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INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Analisa Operasi Paralel Permanent Magnet Synchronous Generator Dalam Sistem Konversi Energi Angin Agusnadi Agusnadi; Amir Hamzah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The wind energy conversion system using Permanent Magnet Synchronous Generator (PMSG) has been used as a solution for applications that have low-speed initial drives such as wind turbines and micro-hydroturbines. This study aims to analyze the effect of operating a PMSG and parallel units in an isolated wind conversion system using a three-phase rectifier with diode type and boost converter with varying wind speed characteristics on wind turbines. The power capacity of the wind turbine generator is 500 Watt with an output voltage of 24 Vac and the battery energy storage system has a capacity of 50 Ah. The results of a simulation of the PMSG operating circuit in a wind energy conversion system for one unit, using a 50 ohm resistance at wind speeds of 10 m/s to 12 m/s produce a converter output voltage of 26.58 Vdc at a wind speed of 10 m / s , 39.45 Vdc at a wind speed of 11 m/s, and 52.84 Vdc at a wind speed of 12 m/s. In the operation of a wind energy conversion system for four units, each converter output voltage with a wind speed of 12 m/s is a 41.3 Vdc one turbine, 44.75 Vdc two turbines, 46.3 Vdc three turbines and four 37.57 turbines Vdc.Keywords : Renewable Energy, Wind Energy Conversion System, Permanent Magnet SynchronousGenerator, Boost Converter, Three-Phase Rectifier
Pengaruh Penambahan Limbah Ekstraksi Buah Kelapa Sawit Terhadap Pembuatan Beton Kasuma, Halim; Kurniawandy, Alex; Ermiyati, Ermiyati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The purpose of this research is to utilize the waste of palm oil with investigating the mechanical properties. The waste materials are the result of palm oil extraction. The experiment conducted to investigate the effect of this material over compressive strength, absorption, porosity, and setting time. The content of palm oil waste which added to normal concrete are varieties which are 0%, 2%, 4%, 6%, 8% and 10% of the weight of cement. The porosity test, absorption test and compressive test were performed at ages 7, 14 and 28 days for each test while curing with ordinary water. The results showed that the content of palm oil waste 2%, 4% and 6% decrease the compressive strength. Otherwise the addition of 8% and 10% increase the compressive strength. The absorption and porosity test value increase along with increase the content of palm oil using. The setting time with adding of palm oil waste is faster, rather than normal concrete. In conclusion, utilization of the waste of palm oil for concrete mixture can be done.Keyword: Concrete, Waste of Palm Oil, Extraction, Compressive strength, Porosity, Setting time
Deteksi Kebocoran Dan Sumbatan Pada Pipa Menggunakan Sinyal Suara Yahya, Tengku Hamzir Muhardillah; Huda, Feblil
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The pipeline system leads an important role and ubiquitous feature of modern society which is used as one of the high integrity fluid transport function, but has a major problem such as leakage and blockage. Detection methods are typically performed using ultrasonic pressure and wave differences at a relatively high price. The research method used is detection by using sound signal. Sound signal method is smart structural health monitoring that can detect problems quickly and precisely which has the advantage that is cheaper cost. Sound signals are given for leakage, blockage, and joint damage to water and waterless conditions of different sizes and positions. The sound signal data is processed by fast fourier transform and wavelet transform methods. From the test obtained the result increase amount of damage given the greater the amplitude generated with the largest estimation error in full blockage condition with water of 5%.Keywords : Sound signal, leakage, blockage, fast fourier transform, wavelet transform
Analisis Respons Struktur Portal Baja Bertingkat Akibat Kandungan Frekuensi Gempa Yang Berbeda Afisha, Elly; Suryanita, Reni; Yuniarto, Enno
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Indonesia is one of the countries that located in the quake zone. But not all earthquakes that occur is a devastating earthquake. Some earthquake parameters that affect the level of damage from a building structure are the peak ground acceleration, response spectrum value, earthquake duration, and earthquake frequency content. The earthquake frequency content parameters were considered the most influential on structural damage. The objective of this research is to get the response from the structure of multilevel steel portals such as displacement, inter-story drift, velocity, acceleration, and to analyze the displacement limit based on SNI 1729-2012. The reviewed structure is an open frame steel building model that is into 5 levels, 10 levels, and 15 levels. This study use time history analyses with 9 earthquake recordings of the Kobe earthquake, Mexico earthquake, Nepal earthquake, Chile earthquake, New Zealand earthquake, Sumatera earthquake, Fredericksburg earthquake, Mentawai earthquake, and Northridge earthquake that has been grouped into low-frequency content, medium frequency content, and high-frequency content. The results showed that the structure responses such as displacement, velocity, and acceleration will increase with the increasing number of levels of the building structure. The inter-story drift the allowed level of the structure still qualified based on SN 1729-2012 where the allowed drift in 7 cm and the inter-story drift produced by the structure is still less than 7 cm. An earthquake with low-frequency content has an enormous influence on the structure response in all the level structure.Keywords: response structure, time history, frequency content
Pengaruh Hambatan Samping Terhadap Kinerja Ruas Jalan Akibat Aktivitas Pasar Ikhlal, Khairul Al; Djuniati, Sri; Sebayang, Mardani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Traffic problems that often happens in Pekanbaru is congestion, which are population growth and vihicles are not supported with traffic and infrastructure developments. Factor that cause this congestions is effect of side barriers that can reduce capacity of the roads Side obstacle factors are: pedestrians, vehicle stop / parking on the road, vehicle exit / entry road and slow vehicle. The study was conducted in three market locations by taking direct data of field, for traffic volume, side barrier and vehicle speed then analyzed by using Manual of Capacity of Road Indonesia (MKJI) 1997.Research result showed that traffic volume of Tuanku Tambusai street in front of Cik Puan market on east is 3092 smp/hour with a capacity of 3871 smp/hour, degree of saturation 0.80 and on west, traffic volume is 3034 smp/hour, with a capacity of 3871 smp/hour, degree of saturation is 0.78. H.R Subrantas street in front of Pasar Pagi Panam on east is 2250 smp/hour, with a capacity of 2915 smp/hour, degree of saturation is 0.77 and on west, traffic volume is 2275 smp/hour, with a capacity of 2915 smp/hour, degree of saturation 0.78 and Durian street in front of Palapa market, the traffic volume is 1929 smp/hour, with a capacity of 2581 smp/hour, degree of saturation is 0.75. Based on the result of contribution analysis of side barrier at the three research sites, that the most effective way is doing by omitting the sides obstale factor of vehicle out into the side of the road and side obstale factor vehicle parking/stop at the road body and vehicles in and out in the side of the road.Keywords: Side Barriers, Volume, Capacity, Market activity, Degree of Saturation .
Optimasi Proses Pembuatan Arang Batang Sawit Melalui Proses Karbonisasi Menggunakan Response Surface Methodology Afriyenti, Mia; Helwani, Zuchra; Fatra, Warman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

Palm oil trunk until this date is a waste which still not been used maximally, so palm oil trunk have potential to be used as alternative energy resource of solid fuel with the way of increasing its calorific value through carbonization process. Carbonization is converting process of biomass to become charcoal at temperature range 300-600 oC in inert condition. The objective of this research is to study the characteristics of resulted solid fuels. Palm oil carbonization used tube furnace as reactor within operating conditions of temperature (350, 400 and 450 oC), residence time (90, 120 and 150 minutes) and feed size (2, 4 and 6 cm). The analized responses were calorific value and volatile matter content. Obtained result for calorific value amounts 24,426.300-28,929.100 kJ/kg and volatile matter content amounts 8-19 %. The obtained analysis is processed using Design Expert v7.0.0 Trial Version. Processing data begins with using first order to see the degree of curvature. Degree of curvature obtained indicate the model to use is second order. Level of significance between variables can be observed from the value of P-value < 0,05 and lack of fit > 0,05, which indicate that model is suitable with the obtained data. R2 obtained for Y1 = 0.9486 and Y2 = 0.9704. The most influential factors to all responses are carbonization temperature followed with residence time and feed size. At optimum operating conditions (temperature 449,99 °C during 149,96 minutes with feed size 2 cm), the value of optimum responses obtained are Y1= 28.282,2 kJ/kg and Y2 = 9,234 %.Keywords : biomass, carbonization, optimization, palm oil trunk, rsm, solid fuel
Studi Koordinasi Proteksi Arus Lebih Fasa Dan Gangguan Tanah Pada Jaringan Distribusi Berbasiskan Digsilent Powerfactory Putra, Randy; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Distribution Network is one of the parts in a power system that has an important role because it deals directly with users, especially the users of medium and low voltage level. Therefore it needs a protection system against abnormal condition to maintain the reliability of the system. The protective equipment analyzed in this article is the overcurrent relay (OCR) and ground fault relay (GFR). The aim of the article is to determine the settings of OCR and GFR protection devices. By calculating the short circuit, the current and time settings of OCR and GFR can be determined. The short circuit current was simulated by using DigSILENT PowerFactory. It has been found from the results that time setting is influenced by value of short circuit current. The higher the fault current the the faster the trip time of the protection devices. Keywords: Short Circuit, Protection, Relay Setting, DigSILENT
Analisis Ketersediaan Sistem Pembangkit Berbasiskan Pembangkit Listrik Tenaga Angin (PLTB) Dan Pembangkit Listrik Tenaga Surya (PLTS) Desrizal, Herki; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

The increasing need for energy and the depletion of petroleum reserves forces people to seek alternative energy sources. Based on the above problems it is necessary to analyse of the availability of generating systems to generate electrical energy pekanbaru city. This study uses a HOMER simulation consisting of Solar Cell (PV), Wind, and Converter. Simulation results of the highest availability of solar energy at 12.00 for 3.86 kw, and wind energy at 16.00 for 3.79 kw.for grouping of the potential winds are in group II that is locations with an average wind speed of 2,5 – 4 m/s. the resulting solar energy can be used for small scale electrical energy conversion system.Design of wind turbine (PLTB) and solar power plants the most optimal based on net present cost of $ 53.18 and cost of energy (COE) amount 506.$/kWh. In terms of its economy, the greater the installed renewable energy capacity, will decrease fuel usage levels and cost incurred.Keywords: PV, Wind, renewable energy, HOMER, Optimazation, Sensitivity, Availability
Analisis Energi Gas Engine Siklus Otto Kapasitas 835 KW Syaifudin, Ahmad; Romy, Romy; Martin, Awaludin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

Biogas from Palm Oil Mill Effluent (POME) is one of renewable energy resources that can be used to reduce theuse of fossil energy in satisfying the electricity needs. At biogas power plant, gas engine is an importantcomponent which functions to convert the energy contained biogas into mechanical energy to drive the electricgenerator. Because of its important function, the performance of the gas engine needs to be maintained in orderto remain well operated. In addition to maintaining the performance of gas engine, steps in improving theefficiency of gas engine energy usage also need to be done in order to become more efficient. Efficiency of thegas engine depends on the overall efficiency of cylinders gas engine in order to convert the energy of fuel intowork. Energy analysis is needed to know the efficiency of multi-cylinder gas engine at biogas power plant, so itcan be known the gas engine performance and can be used for further analysis in increasing the efficiency of theuse of renewable energy sources (biogas) in gas engine. The purpose of this research was to know the energy orthermal efficiency of gas engine. Variables used in the analysis were a composition of biogas, flow rate ofbiogas, a temperature of gas mixture entering the gas engine and temperature of exhaust gas. The energyanalysis result showed that the efficiency of all cylinders varies and the greatest energy or thermal efficiency ofgas engine is on 5th and 10th cylinder (56.29%) and lowest in 8th cylinder (56.17%). The average energy orthermal efficiency of gas engine is 56.23%.Keyword : Biogas, Biogas Power Plant, Gas Engine, Otto Cycle, Energy Analysis
Fenomena Hidrolis Pada Pintu Sorong Fahmiahsan, Rosyadah; Mudjiatko, Mudjiatko; Rinaldi, Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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The sluice gate is a hydraulic structure that used for controlling the discharge on dam or irrigation canal. Their discharge coefficient depends on geometric and hydraulic parameters. Swamee (1992) presents two formulas for calculating the discharge coefficient (Cd) for free flow and submerged flow based on Henry’s Curve (1950). Laboratory models used to find out the flow phenomenon that was formed due to a difference in the edge shape of the sluice gate and increased gate base. The simulation done by varying the height of the gate opening (a) and the discharge (Q). The results of the study obtained the length of water jumps (Lj) formed on the sluice gate with edge 450 is longer than the sluice gate with edge 900. The discharge coefficient (Cd) value on the sluice gate with edge 450 is higher than the discharge coefficient (Cd) value on the gate with edge 900. The energy loss trendline (ΔE) obtained shows the value of ΔE increases with increasing h2/h1. The value of the critical flow coefficient range (Ckr) on the sluice gate with edge 450 and 900 increases with the increase in base height. The results of this study also add to the long trendline of previous research that has been done by Klaas (2009).Keywords: Discharge Coefficient, Energy Loss, Hydraulic Jump, Sluice Gate

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