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All Journal Jurnal Teknik Mesin International Journal of Renewable Energy Development Niagawan Bulletin of Electrical Engineering and Informatics Jurnal Kelautan : Indonesian Journal of Marine Science and Technology KURVA S JURNAL MAHASISWA Rekayasa Mesin Journal of Engineering and Management in Industrial System Business UHO: Jurnal Administrasi Bisnis Jurnal IUS (Kajian Hukum dan Keadilan) Journal of Accounting Science JMBI UNSRAT (Jurnal Ilmiah Manajemen Bisnis dan Inovasi Universitas Sam Ratulangi) Jurnal Media Elektro : Journal of Electrical Power, Informatics, Telecommunication, Electronics, Computer and Control System SENTRALISASI JMKSP (Jurnal Manajemen, Kepemimpinan, dan Supervisi Pendidikan) Unnes Journal of Public Health JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Jurnal Ilmiah Akuntansi Kesatuan International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Asean Journal of Science and Engineering (AJSE) Journal of Social Research Jurnal Keuangan dan Perbankan(KEBAN) Jurnal Abdi Mandala Hexatech: Jurnal Ilmiah Teknik Journal Research of Social Science, Economics, and Management Eduvest - Journal of Universal Studies Jurnal Ilmiah Pangan Halal International Journal of Renewable Energy Development Jurnal Penelitian Pendidikan Indonesia Journal of Fisheries & Marine Journal of Transportation and Society Empowerment
Slamet Wahyudi
Universitas Brawijaya
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Neuroscience Public Health Social Sciences Transportation Other

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Pengaruh Hambatan Cincin Terhadap Fenomena Flooding Dalam Aliran Dua Fase Berlawanan Arah Pipa Vertikal Robbi, Nur; Wahyudi, Slamet; Widyanuriyawan, Denny
Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Two-phase flow is widely used in daily life and industry, such as the installation of sludge pumps that drain liquid and solid or on the installation of air condition that drain freon fluid in the gas and liquid phase. However, in the two-phase flow also did not rule out the occurrence of barriers, barriers occur because of the crust, reduction and enlargement of the pipe. Besides that the twophase flow is also very useful as a coolant in the pipeline contained hot phase therein. In a Variation of ring barriers Dp/Dc = 1,Dp/Dc=1,06,Dp/Dc=1,125 and Dp/Dc=1,2, the fluid is streamed from the top passing through the water injector, while the air from the compressor is streamed from the down through the air injector. Water pressure ranging from 3-6 L/min and the air was varied ranging from 3-10 L/s. The test results obtained the flooding phenomenon that occurs because of the pressure difference in the pipe that causes fluid that move from the top through the injector can not go down but it back upwards because of the air pressure is greater than the water. In the ring barriers Dp/Dc = 1,Dp/Dc=1,06,Dp/Dc=1,125 and Dp/Dc=1,2, the fastest flooding phenomenon occurs on the ring barriers Dp/Dc=1,2 in water debit 6 L/min, air 6 L/s, this is because the bigger barriers make the occurrence of the phenomenon of flooding be faster, flooding phenomenon is also due to pressure differences in the test tube, the bigger debit of air and water make the flooding phenomenon be faster.Keywords: The phenomenon of flooding, air and water discharge, pressure differences
Pengaruh Jumlah Sudu Terhadap Optimalisasi Kinerja Turbin Kinetik Roda Tunggal Pietersz, Richard; Soenoko, Rudy; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Indonesia has a great potential to develop hydropower, because Indonesia's mountainous topography and hilly and is drained by numerous rivers (large and small), and in certain areas t here are lakes or reservoirs and the potential of water as an energy source. Hydroelectric Power Plant (PLTA) is a technology that has been proven to not harm the environment, support the diversification of energy as renewable energy, support the use of fuel reduction program, and most of the construction using local materials. Kinetic Turbine is one of the options in utilizing the potential of the kinetic energy in the form of velocity, kinetic studies using vertical shaft turbine, blade-shaped bowl that can withstand the flow in order to increase the tangential force generated. Amount of kinetic turbine blades is one of the variables that affect the rotation and tangential style of a turbine, so the effect on the value of the power and efficiency of a kinetic turbine. The results showed the influence of the number of blades on the power and efficiency of blade number 5, 7, 9 and 11,where the number of blades 11 have a greater influence than the number of blade 5, 7 and 9.Keywords: Water turbine, number of blades, performance
Pengaruh Ketebalan Inner-Helical Fin Terhadap Charcteristic of Performance pada Head Exchanger Usman, Ishak; Wahyudi, Slamet; Argo, Bambang Dwi
Jurnal Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Effect of inner-helical fin on the rate of heat transfer and flow friction factor in a double pipe heat exchanger (double tube heat exchanger) to make a split and disrupt the flow pattern of a streamlined flow of the fluid flowing in the pipe section in the (inner tube) that cause turbulence (molecule-molecule level of randomness good fluid) that can increase the heat transfer rate in the the pipe . Inner-helical fin has a varied thickness of 1 mm, 22 mm and 3 mm are mounted on the pipe where the inside diameter of the inner-helical fin attached to the wall in the inner pipe. Hot water discharge on the inner pipe ditelitil ranging from 400 to 900 liters / h with interval increase in 100 liter / hour and the volumetric flow rate of cold water on the outer tube (outertube) is kept constant 900 liters / hour. The test results of each inner-helical fin thickness compared with the test results without the inner-helical fin (plain tube) and obtained the overall heat transfer rate has increased 60 to 65% of the plain tube, heat exchanger effectiveness of58.56 to 63, 64% and friction factor of 63.13 to 63.51 of the plain tube.Keywords : Inner-helical fin, Heat exchanger, rate of heat transfer, friction factor
Penerapan Overall Equipment Effectiveness (Oee) Dalam Implementasi Total Productive Maintenance (TPM) (Studi Kasus di Pabrik Gula PT. “Y”.) Rahmad, Rahmad; Pratikto, Pratikto; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In agro-industrial sector especially in sugar factory called PT. “Y”, improvement of manufacturing system is one of an improvement effort that intensively conducted so that later it could responds rapidly to market changes. The company always attempt to improve productivity, one of the way that has been done is implement preventive and corrective maintenance. But in fact, the outcome hasn’t reached the expectation yet. This research found that allocated time to do breakdown maintenance is the main problem, so that most of the corrective action focused in this problem. This research used OEE measurement, Six Big Losses calculation analysis, and also cause-effect diagram to look for existing problem and to give proposed improvement for the problem. As the result, the biggest factors affecting the low effectiveness of machine is reduced speed and breakdown loss so that the proposed improvement action is implementing TPM.Keywords: Preventive Maintenance, Overall Equipment Effectiveness (OEE), Autonomous Maintenance, Total Productive Maintenance (TPM).
Pengaruh Sudut Pengarah Aliran dan Jumlah Sudu Radius Berengsel Luar Roda Tunggal terhadap Kinerja Turbin Kinetik Maidangkay, Adrian; Soenoko, Rudy; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The aimof this research was to know kinetic turbine performance feat influence onguide angle of the water input flow and the amount of outter radius blade hinged of single wheel. Kinetic turbine was used in this research, it has vertical axes with three guide angle variations of 150, 250, and 350 and also the amount of blades is 8, 10 and 12. The results showed that the guide angle of flow and the amount of blades influence the kinetic turbine performance (power, efficiency, and torque). The guide angle of flow and the amountof blade out hinged radius of single wheel influences the kinetic turbine performance. From several angle variation of guide angle and the amount of blade out hinged radius of single wheel under observation, the turbine performance with guide angle of flow 350 higher than 250 and 150. The performance of 12 blades turbine is higher than turbine with blades of 10 and 8. The higher guides angle the more blades, the higher tangential force, torque, power and efficiency. The maximum performance of kinetic turbine occurs at the guide angle of flow 350, the blades amount 12, revolution 90 rpm, water capacity 50m3/hour and with produced power, efficiency and torque are 21.365 Watt, 33,241 %, and 3.864 N.m respectively.Keywords: Kinetic Turbine, Performance, Guide Angle of Flow, Amount of Blade
Pengaruh Diameter Inner-Helical Fin Terhadap Characteristic of Performance Counter Flow Heat Exchanger Bula, Muhamad; Wahyudi, Slamet; Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The study of energy conservation using the head exchanger with different fin shapes havebeen carried out, including research on the counter flow heat exchanger using a helical spiral shaped fin is placed on the inner pipe. The problem lies in the acquisition of the influence of the diameter of the helical fin to the characteristic of performance counter flow heat exchanger. The diameter of the helical fin which the test is 8 mm, 12 mm and 16 mm. The objective is achieved, the effect of the diameter of the helical fin characteristic of performance counter flow heat exchanger in the increase of hot water discharge 400 liters / hour, 500 liters / hour, 600 liters /hour, 700 liters / hour, 800 liters / hr and 900 liters / hour. Method of design of experiments with laboratory-scale experiments using a set-up equipment double tube heat exchanger is the method used. The results obtained, the highest effectiveness for all types of helical fins foundon discharge 400 liters / h with the order from highest to lower the effectiveness of internal diameter of 12 mm reached 17.66%, diameter of 8 mm effectiveness reaches 15:56% and the internal diameter of 16 mm effectiveness of achieving 14.29%. For the plain tube efektiftasobtained 11:48%.Keywords : heat exchanger, the diameter of the helical fin, hot water discharge, effectiveness
Pemodelan dan Verifikasi Aliran Dua Fase (Air-Udara) di Belokan 90° Nugraha, Arif Yunizar; Soenoko, Rudy; Wahyudi, Slamet
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Two phase flow in a piping installation is influenced by the interaction between phases, geometry and orientation (vertical or horizontal), flow direction (up or down) that may affect the flow pattern. In contrast to single phase flow which only influenced by the Reynolds number in the formula of density, viscosity and pipe diameter. So the two phase flow has an interesting phenomenon to be studied which is the result of the pressure drop to form a flow pattern. The purpose of this study are to determine the pressure drop that occurs in the 90° from the horizontal position to a vertical position, and to analyze the flow pattern of two-phase fluid (water-air) at 90° in computational simulation and visualization verified with the help of high-speed digital camera. This study used clear PVC pipe (CPVC) and acrylic (PMMA) material in the 90° curves--test section with the aim to observe the flow pattern visualization then analyzed through simulation modeling with ANSYS software and verified experimentally. The calculation of the pressure drop in the 90° curve calculated theoretically and experimentally so that research can be studied scientifically. There was relationship between the flow patterns of the amount of pressure drop in the two-phase flow curves 90° of the thickness of the interface. The bigger the thickness of the interface, the pressure drop decreases both theoretically and experimentally due to the friction between the interfaces associated with friction factor, in this case is influenced by the Reynolds number and its value is inversed so the greater proportion of the air volumetric (β) then the Reynolds water number (Re SL) will decrease and increases friction between phase, besides the back pressure in the curve also affect the thickness 90° interface.There is wavy flow or turbulence in the bottom of horizontal pipe when the flow is laminar, it because of gravitation and centrifugal force or twin eddy in the actual speed ratio ( 𝑣 𝐺 𝑣 𝐿) . The conditions influenced the flow pattern and pressure drop. The highest value of speed ratio ( 𝑣 𝐺 /𝑣 𝐿 ) is 1,824 at vSG 0,076 m/s and the lowest is 0,423 at v SG 0,025 m/s.Keywords: two phase flow; pressure drop; flow pattern and curves
Premixed Combustion of Kapok (ceiba pentandra) seed oil on Perforated Burner Wirawan, I.K.G.; Wardana, I.N.G.; Soenoko, Rudy; Wahyudi, Slamet
International Journal of Renewable Energy Development Vol 3, No 2 (2014): July 2014
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.3.2.91-97

Abstract

Availability of fossil fuels in the world decrease gradually due to excessive fuel exploitation. This situations push researcher to look for alternative fuels as a source of renewable energy, one of them is kapok (ceiba pentandra) seed oil. The aim this study was to know the behavior of laminar burning velocity, secondary Bunsen flame with open tip, cellular and triple flame. Premixed combustion of kapok seed oil was studied experimentally on perforated burner with equivalence ratio (φ) varied from 0.30 until 1.07. The results showed that combustion of glycerol requires a large amount of air so that laminar burning velocity (SL) is the highest at very lean mixture (φ =0.36) in the form of individual Bunsen flame on each of the perforated plate hole.  Perforated and secondary Bunsen flame both reached maximum SL similar with that of ethanol and higher than that of hexadecane. Slight increase of φ decreases drastically SL of perforated and secondary Bunsen flame. When the mixture was enriched, secondary Bunsen and perforated flame disappears, and then the flame becomes Bunsen flame with open tip and triple flame (φ = 0.62 to 1.07). Flame was getting stable until the mixture above the stoichiometry. Being isolated from ambient air, the SL of perforated flame, as well as secondary Bunsen flame, becomes equal with non-isolated flame. This shows the decreasing trend of laminar burning velocity while φ is increasing. When the mixture was enriched island (φ = 0.44 to 0.48) and petal (φ = 0.53 to 0.62) cellular flame take place. Flame becomes more unstable when the mixture was changed toward stoichiometry.
Premixed Combustion of Coconut Oil on Perforated Burner Wirawan, I.K.G.; Wardana, I.N.G.; Soenoko, Rudy; Wahyudi, Slamet
International Journal of Renewable Energy Development Vol 2, No 3 (2013): October 2013
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2.3.133-139

Abstract

Coconut oil premixed combustion behavior has been studied experimentally on perforated burner with equivalence ratio (φ) varied from very lean until very rich. The results showed that burning of glycerol needs large number of air so that the laminar burning velocity (SL) is the highest at very lean mixture and the flame is in the form of individual Bunsen flame on each of the perforated plate hole. As φ is increased the  SL decreases and the secondary Bunsen flame with open tip occurs from φ =0.54 at the downstream of perforated flame. The perforated flame disappears at φ = 0.66 while the secondary Bunsen flame still exist with SL increases following that of hexadecane flame trend and then extinct when the equivalence ratio reaches one or more. Surrounding ambient air intervention makes SL decreases, shifts lower flammability limit into richer mixture, and performs triple and cellular flames. The glycerol diffusion flame radiation burned fatty acids that perform cellular islands on perforated hole.  Without glycerol, laminar flame velocity becomes higher and more stable as perforated flame at higher φ. At rich mixture the Bunsen flame becomes unstable and performs petal cellular around the cone flame front. 
Faktor-Faktor Yang Mempengaruhi Persepsi Masyarakat Muslim Terhadap Zakat Sebagai Pengurang Pajak Wahyudi, Slamet; Saddam, Muhammad; Djaddang, Syahril
Jurnal Ilmiah Akuntansi Kesatuan Vol 9 No 1 (2021): JIAKES Edisi April 2021
Publisher : Institut Bisnis dan Informatika Kesatuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37641/jiakes.v9i1.499

Abstract

Tujuan dari penelitian ini adalah untuk mengeksplorasi faktor-faktor yang mempengaruhi persepsi masyarakat Muslim terhadap pengurangan pajak melalui zakat di Indonesia. Penelitian ini dilakukan terhadap wajib pajak yang terdaftar pada KPP Pratama Kota Depok, dengan mengambil sample secara langsung di lapangan, dengan penggunaan kuesioner sebagai alat pendataan. Penelitian ini menemukan bahwa aspek halal-haram dari Syariah Islam tidak memiliki pengaruh pada persepsi masyarakat Muslim terhadap sistem pengurangan penghasilan kena pajak melalui zakat. Selain itu, religiusitas tidak memiliki dampak positif yang signifikan terhadap persepsi masyarakat Muslim terhadap sistem ini. penelitian ini menawarkan temuan unik yang dapat membantu dalam memanfaatkan praktik di negara-negara Muslim dan untuk memahami persepsi masyarakat mereka mengenai sistem pengurangan pajak. Kata kunci: Persepsi, masyarakat Muslim, halal-haram, penghasilan kena pajak, religiusitas, zakat
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Madjid Achmad Noerkhaerin Putra Achmad Wibolo Aditya Wahyu Pratama Adrian Maidangkay Adriani Sunuddin Agung Sugeng Widodo Agus Indarto ahmad yani Al Manar, Primadika Ali Muntaha Andik Isdianto Andy Nugraha Anindito Purnowidodo Arifiana, Zahra Arimurti, Trias Aris Kurniawan Aulanni’am Aulanni’am Awaluddin Awaluddin Azamataufiq Budiprasojo Bambang Dwi Argo Bambang Semedi Bayanullah, Muhammad Bohra, Arunkumar Breliastiti, Ririn Budha Maryanti Budi, Arif Setyo Budiono Budiono Deandra, Muhammad Rizqi Denny Widhiyanuriyawan Denny Widyanuriyawan Dewi, Citra Satrya Utama Dharmanto, Asep Dhimas Nur Cahyadi Djaddang, Syahril Djoko Sutikno Dwi Irawan Eko Siswanto Ena Marlina Femiana Gapsari MF Fitriansyah, Erwin Fuad, Ainul Gatot Ciptadi Hagus Tarno Herandarudewi, Sekar Mira Hidayati, Nafisah Arina I.K.G. Wirawan I.N.G. Wardana I.N.G. Wardana ishak usman Jameelah, Mariyam Janitra Naufal Faza Kenoriza, Muhammad Ramadhan Krishna Tri Sanjaya Kusumo, Herma Nugroho rono adi Lilis Yuliati Lukman, Hendro Luqman Hakim Mahendra, Kiemas Aji Andika Marali, Aryati Muhaymin Mariki, I Wayan Wawan Marjono, Marjono Marundha, Amor Mochammad Junus Moh. Khusaini Muhamad Bula Muhammad Arif Muhammad Azmi, Muhammad Nafisah Arina Hidayati Noorsakti Wahyudi Nugraha, Arif Yunizar Nur Robbi Nurcahali, Fani Nuri Andarwulan Nurkholis Hamidi Nursaman, Dede Nurul Ichsan Pratikto Pratikto Pratikto, Pratikto Pribadi, Moch Fadlal Islamay Purnami Purnami Purnomo Budi Santoso Quraisya, Denas Rahmad Rahmad Randy Kuswanto Ratnasari , Vita Raviko, Johansyah Richard Pietersz Rizki, Septi Hasna Romels C. A. Lumintang Ronny Tuhumena Rosy Hutami Rudy Soenoko Rudy Soenoko Rudy Soenoko S Soemarno Sabaruddin Sabaruddin Saddam, Muhammad Sahri Muhammad Sapan, Yustina sapanli, kastana Septiani, Bunga Sonief, Ahmad As'ad SUBEKTI, FAJAR Sudarno Sudarno Sudjito Soeparman Sugiarto S Sugiono Sugiono Sukandar Sukandar Sulhendri Vega Fonsula Andromeda Wahyono Suprapto Wiadnya , Dewa Gede Raka Widya Wijayanti Winarto Winarto Yao, Jiafeng Yustian Bella Yuswono Hadi Zuhud, Ervizal A. M.