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INTEK: Jurnal Penelitian
Published by Politeknik Negeri Ujung Pandang
ISSN : 23390700     EISSN : 26155427     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Engineering
INTEK is a journal managed by the Journal and Publication Development Unit of Ujung Pandang State Polytechnic, which is published twice a year, in April and October. The journal INTEK has also been indexed. The INTEK Journal accepts research scripts in the fields of technology and engineering such as: Electrical, Mechanical, Civil and Chemical Engineering.
Arjuna Subject : Umum - Umum
Articles 211 Documents
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Experimental Study on the effect of Cooling Media on Impact Strength in the Heat Treatment Process of Medium Carbon Steel S45C Risal, Syah; Mahadir, Mahadir; Suyuti, Muhammad Arsyad; Nur, Rusdi
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4188

Abstract

Steel possesses mechanical properties that can enhance the hardness and microstructure of its surface, and heat treatment is one way to achieve these properties. This study aimed to investigate the impact of different cooling media on the heat treatment process and the resulting impact strength of S45C medium carbon steel. The steel specimens were heated at various temperatures (800oC, 850oC, and 900oC) in a furnace and then cooled using three different media: water, oil, and air. The study concluded that for all three temperatures, the specimens cooled with oil had the highest impact value. Furthermore, oil and air immersion resulted in ductile fractures, while water immersion caused brittle fractures.
Analyzing the Role of Automatic Voltage Regulator towards Excited Synchronous Generators on the Sultan Hasanuddin Training Ship Hasiah, Hasiah; Mahadir, Mahadir; Risal, Syah
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4189

Abstract

Voltage instability in a synchronous generator can lead to system instability, affecting the quality and ability to transfer power to consumers. The worst-case scenario is load- shedding. To prevent this, the Automatic Voltage Regulator (AVR) is used to control the voltage stability of the synchronous generator. However, the AVR is often damaged, which prompted us to investigate its role in stabilizing the output voltage of the synchronous generator. This study was conducted on the Sultan Hasanuddin Training Ship owned by the Marine Science Polytechnic (PIP) Makassar using experimental research methods. Data collection techniques included observation, measurement, and documentation, and quantitative descriptive methods were used for analysis. Results indicated that the role of the AVR on the Sultan Hasanuddin Training Ship was insignificant since changes in generator load did not result in high fluctuations. The excitation current on the voltage amplifier or the output voltage of the synchronous generator remained within the working limit. This was proven by the generator's rotation speed, which ranged from 1470 to 1500 rpm, and a generator load of 36 to 38 kW.
Determination of erosion and sedimentation potential for sump design at the nickel mine site of PT VALE Petea Indonesia Badaruddin, Sugiarto
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4187

Abstract

PT. Vale Indonesia plans to mine at the Petea location using the open pit method. If viewed from the watershed boundary, the planned mining location is located in the upstream part of the Lamunto watershed. In connection with the existence of the mining plan, a solution is required to prevent things that can harm and damage the surrounding environment prior to implementation, especially related to soil erosion which is expected to impact the Lamunto watershed which is the outlet of the planned mining location. The method used in this study is to analyse the potential for erosion that occurs using the USLE (Universal Soil Loss Equation) method with the help of the ArcGIS application. Furthermore, the calculation of the sedimentation rate is carried out using the SDR (Sediment Delivery Ratio) equation based on the calculated erosion rate and the area of the mining plan that will be used to plan the sump (sediment storage tank). The results showed that the total sediment potential in sumps A, B, C, D, E, F, G, and H was 550.39 m3/year, 1195.31 m3/year, 1588.43 m3/year, 1908, 27 m3/year, 2423.33 m3/year, 1899.53 m3/year, 1941.76 m3/year, 2169.15 m3/year and 2756.29 m3/year, respectively. From these results it can be seen that the slope factor (LS) is more influential than the catchment area in calculating the sediment potential as evidenced by the total sediment potential in sump D which is greater than sump F.
GUI Development for Economic Dispatch Analysis on Sulselrabar Power Plant Hamzah, Nur; Djalal, Muhammad Ruswandi; Musa, La Ode; Buana, Chandra
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.3741

Abstract

The take or pay contract between PT. PLN (Persero) with Independent Power Producer (IPP), a power plant belongs to PT. PLN (Persero) is no longer operated optimally, for example, the Barru steam power plant. The steam power plant is a power plant that bears the primary load. The actual conditions in the Barru steam power plant field are charged a maximum of only 3-4 hours or only when the peak load is according to the dispatcher's request. This research examines comparing the economy dispatch method to maximize conditions in the Barru steam power plant, which dispatchers no longer order maximally. So that the Barru power plant operator can determine the distribution of the power allocation ordered by the dispatcher to the two power plant units of the Barru steam power plant, the method being compared is the lambda iteration method. The basis for calculating the two ways is to calculate in advance the characteristics of the fuel consumption of the power plant when operating in one day. The primary data is data on the results of electricity production issued by the generator and fuel consumption taken from the coal feeder flow. Based on the research results, it is known that the lambda iteration method can save production costs of Rp. 9.05 per KWH.
Performance Testing Of Sand And Lime As Subgrade Stabilizing Materials For Roads Novianto, Dandung; Marjono, Marjono; Sholeh, Moch.; Anggraini, Novita
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4252

Abstract

Soil stabilization is a method used to increase the carrying capacity of a layer of soil, by giving special treatment to that layer of soil. Soil is one of the factors that can affect the structure of road construction. The CBR value is one of the parameters to determine soil carrying capacity, if the CBR value is high then the soil carrying capacity is good, whereas if the CBR value is low then the soil needs to be stabilized. The purpose of this study was to determine the characteristics and classification of soil, determine the results of the grain gradation test, sieve analysis and hydrometer analysis, consistency limits (Atterberg limits) before and after stabilization, compaction results (Proctor) before and after stabilization, determine the CBR value of the soil before and after stabilization. This research included water content test, wet soil unit weight test, specific gravity test, sieving analysis, hydrometer analysis, Atterberg limit test, compaction test (Modification), and immersion CBR test and CBR without immersion. In this test, variations in the addition of 20% sand and lime content were 5%, 10% and 15% of the dry weight of the soil. From the test results, the original soil samples showed soil classification A-7-6 according to AASHTO with maximum dry density (MDD) values of 1.70 gr/cm3 1 day curing, 1.64 gr/cm3 7 days curing and 1.77 gr/cm3 for 14 days curing, there was an increase in the value of the maximum dry density (MDD) in the original soil stabilized with 20% sand and 5% lime, a value of 1.78 gr/cm3 was obtained for 1 day curing, 1.86 gr/cm3 cm3 7 days curing and 1.82 gr/cm3 14 days curing. From the test results, the original soil samples showed soil classification A-7-6 according to AASHTO with CBR values of soaked 3.15% 1 day curing, 3.68% 7 days curing and 4.21% 14 days curing, there was an increase Soaked CBR values on native soil stabilized with 20% sand and 5% lime obtained CBR values of 37.19% at 1 day curing, 42.10% 7 days curing and 30.29% 14 days curing.
Characteristics of AC-WC Asphalt Concrete Mixtures with Polystyrene Addition Fahmi, Rizky Hadijah; Erdiansa, Andi; Nursamiah, Nursamiah; Fattah, Abdul
INTEK: Jurnal Penelitian Vol 10 No 1 (2023): April 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4229

Abstract

The top layer of pavement that functions as a wear layer is called AC-WC/ Laston. Improving the quality of flexible pavement continues to be developed in order to create transportation support facilities that are safe, strong and durable, but still economical. The use of additives is one way out that can be done in order to get a high quality product. The purpose of this research is to identify the optimum asphalt content to be used in the manufacture of polystyrene asphalt mixtures and to determine the characteristics of asphalt mixtures using polystyrene additives. The method used was to add polystyrene in the form of styrofoam which had previously been dissolved using gasoline into hot asphalt with a percentage of polystyrene mixture of 3.0%, 3.5%, 4.0%, 4.5% and 5.0% of the optimum asphalt content used. Based on the results of testing specimens with additional polystyrene, VIM and VMA values increased at levels of 3.0% to levels of 4.5% exceeding the upper limit of VIM specifications, but still within specifications. The stability value increased along with the increase of polystyrene from 3.0% to 5.0%, where this value meets the specifications. The flow value increases from 3.0% to 3.45% levels exceeding the upper limit of the specification then decreases after 3.45% levels to 5.0% levels where the flow value meets specifications. The conclusion that can be drawn is that the addition of polystyrene mixture in AC-WC can increase the hardness level of the Laston mixture.
Inverse Kinematic of 1-DOF Robot Manipulator Using Sparse Identification of Nonlinear System Darajat, Anisa Ulya; Murdika, Umi; Repelianto, Ageng Sadnowo; Annisa, Resty
INTEK: Jurnal Penelitian Vol 10 No 1 (2023): April 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i1.4202

Abstract

Robot Manipulator is the most robot used in industry since it can act like a human arm that can move objects. Research on robot manipulator has been widely carried out in various problems such as control systems, intelligence robots, degrees of freedom, mechanics-electronics systems and various other problems. In control systems there are studies to design of robot motion through kinematics. However, modeling the kinematic motion which has nonlinear characteristics will be more difficult if the number of degrees of freedom increases. To overcome this problem, this research will proposed sparse regression to modeling the kinematics of a robotic arm with the black box principle modeling. The results obtained indicate that the method The proposed one has the ability to identify robots manipulator with a fitness score of up to 100%. This matter shows that the proposed method can modeling the kinematic inverse of the manipulator robot without through complex calculations. From this research is expected can provide other research opportunities related to identification kinematics with the identification system method
Unconfined Compressive Strength Of Sedimentary Soil Stabilized With Portland Cement With Varying Curing Time Nursamiah, Nursamiah; Fattah, Abdul; Fahmi, Rizky Hadijah
INTEK: Jurnal Penelitian Vol 9 No 2 (2022): October 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4234

Abstract

Soil improvement is commonly carried out in construction work with the aim of increasing the bearing capacity / strength of the soil so that it can carry the construction load that will stand on it. The method that is often used is soil stabilization with the addition of stabilization materials. In this study, soil stabilization was carried out with the addition of Portland Cement. This research begins with soil sampling and laboratory testing to determine the physical and mechanical properties of the soil, followed by making soil samples for Unconfined compressive strength testing with 3 variations of cement, namely 5%, 10%, and 20%. From the results of this study, it is known that the soil sample has a moisture content of 97.13%, specific gravity of 2.51, liquid limit of 33.80% and plasticity limit of 22.52% with plastic index value = 11.28%. Based on the soil classification system with the USCS (Unified Soil Classification System) method, sedimentary soil types include CL (Clay-Low) soil types, clays with low plasticity values. Unconfined compressive strength testing on sedimentary soil samples without portland cement obtained a compressive strength value of 0.352 kg/cm2. And the soil stabilized with various variations of Portland Cement obtained the highest compressive strength value of 14.45 kg/cm2, namely in the soil sample + 20% cement with 28 days curing time. The results showed that the value of Unconfined compressive strength for sedimentary soil dredging dam bili-bili stabilized with Portland cement tends to increase its bearing capacity / strength with the addition of the percentage of Portland cement and curing time, with this value the category of hard soil consistency obtained can be used for building structures and road base soils.
Papaya Fruit Quality Classification Based on Lab Color and Texture Features Using Artificial Neural Networks (ANN) Andayani, Dyah Darma; Rafii, Andi Noer Aksha; Mahdar, Kaerurrijal; Ahmad, Winda Andrayani; Mustamin, Mustamin
INTEK: Jurnal Penelitian Vol 10 No 1 (2023): April 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4246

Abstract

The process of sorting the quality of papaya fruit is a postharvest problem. So far, humans still do the quality sorting process conventionally or manually. It certainly has weaknesses and limitations, which require a large workforce, and the level of human perception of the quality of papaya varies. Several studies have been carried out regarding the classification of papaya fruit quality, but these studies have accuracy that can still be improved. Therefore, in this study, it is proposed to determine the quality of papaya fruit based on LAB colour and texture features using an Artificial Neural Network (ANN) algorithm. This research consists of six stages: image acquisition, pre-processing, segmentation, morphology, feature extraction and classification. The classification process for the training stage produces the highest level of accuracy in three training scenarios; namely, two techniques have 100% accuracy and 99.58% in the third scenario. Based on the best training scenario selected, the testing process produces 98.88%, the highest accuracy rate with a misclassification error of 1.12% and 69 seconds of computing time. These results indicate that the proposed method can accurately classify papaya quality based on LAB colour and texture features.
An Overview of Commonly Used Steel Beam-Column Connection in Indonesia for Low-Rise Building Yuana, Prima Sukma; Moestopo, Muslinang; Kusumastuti, Dyah; Pratiwi, Naomi
INTEK: Jurnal Penelitian Vol 10 No 1 (2023): April 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i2.4135

Abstract

The Indonesian seismic provision for steel structures was initiated in 2002. The use of steel has also been increasing as a choice of structural material since then. However, there are still many weaknesses in the seismic design of steel structures that have been carried out so far. A lot of beam-column connections in steel buildings in Indonesia use a haunch in a moment-resisting connection system. Haunched systems are not described in AISC 358 as permitted connections for earthquake-resistant buildings. Recently, Europe publishes European Prequalified Steel Joints (EqualJoints). There are four types of connections discussed, and one of them is the haunched type connections. The haunched connection meets the seismic requirements to be suitable for use as an earthquake-resistant connection in Europe. This can be used as a reference if we are going to design a haunched connection in Indonesia. However, special attention should be paid to the details. The bolt configuration, the thickness of the end plates, and the shape of the haunch are not like those commonly used in Indonesia, there must be improvements to be adjusted in EqualJoints. So that the performance of the connection against earthquakes becomes more guaranteed.

Page 17 of 22 | Total Record : 211

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