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<![CDATA[Implementasi Keselamatan dan Kesehatan Kerja (K3) Pada Aktivitas Fabrikasi (Pengelasan, Pemotongan, Penggerindaan) di Kota Medan ]]>
<![CDATA[., Rahmatullah]]>;
<![CDATA[Umroh, Bobby]]>;
<![CDATA[Amiruddin, Arfis]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v5i2.11447
<![CDATA[Occupational safety and health (OSH) is basically in the interest of all parties and is a basic right for workers. A safe and comfortable working process is an asset that is maintained continuously for quality and timely production. Work accidents are something that is highly avoided, work accident control must be carried out with methods that are in accordance with the field and industrial conditions. The purpose of the discussion in this paper is, how to control OSH in the fabrication industry in a sustainable manner, how to create good OSH regulations and make the production process safe and comfortable, how to form a good and professional work attitude. Work accidents that occur are actually the end result of a rule and unsafe working conditions. 85% of the causes of accidents are human factors. The fabrication industry carries out several processes such as welding, cutting, final processing and other supporting processes in the workshop. Recommendations have been made and implemented to reduce and control work accidents. The application of OSH in accordance with the concept of occupational health and safety management, theoretically the industry will be able to reduce the number of work accidents even to zero accidents from work accidents.]]>
<![CDATA[Perpindahan Panas dan Penurunan Tekanan Pada Plat Rata Dengan Media Berpori (Porous) ]]>
<![CDATA[Umurani, Khairul]]>;
<![CDATA[., Rahmatullah]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>;
<![CDATA[Nasution, Arya Rudi]]>;
<![CDATA[Pratama, Riza Fauzi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v6i1.13598
<![CDATA[Convection heat transfer rate on a flat plate with a certain temperature can be increased by increasing the average heat transfer coefficient, increasing the surface area of heat transfer or both. In this study, stones and marbles were used as specimens of porous media with a diameter of 15 mm with a rock porosity of 43.8%, and marbles of 50.3% which were packed on a flat plate and tested in a rectangular air channel with an air velocity of 1 m /. s, 2 m / s, 3 m / s, 4 m / s, 5 m / s. Take experimental measurements on a heater set at 220 V. After steady conditions are established, record the temperature on the flat plate and the ambient air temperature. The highest Nusselt number occurs on flat plates with rock specimens of 69.025 and the highest convection heat transfer occurs on flat plates without porous media at 44.98 Watt, while convection heat transfer on flat plates with rock-porous media is lower than flat plates with porous media marbles. The friction factor decreases as the Reynold number increases. The greater the Reynold number, Nusselt number and the Convection heat transfer, followed by a decrease in the friction factor]]>
<![CDATA[Rancang Bangun Acwh Dengan Model Tanki Horizontal Dan Penambahan Pcm Sebagai Isolator Dari Sumber Panas ]]>
<![CDATA[Rosadi, Irham]]>;
<![CDATA[Siregar, Chandra Amirsyahputra]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>;
<![CDATA[Lubis, Riadini Wanty]]>;
<![CDATA[Fadillah, Fahri]]>;
<![CDATA[M, Moranelo]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v5i2.11722
<![CDATA[Into several stages, namely design, material selection and manufacture. The design uses solidworks 2013 software which includes frame design, tank design, Helical-Coil heat exchanger design and the stage of uniting components designed to be able to flow refrigerant heat to water. The stage of making the tool follows from the design that has been made, namely the frame using angle iron (L) with dimensions of 750mm x 390mm x 1500mm, the tank uses a stainless steel plate and the addition of PCM around the tank with a capacity of 60 liters and an overhaul of the compressor outlet flow that is routed to the Helical-Coil heat exchanger made of copper with a diameter of 6.35mm with APK dimensions 150mm x 300mm or half of the tank height. From the test results, ACWH can work well as evidenced by not using PCM, increasing water temperature with the addition of PCM reaching 60.25 oC within 7 hours of testing, while not using PCM water temperature reaching 60.17 oC within 10 hours.]]>
<![CDATA[Sistem Orientasi Tegangan Pada Chasis Aisi 4130 Gokart Phev Platform Baterai–Solar Panel ]]>
<![CDATA[Weriono, Weriono]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v6i1.13807
<![CDATA[Electric car consists of a chassis that carries the vehicle's load, such as an electric motor to drive the wheels, and a battery as an energy source for the electric motor. Overall vehicle performance is controlled and monitored by the battery and engine controller systems. The objectives of the research on Design and Analysis of Electric Car Chassis Using the Finite Element Method Using Solidworks 2017 can be described as follows: Identifying aspects of the design strength of the AISI 4130 frame (hollow steel 40 x 60 mm). The design determines the wheel alignment of the wheel geometry, the angle of inclination of this wheel will later be used as a reference when making the frame and continues to make the geometry for the wheels and the width of the rear wheel tread. This axle uses a vehicle equivalent axle. Measurement, the rear wheel track of the vehicle axle is 1126 mm, and the front wheel track uses a track with a different width. For easier handling during maneuvers, the wheelbase is fixed at 1835.5mm, so the front front wheel track is wider than the rear wheel track. Mesh on the chassis using tetrahedral as shown in figure 2.a then loading is given to the node point position where the driver is on the chassis supporting the driver's load is 750 N and the battery is added, the weight of the BLDC motor and solar panel is 310 N and the maneuver is 100 N. The simulation results show the voltage value VonMises Stress with AISI 4130 material with a maximum stress value of 2.796 x 108 Pa, right maneuver 3.92 x 108 Pa and left maneuver 4.071 x 108 Pa with a given load of 1060 N. The maximum vonmises stress occurs when the kart maneuvers left while the highest maximum displacement occurs only due to the influence of gravity without being affected by vehicle maneuvers so that maneuvers can reduce displacement.]]>
<![CDATA[Pembuatan Otomatisasi Alat Pengecekan pH Air Pada Mesin Pemberi Pakan Ternak Ikan ]]>
<![CDATA[Dongoran, Rahmat Sati]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v6i2.17195
<![CDATA[An automatic fish feeding and water pH control system for catfish farming is being developed. The system involves assembling and constructing a control circuit with electronic components and sensors, applying IoT technology to control the pH regulator remotely. The device is designed to control water pH through circulation and periodic measurement of water pH in the catfish pond using a pH sensor (PH4502C type). The system utilizes a digital RTC DS1307 module to schedule feeding times. Communication between a smartphone and the control circuit occurs over the internet for data transfer and commands. It enables feeding control for catfish ponds and integrates with smartphones. The machine designed for feeding and water pH regulation in fish farming uses an Arduino device with Node MCU as the control unit. The pH sensor and water pH regulator functions are implemented to control and check water acidity in the pond. Automation processes include using a servo motor for automatic feeding, a pH sensor for water pH measurement, and a water pump for pH regulation. The RTC serves as a digital clock to provide timing information to the microcontroller, ensuring the programmed tasks run as scheduled. The IoT system allows remote control and monitoring, enabling bidirectional communication using a WiFi adapter device, specifically the Node MCU. The Node MCU connects to a WiFi hotspot and interfaces with the Blynk server on the smartphone. The system's menu includes pH display, buttons to activate/deactivate the water pump, feeding control, and notifications.]]>
<![CDATA[Pembuatan Cetak Paving Block Berbahan Plastik Dan Pasir ]]>
<![CDATA[Siagian, Nusyirwan Said]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>;
<![CDATA[Mukhtar, Muharnif]]>;
<![CDATA[Siregar, Chandra Amirsyahputra]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v5i2.12404
<![CDATA[Plastic is a synthetic polymerization product material, plastic is very difficult to decompose where the degradation of the plastic itself usually takes decades by nature. According to the Ministry of Environment and Health and the Ministry of Industry, the amount of waste in 2016 reached 6.25 million tons per year. This makes plastic waste one of the causes of environmental pollution. Recycling plastic waste is a solution to the problem of plastic waste which is increasingly polluting the environment. Realizing the importance of plastic recycling. Then a recycling tool will be made or changing the shape of plastic to be more useful, such as recycling plastic into paving blocks. Recycling plastic waste into paving blocks is expected to be a solution to environmental pollution due to plastic waste. Therefore a paving block printing tool made from plastic and sand is designed and produced which can reach a temperature of 397 0C, the paving block printing machine can make paving blocks made from PVC (Polyvinyl Chloride) plastic waste or plastic pipes. This tool can melt as much as 1.2 kg of plastic waste, namely 1 (one) paving block made from plastic waste and sand. The resulting paving blocks are in the form of bricks with sizes according to SNI Number 03-0691-1998 with dimensions of 10 cm x 20 cm x 6 cm.]]>
<![CDATA[Pengaruh Annealing Baja St 37 Terhadap Kekerasan Dan Kekuatan Tarik ]]>
<![CDATA[., Affandi]]>;
<![CDATA[Nasution, Arya Rudi]]>;
<![CDATA[Tanjung, Iqbal]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v5i2.11796
<![CDATA[Steel ST 37 which is equivalent to AISI (The American Iron Steel Institute) is one of the steels produced for the manufacture of various machine components. To improve the mechanical properties and material structure of ST 37 Steel, it is necessary to carry out the heat treatment (annealing) process. The objective of this study was to determine the annealing treatment of ST 37 steel on hardness and tensile strength to analyze the tensile test on ST 37 steel before and after annealing treatment and to analyze the hardness test of ST 37 steel before and after annealing treatment. The annealing process is carried out by preparing the test material and inserting the test material into the furnace and tightly closing the door of the heat treatment furnace. Set the temperature to be used in the test, which is 500C, and held for 60 minutes. Then turn off the furnace and leave the test specimens in the furnace for 72 hours to cool through the air cooling medium, after which tensile and hardness tests are carried out. The test results of the tensile test specimens with the ASTM E8/E8M standard and the hardness test specimens with the ASTM E18 standard are, the average value of the tensile test results before the annealing process is 50.65 kgf/mm and the average value of the tensile test results after the annealing process is 31.45 kgf/mm. While the average value of the hardness test before the annealing process was 75.22 HRA and the average value of the hardness test after the annealing process was 67.63 HRA. From these results, ST 37 steel before the annealing process has higher hardness and tensile strength. However, in subsequent tests, harder specimens can be used compared to ST 37 Steel specimens, and in the use of heat treatment furnaces, it is preferable to be in a state of heat safety.]]>
<![CDATA[Mamfaatkan Limbah Plastik Jenis Styrofoam Untuk Pembuatan Paving Block ]]>
<![CDATA[Harahap, Reza Elvandra]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>;
<![CDATA[Zulkarnain, Fahrizal]]>;
<![CDATA[., Affandi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v5i2.12390
<![CDATA[This paving block made from Styrofoam plastic waste is a reuse plastic which has been a big problemin human life from long ago to the present this. These paving blocks are made with a mixture of Styrofoam and sand thas is made in two aggregates, namely varian one with a composition of 50% Styrofoam with a weigth of 600gr anda 50% sand with a weigth600gr and variation two with a composition of 25% Styrofoam with a weigth of 300gr and755 sand with a weigth 900gr. This research is divided in several stages, namely the collection of materials ( Styrofoam and sand), weigth with each aggragate, then cook Styrofoam and mixit with sand, stirring the specimenso that they are well mixed sand and Styrofoam, fed into the mold, extrackted in the mold when its dry. In making this specimen a specimen moled has size 200mm in length, 100mm in widthand 60mm in heigt. 3mm thick irom plate. Then the specimen is cut according to the paving test standards block SNI 03-0691-1996. The specimen is cut using a grinder until it becomes size 60mm x 60mm, then eacg variation was made into 3 specimens where to take the average at the timeof data collection. Specimen variation one produces an average compressive strength of 32MPa, while specimen variation two resulting in an average compressive strength of 25,7MPa.]]>
<![CDATA[Rekayasa Alat Pendeteksi Kebocoran Gas Berbasis Arduino Uno Dengan Sensor MQ-2 Pada Regulator LPG ]]>
<![CDATA[., Rahmatullah]]>;
<![CDATA[Umurani, Khairul]]>;
<![CDATA[Amiruddin, Arfis]]>;
<![CDATA[Kurniawan, Wahyu]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v8i1.21983
<![CDATA[The engineering of an Arduino Uno-based gas leak detection device with an MQ-2 sensor was created to optimize security against gas leaks that occur. The public must know the signs of a leak, such as smelling gas, a hissing sound in the gas line and so on. The aim of engineering this tool is to create an Arduino Uno-based gas leak detection tool that uses the MQ-2 sensor on the LPG regulator. Gas leaks can cause risks such as fire and explosion, so it is important to have a gas detection system. When the sensor detects the presence of gas, the system will trigger a buzzer to provide an audible alarm and turn on the LED light as a visual indicator. The LCD will display the detection status with clear text, namely "Leak Danger" when gas is detected, and "Safe" when there is no leak. The test was carried out using a 3 kg LPG gas cylinder, with the results showing that the MQ-2 sensor could detect gas within 3 seconds. The results of this test prove that the tool developed is able to provide a fast response to gas leaks, so it can be a solution to increase the safety of LPG use.]]>
<![CDATA[Pengaruh Jumlah Sudu Prototype Pembangkit Listrik Tenaga Mikrohidro Tipe Whirlpool Terhadap Kinerja ]]>
<![CDATA[Umurani, K]]>;
<![CDATA[Siregar, Ahmad Marabdi]]>;
<![CDATA[Al-Amin, Surya]]>
<![CDATA[ Rekayasa Material, Manufaktur dan Energi Vol 3, No 2: September 2020 ]]>
Publisher : <![CDATA[Fakultas Teknik UMSU ]]>
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DOI: 10.30596/rmme.v3i2.5272
<![CDATA[The water turbine is a device that converts water flow energy into shaft mechanical energy. Before being converted into mechanical energy in the turbine, the potential energy needs to be converted into kinetic energy first. The vortex will move the turbine blades which cause the runner to rotate so that there is a change in the kinetic energy of the water into mechanical energy in the turbine which is used to drive the generator and then into electrical energy. The purpose of this research is to analyze the torque that occurs on the shaft and turbine power. Water is flowed to the test with a pump through a control valve. The water flow is read by a rotameter attached to the pipe to the upper reservoir, while the torque is measured using a load cell, while the rotation is measured using a photo sensor interrupt to read the movement of the counter wheel. Data from load cell and photo sensor interruptor is read using Arduino Uno then the data is stored on laptop in excel file using plx-daq software. The minimum torque for the 8 blades is 9,12 kg.mm and 7.61 kg.mm for 6 blades at a water flow rate of 90 l / min. The maximum torque occurs at the 8 blades of 10.06 kg.mm while the maximum torque at blade 6 is 9,12 kg.mm at the same water flow rate of 150 l / min. The minimum turbine power for the 8 blades is 0.47 W and 0.27 W for the 6 blades at a water flow rate of 90 l / min. The maximum turbine power at blade 8 is 1.03 W, while the maximum power at blade 6 is 0.91 W at the same water flow rate of 150 l / min. From the data analysis, it can be seen that the power for the turbine with the number of blades 8 tends to be greater than the power for the turbine with 6 blades, but if the percentage increases in power between the 8 blades and 6 blades the trend decreases even though the flow rate is increasing.]]>
