Jurnal Rekayasa Elektrika
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Pengembangan Antena Bowtie 2,1 GHz Terintegrasi Artificial Magnetic Conductor (AMC) untuk Aplikasi Antena Transmitter pada Sistem Ground Penetrating Radar (GPR)
Get PDFThis study presented the development of the bowtie antenna system design as the transmitter in the Ground Penetrating Radar (GPR) system. The Artificial Magnetic Conductor (AMC) reflector was integrated into the antenna system as a ground plane to obtain a high gain, increase bandwidth and produce a low-profile antenna. The antenna is designed to work at a center frequency of 2.1 GHz with a range of 1.6 - 2.6 GHz and has ultrawideband (UWB) characteristics with a fractional bandwidth of 25%. In addition, the value of late-time ringing must also be reduced to -30 dB to prevent masking effects on the detected object. Antenna modeling and simulation was done to obtain the optimum prototype design. Bowtie antenna realization was carried out using RT Duroid 5880 as a substrate with dielectric constant (r) = 2.2 and thickness (h) = 1.57 mm. The AMC reflector was fabricated with FR-4 Epoxy substrate with a dielectric constant (r) = 4.4 and thickness (h) = 1.6 mm. The antenna realization results show that the antenna has bandwidth = 510 MHz, return loss = -15.17 dB and VSWR = 1.15. The AMC integrated bowtie antenna radiation pattern produces a unidirectional pattern with gain = 4.2 dB. However, the ringing level becomes high by -19.18 dB. Further development is needed to achieve ringing level values that meet the GPR antenna system specifications
Pemetaan Endapan Mineral Teralterasi Hidrotermal Menggunakan Analisis Citra Landsat 8 di Sekitar Gunung Api Bur Ni Geureudong, Kabupaten Bener Meriah, Aceh
Get PDFVegetation area and altered mineral by hydrothermal mapping using Landsat 8 satellite data has been done at Bur Ni Geurudong Volcano, Bener Meriah Regency, Aceh Province. Bands 5 and 4 data were used for Normalized Different Vegetation Index (NDVI) transformation technique. Band composition ratio of 6/5 and 6/7 were used for band ratio technique to interprete ferric oxide and clay minerals. The results show moderate (0.2-0.5) distribution of vegetation density found at Wih Pesam and Pante Raya Barat. The high density (0.50-0.88) vegetation areas are found at Silih Nara and Pinto Rime Gayo. The maximum distribution (1.98-2.23) of ferric oxide minerals found at Bur Ni Telong and few at Pinto Rime Gayo with sulfur content manifestation. This mineral is also founded on Silinara manifestation area. Maximum (2.33-8.88) distribution of clay mineral was found at Bur Ni Geureudong Volcano, few seen at Bur Ni Telong area. Based on the results, the Landsat 8 satellite imagery is effectively used for mapping of ferric oxide and clay minerals. Mapping of ferric oxide and clay minerals rovide information about the types of minerals that exist in Bur Ni Geurudong Volcano as a preliminary information about the types of geothermal reservoir rocks in the region
Desain dan Implementasi Antena Quadrifilar Helix untuk Komunikasi Antarpulau pada Pita UHF
Get PDFRiau Islands, which consists of thousands of islands and is located in the border area of Indonesia, has its own challenges. Based on this strategic geographical location, there are threats and opportunities to develop inter-island information systems. Wireless long-range communication is considered the most suitable for these conditions. Antennas are an important part of wireless communication. Research and fabrication of the Helix Quadrifilar antenna by utilizing the advantages and consideration of simple, lightweight and inexpensive materials, as the receiver antenna in inter-island communication systems. In this research, the design was carried out with the assist of the Antenna Magus software, measurements were using a Vector Network Analyzer instrument, and testing accomplished under the LOS conditions. The results are fabricated antenna optimum frequency shift of 433 MHz to 452.5 MHz, within 5.88% error percentage. The antenna fabrication, which is measured at a frequency of 433 MHz, obtained return loss -13.06 dB and VSWR 1.5, that meets the criteria of 1 VSWR 2. Quadrifilar Helix Antenna fabricated results can receive data from GPS sensors, temperature, humidity, air pressure, wind speed and wind direction of up to 9 kilometers. So that this antenna is suitable to be used as an antenna for inter-island UHF communication
Rancang-Bangun Prototipe Sistem Kontrol Berbasis Programmable Logic Controller untuk Pengoperasian Miniatur Penyortiran Material
Get PDFA miniature sorting of material quality has been made, aided by a prototype of the controller system based on the Mitsubishi FX1N-24MR Programmable Logic Controller (PLC). A number of stages include the manufacture of the conveyor system unit, the electrical system, PLC programming, and performance measurement. The conveyor unit assembling was processed by installing the conveyor belt, dc motor, pneumatic cylinder, solenoid valve, and sensors. The electrical system is an integration of the Mitsubishi FX1N-24MR PLC, switched-mode power supply, miniature circuit breaker (MCB), dc voltage regulator circuit, relays, digital counters, pushbuttons, and selector switches arranged in a 20 x 30 x 15 cm panel box. Mitsubishi PLC system programming is based on algorithmic determination and ladder diagram arrangement assisted by GX Developer (GX Work). Performance measurement in the form of pulse readings is carried out by setting and manufacturing ladder counters and shift registers to count the number of pulses for each material and the accuracy of sorting when the material is detected simultaneously. The system performance is indicated by pulse reading accuracy and sorting timing accuracy. The reading of the pulse from the proximity switch affects the counter calculation to activate the pneumatic cylinder unit in sorting. Sorting for material-A takes 11 pulses, while for material-B, it takes 19 pulses. The synchronization measurement functions when an error occurs in the system in order to maintain the input received is the same as the output in the PLC-based control system
Implementasi Fuzzy Logic Untuk Identifikasi Jenis Gangguan Tegangan Secara Realtime
Get PDFIn the modern era, AC voltage variations are still often a problem. This variation causes power quality decrease even damage the equipment. Voltage variations that often occur are short and long duration. The variation consist of 6 types namely Interruption, Sag, Swell, Sustained-Interruption, Undervoltage, Overvoltage. To facilitate repairs when there is a voltage variation in the electric power system, it is necessary to have an identification that can detect and distinguish any interference that occurs. Therefore, this paper proposes a fuzzy logic method for identifying types of voltage variations. This type of voltage variation identifier requires a disturbance simulator as a voltage source with varying values. To distinguish between short duration and long duration disturbances, is the time duration of the disturbance appears. The design of the voltage variation identification algorithm uses the sugeno fuzzy inference system with 2 inputs namely magnitude vrms and timer, and 1 output is the type of voltage interference. Moreover, prototype design using AMC1200 voltage sensor, microcontroller, and display. To validate the proposed algorithm, compared with standard measuring tools and simulations. Results show that the proposed algorithm has a very good performance with an accuration compared to the standard measuring instrument of 99.8%
Vol. 16, No. 2, Agustus 2020
No full textPenerbitJurusan Teknik Elektro dan KomputerFakultas Teknik Universitas Syiah KualaAlamat RedaksiJurusan Teknik Elektro dan KomputerFakultas Teknik Universitas Syiah KualaJl. Tgk. Syech Abdurrauf No. 7, Banda Aceh 23111Telp/Fax: 0651-7554336e-mail: [email protected]: http://jurnal.unsyiah.ac.id/JR
Penerapan Neural Network untuk Klasifkasi Kerusakan Mutu Tomat
Get PDFThe decrease in quality and productivity of tomatoes is caused by high rainfall, bad weather andcultivation so that the tomatoes become rotten, cracked, and spotting occurs. The government is trying to providetraining to improve the quality of tomatoes for farmers. However, the training was not effective so the researchershelped create a system that was able to educate farmers in the classification of damage to tomato quality. This systemserves to facilitate farmers in recognizing tomato damage thereby reducing the risk of crop failure. In this study,the classification method used is backpropagation with 7 input parameters. The input consists of morphological andtexture features. The output of this classification system consists of 3 classes are blossom end rot, fruit cracking andfruit spots caused by bacterial specks. The best accuracy level of the system in classifying tomato quality damage inthe training process is 89.04% and testing is 81.11%
Evaluation Of Inverse Kinematics For Quadruped Robot With Accelerometer Sensor
No full textQuadruped robot is one of the types of robots that move using legs 4 compiled by some of the servo motoras a driving force on each foot ft the DOF is used. However, problems arise when this robot is confronted on theinclined plane, because the burden is borne out every servo motor on the feet will be different, so can make a fastservo motor damaged. This research was conducted on the design of the quadruped robot system for stability on theinclined plane using the accelerometer sensor and the application of the inverse kinematics method with PID controlof Ziegler-Nichols. The results of tests obtained response robots in stabilizing the body when faced with the inclinedplane with some degree of slope of the pitch and roll. In this research was conducted some test for quadruped robot:static Testing robot against the angel of the pitch in the standby retrieved response average robot in stabilizing thebody is 245 ms, static Testing robot against the angle of roll in standby retrieved response average robot in stabilizingthe body is 280 ms, dynamic Testing robot against the roll and pitch in standby retrieved response average robot instabilizing the body is 8 seconds, Static Testing robot to stabilizing the body against the angel of roll in running thelargest robot oscillations obtained 10 degrees, dynamic Testing robot to stabilizing the body against the angle of rollin run retrieved response average robot in stabilizing the body is 490 ms.Quadruped robot is one of the types of robots that move using legs 4 compiled by some of the servo motor as a driving force on each foot fit the DOF is used. However, problems arise when this robot is confronted on the inclined plane, because the burden is borne out every servo motor on the feet will be different, so can make a fast servo motor damaged. This research was conducted on the design of the quadruped robot system for stability on the inclined plane using the accelerometer sensor and the application of inverse kinematics method with PID control of Ziegler-Nichols. The results of tests obtained response robot in stabilizing the body when faced with the inclined plane with some degree of slope of the pitch and roll. In this research was conducted some test for quadruped robot: static Testing robot against the angel of the pitch in the standby retrieved response average robot in stabilizing the body is 245 ms, static Testing robot against the angle of roll in standby retrieved response average robot in stabilizing the body is 280 ms, dynamic Testing robot against the roll and pitch in standby retrieved response average robot in stabilizing the body is 8 seconds, Static Testing robot to stabilizing the body against the angel of roll in running the largest robot oscillations obtained 10 degrees, dynamic Testing robot to stabilizing the body against the angle of roll in run retrieved response average robot in stabilizing the body is 490 ms
Rancang Bangun Alat Ukur Ankle Brachial Indeks Untuk Deteksi Peripheral Artery Disease
Get PDFAbstractABI measurements are performed to detect PAD. ABI measurements are essential because, generally,patients are not aware of having PAD due to no significant signs and symptoms. Type 2 Diabetes Mellitus Patientstend to have PAD, which increases the risk of cardiovascular and mortality. Therefore, the measurement of ABIregularly is needed to prevent PAD. Early detection and regular monitoring of PAD by measuring ABI can avoidfoot complications, such as injuries, gangrene, and amputation. The standard method to measure ABI is usingDoppler. Unfortunately, not all health care providers have Doppler because it is an expensive instrument andrelatively difficult to use. The purpose of this study is to design a simple and easy Prototype to measure ABI by usingpressure sensors. Two pressure sensors measure the systole of blood pressure in the arm and leg to get the ABI. Thisstudys sample is 20 people consisting of 10 healthy people and ten diabetes mellitus patients. The result shows theABI prototype has an error of 0.53% with an accuracy rate of 99.47%. It is indicated that the ABI prototype can beused for diagnosing PAD
Sistem Pendaratan Otomatis pada Quadcopter menggunakan Sliding Mode Controller
Get PDFA quadcopter has a very nonlinear system characteristic that is inuenced by unexpected disturbancessuch as the inuence of wind that reected off the ground when taking off or landing. Therefore, a robust controlstrategy is needed to improve the quadcopter performance. In this study, the control strategy is used to resolveoutdoor automatic landing problems in a stable manner using the Sliding Mode Control (SMC) algorithm. Thequadcopter has six degrees of freedom (6-DoF) with only four independent inputs, this makes it impossible to control6-DoF directly and simultaneously. To handle this, the proposed structure is a multilevel control structure, innerloop dan outer loop controller. The Inner loop controls the rotational dynamics subsystem (3-DoF), while the outerloop controls the translational dynamics subsystem (3-DoF) which is designed in conjunction with the generation ofattitude angle set-point. With the concept of automatics landing can reduce the risk of accidents on a quadcopter.The SMC technique on an automatics quadcopter landing shows the results with an error in roll of 0.05 radians,pitch 0.03 radians, yaw less than 0.3 radians, and translational movements the z-axis is 0.2 meters