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All Journal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Prosiding Seminar Nasional Unimus Jurnal Polimesin Prosiding SNTTM Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development
Agus Nuramal
Mechanical Engineering Universitas Bengkulu, Bengkulu, 38371, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health

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PENGARUH PERLAKUAN ALKALI TERHADAP SIFAT FISIS DAN MEKANIS SERAT LANTUNG (ARTOCARPUS ELASTICUS) Hendri Hestiawan; Dody Ariawan; Khairul Amri; Agus Nuramal; Aditya Afrizal; Sudibyo Sudibyo
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.1220

Abstract

Alkali treatment of natural fibers is one of the chemical treatments used to increase the exposed cellulose content through the removal of hemicellulose and lignin on the fiber surface. This study aims to investigate the effect of alkali treatment on the physical and mechanical properties of lantung fibers. The materials used in this          research consist of: lantung fiber (Artocarpus elasticus) with an alkali treatment process using 4% and 6% natrium hydroxide (NaOH) solutions and immersion time of 1 and 2 hours, at room temperature. The fiber neutralization process includes washing the fibers using fresh water and drying them at room temperature for 48 hours. Tests carried out include XRD test, SEM photo observations conducted at Balai Penelitian Teknologi Mineral, Lembaga Ilmu Pengetahuan Indonesia and fiber tensile test based on ASTM D 3379 standard. The results of XRD and fiber tensile test showed that alkali treated lantung fibers were effective in increasing the crystallization index (CI) value and fiber tensile strength. The highest CI values and fiber tensile strength were obtained at alkali treatment of 4% NaOH for 2 hours, respectively 85.42% and 228.5 MPa. The results of SEM photo observations showed that alkali treatment on the fiber surface could remove impurities based on the concentration of sodium hydroxide (NaOH) solution and soaking time. This shows that proper alkali treatment can increase the strength of lantung fibers.
Edukasi Pemakaian Masker dan Face shield dalam Mencegah Penyebaran Covid-19 Kepada Pedagang Pasar Panorama Kota Bengkulu Hendri Hestiawan; Agus Nuramal; A. Sofwan F. Alqap; Yossie Anggraeny M
Prosiding Seminar Nasional Unimus Vol 3 (2020): Optimalisasi Hasil Penelitian dan Pengabdian Masyarakat Menuju Kemandirian di Tengah P
Publisher : Universitas Muhammadiyah Semarang

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Abstract

Covid-19 has infected millions of people around the world, including Indonesia. Market traders who interact with many people are very vulnerable to Covid-19 transmission. This activity aims to provide education and assistance to the traders at Panorama Market of Bengkulu City to comply with the health protocols set by the government, such aswearing masks and face shields, especially for outdoor activities. This activity was also followed by the distribution of masks and face shields to traders at Panorama Market so that they could be used in their daily trading activities. The educational method used participatory action research using lectures, discussions, questions and answers, demonstrations, posters and banners. This educational activity is a collaboration between the Engineering Faculty of Universitas Bengkulu, Community Health Center Jembatan Kecil and Sahabat Psikologi of Bengkulu City. Educational materials include the introduction of Covid-19 and health protocols in the form of wearing masks and face shields. The evaluation of the activity used a questionnaire sheet to find out the participants knowledge before and after being given education. The results of the activity showed that the education provided by the facilitator canincrease the knowledge of market traders about Covid-19 and health protocols in the form of wearing masks and face shields in an effort to prevent the spread of Covid-19. Participants knowledge of Covid-19 increased from 50% to 85%, while the importance of wearing masks and face shields increased from 60% to 90% after being given education.Keywords: Covid-19, Face shield, Health protocol, Market trader, Mask
PEMANFAATAN INTERNET OF THINGS UNTUK MONITORING SUHU DI BPPT–MEPPO Ikhwanusshofa, Muhammad; Nuramal, Agus; Supardi, Nurul Iman
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 1 (2020): April 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i1.13274

Abstract

Proses monitoring suhu merupakan hal yang sangat penting untuk dilakukan khususnya dalam dunia industri. Dengan monitoring suhu, diperoleh data suhu yang dapat digunakan untuk melakukan quality control dan analisa pemecahan masalah ketika terjadi suatu kegagalan. Pada artikel ini akan diambil data suhu dan kelembaban di ruang workshop BPPT-MEPPO dengan menggunakan module DHT11 yang sebagai sensor suhu dan kelembaban. Sinyal yang diterima oleh DHT11 akan diolah oleh Raspberry Pi 3 dan dikirimkan ke ThingSpeak sebagai server penerima data. Setelah data masuk ke ThingSpeak, data pengukuran yang telah dilakukan dapat dilihat menggunakan handphone ataupun komputer yang mempunyai akses internet. Data yang diperoleh selanjutnya ditampilkan dalam bentuk grafik suhu dan kelembaban vs waktu. Tampilan grafik tersebut dapat diakses secara mobile dengan perangkat telefon yang terhubung dengan akses internet.
PERPINDAHAN PANAS PADA PIPA HEAT EXCHANGER DENGAN PIPA BERBAHAN KACA, TEMBAGA, DAN TEMBAGA YANG DILAPIS RESIN Nuramal, Agus; Puspawan, Angky; Pratama, Gilang Giyas
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18396

Abstract

In this study, a heat exchanger will be designed with the principle of tube-pond, normal water flowing tubes and hot water-filled ponds. This study aims to determine the heat transfer characteristics of glass pipe, copper, and resin coated copper.The materials used in the tube were glass, copper, and resin coated copper, polyester resin of yukalac BTQN 157 and a catalyst of methyl ethyl ketone peroxide. In the test, the water temperature variation in ponds was 70?C, 80?C, and 90?C. At each temperature, the test was carried out by flowing normal water into the tube by varying the discharge by 1lpm, 0.8lpm, 0.6lpm, 0.4lpm, and 0.2lpm. The values for the temperature in and out of the water in the tube are obtained. So that the overall heat transfer coefficient value and its effectiveness can be calculated.The results showed that the higher the discharge, the overall heat transfer coefficient on the tube increased. where the highest value is in the copper tube meterial at 1 lpm discharge, which is at 80?C pond temperature of 1544.163 W / m2?C. While the smallest value of the overall heat transfer coefficient is the glassmaterial at the time of discharge 0.2 lpm, which is at a temperature of 90?C of 199.5889 W / m2?C
PROSES PENGEBORAN LUBANG BUCKET EXCAVATOR MENGGUNAKAN MESIN LINE BORING DI PD. XYZ Hasibuan, Zulfahmi Matumona; Nuramal, Agus; Hestiawan, Hendri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 1 (2021): April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i1.20152

Abstract

PD. XYZ that is located in Soeprapto Dalam, Bumi Ayu, Selebar District,  Bengkulu is engaged in the metal working, construction and workshop. To facilitate the process, a machine is needed to help speed up each process. Tools  machine are used to make human work easy. Drilling process is one of the machining process that the aim is to enlarge the diameter of the excavator bucket hole. The purpose of this study are determine drilling process of a bucket excavator and observe the result of drilling on a line drilling machine. The research used a drilling line TPX6113 type that the chisel is YG6. Drilling process is carried out with three feeding process, namely 4mm, 2mm and 2 mm that the feeding speeds are 20 rpm and 31.5 rpm. The result is the smoothest process drilling in the high speed
Flow Characteristics of Pumps in Series and Parallel Lesmana, Pandu; Nuramal, Agus; Suryadi, Dedi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2021): Oktober 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i2.20173

Abstract

Pump is a device used to move fluid. The pump moved the fluid from a lower pressure place to a place with higher pressure. If the head or pump capacity needed cannot be achieved using only one pump, it can use two pumps or even more which can be arranged either in series or in parallel. The research objective for pumps arranged in series and in parallel is to determine the characteristics of the circuit of two pumps each of which has different characteristics. In this study, data retrieval is done by measuring the pressure on suction and discharge using pressure gauge at pumps 1 and 2. Whereas to measure the flow rate of a pump arranged in series and parallel using a flowmeter installed on the discharge side of the circuit. This research was done by varied the valve openings on the pump discharge side 2 namely. 2x1800, 4x1800, 6x1800, 8x1800 and full openings. From the results of tested the characteristics of the pump used water fluid on the series arrangement, the highest head value at valve opening 2 x 1800 is 30.99 m at discharge 0 LPM and the lowest head at valve opening 10 x 1800 (full) is 23.99 m at discharge 0 LPM. In parallel circuits, the highest head obtained is 16.99 m with 0 LPM discharge at 8 x 1800 valve openings and lowest head 14.99 at 0 LPM discharge occurs at full valve openings.
PENGARUH TEKANAN VACUUM CONDENSER TERHADAP KINERJA STEAM TURBINE GENERATOR Hidayatullah, Nasrul; Wahyudi, Dedi; Nuramal, Agus
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 1 (2023): April 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i1.30100

Abstract

Condenser is an main equipment on power steam electricity system generator. Condenser is an head exchanger that functions as a phase changer from the steam turbine output into water, which is where water results condensation the will pumped to HRSG for used back. Vacuum condenser working for speed up the condensation process in the condenser. PT. PLN (Persero) UPDK keramasan is generator electricity consists of 2 units from gas and steam power plant with power by gas turbine generator of ± 27 MW and a steam turbine generator of ± 13 MW so that the total each unit is 40 MW. This research to determine of effect vaccum condenser pressure of condenser with power turbine, and efficiency thermal. calculation obtained at a vacuum condenser pressure of 15,41 kPa at a turbine power was 9681 kW, and obtain efficiency thermal was 20,39%. On pressure vacuum condenser 15,09 kPa at a turbine power was 9602 kW, and obtain efficiency thermal was 20,24%.
PENGARUH AIR FUEL RATIO (AFR) TERHADAP EFISIENSI TURBIN GAS Rifki Sulthan; Angky Puspawan; Agus Nuramal
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2023): Oktober 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i2.34064

Abstract

Gas turbine efficiency is an indicator to determine the performance of a generator. The greater the efficiency value of the gas turbine in a generator, the better the performance of the generator. One of the things that affect the value of the efficiency of a gas turbine is the air fuel ratio. Air Fuel Ratio (AFR) is the ratio of the amount of air and fuel in the combustion process in units of mass or volume. Air fuel ratio is a factor that affects the perfection of the combustion process in the combustion chamber. In the graphic image it can be seen that the lowest AFR values are on July 3 and 4 2022, when the gas turbine produces a loading of 20900 kW and 20100 kW with an AFR value of 39.76 unitless each. Whereas the highest AFR value is on June 28 2022 when the gas turbine produces a loading of 20780 kW with an AFR value of 40.68 unitless. The highest gas turbine efficiency value is on June 30, 2022, at a loading of 20,650 kW with a gas turbine efficiency of 83.3%. The lowest efficiency value is on July 2, 2022, at a load of 20,800 kW with a gas turbine efficiency of 81.05%. From the results of existing data processing and graphs, it can be seen that the value of the air fuel ratio and the efficiency of the gas turbine are inversely proportional, which means that when the value of the air fuel ratio decreases, the value of the efficiency of the gas turbine tends to increase. However, there are some deviations when the value of the air fuel ratio decreases, the efficiency of the gas turbine also decreases. Therefore it can be concluded that the value of the air fuel ratio affects the value of the efficiency of the gas turbine, however, the value of the air fuel ratio is not the only factor that affects the value of the efficiency of the gas turbine.
ANALISA NILAI KALOR BAHAN BAKAR BOILLER FIBER DAN CANGKANG Nopita, Dian; Nuramal, Agus; Supardi, Nurul Iman
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2024): April 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v8i1.36547

Abstract

Fiber and shell are widely use solid fuels in steam boilers. These fuels are waste products generated from palm oil processing. The purpose of this study is to analyze the heating value of fiber and shell. This study used 12 fuel samples, consisting of 3 pure fiber samples, 3 pure shell samples, 3 mixed samples with a composition of 90% fiber and 10% shell, and 3 mixed samples with a composition of 80% fiber and 20% shell, to analyze the calorific value. The weight of each sample is 1 gram. Calorific value is used to determine the high calorific value. The use of different samples produces different heating values, resulting in different high heating values. These different high heating values are then used to determine the low heating value, resulting in different low heating values. In this study, each boiler fuel has a different Low Heating Value (LHV). The highest low heating value is owned by pure fiber fuel with a value of NA (Not Available). While the smallest low heating value of boiler fuel is owned by a mixed type consisting of 90% fiber and 10% shell with a value of 179358,51 Kj/Kg.
PERFORMA POMPA SEKUNDER PADA SISTEM PENDINGIN REAKTOR NUKLIR Anugrah, Dwi Permana; Nuramal, Agus; Puspawan, Angky; Falah, Sabilul
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 2 (2024): Oktober 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v8i2.39461

Abstract

Secondary pump in the reactor nuclear works move fluid in the reactor with take hot from system primary coolant and discard it to environment. For support safety reactor nuclear this need done study to performance pumps secondary being one​​ system cooler reactor. Methodology study consists from studies literature, observation field, and data collection. Pump used as pump secondary to the system cooler Reactor nuclear This is centrifugal water pump with rate Genre volumetric 4500 liters/ minute with capacity adjustable water flow with characteristics heat exchanger. From the results calculation of data taken on three different day​show mark increased efficiency due to rising mark WP. This matter proves that mark WP on pump system cooler secondary reactor nuclear influence mark efficiency from pump secondary used.​ For mark efficiency highest there at 11:00 with​mark amounting to 18.288%.
Co-Authors A Sofwan FA Aditya Afrizal Afdhal Kurniawan Mainil Alqap, A. Sofwan F Angky Puspawan Anugrah, Dwi Permana Arie Vatresia Arif Rahman Hafiz Dedi Suryadi Dedi Wahyudi Deviya, Aprilman Dody Ariawan Eka Putra, Rama Dani Falah, Sabilul Hadi Susanto, Tri Nugroho Hardiansyah Hardiansyah Hasibuan, Zulfahmi Matumona Helmizar - Hendri Hestiawan Hendri Hestiawan Hendri Hestiawan Hidayatullah, Nasrul Ikhwanusshofa, Muhammad Izza, Rohul Jaya, Efran Riansyah Rahmat Julianto Sinaga Khairul Amri Lesmana, Pandu Mifta Aroyyani Nizam, Ahmad Nopita, Dian Nurul Iman Supardi Pratama, Gilang Giyas Pratama, Samuel Yoga Putra, Rama Dani Eka Rifki Sulthan Rosa, Khairul Amri Rosa, M. Khairul Amri Sandy, Rasidiq Karunia Satria, Miko Sudibyo Sudibyo Yossie Anggraeny M Yovan Witanto Yovan Witanto Yovan Witanto Yueprayuga, Abie zuliantoni, Zulian Zuliantoni, Zuliantoni Zuliantoni1, Zuliantoni