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All Journal Jurnal Teknik Mesin Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Wahana Ilmuwan Jurnal Elemen JURNAL CRANKSHAFT Majamecha Jurnal Foundry Journal of Engineering and Technological Sciences
Sigit Iswahyudi
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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STUDI EKSPERIMENTAL PEMBANGKITAN GAYA MAGNETIK PADA KUMPARAN BERARUS DALAM MEDAN MAGNET NEODYMIUM Wandi Arnandi; Sigit Iswahyudi
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
Publisher : Wahana Ilmuwan

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Abstract

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.
STUDI PEMBANGKITAN TORSI PADA CAKRAM BAJA MENGGUNAKAN GAYA-MEDAN MAGNET NEODYMIUM Sigit Iswahyudi; Wandi Arnandi
Wahana Ilmuwan Vol 3, No 1 (2017): Wahana Ilmuwan
Publisher : Wahana Ilmuwan

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Abstract

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.
Kajian Teoretis Kerutan di Daerah Tekukan pada Pipa Hasil Proses Bending Sigit Iswahyudi
Jurnal Teknik Mesin (Sinta 3) Vol. 14 No. 1 (2013): APRIL 2013
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

Kajian ini membahas pemanfaatan teori buckling plastis untuk memperkirakan kapan mulai terjadi kerutan pada proses penekukan profil khususnya pipa. Profil atau pipa yang ditekuk dilokalisir pada bagian yang mendapatkan beban tekan kemudian dianalogikan sebagai kolom yang mendapatkan beban tekan. Pipa dengan rasio tebal dibanding diameter luarnya dengan nilai di atas 0,1 akan mengalami kerutan plastis. Metode tangent modulus, metode shanley dan metode reduced modulus digunakan untuk memperkirakan kapan mulai terjadi pembentukan kerutan. Hasil analisa menunjukan bahwa perkiraan pembentukan kerutan dengan menggunakan reduced modulus lebih cepat dari pada dengan menggunakan metode shanley dan tangent modulus. Persentase perbedaan jari-jari penekukan di mana kerutan mulai timbul antara hasil analisa menggunakan metode reduced modulus dengan tangentmodulus dibanding tangent modulus adalah 95%. Sementara itu, persentase perbedaan jari-jari penekukan antara hasil perhitungan menggunakan metode shanley dengan tangent modulus dibanding metode tangent modulus adalah 39%.
MEKANISME PEMBENTUKAN KERUTAN PADA PROSES PENEKUKAN PIPA Sigit Iswahyudi
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2011): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 2 2011
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Pengerutan dan perubahan geometri penampang merupakan hal yang menyebabkan kegagalan pada proses penekukan pipa. Untuk menghindari kegagalan proses, perlu diketahui mekanisme proses pembentukan kerutan, perubahan geometri penampang dan batasan- batasannya. Pada tulisan ini dibahas mekanisme pembentukan kerutan melalui pendekatan mekanisme buckling pada penekukan pipa. Pengaruh rasio tebal pipa-diameternya dan rasio tebal pipa-radius penekukan terhadap stabilitas geometri pipa dihitung. Kata kunci: penekukan, pipa, buckling, kerutan
PENINGKATAN PRODUKTIVITAS SEL SURYA DENGAN MEMANFAATKAN PARABOLA SEBAGAI KONSENTRATOR Sigit Iswahyudi; Kun Suharno; Agung Trihasto
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2010): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 1 2010
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Solar cell is engineered to convert photon energy of the sun that the earth get it on terrestrial zone. Usually, in laboratory, solar cell will be irriadiated by 1 kW/m2 constant photon source to standardize the product and photovoltaic energy become the output. The productivity of solar cell then be restricted by the photon energy input.In this discussion, the productivity of solar cell will be enhanced by using parabolic concentrator. The restriction of input is broken down by raising the intensity of photon radiation.Key words: solar radiation, parabolic concentrator, solar cell, photovoltaic energy
KARAKTERISTIK PROKSIMAT BRIKET KULIT SINGKONG DAN TEMPURUNG KELAPA DENGAN VARIASI PEREKAT TETES TEBU (MOLASE) Rizky Hermawan; Endang Mawarsih; Sigit Iswahyudi; Arif Rahman
JURNAL FOUNDRY Vol. 6 No. 2 (2023): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62944/jf.v6i2.79

Abstract

Untuk meningkatkan nilai jualnya, limbah kulit singkong dapat diolah menjadi briket arang. Kulit singkong memiliki nilai kalori sebesar 3843,84 kal/gram, sehingga cocok digunakan sebagai bahan utama dalam pembuatan briket arang. Metode yang digunakan pada penelitian ini adalah eksperimen dengan membuat briket dari campuran kulit singkong dan tempurung kelapa dengan tetes tebu. Briket yang telah dicetak dengan variasi perekat yang telah ditentukan selanjutnya akan dilakukan pengujian terhadap nilai kalor, kadar air, kadar abu, volatile matters dan fixed carbon. Dari penelitian yang telah dilakukan menggunakan Variasi menggunakan perekat tetes tebu dengan variasi 5%, 7%, dan 9% didapatkan karakteristik briket Rata-rata nilai kalor yang paling rendah ada pada presentase perekat 7% dengan nilai rerata 5520,688% kal/g. Sedangkan Kadar air tertinggi briket kulit singkong dan tempurung kelapa paling tinggi didapat dalam presentase perekat 9% pada nilai 5,4823%. Kadar abu didapatkan didalam presentase perekat 5%, pada nilai 15,1314 %, Volatile matters briket memiliki rata-rata nilai paling rendah didapatkan pada konsentrasi perekat 7% dengan nilai 10,79211% , Volatile matters briket memiliki rata-rata nilai paling rendah didapatkan pada konsentrasi perekat 7% dengan nilai 10,79211%, fixed carbon kulit singkong dan tempurung kelapa memiliki ratarata nilai paling rendah didapatkan pada konsentrasi perekat 9% dengan nilai 67,3862%.
ANALISIS KINERJA KOMPOR GAS BERBAHAN BAKAR DIMETHYL ETHER DENGAN VARIASI DIAMETER LUBANG ANGIN PADA NOSEL Sutrisno, Seno; Sigit Iswahyudi; Rany Puspita Dewi
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1662

Abstract

The use of a vent on a gas stove affects the mixing of air with fuel. This study examines the effect of different vent diameters on the performance of Dimethyl Ether (DME) gas-fueled stoves. A nozzle with variations in vent diameter of 3 mm, 2 mm, 1 mm, and no vent with a nozzle diameter of 0.96 mm at each vent. Installed on the fuel ignition system, the flame, heat intake, and combustion efficiency were tested. From the test results at a pressure of 280 mmH2O, the highest flame noise value after shutdown was obtained at the nozzle with a 1 mm vent which amounted to 64.2 dB, the highest heat intake value at the nozzle with a 1 mm vent which amounted to 1.6625 kW, and the highest efficiency value at the nozzle with a 3 mm vent which amounted to 59.135%.
ANALISIS MESIN ROTARY DRYER UNTUK PENGERINGAN BAHAN BAKU PELET REFUSE DERIVED FUEL (RDF) MENGGUNAKAN SOFTWARE SIMULATION ANSYS Dzikron Muchlisin; Rahman Saleh, Arif; Iswahyudi, Sigit; Mujiarto, Sigit
JURNAL FOUNDRY Vol. 7 No. 1 (2024): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62944/jf.v7i1.80

Abstract

Badan Pusat Statistik Kota Magelang pada tahun 2018 menyatakan sebanyak 121.872 jiwa. banyaknya penduduk mempengaruhi mengakibatkan sampah yang semakin melonjak. Total jumlah volume sampah di Kota Magelang sebanyak 280,19m^3 dengan komposisi sampah RDF (Refuse Derived Fuel) sebesar 72,6%, sampah plastik sebesar 9,65%, dan sampah kertas 8,25% (BPS, 2016 dalam Kota Magelang Dalam Angka 2016). Mesin pengering “rotary dryer” ini bekapasitas 30 kg dengan silinder drum pengering berdimensi 90 cm X 60 cm serta memiliki ketebalan dinding 4 mm, dilengkapi saluran masuk, burner, blower, motor listrik 1 HP yang ditranmisikan dengan gear box, dan bahan bakar LPG. Berdasarkan hasil simulasi Ansys yang telah dilakukan dengan suhu 330°C pada Aluminium Alloy 6061 dengan kecepatan putar tabung 1100 rpm. Saluran masuk diatur dengan kecepatan 15 m/s dan dipengarungi gaya grafitasi 9,81 m/s setelah disimulasikan menghasilkan temperatur maksimum sebesar 330,0316 °C dan nilai minimum 30,638°C, kemudian untuk kecepatan velosity menghasilkan nilai minimal 72.65794 m/s dan nilai maksimum sebesar 142.2872 m/s. Hasil uji equivalent stress maximum (von mises) simulasi Finite Element Analysis (FEA) dengan tekanan yang didapatkan dari kapasitas 30 kg dan berat tabung pengering 30,25 kg. Sehingga hasil nilai von mises yang terjadi pada sebesar 0.32553 MPa.
Aerodynamic Performance and Noise Characteristics of Modified Blade Tip of Small HAWT Sigit Iswahyudi; Setyawan Bekti Wibowo; Suyitno Suyitno; Agus Suprihanto
Journal of Engineering and Technological Sciences Vol. 56 No. 5 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.5.8

Abstract

The planform design of a wind turbine blade influences its aerodynamic performance and noise characteristics, with the tip shape controlling vortex shedding, power, and noise. This study examined the tip shape’s effect on a small horizontal-axis wind turbine (HAWT). Field tests were conducted on three rotors: one with straight blades, one with low swept angle (12° and 61° sweep, 15° anhedral) blades, and one with high swept angle (32° and 72° sweep, 15° anhedral) blades. All had three blades, a tip speed ratio (TSR) of 5.24, and an NACA 4412 cross-section. The basic blade rotor and the modified blade 1 rotor had a 2.1 m diameter, while the modified blade 2 rotor had a 2.8 m diameter. The modified blades had revised tips along 10% of the radius. The results showed maximum power coefficients of 0.25, 0.2, and 0.15 for the basic blade, modified blade 1, and modified blade 2, respectively. modified blade 2 exhibited the best starting behavior, needing only 1 m/s wind speed. It also reduced low-frequency noise while increasing high-frequency noise, which is more effectively absorbed by the atmosphere. The swept blade tips lowered power performance but improved start-up and reduced low-frequency noise
ANALISIS VARIASI KEMIRINGAN SUDUT TURBIN SINGLE BLADE TERHADAP EFISIENSI DAN DAYA PADA ARCHIMEDES SCREW MENGGUNAKAN COMPUTIONAL FLUID DYNAMICS (CFD) Ahmad, shofiyuddin Ali; Fajarningrum, Nurmala Dyah; Iswahyudi, Sigit
ELEMEN : JURNAL TEKNIK MESIN Vol. 11 No. 2 (2024)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v11i2.291

Abstract

The potential for renewable energy in Indonesia is abundant, such as water energy. This energy potential can be used for Micro Hydro Power Plants (PLTMH). This study aims to study the effect of turbine head angle and screw angle parameters on the efficiency and power of screw-type water turbines. The angles used are turbine shaft angles of 20 °, 25 °, and 30 ° at screw angles of 22 ° and 26 °. Then a design was made using Autodesk Inventor and then simulated using Ansys software. The results of the study showed that the greatest power and the greatest turbine efficiency were obtained at a screw angle of 26 ° with a turbine shaft angle of 30 ° with a power value of 80072.98 watts and an efficiency of 95.37%. While the lowest power and efficiency were at a screw angle of 22 ° and a shaft angle of 20 ° with a power value of 72643.44 watts with an efficiency of 86.52%. So from this research, it was found that the good angle value is at the variation of the thread angle of 26° and the turbine shaft angle of 30°.
Co-Authors Agung Trihasto Agus Suprihanto Ahmad, shofiyuddin Ali Arif Rahman Darmo, Adityo Noor Setyo Hadi Dewi, Rany Puspita Dwicahya, Muhammad Ridwan Rio Dzikron Muchlisin Endang Mawarsih Fajarningrum, Nurmala Dyah Kun Suharno Muhaimin, Rijal Arif Nafi', Zuhdi Baghiz Zain Nur Hayati Nurhadi Prayoga, Kurniawan Bayu Purnomo , Sigit Joko Rahman Saleh, Arif Rany Puspita Dewi Rizky Hermawan Setyawan Bekti Wibowo Setyawan, Fajar Andre Sigit Mujiarto Sutrisno, Seno Suyitno Suyitno Syarif Hidayat Taufik, Ikhwan Trisma Jaya Saputra Wandi Arnandi