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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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Deteksi Kerusakan Dalam Bentuk Kebocoran Dan Sumbatan Elbow Pipa Menggunakan Sinyal Suara Dan Delapan Mikrofon Raynold Harlem Hutasoit; Feblil Huda
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

In this study, damage to the pipe was detected using a voice signal and eight microphones. The voice signal method is a smart structural health monitoring that can detect damage at a lower cost. Sound excitation is givenusing a loudspeaker and the response of the sound signal is sampled using eight microphones connected to a PC-Oscilloscope which functions to convert the analog signal from the recorded sound into a digital signal inthe form of a time domain value and then uses a Continuous Wavelet Transform (CWT) to determine the location of the damage. occurs in the pipe sheath. To detect the location of pipe damage in various damage positions, itcan be searched by comparing the wavelet coefficient and seen on the polar plot of eight microphones. The damage given is in the form of plugs and leaks with different distances and positions. From the experimentalresults obtained for a single pipe with leaking conditions on leaking pipe testing 0.7 m in the direction of 210º it can be seen that the highest wavelet coefficient value occurs at microphone 6 and microphone 5 which is0.01374 and 0.01274 according to the location of the damage that occurred in the an angle of 210º between 180º and 225º. It can be seen the location of the damage position in the pipe casing through the polar plot, the pointthat is further away from the outer circle on the 6-way microphone 225º and the 5-way microphone 180º is the position of the location damage pipe.Keywords : Sound Signal, Leakage, Blockage, Fast Fourier Transform, Wavelet Transform, Polar Plot.
Analisis Pengaruh Ketidakseimbangan Beban Terhadap Efisiensi Transformator Distribusi Jeri Arnando; Amir Hamzah; Feranita Feranita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The increasing user of electrical energy so PT PLN (Persero) is required to design a balanced distribution of electric power in each phase, in order to meet the needs of efficient electricity. However, there is often a load imbalance in the distribution of electric power. This study analyzes the effect of load imbalance on distribution transformer efficiency by using the calculation method of percentage loading, load imbalance, losses and efficiency of the transformer. From the results of the study it was found that the lowest efficiency occurs when the load imbalance is high. So that in this condition the neutral wire will have a current and cause losses where the value is proportional to the value of the neutral current. These energy losses will lead to lower transformer efficiency. From the results of research that has been carried out on the distribution transformer of PLN (Persero) ST 009 on October 29, 2021 with data obtained at 21.00, the load imbalance is 10.88% with a neutral current of 96 A and at 22.00, the load imbalance- it is 7.2% and the neutral current is worth 74 A. So the losses that occur at 21.00 are greater than at 22.00 which results in efficiency at 21.00 being smaller than at 22.00 with efficiency values of 94.41% each. compared to 95.04%. Keywords: Load Unbalance, Loss, Transformer Efficiency.
Kualitas Jaringan Wireless Di Cafe Pekanbaru Elfrida Nova Sartika; Rahyul Amri; Noveri Lysbetti Marpaung
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Wireless network is a wireless network that uses air as a transmission medium with a medium in the form of electromagnetic waves. Cafe is a place to relax and talk for all ages (young people and parents) in addition to providing a comfortable place this café also provides wifi network that can be accessed by all café visitors who come. In the café that is an obstacle at this time is the internet connection available is unstable, resulting in visitors who are just logging into the wifi network experiencing difficulties and often long buffering. This is because there is no bandwdith division (bandwidth management) so that usage between users is uneven. To find out the quality of the existing network in the café, measurement of network quality uses Quality of Services (QoS) parameters. QoS is a method of measuring how good the quality of service of an existing network, the parameters used are the packet loss of three users during five days of testing. From the test results, the results of the qualification are obtained according to TIPHON standards, on the value of the first user packet loss to the third user with the highest value, namely on the third user on the third day by 4.02% in the good category and for the lowest value of 2.67% on the second user on the first day in the category is very good. For the average value of the highest packet loss value of 3.43% obtained on the second day with the third index in the Category Bagus, while the lowest packet loss average value of 3.09% is obtained on the first day with the third index included in the Category Good based on the TIPHON standard.Keyword: Wireless, Parameter QoS, Packet loss, TIPHON Standard.
Analisis Jalan Pahat dan Biaya Produksi Disc Brake Sepeda Motor Menggunakan Metode Taguchi dan Softwate Mastercam Muhammad Ikhlas; Anita Susilawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Tool path generation is very important to optimal time and cost of the production process of product. This research purpose is to analyze tool path generation and production cost of disc brake for roughing and finishing work on die casting product. This research was used the Taguchi method and simulation using by Software Mastercam 2020 (CNC Milling). The simulation result was obtained the estimates time for each variable that was tested. Then it can be analyzed the cost of production to obtaining the efficient tool path in the manufacturing of disc brake. This research was resulted a dynamic tool path in facing with face mill’s tool for roughing process with a spindle speed of 2,825 rpm, the feed rate of 2,373 mm/minute, and depth of cut of 0.18 mm. The contour for roughing process with a spindle speed was 10,743 rpm, the feed rate of 4,673 mm/minute, and depth of cut 0.8 mm. Then the finishing process for facing with end mills’s tool produces a dynamic toolpath with a spindle speed of 11,937 rpm, the feed rate of 8,595 mm/minute, and depth of cut of 0.05 mm. The finishing process for drilling produces a chip break toolpath with a spindle speed was 6,565 rpm and feed rate of 788 mm/minute. Finally the contour for finishing process with a spindle speed was 11,937 rpm, feed rate of 8,595 mm/minute, and depth of cut of 0.25 mm. Therefore, the final simulation was produced 7.2975 minutes for time of production, so the total of production cost was Rp 74,056/product. Keywords : Disc brake, CNC milling, taguchi method, mastercam, cost production
Disain Alat Utama Menara Distilasi De-Ethanizer Pada Prarancangan Pabrik Benzene, Toluene, Dan Xylene (BTX) Menggunakan Proses Cyclar BP/UOP Muh. Fadlan Alfuadi; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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Abstract

Benzene, toluene and xylene (BTX) are petrochemical products made from naphtha through a catalytic formation process. Benzene and toluene are some of the products that are widely used in chemical raw materials. One of them is toluene, Toluene is used as a solvent and intermediate in the manufacture of chemicals, high octane components and gasoline, while the need for pxylene is increasing. With the increasing demand for polyester fibers and films. The designed factory production capacity is 602,606 tons per year. One of the main separation tools in this plant is the De-ethanizer. This distillation is designed to separate hydrogen gas, methane, and ethane from the naphtha mixture. De-Ethanizer has operating conditions with a feed temperature of 289 Kelvin, a distillate temperature of 216 Kelvin and a bottom temperature of 306 Kelvin and a pressure of 7,01 bar. The de-etanizer feed flow rate is 147229,0473 lb/hour with the gas phase in the form of a mixture of hydrogen, methane, ethane, and naphtha. The distillate flow rate is 10763,0445 lb/hour with the gas phase in the form of a mixture of hydrogen, methane, and ethane and the bottom flow rate is 136491,2049 lb/hour with the liquid phase in the form of naphtha. The shell material used is SA-285 grade C stainless steel. De-Ethanizer distillation is designed with a height of 9,64 meters, a shell thickness of 1 in and has 20 plates with a sieve tray type. Keyboard: BTX, De-Ethanizer, catalityc reforming, sieve tray
Uji Emisi Gas CO Dari Pembakaran Briket Tandan Kosong Sawit (TkS) Pada Skala Rumah Tangga Wanda Putri Saragi; Hafidawati Hafidawati; Elvi Yenie
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Biomass is an alternative energy source because it has hydrocarbon molecules. In this study, processing of biomass into briquettes from plantation waste is carried out in the form of Oil Palm Empty Bunches (TKS). In its use, briquettes through the combustion process will produce carbon monoxide gas emissions which have many negative impacts. Therefore, this study was conducted to determine the results of CO concentration resulting from the combustion of EFB briquettes on variations in emission measurement distances. Emission testing was carried out using the Environmental Combustion Analyzer Model 450. The results of the analysis obtained the concentration of CO parameters for EFB briquettes with variations in the measurement distances of 0 cm, 10 cm, 20 cm and 30 cm, namely 162 mg/Nm3, 141 mg/Nm3, and 74 mg. /Nm3 and 69 mg/Nm3. The test results for a safe distance that can be used for cooking is at a distance of 30 cm from the emission source, namely the emission test results are below the quality standard of 69 mg/Nm3 Keywords: biomass, briquette, emissions measurement distance, empty bunch of palm, carbon monoxide
Kuat Tekan Beton Blended Abu Terbang Dengan Tambahan Serat Nanas Mohd. Rizki Novianto; Monita Olivia; Gunawan Wibisono
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Blended fly ash concrete is concrete with partial cement substitution using pozzolan in the form of fly ash. This study examines the effect of adding pineapple fiber by 0%, 0.3%, and 0.6% of the concrete volume to the compression strength of blended fly ash concrete. Fly ash substitution in the concrete mixture was 10%. There were nine cylinder samples with size of 105 x 210 mm. Test were carried out after 28 days of immersed curing. All the pineapple fiber blended fly ash concretes have an increase in compressive strength at the age of 28 days. The maximum compressive strength was obtained on the blended fly ash concrete after adding pineapple fiber by 0.3%, with compressive strength value by 23.30 MPa., it was higher 27.042% than the 0% variation concrete (control). Based on all the test results, it can be concluded that the addition of pineapple fiber and the use of fly ash as a cement substitute in concrete has a positive impact on the compression strength of the concrete. Keywords: blended fly ash, fly ash, Portland cement, pineapple fiber, fiber concrete
Studi Kasus Audit Energi Dan Peluang Penghematan Energi Pada Plant Pulp Dryer 3 PT. Riau Andalan Pulp And Paper Wahyu Syahputra; Zulfansyah Zulfansyah; Hari Rionaldo; Sri Wahdini Rahmi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Energy auditing is one of the steps made in an effort to realize energy saving programs. The energy widely used in the pulp and paper industries is thermal energy (steam). Pulp drying is one of the processes that many use such energy. The thermal energy used was of low to moderate pressurized steam, which was supplied into a number of rotating dryer cylinders. Evaporation is done because water can no longer be removed from the fiber by gravity and vacuum in the forming of the unit and mechanically in the pressing of the unit. The results of the study were found two “steam trap” units with “inverted” installation positions and four “steam trap” units as well as six “valve” units with “Passing" (leaking)” conditions that made “losses steam” of 467.8 Kg/hr or 1,467 tons of steam/year or about IDR 240.051,840 in a year. The inverse improvements/recovery of “steam trap” positions can save steam with a saving percentage of 0,34% of total steam costs per year and will return investment capital for four hours. Whereas the turnover on leaked “steam trap” units could save steam of 2,574 tons of steam/year with a savings percentage of 0.60% of total steam cost per year and would return investment capital for four months.Keywords : Pulp Dryer, Energy Consumption, Energy Saving, Steam Trap, Losses Steam
Kuat Tekan Dan Porositas Beton Geopolimer Hybrid Faba Dengan Penambahan Semen PCC Di Air Gambut Ikrammullah, Muhammad; Olivia, Monita; Wibisono, Gunawan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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Abstract

Geopolymer hybrid concrete is formed from materials containing alumina and activated silica using an alkali activator with the addition of portland cement to produce heat of hydration, so as geopolymer concrete treatment can be carried out at room temperature. The purpose of this research to knowing durability of geopolymer hybrid FABA concrete with the addition of PCC after exposed to peat water for 0, 7, and 28 days. Control concrete with a design quality of 20 MPa. The activator solution used NaOH with molarty 12M and Na2SiO3 with a modulus ratio (Ms) of 2.5. The percentage added of PCC cement is 15% by weight of FABA. Results of the test showed that the compressive strength of PCC concrete increased 8.82%, while geopolymer hybrid concrete increased 6.88% until the age of 28 days cured in peat water. Moreover, the porosity of PCC concrete of PCC concrete decreased 3.01%, while geopolymer hybrid an increase 6.08% until the age of 28 days cured in peat water.Keyword: peat water, geopolymer hybrid, concrete, compressive strength, porosity, fly ash and bottom ash.
Pengenalan Suara Untuk Penggerak Robot Lengan Dengan Metode LPC Dan ANN Menggunakan Perangkat Raspberry Pi 3 Rohman, Fathur; Candra, Feri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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Abstract

At this time, technological developments have progressed so rapidly, one of which is in robotics with speech recognition as a robot mover. The use of speech recognition for interactively controlled robotic propulsion can replace the robot control system which is still manual. For this reason, the design and manufacture of a robotic arm movement system with the introduction of voice as a control. This study designed a system so that the robotic arm can be moved based on the voice commands intended for use handicapped (no hands) that utilizes voice signal extraction techniques by taking the pattern of voice commands generated by LPC and ANN methods. Based on the design results, controlling the robotic arm with voice recognition can be well detected. LPC method is used as feature extraction for speech recognition, while ANN with backpropagation algorithm is used for decision making from the resulting sound pattern. This study was tested with ten samples for each of the four speech recognition given. The study results show that the system can recognize the given sounds with an accuracy of 90% with a total of 40 test words from 4 types of words, namely right, left, clamp and release.Keyword: Voice Recognition, Arm Robot, Linear Predictive Coding, Artificial Neural Network.

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