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IPTEK Journal of Engineering
ISSN : -     EISSN : 23378557     DOI : -
IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. Published actually in April, August, and December. It is open to all scientist, researchers, education practitioners, and other scholars. Therefore this journal welcomes various topics that have received by Professors and Doctors specifying related studies, and they come from reputable universities all over Indonesia and universities abroad.
Articles 34 Documents
Implementation of Genetic Algorithm for Parameter Tuning of PID Controller in Three Phase Induction Motor Speed Control Happyanto, Dedid Cahya; Wijayanto, Ardik
IPTEK Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (432.525 KB) | DOI: 10.12962/joe.v1i1.442

Abstract

Induction motor at low speeds has a tough speed setting sets the width of the range. This study tested by giving the load motor disorders to describe the condition. The method used for vector control system so that the resulting performance is good at setting the motor speed and torque. This method is used in setting the Proportional Integral Derivative (PID) Tuning parameter settings based on Genetic Algorithm (GA) to provide a dynamic response to changes in speed and load torque on the motor, so we get smoothness at any speed change and braking and maximum torque motors. Optimization function is required to obtain a new PID parameter values each input value changes or load disturbances, in terms of the initial determination of these parameters using Ziegler-Nichols method based on frequency response. Tests were performed at a speed of approximately 1800 rpm value rise time of about 10 seconds after generation added, at a rate of 1800 rpm rise time value of the average remains around 9 seconds, but slightly reduced the oscillations in the response, and the speed of approximately 1700 rpm rise time value of the average is 9 seconds. The test results show that GA-based PID controller has a good response in approximately 0.85% overshoot at the motor speed change and braking
Prediction of Gas-Liquid Equilibria of CO2-K2CO3-MDEA-H2O System by Electrolyte UNIQUAC Model altway, saidah; Kuswandi, Kuswandi; Altway, Ali
IPTEK Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (227.498 KB) | DOI: 10.12962/joe.v1i1.437

Abstract

Carbon dioxide is an acid gas that can be harmful impurity especially in the chemical industry. Various processes have been developed to reduce the CO2 from the gas stream. Chemical absorption is the most economical method for CO2 separation. One of the processes that is widely used in industries is Benfield process with K2CO3 (potassium carbonate) as a solvent and amine as a promotor. In this study, MDEA (Methyldiethanolamine) is used as a promotor. As a reference for designing CO2 absorption/stripping packed column in industries, gas-liquid equilibrium data were required. The objective of this study is to predict the gas-liquid equilibria of CO2-K2CO3-MDEA-H2O system at 30oC and atmospheric pressure with 30% K2CO3 and variation of weight percent of MDEA 2, 5, 8, and 10%. The model used in this study is an electrolyte UNIQUAC. The simulation was conducted using Matlab programming. The deviation of predicted CO2 partial pressure with the experimental data is 14.85%. The energy interaction parameters of electrolyte UNIQUAC model were obtained from fitting with the experimental data by Least Square method. The results of this study represented that with increasing CO2 partial pressure, CO2 loading increased, and also at the same partial pressure of CO2, CO2 loading increased with the increase of weight percent of MDEA
Opinion Extraction of Public Figure Based on Sentiment Analysis from Twitter Hayatin, Nur; Mentari, Mustika; Izzah, Abidatul
IPTEK Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (246.051 KB) | DOI: 10.12962/joe.v1i1.434

Abstract

Twitter is a microblog that can generate an information from users such as sentiment about public figures. Sentiment analysis of public figure interpret the positive or negative response. This study aims to create system that automatically can extract the opinion about public figure based on sentiment analysis in twitter using two novel features, they are specific term and number of followers public figures lover and hater. Several step to determine the sentiment of public figure are preprocessing, weighting, classifying, and determining sentiment response. In this paper we use six public figures to be observed. This research resulting precision 99%, recall 75%, and accuracy 76,67%.
Auto Berthing – a Solution for Achieving Zero Waiting Time at Harbour Aisjah, Aulia Siti; Masroeri, A A; Sulisetiyono, Aries; Gunawan, Randika
IPTEK Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (232.201 KB) | DOI: 10.12962/joe.v1i1.477

Abstract

Tanjung Perak Port is one of biggest harbour in Indonesia. The shipping start from Karang Jamuang to Naval Base. The moving is use help of scout ships and tug boat.  A control system can be applied to anchored ships , to replace the role of tug and scout boat. Movement from the parking position to the anchored involve auto maneuver and auto berthing. Both auto system is designed using fuzzy logic control. Input of control from sensors and guidance according to the path leading to the dock, and to anticipate the environmental disturbance factors (that is ocean currents). Control rules are unique, according to the type and size of vessel. In the case study to AHTS vessels, berthing auto show good ability. The heading error of 0.04° to the direction parallel to the dock, and the range of distances error is 0.16 to 2.16 meters from the desired position. Reduction of processing time leaning point to Jamrud dock is 33 minutes.
Tin Extraction from Slags Used Hydrochloric Acid Soewarno, Nonot; Altway, Ali; Susianto, Susianto; Taufany, Fadlilatul; Nurkamidah, Siti
IPTEK Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (194.87 KB) | DOI: 10.12962/joe.v1i1.438

Abstract

Slag is a mixture of mineral in tin sand or by product in the smelting process. By using separation process, tin can be separated from other minerals in slag. Extraction process with a solvent is usually used to separate tin from other minerals. Furthermore, solution that still contains many dissolved compounds is adsorbed by activated carbon and desorption back with NaOH solution. This study only focuses on the extraction process to obtain a stannate chloride solution with extraction temperature, solvent concentration, extraction time, and liquid/solid ratio as variables. Hydrochloric acid (HCl) has been used as solvent in this study. The concentration of tin in the extracts of each variable was analyzed to determine the percentage of recovery of tin and the optimum operating conditions in the recovery process of tin from waste slag. Experiment results show that the percentage of recovery increases with the increasing of extraction temperature and solvent concentration The highest recovery is 61.5% which is obtained when the extraction temperature is 80 ºC, concentration of HCl is 10 wt%, with a HCl solution and slag ratio is 7: 1 and extraction time is about 30 minutes.
The Comparisson between LBP and SQI Methods in the Surface Roughness Measurement Using ESPI Method Effendi, Mohammad Khoirul; Pramono, Agus Sigit; Pratama, Pandu; Wardana, Rifki
IPTEK Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (904.303 KB) | DOI: 10.12962/joe.v2i1.470

Abstract

Surface roughness measurement using direct contact methods raises several issues, for examples stylus wear and size limitation problems. Furthermore non-contact methods are proposed to solve these problems. One of them is Electronic Speckle Pattern Interferometry (ESPI), which use Helium-Neon (He - Ne) as laser light source. A speckle pattern is produced by scattered light on the surface of the measuring object due to the interference of laser beams, and it will be captured by Charge Coupled Device (CCD) camera. Afterwards Linear Binary Pattern (LBP) and Self Quotient Image (SQI) methods are used to reduce illumination effect in the captured image. The average gray-level from the previous process will be converted into a surface roughness value by gray level to surface roughness conversion formulation. It is obtained from correlation value between gray level and a set of standard roughness. The standard roughness value range is start from 0,05 μm to 12,5 μm. It is measured from five different final machining process, which are flat lapping, grinding, horizontal milling, and vertical milling. As verification, the results of ESPI method will be compared with the result of direct contact tools using Mitutoyo Surftest 301 and 401.
Strain Sensing Comparison Between Single and Multimode Fibers using Optical Low Coherence Interferometry Matiin, Nafiul; Hsu, Shih -Hsiang
IPTEK Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (768.53 KB) | DOI: 10.12962/joe.v2i1.453

Abstract

Optical low coherence interferometry is one of the accurate optical sensing technologies and widely utilized in various physical sensing properties. The system principle is to characterize the relative interferogram movement distance caused by the various strain on a sensing arm. An interferometric strain sensor from two-stage Mach-Zehnder interferometer was demonstrated for double sensitivity improvement. The strain performance comparison between single and multimode fibers will be analyzed for fiber sensing applications. The stepper motor was set up with a movement distance of 20 nm in every step and the velocity could achieve 10000 step/s. The fiber strain was characterized as 22.22 με on a 9-cm length. The experimental results demonstrated the multimode fiber sensitivity is higher than single mode fiber. Repeatability of both single and multimode are uncertain. The interferogram movement distance from the multimode fiber was higher than a single mode and demonstrates higher sensitivity
Modeling Response of Concrete Material due to Biaxial Loading using Finite Element Method Software Based Iranata, Data; Wahyuni, Endah; Amalia, Aniendhita Rizki; Anggraini, Sylvya
IPTEK Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (747.909 KB) | DOI: 10.12962/joe.v2i1.465

Abstract

Generally the concrete behavior can be observed by the experimental analysis. However, since the computer technology development has been increased rapidly, the computer simulations are also able to represent the detail behavior of concrete. This paper presents the modeling response of concrete material subjected to biaxial loading using finite element method software based. The plain concrete plates with dimensions 200mm x 200mm x 50mm and 150mm x 150mm x 50mm are analyzed using various combinations of biaxial loading. The results of the biaxial load combinations are covering the three non-linear regions of compression–compression, compression–tension, and tension–tension. The results of finite element analysis are also show good agreement to the experimental results that been taken from the previous study. The comparison results the difference between analytical and experimental study are less than 5%. Therefore, the concrete material model based on this finite element method software can be used to simulate the responses in the real condition
The Effect of Ship Coefficients on the Efficiency Gain f Propeller-Vane System Leksono, Setyo; Utama, IKAP; Djoni, MA; Aryawan, WD
IPTEK Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (350.411 KB) | DOI: 10.12962/joe.v2i1.467

Abstract

This paper discusses a correlation between non dimensional parameter of the ship (L/B,B/T, wake fraction, ratio between induced and advance velocity, thrust loading coefficient) and energy gain by applying vane-turbine in the propeller slipstream. The data based on the basis of statistical data (numerical) and model testing. The correlation data can be calculated by quantifying the contribution of causal variables to a targeted effect variable directly and indirectly through other variables and this would be examined by Path analysis. By using this coefficient, it is possible to demonstrate which variable has the main contribution on the efficiency gain. The Data analysis of Microsoft Office Excel software is used to approach the calculation. It is found that L/B and CT affected indirectly the efficiency gain of vane-turbine
Sensor Coordination for Behavior of Search Robot Using Simultaneous Localization and Mapping (SLAM) Sulistijono, Indra Adji; N, Endah Suryawati; B, Eko Henfri; A, Ali Husein; S, Ananda Verdi
IPTEK Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Original Source | Check in Google Scholar | Full PDF (653.573 KB) | DOI: 10.12962/joe.v2i1.473

Abstract

We developed a robot for searching victims for survivors of natural disasters. Almost all robots need to navigate a state in the environment to help people around them, therefore the robot should have performance a mapping system. Thus improve the performance of robots in knowing the obstacles, the position and the direction toward the robot with the task of each sensor is to detect obstacles or objects that exist in the use of ultrasonic sensors to avoid bumping into obstacles, to detect the position and determine the distance of the robot using a rotary sensor encoder and to determine the direction toward, direction and elevation angle of the robot using IMU sensor. Whole of the sensor is set by the microcontroller STM32F407VGT6 that sent data from each sensor to a PC using XBee Pro. Therefore, robot create a mapping with OpenGL on the PC. Mapping system plays an important role for fast and accurate to the destination. We conclude, in the robot SLAM method depends on the precision of the data in the sensor US2 (Right), US4 (Left) and the rotary encoder. The test results of the output data at the right ultrasonic sensor produces error US2 16.9%, 14.6% US4 left ultrasonic and rotary encoder sensor error to 19.45%.

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