uses of activated carbon is as an adsorbent in the conditioning of pH and TDS levels in battery water waste. The manufacture of activated carbon is carried out with 3 main stages, namely carbonization with a temperature of 400<sup>o</sup>C for 1 hour, sorting particle sizes of 10-16 mesh and 60-200 mesh, and variations of NaOH activators of 10%, 15%, and 25%. Other variations used in the study included the use of 12V/100W floodlights in the purple, yellow, and no lighting spectrum, as well as an active carbon mass of 0.5 and 1 gram. The best adsorption rate is obtained with variations in activated carbon 60-200 mesh, activated carbon mass against a solution of 1 gram, and with purple lighting with a wavelength of 380-450 nm where the initial pH 2 and final pH of 4.8 and TDS decreased by 180 Ppm where the initial TDS is 9,690 Ppm and the final TDS is 9,510 PPM and has the potential to produce hydrogen.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Wisnu Kuncoro RANCANG BANGUN ALAT KONVERSI PLASTIK MENJADI BAHAN BAKAR MINYAK DENGAN METODE PIROLISIS UNTUK PENANGANAN SAMPAH PLASTIK 2021-12-30T10:40:16+00:00 I Gusti Ngurah Nitya Santhiarsa <p class="Abstract">The volume of plastic waste is increasing day by day, due to the lack of management technology and plastic is a non-biodegradable material. Plastic waste causes pollution to the environment and living things if left alone. Various efforts have been made to deal with plastic waste, but only cause other problems such as blockage of water flow. This research introduces the technology of converting plastic waste into fuel oil called pyrolysis. Pyrolysis is a method of converting plastic into fuel oil through a thermal decomposition process in the absence of oxygen. The purpose of this study was to determine the weight of oil produced in the pyrolysis process with variations in condenser temperature. The type of plastic used is LDPE, the reactor temperature is constant at 200° C. The pyrolysis process was carried out for 1 hour for each condenser temperature variation at 28° C, 14° C, and 4° C. Based on the research results, the condenser temperature variation at 28° C gets the lowest oil weight, which is 17 grf, while the condenser temperature variation at 14° C produces 32 grf of oil weight, and the highest oil weight is obtained at 4° C condenser temperature variation of 62 grf.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 I Gusti Ngurah Nitya Santhiarsa ANALISIS PENGARUH KONDUKTIVITAS IONIK MATERIAL ELEKTROLIT PADA KINERJA SOLID OXIDE FUEL CELL 2021-12-02T09:53:13+00:00 Fahrizal Perdana Fahmul Mega Nur Sasongko <p class="Abstract">SOFC electrolytes are known for their ohmic resistance aspect, which is dependent on temperature. Using COMSOL Multiphysics numerical simulation, analysis of SOFC power performance with yttria-stabilized zirconia (YSZ) and lithium sodium carbonate – gadolinium-doped ceria ((LiNa)<sub>2</sub>CO<sub>3</sub>-GDC) electrolytes was conducted to inspect the performance of these electrolytes in their application in SOFC. The ionic conductivity of YSZ was differentiated based on the mole value of the yttria content, namely 8, 8.95, 10 and 11.54 mol. Meanwhile, GDC varied based on the (LiNa)<sub>2</sub>CO<sub>3 </sub>content such as 7.8, 10, 16.8 and 30 %. With the numerical model, the calculation error is an average of 7.32 % and 6.89 % for the experimental power and voltage values. In SOFC with the YSZ electrolyte, it was found that the power output can increase 26.4–35 times with an increase in operating temperature from 500 °C to 750 °C. Whereas in SOFC with the GDC electrolyte, it was found that the power output can increase 18.6–22.6 times with an increase in operating temperature from 500 °C to 750 °C. YSZ also showed the potential for an increase in power output as the SOFC temperature increases above 750 °C, while the 30 % variation (LiNa)<sub>2</sub>CO<sub>3</sub>-GDC shows a limited increase in ionic conductivity at 750 °C.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Fahrizal Perdana Fahmul ANALISA NUMERIK PENINGKATAN TRANSFER KALOR ALIRAN TURBULEN FLUIDA NANO TiO₂/AIR PADA CIRCULAR MINICHANNEL 2021-12-30T10:37:16+00:00 Budi Kristiawan Agung Tri Wijayanta Wibawa Endra Juwana Shegi Wulandari <p>Conventional heat transfer fluids such as water, ethylene glycol and oil are limited by their poor thermal properties therefore it is needed the advanced heat transfer fluids that be able to improve their thermal performance. Nanofluids is a colloidal dispersion of nano-sized particles which are a breakthrough of thermal system. This numerical study using the multi-phase mixture model method investigated the convective heat transfer of TiO<sub>2</sub>/water nanofluids flowing through a circular mini channel with a 1.09 mm diameter and 306 mm length under turbulent flow regime. TiO<sub>2</sub> nanoparticles with a diameter of 21 nm were dispersed into water with volume concentrations of 1.0, 2.0, 3.5, and 5.0 vol.%. The Reynolds number was varied from 4000-20,000 and a constant heat flux of 6500 W/m<sup>2</sup>. The results showed that the addition of nanoparticles and the variation of the Reynolds number increased the convective heat transfer coefficient of TiO<sub>2</sub>/water nanofluid by 5.18%, 7.4%, 12.4%, and 14.3%, respectively, with increasing in nanoparticles concentrations.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Budi Kristiawan ANALISIS FREKUENSI NATURAL DAN MODUS GETAR BALOK KANTILEVER ALUMINIUM DENGAN METODE ELEMEN HINGGA DAN EKSPERIMENTAL 2021-12-18T15:20:57+00:00 Nanang Endriatno <p>A structure can experience vibration at a certain level, parameters such as material properties, position of supports, and system frequency determine their vibration characteristics. This study aims to analyze the relationship between natural frequency and vibration mode using both Autodesk Inventor software and experimental method. Vibration mode analysis was carried out on 5 modes of a cantilevered aluminum beam. Experimental tests were also carried out to measure the dynamic responses or vertical vibration displacements using a vibration meter. The beam used was 6061 Aluminum series material with a length of 90 cm with 5 measurement points at an interval of 18 cm. The results show that each of natural frequency (w<sub>n</sub>) has a different vibration mode. The experimental results show the same trend as the simulation results. Thus, the vibration are determined by the frequencies applied to the system and measurement positions on the cantilevered aluminum beam.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Nanang Endriatno PENGARUH JARAK MISALIGNMENT DRIVE SHAFT COOLING TOWER TERHADAP TEGANGAN NORMAL DAN TEGANGAN GESER 2022-05-22T00:16:06+00:00 Rachmat Subagyo Hajar Isworo Mastiadi Tamjidillah Muchsin Muchsin Hendry Y Nanlohy <p>The purpose of this study was to determine the effect of misalignment distance of Cooling Tower drive shaft on normal stress and shear stress. Tensions that occur on the shaft continuously for a long time cause the shaft to experience fatigue. The greater misalignment distance will not only damage the shaft but can damage other components. For this reason, the misalignment of the cooling tower shaft is very important to study. This study uses a simulation method by first making a design drawing of the cooling tower drive shaft. Determine the material of the shaft and coupling, then perform simulations and analyze the results. The results of the Von Misses test at the highest and lowest voltages did not show a significant difference this was caused by the voltage difference that was not too far away. The shaft bears varying loads, causing stress along the shaft which results in rapid fatigue. These characteristics are associated with increased load and all indicate that misalignment reduces the life and reliability of the motor and its components. Based on the results of the Von Misses test and the lowest risk displacement that occurs to the effect of this misalignment is the misalignment distance (md = 1 mm), the higher the md value, the greater the risk that occurs to the cooling tower drive shaft.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Rachmat subagyo, Hajar Isworo, Mastiadi Tamjidillah, Muchsin Muchsin, Hendry Y. Nanlohy THE POTENTIAL OF ACTIVATED CARBON FROM PEAT SOIL AS AN ABSORBENT FOR HYDROCARBON (HC) AND CARBON MONOXIDE (CO) EMISSIONS IN MOTOR VEHICLES 2022-05-22T00:17:53+00:00 Abdul Ghofur Aqli Mursadin Apip Amrullah Raihan Raihan <p>This research aims to establish the effects of the length of the activated carbon-based medium on exhaust gas emission and evaluate the engine's corresponding performance. The method utilizes peat soil as the source of activated carbon. The soil is dried and then passed through a 30-mesh sieve. It is further heated to 400°C for an hour, soaked in a 25-percent H<sub>2</sub>SO4 solution, and then maintained at 120°C in an oven. The resulting activated carbon is then packed into an absorbent tube with a diameter of 30 mm and a varying length of 60 mm, 70 mm, and 80 mm. The tube is appended to the leaving end of a Honda Supra 125 X's muffler. The result suggests that the lowest emission is achieved when the tube length is 80 mm and at 2000 rpm of engine speed, i.e., with CO level of 2.57 percent and HC of 228 ppm. On the other hand, the highest emission is given by the tube length of 60 mm, i.e., with an HC level of 1437 ppm. In conclusion, it shows that the tube length affects the absorbent ability in reducing emission, but it does not significantly affect the engine's performance.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 abdul ghofur ghofur PENGARUH SUDUT KEMIRINGAN TERHADAP PUTARAN DAN DAYA HIDROLISIS PADA TURBIN ARCHIMEDES SCREW PORTABLE 2022-05-22T00:18:53+00:00 Gunawan Rudi Cahyono Apip Amrullah Pathur Razi Ansyah Rusdi Rusdi <p>Picohydro Power Plant is one of the renewable energy sources which utilizes water or irrigation channels with a small head and flow rate. Many factors can affect the hydrolysis power and also the power on the rotation of the screw turbine, one of which is the turbine design. The existing turbine design needs to be evaluated by several factors such as inner and outer screw diameters, slope, screw pitch, number of blades and condition of inlet and outlet as well as head and water flow. Moreover, if the turbine is designed for a portable one with a length of approximately only 1 meter. These factors indicate that the design of each screw turbine design needs to be optimized through data analysis to find the optimal hydraulic power and turbine rotation. This study aims to determine the effect of the tilt angle of the Archimedes screw turbine on the turbine rotation and also the hydraulic power of the picohydro power plant with variations of the turbine tilt angle (K) 20°, 30° and 40°. The method used in this research is to use a Performance Experiment Study by making an Archimedes screw turbine as a picohydro power plant. From the test results using a discharge of 2 ltr/sec, the largest turbine rotation is 144.3 at a 30° turbine tilt angle with 10.77 Watt of produced hydraulic power (P).</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Gunawan Rudi Cahyono, Apip Amrullah, Pathur Razi Ansyah, Rusdi - UJI KARAKTERISTIK PEMBAKARAN DROPLET CAMPURAN MINYAK JAGUNG-SOLAR 2022-05-22T00:19:57+00:00 Herry Irawansyah Rachmat Subagyo Bayu Aditya Wisnu <p>Corn oil may be one of the solutions to overcome biodiesel mixing as a substitute for fossil energy. In this study, we investigate the combustion characteristics of a mixture of corn oil with diesel oil. We used corn oil mixed with diesel oil using percentages 10%, 20%, 30%, 40%, and 50%. Characteristics of combustion were investigated by the time of ignition, visualization (height of fire and color of fire), flame temperature, and rate of combustion. The results show the highest ignition delay time is shown by a mixture percentage of 50%, which is 6,28 s. The flame of combustion has a yellow color. The highest flame was shown by the percentage of the mixture 10% that was as high as 66mm. The highest flame temperature in the percentage of 50% mixture with a temperature of 63,7°C. The highest combustion rate test results are shown by a 50% mixed percentage that is 0.849 s.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Herry Irawansyah, Rachmat Subagyo, Bayu Aditya Wisnu STUDY OF ELECTROLESS NICKEL PLATING ON RAPID PROTOTYPING MODEL USING ACRYLONITRILE BUTADIENE STYRENE 2022-05-12T13:31:22+00:00 Putu Hadi Setyarini Elvin Stefano Slamet Wahyudi <p>Electroless plating on Acrylonitrile Butadiene Styrene (ABS) is a metallization process that involves a reduction and oxidation reaction between the nickel source and the substrate material. The purpose of this research is to determine the ability of nickel deposition in the nickel electroless plating process with a specific etching time variation. This nickel electroless procedure begins with a chromic acid etching process that can last anywhere from 15 to 55 minutes and is useful for increasing roughness and creating submicroscopic cavities. After the etching process is finished, the surface roughness test is performed with a Mitutoyo SJ-210. Additionally, the activation step is carried out for 5 minutes in order for the polymer to become a conductor, allowing the plating process to proceed. The electroless plating process was then carried out for 55 and 75 minutes, with the goal of depositing nickel metal on the ABS surface. The coating results were analyzed using Fourier Transform Infrared (FTIR) spectroscopy IRSpirit/ATR-S serial No. A224158/Shimadzu to determine the functional groups formed both before and after the coating process, X-Ray Diffraction (XRD) to determine the character of the crystal structure, and phase analysis of a solid material using PANalytical type E'xpert Pro, To determine the surface morphology, the Zeiss EVO MA 10 was used to perform scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) at 1000x magnification. The test findings demonstrate that, based on a range of investigations, etching variations of 15,25,35,45, and 55 minutes etching time 55 minutes are the best nickel deposited substrates, as evidenced by EDS data, where this treatment has the largest weight fraction of nickel. As a result, the longer the etching period, the rougher the surface becomes, affecting the capacity of nickel deposition to increase. Furthermore, it can be demonstrated in this investigation that the nickel deposited is in an amorphous form.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Putu Hadi Setyarini PENAMBAHAN KATALIS BIO KARBON AKTIF UNTUK PENINGKATAN PRODUKSI HDROGEN PADA ELEKTROLISIS AIR 2022-06-05T02:49:57+00:00 Purnami Purnami Redi Bintarto Willy Satrio Nugroho <p>Air electrolysis is the decomposition of air compounds (H2O) into Oxygen and Hydrogen using an electric current. Currently, the efficiency of conventional electrolysis is about 50%. The use of catalysts is part of an effort to increase Hydrogen production. In this paper, 50 ppm and 100 ppm of Bio Activated Carbon of Sugarcane Leaves (BKADT) have been added as catalysts to increase Hydrogen production. FTIR testing has shown that BKADT has an aromatic ring functional group that has a magnetic field. By using ImageJ software, it has been proven that the BKADT surface has an electric charge which is dominated by a positive charge. The magnetic field plays a role in Hydrogen, where the electric charge plays a role in increasing its dissolution so that it becomes a good conductor. As a result, a large increase in BKADT increases Hydrogen production. The greatest hydrogen production of 14.5 ml for 10 minutes was obtained at the addition BKADT of 100 ppm.</p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Purnami Purnami PENGARUH TEKANAN PEMOTONGAN TERHADAP LAJU KOROSI STAINLESS STEEL 316L DENGAN PROSES ABRASIVE WATER JET CUTTING (AWJ) 2022-05-12T13:34:31+00:00 Teguh Dwi Widodo Rudianto Raharjo Redi Bintarto Mega Nur Sasongko Satria Pamungkas <p class="Abstract"><span lang="EN-GB">The waterjet pressure on the Abrasive Water Jet cutting processes affects all the related to the phenomenon of the material. In this study, the effect of water pressure on the AWJ process on the surface quality and corrosion properties of 316L Stainless steel was investigated. The cutting process is carried out by varying the pressure on the nozzle and with the cutting angle being kept at an angle of 90º to the substrate surface. In this research, Garnet with 200 mesh is used as the abrasive material. The results of the AWJ will be tested for corrosion using the 3-cell electrode method and then the surface topography will be observed using SEM. The results obtained in this study are that the corrosion rate decreases with increasing pressure in the AWJ process, however there is an increase after passing the optimal point, namely at 3500 Psi pressure.</span></p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 Teguh Dwi Widodo, Rudianto Raharjo, Redi Bintarto, Mega Nur Sasongko ANALISIS SIMULASI PENGARUH VARIASI JARAK DAN MATERIAL SIRIP KONDENSOR AC SPLIT TERHADAP LAJU PERPINDAHAN PANAS 2022-05-22T00:22:06+00:00 Edi Elisa I Gede Wiratmaja Ardy Prasetya Vidiantara <p class="Abstract" style="margin-bottom: 12.0pt; line-height: 12.0pt;"><span lang="EN-GB">According to the functions and needs, in the future Air Conditioners must be able to have good performance as an air conditioning machine. Therefore, the Air Conditioner (AC) must be designed as well as possible to meet human needs which will increase in the future in terms of air conditioning, so it is necessary to analyze several parameters in designing, in order to maximize or improve the performance of each component of the cooling machine. This study aims to determine the effect of variations in distance and fin material of the AC Split condenser on the heat transfer rate using Computational Fluid Dynamic (CFD) simulation in Solidworks 2018 software. The fin distance variations that used are 0.5 mm, 1 mm (standard), and 1.5 mm. In addition, the fin material is also varied by using aluminum (standard), silver, and copper at each fin spacing. The type of research is experimental research, by using data analysis methods, called the finite element method. The results of the analyze that has been carried out, it shows that the smaller the distance between the fins, the higher the heat transfer rate, and the greater the thermal conductivity value of a material, the higher the heat transfer rate.</span></p> 2022-06-22T00:00:00+00:00 Copyright (c) 2022 I Gede Wiratmaja, Edi - Elisa, Ardy Prasetya Vidiantara