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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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Performance Evaluation Zeta Converter Using PI Controller for Energy Management in DC Nanogrid Isolated System Murdianto, Farid Dwi; Sudiharto, Indhana; Wulandari, Eni
INTEK: Jurnal Penelitian Vol 8 No 1 (2021): April 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i1.2651

Abstract

Renewable energy is needed as an alternative energy source. One of the implementations of renewable energy is the Solar Power Plant (PLTS). PLTS is a component that uses solar cells to convert solar energy into electrical energy. Unfortunately, the output power of this solar cell depends on the intensity of the light which causes the output power to enter the load to be unstable. Sometimes the PV power decrease because of the shading effect. From this problem a converter is needed to keep the system output voltage. The converter used in this research is the zeta converter. This Zeta converter can operate like a buck boost converter. The output of the system used is not stable. So that to stabilize it requires good control. In this paper using PI controller to control this system in order to keep the output system stable. 3. The error generated using the PI Control on the system is only 0.34%.
Analysis Of Mechanical Properties SMAW (Shielded Metal Arc Welding) Welding Joints Of Portable Electric Hydraulic Jack Frame Wisnujati, Andika; Andryansyah, Juni
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2134

Abstract

Welding is a very important part of the development and growth of the industry because it has a role in engineering, reparation, and construction. Shielded   Metal   Arc Welding (SMAW) or the conventional arc welding   process is particularly dominant in structural joints, pressure vessels and in maintenance and repair work. In welding, different metals are joined economically and at a much faster rate as compared with other fabrication processes like riveting and casting. The purpose of this research is to find out the cooling media cooler against SMAW smelter tensile strength by using the E6013 electrode. This study uses low carbon steel material that has levels Fe = 98,3%; C = 0,30%, Si = 0,23%. The material is given 75A welding current with cooling variation on the connection result using oil, water, and room temperature. The highest tensile stress value obtained in the oil cooling treatment was 844,76 N/mm2, the highest strain value was obtained on the raw materials of 16%, the highest elasticity value was obtained in the oil cooling treatment of 703.96 N/mm2. According to the research results can be concluded that the variations of cooling media greatly affect the strength of the welding connection.
Groundwater Pumping Management in Controlling Seawater Up-Coning in The North Coastal Area of Makassar Badaruddin, Sugiarto; Azis, Akhmad; Ashari, Muhammad Fadhil; Jannah, Miftahul; Ali, Ilham; Ihsan, Muhammad
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2634

Abstract

In big cities, communities generally consume clean water from local water supply company which uses surface water sources. However, due to the limitations of the company in supplying water, particularly in the dry season, an alternative is required, such as using groundwater without causing over-exploitation. This study aims to determine the optimal rate of groundwater pumping in the coastal aquifer to avoid seawater up coning using SEAWAT V.4 numerical model. The research method was carried out using a GEO-7X GPS device to obtain coordinate's location, land elevation and observation well distance from the coastline. Secondary data in the form of aquifer thickness data and geological map of the site were obtained from previous studies. The salinity test results show that the average salinity value of the ten water samples from observation wells is 36.8 mg/l, which means that the water is categorized as non-saline water (freshwater). These data are in line with the groundwater utilization monitoring activity report of Makassar City Environment Office in 2018, which reported that Ujung Tanah and Wajo Districts were found to be free from seawater intrusion. Even so, the potential for seawater intrusion is still considered high because of the location of community groundwater wells are near from the coast. One of the efforts to prevent seawater up coning is by limiting groundwater pumping. From the numerical modeling results, it is found that the maximum groundwater discharge in the research site, namely P3 is 20% of total flow rate(0.3 m3/day), P5 is 20% (1.32 m3/day), P6 is 40% (0.52 m3/day) and P10 is 20%(0.63 m3/day).
Comparison Method of PI, PID and Fuzzy Logic Controller to Maintain Speed Stability in Single Phase Induction Motors Irianto, Irianto; Murdianto, Farid Dwi; Sunarno, Epyk; Proboningtyas, Dewinta Dwi
INTEK: Jurnal Penelitian Vol 8 No 1 (2021): April 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i1.2687

Abstract

Induction motor speed control is one of the operating conditions that is often used so that feedback with a low error rate is required. To fulfill this, PI and PID controls have been implemented for single phase induction motors. This control has parameters, namely Kp, Ki and Kd. PI and PID controls can cover a variety of desired response conditions, but these controls still have weaknesses in the tuning process. The tuning process used still has a fairly large error value. So in this case we need an intelligent control to meet the desired motor speed response specifications. The performance of motor speed regulation was evaluated using a comparison between PI and PID control with Fuzzy in a closed loop. With a setting point of 1500 rpm, for PI control, with Kp = 7.32 and Ki = 0.005 can produce motor speeds up to 1499. While PID control with Kp = 0.95, Ki = 0.005 and Kd = 0.04 can produce similar speeds. 1492. Fuzzy control can produce an output of 1490 rpm. Fuzzy control is able to produce a settling time of 0.25 seconds and a steady error of 0.67%.
Public Transport Mode Model Selection for public Transport Users in the City of Makassar Based on the Change of Speed Travel Variables Syahlendra, Syahlendra
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2682

Abstract

The increasing number of private vehicles shows that the public transportation system in Makassar has not been maximized. this is also due to the absence of other alternative public transportation modes that can be used by the community in their activities. This study aims to determine the preference of public modes of choice if offered other alternatives, especially public transport with greater capacity. Public transportation offered in this study is busway and monorail. In this study the community was faced with 3 modes of choice namely city transportation, monorail, and busway. The data collection method used was a survey with stated preference based questionnaires, which reviewed nine conditions for variable change in travel speed. The construction of the model was carried out using STATA software and city transportation was used as the base outcome. The model is based on discrete selection models and is analyzed by the multinomial logit model. The results showed that in the nine conditions of change in travel speed, the mode of city transportation was still more dominantly chosen by the community.
Performance Effects of Shock Absorber and Spiral Springs Against Vertical Vehicle Expenses Weighing the Road Structure Ka'ka, Simon; Andre H, Festo
INTEK: Jurnal Penelitian Vol 7 No 1 (2020): In Press
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i1.2298

Abstract

This study aims to examine more about the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road surface in its path. Experimentally this fluctuating load is replaced by a pneumatic force change based on the regulation of air pressure on the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The amount of vertical load transformation reaches the road surface is measured by using Load cell. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modeling method with 2 DOF suspension system transfer function.  The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the spring reaction force and shock absorber can absorb 25% vibration against the sprung and un-sprung vertical load of the vehicle.
Influence of Curing Conditions on Strength Characteristics of Sea Sand Mortar Datu, Irka Tangke; Ali, Adiwijaya; Jalali, Nur Aisyah; Khairil, Khairil
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2720

Abstract

This present paper aims to investigate strength characteristics of cement mortar using natural sea sand as fine aggregate in different curing conditions. Research was carried out with making mortar mixtures by two types of cement, Portland Composite Cement (PCC) and Pozzolana Portland Cement (PPC) with tap water as mixing water. Characteristics of fine aggregate and strength of cement mortar use river sand (RS), sea sand (SS), and washed sea sand (WS) were observed. Further, specimens of cube mortar in size of 50 mm x 50 mm x 50 mm of six mortar mixture series were casted according to Indonesian Standard. At 24 hours after cube specimens were casted, cube mortar specimens were cured in three curing conditions such as tap water curing (TC), seawater curing (SC) and air curing (AC). After curing at certain period (3-day, 7-day, 14-day, and 28-day), cube mortar samples were tested in compressive strength. Results concluded that sea sand aggregate improve characteristic of mortar in compressive strength up to 28 days in all curing conditions, and there was no significant effect of type of curing water (TC and SC) on 28-day strength performance of mortar was obtained. In addition, sea sand could potentially be utilized as an aggregate in production of mortar and/or concrete.
Design of Microcontroller Based Fire Detector with Output Warning SMS Information and Automatic Extinguisher Zain, Abdul; Hartono, Rudi; W, Sri Handani
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2639

Abstract

Conflagration is an unpredictable tragedy. It may occur whether in the woodland areas or in the residential areas. Typically, it would only be recognized if indeed the flames spread and the smoke intensified. This study aims to detect fires using the MQ-2 smoke sensor, DS18b20 temperature sensor, and fire sensor. Using Arduino Uno as the controller, this system’s output is in the form of an alarm buzzer, Short Message Service (SMS) information using SIM800L, and an automatic fire pump. This system operates to detect the temperature shifts, the smoke concentration and the existence of a fire point which triggers an alarm in the form of a siren if two out of the three sensors are activated. It, then, sends information by Short Message Service (SMS) and automatically triggers the pump as the result. The fire sensor can detect hotspots with a maximum distance of 80 cm and the DS18b20 temperature sensor has an average reading error of 0.27 ° C with a maximum reading error of 0.5 ° C. The MQ-2 smoke sensor can detect smoke where the change in smoke concentration is directly proportional to the sensor output voltage. There are three conditions to determine fire conditions, namely the temperature sensor reads more than equal to 55 ° C and the fire sensor is active, or the temperature sensor reads more than equal to 55 ° C and the smoke sensor reads more than equal to 1000 ppm, or the fire sensor is active and smoke sensor reads greater than equal to 1000 ppm.
Effectiveness of Moringa oleifera and PAC (Poly Aluminum Cloride) Leaves in Peat Organic Substances in Rasau Jaya Village, Kubu Raya Regency Ratnawaty, Gervacia Jenny; Salim, Maulidiyah
INTEK: Jurnal Penelitian Vol 8 No 1 (2021): April 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i1.2729

Abstract

One source of surface water in West Kalimantan is peat water that has low turbidity, dark brown to black (124 - 850 units of PtCo), high organic content (138-1560 mg / L KMnO4), and is acidic (pH 3,7 - 5,3). The purpose of this study was to determine the effect of the addition of PAC and Moringa oleifera leaves to the decrease in levels of peat organic water in the Rasau Jaya village area, Kubu Raya Regency. The method used in this research is by mixing Moringa leaf powder and PAC (Poly Aluminum Cloride) in peat water accompanied by stirring and precipitating. Furthermore, peat water samples were analyzed for their organic content using the permanganometric titration method. The results showed that the levels of organic substances in peat water before the addition of PAC and Moringa leaf powder amounted to 176.96 mg / l, after the addition of 125 mg PAC and Moringa leaf powder with concentrations of 25, 50, 75 l , 100, 125, 150, 175, 200 mg/l, respectively: 42.04 mg / l, 46.97 mg / l, 58.14 mg / l, 66.15 mg / l, 67.20 mg / l, 60.25 mg / l, 63.41 mg / l, and 53.07 mg / l. Based on the results through regression statistical tests obtained sig = 0.015 <0.05 which means Ha is accepted that there is an effect of increasing the concentration of Moringa oleifera powder and PAC  on Organic Content in Peat Water in Rasau Jaya Village, Kubu Raya Regency.
Adaptive Power Charge Using PID Controller on DC Load Application Murdianto, Farid Dwi; Sudiharto, Indhana; Irianto, Irianto; Wulandari, Ayu
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2652

Abstract

Battery is a very important necessity as an electrical energy storage for DC load type. However, as electric energy storage, the battery has a limit storage capacity. The battery must be recharged when the electrical energy stored in the battery has been exhausted to keep the DC load in operation. Unfortunately, batteries in different types of DC loads have different voltages and capacities. So for charging the battery also requires a different voltage. While the existing battery charger is generally static specifically for one type of battery. From this problem, the paper proposed an adaptive power charge system. A system that can adaptively charge electrical energy on batteries that have different voltages and capacities through one port. The converter used in this paper is the buck converter to lower the output voltage from the input voltage. The system uses tracking duty cycle to know the type of DC load. After knowing the type of dc load then the system determines the setting point voltage. To keep the output voltage stable, the system uses PID control. With this adaptive power charge, the charging process will be more efficient and multifunction because it can be used for various types of DC load. The system can provide an output voltage of 19 volts when connected to a laptop and provides an output voltage of 5 volts when connected to a mobile phone on setling time 10ms.

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