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Articles 22 Documents
ANALISIS TEKANAN TANGKI SPRAYER DENGAN VARIASIBESAR DIAMETER RODA DAN PANJANG TUAS ENGKOL PELUNCUR DENGAN MENGGUNAKAN SATU POMPA PADA SPRAYER SEMI OTOMATIS Priyatmoko, Aris; Widodo, Sri; Salahudin, Xander
Wahana Ilmuwan Vol 1, No 1 (2016): Wahana Ilmuwan
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Sprayer merupakan alat aplikator pestisida yang diperlukan dalam  pemberantasan dan pengendalianhama dan penyakit tumbuhan. Hasil studi yang dilakukan Departemen Pertanian bahwa di beberapa tempat di Indonesia, sprayer tipe gendong sering mengalami kerusakan. Permasalahan lain yaitu sprayer yang digunakan masih harus digendong, sehingga berat sprayer menjadi kendala yang dialami petani. Penggunaan sprayer yang menggunakan motor bensin atau baterai sebagai sumber tenaga, akan meningkatkan biaya operasional dan perawatan yang tinggi. Dari permasalahan tersebut, muncul ide untuk berinovasi terhadap knapsack sprayer, dengan modifikasi menjadi sprayer semi otomatis, yang dalam penggunaanya anti gendong dan hemat energi. Sprayer semi otomatis akan menjawab kebutuhan dan masalah yang dihadapi petani, yaitu lebih hemat biaya perawatan, lebih efisien dalam penyemprotan tanaman, dan lebih ringan dalam penggunaan.Prinsip kerja dari sprayer semi otomatis adalah pemanfaatan gaya hasil gerak rotasi roda yang dirubah menjadi gerak translasi yang menggerakkan batang pompa untuk pemampatan udara. Hal ini dapat terjawab dengan sistem mekanisme engkol peluncur. Udara yang dihasilkan pompa disalurkan kedalam tangki melalui selang udara, selanjutnya dicampur dengan fluida yang akan disemprotkan. Penggunaan sprayer semi otomatis akan memudahkan petani, karena hanya perlu mendorong kereta.Dimensi sprayer semi otomatis dibuat dengan ukuran panjang 110 cm, lebar 37 cm dan, tinggi 97 cm sehingga dapat digunakan pada area pertanian tanaman cabai, dan sayur- sayuran yang umumnya mempunyai jarak 60 cm antar blok tanaman. Guna penelitian, pada sprayer semi otomatis diaplikasikan 4 jenis variasi yang masing-masing dihasilkan dari roda berdiameter 12 inch dan 14 inch, dan panjang tuas engkol peluncur 8,5 cm dan 10 cm.
STUDI EKSPERIMENTAL PEMBANGKITAN GAYA MAGNETIK PADA KUMPARAN BERARUS DALAM MEDAN MAGNET NEODYMIUM Arnandi, Wandi; Iswahyudi, Sigit
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
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This research is a preliminary study to develop a magnetic force generator as a thrush force of vehicle. The purpose is to investigate the effect of electric current and coil diameter on the generation of magnetic force of current-carrying coilconductor in magnetic field of neodymium magnet. To reach the goal, a magnetic circuit and three coil which havea difference of coil diameter were made and tested. The coilswere made of laminated copper wirewhich have 1,1 mm in diameter and 3000 mm length. The coil diameter was varied 35 mm, 38 mm, and 50 mm. The source of magnetomotive force in the magnetic circuit was cylindrical neodymium magnet.The source of dc current was power supply which can produce 30 ampere of output dc current and output voltage that can be varied. The electric current in the coil was set up 1,0 ampere; 2,0 ampere; 3,0 ampere; 4,0 ampere; 5,0 ampere; 6,0 ampere; and 7,0 ampere. Testing was carried out by flowing current in the coil which placed in the magnetic flux of magnetic circuit and then magnetic force produced by the coil was measured using spring scale in unit of Newton. Result shows that the magnitude of magnetic force produced by thecoil is directly proportional tothe magnitude of electric current and coil diameter.
ANALISIS DEBIT POMPA HIDRAM DENGAN PIPA PARALON SATU OUTPUT, DUA OUTPUT DAN TIGA OUTPUT DENGAN DIAMETER PIPA ¾ INCH Najib, Umar
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
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Indonesia is an agricultural country with abundant water. But not all regions in Indonesia can get water easily, especially in hilly areas with springs that are lower than a place to stay. Water is the most important tool in life. Water alone will only flow from a high place to a lower place and certainly an area that has a higher location of water sources will easily meet their daily water needs. The fact has shown that there are many rural areas that have difficulty providing water, both for domestic use and for farming activities due to a water source is lower than a place to stay.At first the hydraulic ram is very popular because of its ease and simplicity in maintenance. But, due to technological progess is very rapidly and also the level of dependence on the higher electrical, hydraulic ram began to be ignored. Along with the increasing attention to equipment that uses renewable energy saving, hydraulic ram began to glance back. From these problems the writer made and did the research about hydraulic ram using the pipe with the diameter of the pump body ¾ inch and output diameter ½ inch. Knowing debit and efficiency of pumps with three variations are made. The trial and the research for the pumps carried out about ten times for each variation about 15 seconds. The pump discharge output Q = 0.007 l/sec. Two output Q1 = 0.005 l/sec and Q2 = 0.002 l/sec. Three output Q1 = 0.003 l/sec, Q2 = 0.002 l/sec and Q3= 0.0018 l/sec. Pump efficiency is 0,16% of the output, two pump output is 0,1143% and 0,0457%, and for the three pump output is 0,0686%, 0,0457% and 0,0411%.
KAJIAN KINERJA MESIN PENCAMPURAN PAKAN TERNAK MENGGUNAKAN DAYA 0,25HP Pramono, Catur
Wahana Ilmuwan Vol 2, No 2 (2016): Wahana Ilmuwan
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Livestock sub-sector, which is part of the agriculture sector is a strategic sector in supporting the regional and national economy. Availability of both imported and local meat is closely related to national food security. Fulfillment of meat to meet as a producer of animal protein consumption is useful in terms of health and human intelligence. UNICEF recognizes that nutrition is based on theprotein supply has contributed about 50% of economic growth in developed countries. The purpose of this study is to assess the performance good fodder mixing machine for mixing feed cows, goats, and poultry. The test results indicate that the machine is able to mix until homogeneous within 5 minutes 10 seconds to feed cattle with a mass of 2.8 kg, 3 minutes 6 seconds to feed the goats with a mass of 4.1 kg, and 1 minute 49 seconds for poultry feed with a mass of 5kg.
Kapasitas Pengeboran Kayu Jati, Mahoni, Akasia Menggunakan Daya Motor Listrik 250Watt Pramono, Catur; Suharno, Kun; Purnomo, Purnomo
Wahana Ilmuwan Vol 1, No 1 (2016): Wahana Ilmuwan
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Mesin perkakas biasanya berhubungan dengan suatu industri yang pada dasarnya alat tersebut sangat membantu menyelesaikan suatu pekerjaan yang berhubungan dengan industri. Salah satu contohnya adalah padahome industry kerajinan tangan khususnya industri pengrajin sangkar burung. Home industry tersebut terdapat di desa Prajegsari dan Pakis, Kabupaten Magelang. Tujuan penelitian ini yaitu untuk menciptakan prototype mesin pengebor dengan menggunakan satu motor listrik. Selain itu juga dapat mengetahui performa mesin pengeboran untuk kayu jati, mahoni, dan akasia.Metode pelaksanaan pembuatan mesin tiga fungsi yaitu berupa persiapan, perencanaan, persiapan bahan untuk konstruksi mesin, pengadaan motor listrik, chuk/pengait, papan kayu, plat, baja dan handle. Tahap berikutnya adalah assembling mesin dan kedudukan mesin dan dilanjutkan dengan prototype mesin tiga fungsi. Selanjutnya dilakukan pengujian terhadap mesin tersebut, setelah itu dilakukan analisis data, pembahasan dan seminar beserta laporan.Hasil penelitian bahwa kapasitas pengeboran kayu jati 8,27 (mm3/s), mahoni 24,88 (mm3/s), akasia 11,17 (mm3/s). Secara visual hasil pengeboran menunjukkan lubang bulat sempurna tanpa ada kekasaran pada permukaan hasil pengeboran.
STUDI PEMBANGKITAN TORSI PADA CAKRAM BAJA MENGGUNAKAN GAYA-MEDAN MAGNET NEODYMIUM Iswahyudi, Sigit; Arnandi, Wandi
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
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This works is a preliminary study that evaluates probability of torque generation in steel disc by field force of neodymium magnet. The study was started by analyzing ferromagnetic disc that is surrounded by magnets. In simulation, the disc had a diameter of 400 m and was made of S416. The magnets used in the simulation had cubed form and length of 10 mm. The magnets were placed around the disc in such a way that the center of their poles made an angle of 42 degrees from the disc radii. The nearest distance between center magnet poles to the center of the disc was 210.6 mm. There were six configurations of magnets to be evaluated, i.e. configurations of 1, 2, 4, 8, 16 and 32 magnets. Effects of magnet configurations on torque generation in the disc were evaluated by using MagNet software. Simulation results show that the highest torque was achieved by 16 magnet configuration.
ANALISIS MESIN PEMIPIH MELINJO MENGGUNAKAN MOTOR LISTRIK ½ HP DENGAN VARIASI KECEPATAN PUTARAN Ardiyanto, M Rozak; Salahudin, Xander; Widodo, Sri
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
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Melinjo (Gnetum gnemon L) is one of plantation crops are quite numerous in the island of Java. All parts of this plant can be used, especially “melinjo”seeds that can be processed into melinjo. Efforts to meet the needs of export are often hampered by the high level of orders, but less can be offset by craftsmen, because the manufacturing processes are done manually (by hand). Need to do a business improvement order “melinjo”production rate can be increased so as to meet consumer needs without reducing the quality of the result. Based on these problems, the research about how the influence of variation the round of the machine time flat. This research was conducted by comparing the engine performance flat with variations of each round of 15 rpm, 20 rpm and 30 rpm. The work principle of the machine is to utilize the electrical energy is converted into energy by the motor rotating and the subsequent rounds to the gearbox by using v-belt. Gearbox used have value ratio 1:50. Round gearbox forwarded to the dish not a flashlight. Then from the disk is not transmitted to the wheels small flashlight. Then of small wheels forwarded flat pipe. By harnessing the power of the dish not to be flattened pipe flashlight with full force. It is intended that “melinjo”that goes into the mold table can flat by flatten pipe. The result of this research is the optimal rotational speed was at 30 rpm. The results of the thickness of the nicest on a 30 rpm rotation that is with an average thickness of 1.75 mm. Flat engine capacity “melinjo” best at a  speed of 30 rpm, with the data was 1,086 kg / hour.
PENGARUH VISKOSITAS OLI TERHADAP KEKERASAN DAN STRUKTUR MIKRO BAJA 60 Setyo, Noor
Wahana Ilmuwan Vol 2, No 2 (2016): Wahana Ilmuwan
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This study aims to determine the effect of cooling medium in the quenching process on the level of the surface hardness of steel alloy ST 60 has a composition of 0.45% C, 0.33% Si; 0.43% Mn. While as the cooling medium varisi sequentially used oil SAE 20; SAE 40; and SAE 60. Quenching heating process is done by heating the steel in the furnace heated to a temperature of austenite 7500C, being the quenching process is performed by using the oil cooler media SAE10; SAE 40; and SAE 80. The surface hardness before and after quenching is known to test the micro Vickers on a load of 150 grams, while the microstructure observation was performed using an optical microscope magnification of 200 x.Results showed a linear relationship between the level of violence to the level of dilution oil cooler. Material surface hardness increased with the increasing rate of the cooling medium viscosity. Sequentially large surface hardness of the thinned oil SAE 10; SAE 40; and SAE 80 is obtained 175VHN0,015; 179 VHN0,15; dan 195VHN0,015. The microstructure of the experience was change of pearlite into cementite with a higher level of dilution cooling medium.
PENGARUH KEKUATAN PENGELASAN PADA BAJA KARBON AKIBAT QUENCHING Subkhan, Nur; Suharno, Kun; Mulyaningsih, Nani
Wahana Ilmuwan Vol 1, No 1 (2016): Wahana Ilmuwan
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Studi kekuatan tarik pada sambuangan las telah dilakukan pada baja karbon rendah yang dilakukan quenching. Tujuan studi ini adalah menguji kekuatan tarik pada sambungan kualitas las. Dari hasil perbandingan pengujian kekuatan material tersebut memperlihatkan perbedaan yang signifikan antara baja karbon rendah yang di quenching menggunakan media air, oil dan angin. Tegangan ultimate (kg/cm2) nilai regangan (%) pada baja karbon rendah menggunakan media air, media oli dan media udara menunjukkan perbedaan kekuatan tarik. Baja karbon rendah yang diquenching menggunakan media air memiliki hasil yang lebih baik dibandingkan dengan baja karbon rendah yang diquenching menggunakan media oli dan media udara. Sementara baja karbon rendah yang diquenching menggunakan media udara memiliki hasil yang lebih baik dibandingkan dengan baja karbon rendah yang diquenching menggunakan media oli.Pada baja karbon rendah yang diquenching menggunakan media air didapat tegangan ultimate sebesar 3,88 kg/cm2 dan beban yang dapat ditahan adalah 699,33 kg, baja karbon rendah yang diquenching menggunakan media oli adalah  2,20 kg/cm2 , beban yang dapat ditahan adalah 397,33 kg , yang terakhir untuk benda uji yang diquenching menggunakan media udara tegangan ultimate sebesar 2,83 kg/cm2 dan beban yang dapat ditahan adalah 510,67 kg.Nilai regangan yang didapatkan pada hasil pengujian juga memperlihatkan bahwa baja karbon rendah yang diquenching menggunakan media air memiliki kekuatan yang lebih tinggi, yaitu 0,056 % lebih besar dari media 0il 0,48 % dan udara 0,055 %
ANALISIS DEBIT AIR PIPA BERCABANG 4 DAN 5 PADA PIPA TUNGGAL DENGAN SATU TITIK JUNCTION SEBAGAI ALTERNATIF PENGGUNAAN PIPA BERCABANG Sulisyanto, Eko; Suharno, Kun; Widodo, Sri
Wahana Ilmuwan Vol 2, No 2 (2016): Wahana Ilmuwan
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Water is a basic necessary for life of all living beings in this world, especially humans. Water for human needs streamed from a high place to a lower place by utilizing a high pressure difference (head) or drained using a pump from a lower to a high place. The water flowed through pipes. But often we see the installation of pipes branching less regulated and do not pay attention to the effects that arise as a result of these subdivisions. In the market, there are branching pipe branched pipe usually only two or at most three, not yet branched pipe 4 and 5. Therefore, how it affects the flow of water with the same head?The results of this research the neighbor pipes branched 4 and 5 as an alternative pipeline branching in order to determine the flow of water in each pipe branched 4 and 5, knowing the losses that occur in the installation of pipelines and comparing the results of the study theoretically and the results in practice. The method in this results include preparation, tank, pipe installation, implementation discharge measurements, data analysis, reporting, and publication. To obtain data on discharge measurements using the volumetric method.The results of the branched pipe 4 obtained Q2 = 0.11 l/sec (36.66%), Q3 = 0.05 l/sec (16.67%), Q4 = 0.05 l/sec (16 , 67%), Q5 = 0.09 l/sec (30.00%). In the branched pipe 5 obtainedQ2 = 0.10 l/sec (32.26%), Q3 = 0.04 l/sec (12.90%), Q4 = 0.04 l/sec (12.90%), Q5 = 0.08 l/sec (25.81%), Q6 = 0.05 l/sec (16.13%). Losses that occur in the flow in the pipe inlet cover loss, loss curves, friction loss, loss of downsizing the pipe, and the pipe loss enlargement. Calculation of water discharge theoretical and practical results on the ground show the same value that is 0.3 liters/sec.

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