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Perancangan dan pengujian prototipe kapal ambulance Covid-19 tipe monohull elektrik untuk Kompetisi Kapal Cepat Tak Berawak Nasional Asral Asral; Seprian Adis
Jurnal Teknik Mesin Indonesia Vol 17 No 1 (2022): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v17i1.280

Penyebaran pandemi Corona Virus 19 masih menjadi ancaman serius. Pencegahan penyebaran dan penanganan pasien di rumah sakit bagi individu yang memunculkan gejala merupakan kunci utama mengatasi penyakit ini. Kurangnya transportasi air pada wilayah kepulauan terpencil di Indonesia, menyebabkan lambatnya penanganan pada pasien Covid-19. Oleh karena itu, dibutuhkan sebuah kapal ambulance yang mempunyai performa yang baik agar dapat mengangkut pasien menuju rumah sakit. Kajian ini dilaksanakan dengan tujuan untuk merancang prototipe kapal ambulance sebagai solusi dari permasalahan tersebut. Dari perancangan prototipe ini, diharapkan dapat dibuat dalam ukuran kapal yang sebenarnya. Jenis lambung yang digunakan yaitu monohull. Kajian ini dimulai dengan perhitungan ukuran utama, membuat rencana garis dan rencana umum, selanjutnya melakukan analisis hidrostatik, hambatan, stabilitas dan seakeeping kapal. Dengan menggunakan metode perbandingan optimasi dari kapal pembanding, didapatkan ukuran utama prototipe kapal yaitu LOA= 0,9 m, H= 0,25 m, B= 0,3 m, dan T= 0,07 m. Hasil perhitungan hidrostatik prototipe kapal memiliki displacement sebesar 5,139 kg dengan CB= 0,334. Nilai hambatan total prototipe kapal sebesar 31,42 N dan daya motor sebesar 428,77 W. Hasil stabilitas menunjukkan nilai GZ terbesar yaitu 11,26 cm pada sudut swing 70°. Untuk seakeeping prototipe kapal didapatkan nilai RAO yang paling tinggi pada sudut gelombang beam sea arah sisi prototipe kapal.

Prestasi Kincir Air Sudu Melengkung Tipe Undershot Sebagai Pembangkit Listrik Tenaga Air Pikohidro Pada Saluran Irigasi Sugiman Sugiman; Asral Asral; Feblil Huda
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The study waterwheel performance has done by utilizing the potentional of water energy source which is found inirrigation channel in Koto Tibun Village, Kampar Subdistrict, Kampar Regency. The purpose of this study is todetermine the achievement of the waterwheel curved undershot type on the irrigation canal. The design has beendone to get a curved angle of 54.21⁰ with a blade length of 0.7 m. The result is obtained from the test is the massof water type (ρ) 972 Kg / m³, the maximum water wheel eaya 244.3736 W at the 5th discharge (Q5) is 0.2221 m³/ s, and the highest efficiency 58.62576% at the discharge 3 (Q3 = 0.1671 m³ / s) with 1.3 rpm and 186.874 W.Achievement of waterwheels curved undershot curve can be seen through the power graph and the efficiency ofthe rotation indicating that the greater the value it will be along with the increase in rotational speed and willdrop at a certain speed of play.Keywords: waterwheel, undershot, curved blade, irrigation, picohydro

Analisis Komputasional Dinamika Fluida Pada Pipa Horizontal Pneumatik Konveyor Dengan Variasi Partikel Sakal Hanov Dulvin Sinaga; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The conveying process of solid particles with air as a medium transport is commonly found in industries. Phenomenon that occurs and must be calculated appropriately is the pressure drop on pneumatic conveyor pipeline. Computational Fluid Dynamics is a system analysis that used to predict fluid flow. The pressure drop that occurs in horizontal pipeline with a length of 2 m, an inner diameter of 80 mm and a thickness of 4 mm is simulated with Euler-euler model. Pressure drop characteristics to particle mass flow rate, particle concentration, particle diameter and air velocity was investigated. The simulation was performed using Fluent 14.5. The results indicated that with the increase of mass flow rate of particles, particle diameter and air flow rate, the pressure drop will increase. Particle concentration does not have a considerable influence in the pressure drop on horizontal pipeline.Keywords : CFD, particles, pressure drop

Pengujian Prestasi Kincir Air Tipe Overshot Di Irigasi Kampus Universitas Riau Dengan Penstock Bervariasi T Harismandri; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Currently the electricity has became a major requirement for human life. To fulfill the needs of electricity, the society used normally rely on state power generation company. Besides, that seemingly to electricity can be generated by means of utilizing the potential of natural energy that is around us. One untapped sources of the potential energy is energy of water, which in reservoirs of an environment campus of the University of Riau. According surveys, reservoir’s Riau University has head of 0.7 m and flow of 0.02 m3/s. This data used as a basis data to design type of overshot waterwheel. The waterwheel was tested by varying the penstock shape i.e cylindrical and rectangular. Based on design method was produced the diameter of waterwheel, the number and size of the blades as well as the sizes of penstock. The outside diameter and inside of wheel were 0.6 m and 0.5 m. Number of blades were 18 pieces with an area of 0,01m2. Then, the cylindrical penstock has 0.089 m of the diameter, whereas rectangular penstock sized of 0.1 m of wide and 0.1 m of high. Maximum power output was generated by the waterwheel with a cylindrical penstock of 21.05 Watt and efficiency of 43.78%, while for rectangular penstock was indicated the maximum power output of 19.8 Watts and efficiency of 42.40%.Keywords : PLTPH, Design of Water Wheel, Penstock

Kaji Eksperimental Pengaruh Massa Flywheel Terhadap Kinerja Kincir Air Dengan Sistem Transmisi Bertingkat Pada Saluran Irigasi Ari Setiawan; Asral Asral; Musthafa Akbar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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A study of flywheel mass variation is done in order to keeping the undershot waterwheel performance as a picohydro scale power plant. Testing is done with the available mass variation and in pair on each the four-shaft multilevel transmission system. From the test it is know that fluctuation of generator rotation decreases with increased flywheel mass, where the decrease of fluctuation occurred in flywheel mass 11.05 Kg and 14.63 Kg, while the constant rotation of the generator on the flywheel mass 26.54 Kg and 42 Kg. The optimal mounting position to reduce the fluctuation of rotation is the nearest position on the generator is on the fourth shaft. Influence of flywheel mass variation and mounting at transmission level, can be seen through the graph of fluctuation correlation of generator rotation with flywheel mass, indicates that the installation is on fourth shaft there was a decrease of fluctuation along with the addition of flywheel mass, so it affects the power generated generator.Keywords : Flywheel, Fluctuation, Waterwheel, Irrigation, Picohydro

Analisis Kinerja Kompresor Gas Reciprocating C-401 Menggunakan Metode Kenaikan Enthalpy Di PT. Energi Mega Persada Rahmad Fauzi; Syafri Syafri; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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In heavy lifting equipment that works pneumatically, the compressor is used in its function as an air filling device for power sources. A compressor when viewed from the way it works, there are two types of compressors, each of which works differently. The first type is a compressor with a positive displacement work method and the second is a compressor with a dynamic working method. Where the difference between the two types is the first positive displacement type compressor, this compressor model works by inserting air into a closed space, then at the same time the volume of the space is reduced, then the pressure inside will naturally increase. This high pressure which is used for various purposes in accordance with the designation of the compressor. This positive displacement compressor is used in reciprocating compressors and rotary. Meanwhile on the dynamic model compressor, the volume of space is fixed but the air inside the space is given speed. Then at the same time the speed is changed to pressure. This happens because the air in the room whose volume is still under pressure. Compressors that use this dynamic model are usually on turbo axial flow devices. Reciprocating gas compressors located at PT. Energi Mega Persada (EMP) Riau, has experienced a decline in performance, causing the performance of the compressor gas to be not optimal in compressing gas.Keywords: Enthalpy Rise Method, Reciprocating Gas Compressor, Peformance Decrease.

Modifikasi Perahu Jalur Menjadi Sarana Transportasi Pengangkut Barang Zikri Zikri; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Transportation is needed by the people around the Riau inland rivers to bring agricultural and natural products to the market or to other places. The transportation needed by the community is a boat or boat capable of carrying goods in Riau's inland rivers which are relatively narrow, shallow and muddy. One of the river transportation used by the people of Riau is the lane boat, where this boat has proven reliable and resilient when operating in rivers that are narrow and muddy, but it needs modification and better design in order to be able to carry goods safely and optimally. The design begins by taking measurements directly to the lane boat and then using the comparison method the total length is 200 cm, width 50 cm and height 20 cm. The planned ship prototype has a reasonable shape and size and does not deviate from the provisions based on the calculation of the main size ratio of the ship. The ship design was made with the help of maxsurf software and obtained data in the form of hydrostatic parameters, resistance, stability and effective power. The prototype of this ship is operated by a remote control system and uses a 0.81 kw lawn mower engine. The test results show that the ship prototype has a good balance and complies with the criteria and requirements of the IMO (International Maritime Organization).The maximum carrying capacity of the ship is 16 kg with a speed of 1.46 m / s or 2.84 knots. From the test, the fuel consumption of the ship's engine shows the results are 0.21 mL / s when no load and when given a maximum load of 16 kg is 0.3 mL / s.Keywords: Line boat, ship prototype, ship power, ship speed.

Kaji Eksperimental Sistem Sirkulasi Air Tanaman Hidroponik Tenaga Surya Neylan Nurina; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The circulation of water in hydroponic crops is one ting that is very important in hydroponic plant cultivation, because the circulation of water is needed by plants. Hydroponic water needs at less than the water needs of plants cultivated in the ground. Hydroponics is defined as a way of farming without using soil. The circulation of water in the hydroponic growing methods required pembuatanya system design with the motor as the driving force of water flow, and solar panels as a powerhouse. Solar panels are one type of alternative energy that utilizes the power from solar energy into electrical energy. The motors used to circulate water are aquarium motors or aquarium pumps, the pump capacity used in this research is 25 watts with head 1.2 meters (maximum) and water debit 1300 liter / hour.Keywords: Hydroponics, Solar Panels, Submersible Water Pump.

Kaji Eksperimental Rugi-Rugi Aliran Campuran Partikel Padat-Udara Dalam Saluran Horizontal Pada Sistem Pneumatic Conveying D.Erianto Simanjuntak; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Pneumatic Conveyor is a System used to move solid particle from one site to another with air as a medium of transportation.Phenomenon that occurs in Pneumatic Conveying flow systems such as: Pressure losses, channel erosion, formation of deposits on the channel and so on. Channel erosion is seen getting bigger at the bottom of the channel. Besides that solid particles tend to be more concentrated in the bottom of the channel.Testing by varying the flow rate of mass and type of dust by regulating the opening of the channel entrance, the velocity of air flow, resulting in that increasing this variation can increase the pressure drop Channel erosion becomes large when the concentration of dust increases in flow. At the time of testing if there is a buildup in the bottom of the dust channel the system exits longer (transport is not smooth). Then the dust attached to the blower blade will be a new problem for the system. So thus increasing the concentration of dust in the flow can affect the performance of the system.Keywords: Pneumatic Conveying, Dust (Particles), Pressure drop.

Pengujian Pompa Spiral Dengan Kincir Air Pada Aliran Irigasi Marwanto Marwanto; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Irrigation water flow can be utilized by installing a tool that is a waterwheel. Now it has been developed in the form of a water wheel pump, where this water pump serves to pump water without using electrical energy but with the help of irrigation flow. The aim of this research was know the characteristics of spiral pump and efficiency of spiral pump with waterwheel. The method used an experimental research that was test directly in the field. The waterwheel used a type of undershot flat blade 2 m diameter with 18 pieces of blade. The flexible hose was 38.1 mm diameter with a total coil of 4.55 windings, and an input diameter of 76.2 mm. The highest flow rate was 0.29 m3/s, the highest spiral pump discharge output was 0.27 l/s with a spiral pump efficiency of 1.54 % and the head was 3.38 m. The lowest flow rate was 0.11 m3/s, the lowest spiral pump discharge output was 0.15 l/s with a spiral pump efficiency of 0.81% and the head was 1.21 m. Therefore, the irrigation flow is influence of the rotation of shaft, the discharge of pump, efficiency and head spiral pump.Keyword: spiral pump, flow rate, head, efficiency.

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