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Logic : Jurnal Rancang Bangun Dan Teknologi
Published by Politeknik Negeri Bali
ISSN : 1412114X     EISSN : 25805649     DOI : https://doi.org/10.31940/logic.v21i3
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Logic : Jurnal Rancang Bangun dan Teknologi is a peer-reviewed research journal published by Unit Publikasi Ilmiah, Pusat Penelitian dan Pengabdian Masyarakat, Politeknik Negeri Bali, aiming at promoting and publishing original high quality research in all disciplines of engineering and applied technology. All research articles submitted to Logic should be original in nature, never previously published in any journal or presented in a conference or undergoing such process across the world. All the submissions will be peer-reviewed by the panel of experts associated with particular field. Submitted papers should meet the internationally accepted criteria and manuscripts should follow the style of the journal for the purpose of both reviewing and editing.
Arjuna Subject : Teknik (semua kategori) - Tenik Industri dan Manufaktur
Articles 161 Documents
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Evaluation of Flood Handling at Seminyak Way II, in The Tukad Mati Drainage Sub System I Gusti Ngurah Kerta Arsana; Mawiti Infantri Yekti; Dewa Ayu Utari Winandari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.175-181

Abstract

Flood is a natural phenomenon that often occurs in several areas of Badung Regency. Losses result in damage to buildings, roads, and other public facilities. Floods are caused by a more sloping land topography, changes in land use to dense settlements, and soil conditions. This study aims to deal with flooding by evaluating the existing canal on Jalan Kunti II Seminyak. The method used for testing data consistency is the RAPS (Rescaled Adjusted Partial Sums) method. The distribution used is Log Person Type III. Testing of frequency distribution used the Smirnov – Kolmogorov Test and the Chi-Square Test. Analysis of rainfall intensity using the Mononobe formula. Calculation of planned flood discharge (Q) uses the Rational method, Nakayasu method, and theoretical discharge control for 2, 5, 10, and 25-year return periods with the existing channel capacity. The result of the analysis shows that the theoretical discharge with a return period has met of planned flood discharge so that the drainage on Jalan Kunti can accommodate the planned flood with a return period of 10 years. Where the drainage capacity of Jalan Kunti is 0,412 m3/second & 0,461 m3/second. The drainage ditch with a capacity of 200 m3/second to Tukad Mati has not been able to accommodate the planned flood discharge for the 25-year return period of 242.33 m3/second. The Tukad Mati channel for the existing Q 675,825 m3/second has been able to accommodate the flood discharge Q at the 25-year return period of 314.49 m3/second.
Analysis of the Selection and Installation of a Pump for an Overflow Swimming Pool with a Volume of 67 Cubic Meters Achmad Wibolo; I Ketut Suherman; I Dewa Made Pancarana; I Ketut Adi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 2 (2023): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i2.138-146

Abstract

In the swimming pool there is a pump system that is useful for circulating water. Pumps  in  swimming pools can affect water quality. Dirty  water will be cleaned by the  filter  and  will  be re-circulated to the swimming pool. The calculations  that  must  be  known  are  the  volume  of  the swimming  pool,  pump  power, flow rate, and the curve of  the pump. In  order  for  the  selection of a swimming  pool pump  to be  appropriate, the  correct  calculation  must  be made  so that the pump  can provide  the best  performance for a swimming pool with a volume of 67 cubic meters  and is able to circulate swimming pool water 4 times  during 12 working hours.
The Effect of Holding Pressure and Inject Pressure to Short Shot Defect in Injection Molding Cover Pot: Pengaruh Holding Pressure dan Inject Pressure Terhadap Short Shot Defect pada Proses Injection Molding Cover Pot Muhammad Sambodo Aribowo; Agus Dani
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 2 (2023): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i2.147-154

Abstract

The influence of inappropriate injection molding parameters often results in product defects, one of which is the short shot, which is a condition where the plastic to be injected into the cavity does’t reach the ideal capacity. The purpose of this research is to understand and be able to explain the parameters of holding pressure, inject pressure, and the interaction of these two parameters on short shot defects in cover pot products with the injection molding process. This research uses independent variables, namely holding pressure with variations of 20 Bar, 30 Bar, and 40 Bar and inject pressure with variations of 15 Bar, 30 Bar, and 45 Bar and dependent variables in the form of short shot defects. The method used in this research is a factorial experiment with replication of 10 (ten) times and data processing analysis using ANOVA with the help of Minitab 21.2.0 statistical software. The result of this research is that there is a significant influence of holding pressure, inject pressure, and the interaction of these two parameters on short shot defects in cover pot products with injection molding process. The average weight of the product produced at the interaction of the parameters holding pressure 40 Bar and inject pressure 45 Bar is 8.8 grams (normal) so as to minimize product defects to improve the quality and quantity of cosmetic packaging production cover pot.
Effect Of AC Compressor Modification on Fuel Consumption in Car Mokh Hairul Bahri; Dudi Irawan; Adi Pratama Putra
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.219-224

Abstract

The cooling system is a refrigeration technology that is growing, especially regarding the cooling medium (refrigerant), new vehicles nowadays mostly use air conditioning to condition the air in the vehicle's cabin, but for now, there are still many aspects that have not been given much attention, especially the compressor. Compressor systems in vehicles still rely on the engine as a direct drive resulting in increasingly wasteful fuel consumption and reducing the performance of the vehicle. This study analyzes the results of modifying a conventional compressor into an electric compressor by utilizing a split AC compressor whose supply voltage is obtained from a DC to AC inverter on vehicle fuel consumption and the required electrical energy. Inverter modification is highly recommended in the application of car air conditioners, split AC compressors, and others. The results of this research show that AC compressors using split compressors affect fuel consumption.
Ultrasonic Pulse Velocity Test Using BS Method And T-Method to Estimate Crack Depth of Concrete Evin Yudhi Setyono
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.164-168

Abstract

Ultrasonic Pulse Velocity (UPV) as a non-destructive test is commonly used on concrete crack estimation. There are several methods are applied based on the transducer configuration. Among the methods, BS (British Standard) method and T method was used in this study. On this method, transmitter was fixed at certain distance from crack and receiver was moved at several constant intervals, then crack depth was analyze from the relation between the transducer distance and the transit time curve. This research is conducted to study the accuracy of BS method and T-method in estimating the crack depth of concrete using NDT James Instrument V-Meter M-K IV. Concrete beams were made with artificial crack depth 2 cm, and 4 cm. Transducers 54kHz of UPV Mark IV were set at constant interval. Thus, the comparation of actual depth and experimentally result was analyzed. The study concluded that, the accuracy of the BS method has a better estimation result with a relative error of 27,75% and 35,95%, compare to the T-method that has 79,30% and 79,82% error.
Innovation Design the Text to Braille Based Technology in Computer Vision Adi Pratama Putra; Muhamad Khoirul Anam; Muhammad Zainal Roisul Amin; Rezki Nalandari; Adi Mulyadi; Harwanti Noviandari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.182-187

Abstract

This paper discusses the design of assistive technological innovations for writing text on books onto braille boards and computer vision-based sound. So far, programs for converting writing into braille are still very difficult to find, changing from written form to sound. The design for the development of assistive technology that will be produced refers to an analysis of the current needs for blind students, where these students can only read Braille, not Latin. Broadly speaking, this research is image processing of Latin letters with board braille output and sound using a camera scanner with an algorithm processing on the Raspberry Pi system, so that scripts with Latin characters can be enjoyed by the blind.
Public Transportation Line Passenger Prediction Using Mamdani Method of Fuzzy Logic to Foresee Holiday Passenger Surge Elfira Makmur; Dessy Ana Laila Sari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.188-193

Abstract

This study aims to predict the number of passengers on the Mall Pannakkukang-Galesong Harbor route on the "Teman Bus" fast transit transportation system in Makassar City. Public transportation modes often face the problem of an imbalance between the number of buses and the number of passengers, which can reduce the comfort and efficiency of passenger mobility. To overcome this problem, this study uses a fuzzy logic approach, specifically the Mamdani fuzzy method, to predict the number of passengers who will take the bus based on input variable data that has been collected, such as day temperature and weather, as well as the output variable, namely the number of passengers. The results obtained in this study are based on the inputs given, namely the day with a value of 0.5 and the weather temperature with a value of 30. The number of passengers is 1500, which means the number of passengers is included in the quiet category.
Effect of Current Strength and Flow Rate of Shielding Gas on the Impact and Tensile Strength of GMAW Welsing Result on SPHC Materials Radhi Nurvian Amrullah; Subagiyo
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.194-202

Abstract

GMAW welding is one of the welds that is easy to use, especially for welding low-carbon steel that is generally widely used in the process of making frame structures, an example is a car frame which is generally made using materials that have strong, ductile, lightweight, and able to withstand impact and tensile loads when the car is used, one example of the material is SPHC. The problem is that GMAW welding results are affected by welding parameters. In this study, the parameter chosen was the strong variation of the welding current. The purpose of this study is to determine the strong influence of the current and flow rate of protective gases as well as the interaction on the impact and tensile strength of GMAW welding results on SPHC materials. This study used an experimental method with current strength parameters worth 120A,130A, and 140A as well as variations in the flow rate of protective gases, namely 15 liters/minute,20 liters/minute, and 25 liters/minute. The results of research in general, the impact strength on the weld metal has a lower result than the row material, and the tensile strength on the weld metal has a higher yield than the row material. From the study, it can be seen that the optimal current strength and flow rate of protective gas is a current strength of 140 A and a flow rate of protective gas worth 25 L /minute with an impact strength of 2.91 J/mm2 and a tensile strength of 431.72 MPa.
Study of Immersion Behavior and Thermal Stability of Green Composite PLA/Bamboo Komang Widhi Widantha; Risa Nurin Baiti; Made Widnya Kusuma
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.156-163

Abstract

One way to address environmental problems caused by the use of synthetic materials is by exploring the potential of new materials that are more environmentally friendly. This research aims to develop PLA/bamboo green composites by investigating the effects of fiber composition and alkali treatment on the thermal stability and immersion behavior of the composites. PLA/bamboo composites were produced using the hot press method with bamboo fibers at 10, 20, and 30 wt.% concentrations. Alkaline treatment was conducted using a 5% NaOH concentration for 24 hours. The PLA/bamboo composite exhibited weight gain due to water absorption during the soaking process. The inclusion of bamboo composition increases the water absorption of the composite, whereas alkali treatment decreases the water absorption of the composite. Furthermore, the introduction of fibers also reduces the degradation temperature of the composite. This research is expected to provide valuable insights for the broader utilization of green composite materials.
Design of Clean Water Booster Pump for High-Rise Buildings Luh Putu Ike Midiani; I Made Duta Irawan; Ketut Bangse; I Nyoman Gunung
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 23 No. 3 (2023): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v23i3.203-211

Abstract

A sanitary system is a supporting component designed to meet the clean water requirements of a building, primarily for sanitation activities. The average sanitary equipment used typically requires a shower pressure of ±1 Bar. However, the shower pressure can be significantly affected by factors such as the distance from the top tank and the building's layout, considering only the pressure due to gravity. To address inadequate shower pressure, an auxiliary pump known as a booster pump is necessary. The need for a booster pump is determined by the cumulative demand from plumbing equipment, where the total capacity required is 6057 liters/hour. To address this demand, the system employs two pump units, each with a capacity of 3 m3/hour. The distribution pipes utilized in the system adhere to established standards and are made of random polypropylene with a diameter of 2 inches and a flow rate of 0.005889 m3/second. The overall head loss resulting from this installation amounts to 31.62 meters. To accommodate the booster system, a pressure tank with a capacity of 67 liters is employed. The minimum working pressure required for the pumps is 1.8 Bar.

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