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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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Analisis Indeks Kekeringan Daerah Aliran Sungai Batang Anai Dengan Menggunakan Metode Standardized Precipitation Index Nurhasanah, Nurhasanah; Fauzi, Manyuk; Trimaijon, Trimaijon
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

There are several problems related to water resources such as floods and drought. One of the critical issue is drought. Drought is a nature phenomenon which is considered as common dangers which occurs in accordance of climate cycle related to hydrological cycle that affected by rainfall. Drought that affected only by rainfall is meteorological drought which is an early indication of drought. Based on the large impact, it is necessary to analyze index of dryness to find out the level of dryness as the early warning of further droughts. The location of the research was the Batang Anai watersheds which is one of water source of agricultural sector in Sumatera Barat Province. Standardized Precipitation Index (SPI) was one of the methods to analyze drought index in an area. The calculation was done based on rainfall data of half monthly period and monthly period from 1997 to 2016 on every rain station in DAS Batang Anai. The result of SPI drought index was correlated with Indian Ocean Dipole (IOD) phenomenon and then was mapped using ARC GIS software with tools Polygoon Thiessen. The final result of this research showed that in half period the highest value of drought index was -2,3811 (January, 1st periode, 2013) with extreme drought classification. While in monthly period, the value of drought index was -1,9183 (January, 2012) with very dry classification. This research also showed the suitability of SPI drought index with IOD drought phenomenon which has suitable average 70,14%.Keywords : Drought index, Standardized Precipitation Index, GIS, Indian Ocean Dipole
Perancangan Dan Pembuatan Alat Home Electricity Based Home Appliance Controller Berbasis Internet of Things Alfannizar, Ibnu; Rahayu, Yusnita
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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Currently the increasing of electricity bill become hot topic in Indonesia society. The increasing of electricity bills is due to the uncontrolled usage of home appliances. In addition, the uncontrolled usage of appliance will also cause a fire. One of the alternative solution to over come by deploying a remotely control system for home appliances. This paper purpose a home automation control system design prototyping. This design system is expected comply to Internet of Things (IoT) system. The system consists of hardware and software. The hardware consists of arduino and esp8266. The testing scenario is excuted as the following condition depend an internet for traffic and looping process of and vary of router distance. Conducted three tests based on the distance of the device to the router is specified as follow 30 cm, 5 m and 10 m, respectively. Based on the measurement result, the first test provides 1.93-4.20 seconds of data transmission time. The second test is 2.05-5.20 seconds and the third test is 4.74-8.51 seconds. These results are slightly higher than previous study with only 2-6 seconds. However, this system has ability to receive 100% data compared to other that is only 91.7%.Keyword :Internet of Things, Home Applianced Controller, Control System
Pengaruh Variasi Putaran Benda Kerja Dan Putaran Tool Menggunakan Metode Pemakanan Tangensial Pada Proses Turn-Milling Terhadap Kekasaran Permukaan Jefryanto, Gusmardani; Yohanes, Yohanes
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

The surface roughness of a machining process is a very important factor in the field of production that is one of the turn-milling process. Turn-milling is a combined machining process of turning and milling with complete tools (cutting) where workpieces and tools rotate together. The turn-milling process can generally be categorized in orthogonal turn-milling, tangential turn-milling and co-axial turn-milling methods. The resulting surface quality is also affected by the parameters of the machining process in the form of rotation of the workpiece and the rotation of the tool. The purpose of this research is to know the effect of parameters on surface roughness and optimal parameter to surface roughness by doing tangential process of turn-milling. By varying the parameter variables, the surface roughness generated in this study is influenced by the rotation of the workpiece and the rotation of the tool. The higher the tool rotation the lower the surface roughness. Conversely, the higher the rotation of the workpiece the higher the surface roughness. The optimal parameter is a rotation tool of 25000 rpm with a rotation of 630 rpm objects found in the roughness class N7 with a roughness value of 1.321 μm where the roughness value is lower among other N7 roughness classes.Keywords : Turn-milling, Tangential Turn-milling, Rotation, Roughness.
Deteksi Kerusakan Motor Induksi Dengan Menggunakan Sinyal Suara Anggriawan, Akbar; Huda, Feblil
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

Induction motor plays an important role in the industrial realm that serves as a driving parts such as the conveyor, lathes and others. Regarding to this important role, the early detection of induction motor damage becomes important for system operation, so that it could not stopped without scheduled. The types of damage that often occur in induction motor are mechanical unbalance, rotor damage and bearing damage. The usual detection method which uses vibration measurments has some disadvanteages such as it is very expensive, physical contact with the induction motor that occurs and the sensors are less heat resistant on induction motor. The author uses sound signal detection method that is cheaper regarding to the cost, it has no physiscal contact with the induction motor and heat resistant. The sound signal is generated by the exicitation of the artificial damage which is provided to the induction motor. Artificial damage is given by damaging the bearing, rotor and mass unbalance. Sound signal data from artificial damage test result on induction motor is processed by using fast fourier transform method. The result of the research obtains the amplitude increased number for one time motor rotation 2970 rpm (1xrpm) is 49.5 Hz, 144.5 Hz for bearing damage frequency and 78.5 Hz for the rotor damage frequency.Keywords : Induction motor, mechanical unbalance, bearing, rotor, signal sound, fast fourier transform
Balancing Rotor Dinamik Menggunakan Sinyal Suara Saputra, Ariadi; Huda, Feblil; Akbar, Musthafa
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Rotating machines that have been operating within a certain period of time there is frequent vibration. The vibration is usually caused by unbalance, misalignment, bearing defect, and others. Unbalance is ranked as a first cause of vibration, which more than 80% cases of vibration caused by unbalance. This condition causes the balancing process needs to be done. A commonly method of vibration measurement uses vibration sensors such as accelerometer or vibrometer, that should be affixed to the machine in operation. This can cause discomfort and may even dangerous the operator when measuring the machines. The solution of the problem can be done using non contact measurement, where the sensor is not attached directly to the test equipment. Microphone is a device that can record the sound signal without necessarily contact the tested device. The unbalance tendency of the test is characterized by the presence of the dominant frequency at one rotational speed (1 x rpm). From the test, the result of balancing of normal condition on one rotor and two rotors are 0.039 V and 0.031 V with balancing efficiency 87.88% and 80.74% respectively. The addition of unbalance mass on one rotor and two rotors is obtained balancing result of 0.031 V and 5.88x10-3 V with efficiency balancing of 93.58% and 97.43% respectively.Keywords : voice signal, unbalance, balancing, microphone, unbalance mass
Pengaruh Kondisi Proses Terhadap Kuat Tarik Pulp Pada Pembuatan Pulp Rumput Perimping Dengan Pelarut Organik Asam Formiat Susanto, Edi; Helwani, Zuchra; Zulfansyah, Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Perimping grass is one of lignocellulosic material which has not been fully utilized, so it is potential to be used as raw material for pulping which will provide economic value added. Organosolv pulping is the process of pulp making using organic solution. The objectives of this research is to study effect of the process conditions on tensile index. Effect of the process conditions were studied by Response Surface Methodology (RSM) with Central Composite Design (CCD). The experiment pulping is carried out at the boiling temperature of liquor at atmospheric pressure, with 40 grams of perimping grass using formic acid (concentrations of 60%, 70%, and 80%), reaction time (60 minutes, 120 minutes, and 180 minutes), liquid to solid ratio (10/1, 15/1 , And 20/1 b/b), with HCl catalyst 0.1% wt. The result pulp of the perimping grass for tensile index is 659.3-2.1149 N m/g. The variable interaction (concentration of formic acid and reaction time) is a significant factor to the pulp tensile index.Keywords: formic acid, organosolv pulping, perimping grass, RSM, tensile index
Variasi Heat Recovery Time Terhadap Unjuk Kerja Chiller Sistem Adsorpsi 2 BED Pada Temperatur Desorpsi 700C Sinaga, Tomi; Martin, Awaludin; Nasruddin, Nasruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Adsorption cooling system double bed with silica gel as adsorbent and water as the adsorbate is expected to reduce the use of refrigerant in the vapor compression system that utilizes refrigerant chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) that could potentially damage the ozone layer and increase global warming. This study aims to increase the value of the COP (Coeficient Of Performance) and SCP (Specific Cooling Power) adsorption cooling system double bed by testing. The method in this research is by means of heat and mass recovery time of the system. Methods of heat recovery time is done to improve the performance of adsorption double bed system-water pair silica gel as adsorbent-adsorbate. Based on test data and calculations are obtained, the lowest temperature of the water coming out of the evaporator is 12.57 0C with a change in average highest temperature was 2.440C. The highest COP value of the adsorption cooling system amounted to 0.49 in heat hecovery time 40 s and cycle time 500 s.Keywords: adsorption, heat recovery, cooling system, silica gel.
Bentuk Distribusi Hujan Jam - Jaman Kabupaten Kampar Berdasarkan Data Satelit Thessalonika, Thessalonika; Handayani, Yohanna Lilis; Fauzi, Manyuk
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Rainfall distribution is one of the parameters required for calculations of the design flood. The pattern of rainfall distribution is the mean of rainfall expressed in a graph that describe time function to variation in depth of rainfall. The pattern of rainfall distribution is obtained in two method, empirical method and averaging hourly rainfall data. The rainfall data used is obtained from TRMM JAXA in eight years (2009-2016) for Kampar Regency. In this research, the approach of distribution form between empirical methods with the hourly rainfall data average of TRMM to simplify the acquisition pattern of rainfall distribution. The empirical method used is Alternating Block Method (ABM), Modified Mononobe, and Tadashi Tanimoto. Based on TRMM rainfall data, that rainfall duration was dominated by one hours rainfall events. The analysis results for pattern of rainfall distribution approach of TRMM JAXA with empirical method shows that designed rainfall duration (3 to 8 hours) tends to approach Alternating Block Method (ABM) pattern.Keywords: Rainfall distribution, satellite rainfall data, Alternating Block Method, Modified Mononobe, Tadashi Tanimoto
Rancang Bangun Sistem Manajemen Power Supply Portable Pada Node Early Warning System Mitigasi Bencana Kebakaran Lahan Gambut Muammar, Taufiq; Amri, Rahyul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Early warning system is one of the technology to detect land fires by utilizing wireless sensor network. Continuously delivery of data by the sensor node causes a large energy consumption on the side of the node that can reduce battery life. This study was conducted to determine the battery durability in a long time during a fire and when there is no fire on peatland. The design of a portable power supply management system in the early warning system nodes is now used as a solution to get more energy efficiently and easy to operate. Power consumption savings on peatland fire detection systems using LM35 temperature sensor, Atmega8 microcontroller and HC-12 transmitter module. The results show that the best sleep mode feature on ATmega8 is in powerdown mode with a current of 0.287 mA. The range of distance that can be received by the transmitter module is 87 meters far without any obstacles. By using the time interval sleep / wake up scheduling at the time of data transmission able to minimize the large energy consumption and make long the active life of power supply with life time for 318 days..Keywords: ATmega8, Early Waring System, Power Supply, Sleep-wake up Scheduling.
Pengolahan Limbah Cair Sawit Dengan Metode Aop (Advanced Oxidation Process) Menggunakan Katalis LaMnO3 Perovskite Dengan Variasi Oksidan Peroxymonosulfate Hasrul, Hasrul; Saputra, Edy; Khairat, Khairat
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

Processing of palm oil into Crude Palm Oil (CPO) will produce a large amount of liquid waste. To produce a ton of crude palm oil (CPO) produced 6 m3 of palm oil mill effluent. In this study, a process for removing organic compounds in wastewater using the advanced oxidation process by combining peroxymonosulfate (2KHS5.KHSO4.K2SO4) and a catalyst of LaMnO3 Perovskite. The combination will produce sulfate free radicals that capable degrading harmful organic compounds in effluent effectively. Nanocrystalline LaMnO3 was obtained by calcination at a temperature of 800 °C for 2 hours with an average crystal diameter of the highest peak of 17 μm in the shape of the Rhombohedral catalyst and the catalyst has qualified the catalyst with a nanoparticle structure. Several variations of oxidation process variables were performed to assess their effect on organic matter decline. Some fixed variables were oxidation reaction temperature 30 oC, reaction time 120 min, stirring speed 400 rpm, and concentration of peroxymonosulfate solution 2 g/L and catalyst concentration 0,4 g / L. Conclution of this research is efficiency of 63.54 % for decreasing COD and efficiency by 27,4% for TOC reduction. This proved that the LaMnO3 catalyst is capable of activating peroxymonosulfate.Keywords : AOP, LaMnO3 Perovskite, Oxidation, Peroxymonosulfate

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