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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 171 Documents
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The Effect of Injection Pressure and Injection Temperature in The Compression Moulding Process on Flashing Defects of Shoulder Products Moh Hartono; Febrian Akbar Pratama
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.13-18

Abstract

Plastic objects are everywhere: toys, household utensils, playthings, and cosmetic containers. One of the processes used was the plastic production process in the compression molding process to make a cover (shoulder) on the tube. Flashing defects are one of the biggest defects that can cause a product to fail in the assembly of shoulder extrusion tube products in PT. XYZ. This research was to determine the effect of injection pressure and injection temperature parameters on flashing defects in shoulder extrusion tube products. This research uses quantitative research and experimental research methods to collect data. Varying parameter settings carry out this method with an injection pressure of  4 bar, 5 bar, and 6 bar as well as injection temperatures of  250°C, 260°C, and 270°C. The results of the study show that both parameters have significant effects on the flashing defects in shoulder extrusion tube products. The combination of injection pressure of 4 bar and injection temperature of 250°C resulting in flashing defects of 0 mm or no defects.
The Effect of Sengon Wood Powder Particle Size and Composite Composition on The Performance of Non-Asbestos Brake Linings Robby Ridwan; Moh Hartono
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.1-12

Abstract

The purpose of this study was to determine the effect of particle size and composite composition on the mechanical properties of non-asbestos brake linings. This type of research uses quantitative experiments. There are 3 kinds of variables used, namely a) independent variables consisting of particle size and composite composition; b) dependent variables consisting of hardness value and wear rate value; c) controlled variables consisting of shore D durometer method and Wear Rate with 800 rpm, 120 seconds time, and 20 psi pressure. The data analysis technique uses the factorial anova method because it is to determine the effect of the interaction between particle size and composite composition on brake lining. Data analysis was carried out twice, namely hardness test data and wear rate tests. After that, the data obtained was processed using the Minitab application. The results showed that particle size and composite composition affect the hardness and wear of brake lining. Smaller particle size increases hardness, especially in specimens using Fe composition. The use of iron powder resulted in higher hardness. Iron powders with better mechanical properties showed lower wear rates. The interaction effect of particle size and composite composition on brake lining performance is that the interaction of the two independent variables has a significant effect on brake lining performance.
INVESTIGATION OF TEMPERATURES AND HOLDING TIMES ON HIGH-STRENGTH LOW-ALLOY STEEL FOR TANK TRACK LINKS Selly Septianissa; Komang Widhi Widantha; Muhamad Waldi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.87-92

Abstract

In Indonesia, the reliance on foreign countries for military components persists, including tank track links which are crucial for combat vehicles. These components require mechanical properties such as wear resistance and toughness to ensure high safety standards. High Strength Low Alloy (HSLA) steel is used, necessitating precise composition and appropriate heat treatment processes. This study varied compositions and heat treatments to achieve desired properties, producing prototypes with five predetermined compositions. The heat treatment process involves initially heating the samples to 860°C for 30 minutes for uniformity, followed by various treatments including quenching in oil, normalizing, and multiple cycles of quenching with tempering at different temperatures and durations to refine microstructure and adjust hardness of the alloy. Results showed optimal mechanical properties in composition no. 4 after normalizing with a blower, achieving a hardness of 31 HRC. This research aimed to optimize mechanical performance during operational conditions through variations in temperatures and holding times.
The Effect of Chiller and Hot Runner Temperature on Appearance of 100 mL Pet Bottle Products Through the Stretch Blow Molding Process Moh. Hartono; Prihadi Mulya Pradana
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.117-128

Abstract

The using of plastic in human life is increasing over time. This increase occurs because plastic is not easily broken, flexible, practical, economical, and can replace the function of other items. One of the plastic molding processes is Injection Stretch Blow Molding, a plastic molding machine method that combines two processes, namely injection molding and stretch blow molding. The injection stretch blow molding process is a plastic molding machine that is melted and then injected into the mold to form a preform that is stretched and blown to form the product. This machine has a high level of precision so that the aspects of strength and appearance quality on the packaging bottle are the main assessment. The aim of this research is to determine the effect of temperature parameters on black spots, stripes and stripes on 100 mL PET bottle products. It is necessary to handle chiller temperature, hot runner temperature as independent variables in printing preforms.  The control variables are material composition, cycle time, holding time, and component gap position. This type of research is experimental research and the processing method used in this research uses the design of experiments using statistical software. The level of variation in hot runner temperature parameter settings is 265°C, 270°C, and 275°C and chiller temperature is 17°C, 18°C, and 19°C. From the results of this research, it can be concluded that the significant parameters used for the chiller are 18°C, the appearance defect is 0.2% and for the hot runner it is 270°C, the appearance defect is 0.4%. This number is a significant parameter that produces fewer appearance defects for 100 mL PET bottle products in order to reduce the number of rejects.
APPLICATION OF MODE SHAPE DATA BASE INDICATOR (MSDBI) FOR DAMAGE DETECTION OF STEEL FRAME BRIDGE STRUCTURE BASED ON MODAL ASSURANCE CRITERION (MAC) Prima Adhiyasa
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.93-100

Abstract

The substantial expansion of the global economy and the extensive urbanization witnessed in recent decades have rendered bridge infrastructure as a vital component of transportation systems. Conducting structural damage detection is a vital strategy to prevent structural failures and avert bridge collapse. One popular approach for detecting damage is to use mode shapes as characteristics in structural dynamics analysis. In this study, the identification of the mode shapes in the damaged condition will utilize the Modal Assurance Criterion (MAC), while the location of the damage within the simulation will be identified using the Mode Shape Data Base Indicator (MSDBI). The study was carried out with the help of a finite element model using Midas Civil software with a case study of a steel frame bridge. Referring to the report studied, damage identification focused on damage caused by loose bolts. The results of the analysis show that the MAC analysis has consistent values on mode shapes in each damage simulation with the mode shapes produced by the healthy condition model. Meanwhile, damage location is detected by the MSDBI index value in each damage simulation. It can be seen that the MSDBI index changes according to the location of the damage.
Characterization of Municipal Solid Waste as An Energy Source in The Gasification Process I Wayan Temaja; I Nyoman Suprapta Winaya; I Ketut Gede Wirawan; Made Sucipta; I Putu Angga Yuda Pratama
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.129-134

Abstract

Municipal solid waste (MSW) poses significant environmental challenges if not managed effectively. The composition and quantity of MSW are closely linked to the socioeconomic structure of a given area. This study aimed to assess the feasibility of utilizing raw materials from Denpasar's MSW for gasification processes. Samples were collected, segregated, processed, and dried for analysis. Various physical and chemical properties were examined, including moisture content, volatility, fixed carbon, elemental composition, and calorific value. Proximate analysis on dry base sample revealed that the MSW contained 12.45% moisture, 54.68% volatile matter, 13.05% fixed carbon, and 19.82% ash. Ultimate analysis showed the following elemental composition: 64.46% C, 11.5% H, 18.3% O, 0.5% N, and 0.05% S, with a calorific value of 11.99 MJ/kg. Based on these findings, the implementation of a waste-to-energy program utilizing gasification processes for waste management is recommended.
Influence of MIG Welding Process Parameters on the Strength of Bimetal Joints: Study of Gas Flow Rate and Macrofractures Talifatim Machfuroh; Kris Witono; Septyana Riskitasari; Etik Puspitasari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.141-149

Abstract

Bimetal joints are often used in various industries, such as automotive, power generation, electronics, and manufacturing. This is because bimetal joints allow the joining of two types of metal with different properties. Welding two different types of metal can pose its own challenges, such as the difficulty of controlling welding parameters so that the results are optimal for both types of metal, as well as differences in the thermal and mechanical properties of the two metals. This has led to extensive research on bimetal plate connections. Based on this background, this research aims to determine the effect of variations in flow rate and current strength on the tensile strength of robotic welding bimetal welded joints, as well as determine the results of macro photos of fractures resulting from tensile tests for each variation. The research was carried out experimentally where each variation was repeated with data 3 times. Based on the results and discussion, it is known that the optimal gas flow rate in general is 20 l/min, where the tensile strength reaches 353.1442 MPa–455.5458 MPa. At this flow rate, the dominant fracture occurs in the base metal and is ductile, which indicates good plastic deformation. On the other hand, gas flow that is too low or too high causes joint defects and reduces the tensile strength. Meanwhile, other welding parameters, namely variations in welding current, affect tensile strength. At a gas flow of 10 l/min, increasing the current to 180 A produces the highest tensile strength of 449.4357 MPa with ductile fracture characteristics. However, at a current of 120 A there is a significant decrease due to overheating, especially at higher gas flows such as 20 l/min and 30 l/min, which results in brittle fracture in the heat-affected zone (HAZ). The results of this research contribute to the understanding of the influence of welding parameters on the tensile strength and fracture characteristics of bimetallic joints. This research can be a reference for the development of more efficient and reliable welding processes in various industries, such as automotive, power generation and manufacturing, which require bimetallic joints with optimal quality.
Design of a Groutless Clear Coffee Machine Using Distillation Method Adi Pratama Putra; Megandhi Gusti Wardhana; Charis Fathul Hadi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.135-140

Abstract

Coffee is a plantation commodity that is made into a drink as one of the products that is popular with the public. Many coffee drink innovations have been made, one of which is a clear coffee drink without dregs. The process of making clear coffee can be done by the distillation method, namely the process of condensing the steam produced by a mixture of coffee powder and water. This study aims to obtain the design results of a clear coffee machine without dregs using the distillation method. The design is carried out based on the results of a patented study on making clear coffee. The coffee machine is made with a heating tube for a mixture of ground coffee and water, a steam collector tube and a distillation tube. The design results obtained a heating tube with a diameter of 25 cm and a height of 27 cm for a process capacity of 13.25 liters. Heating is performed using an LPG-fueled heater. The distillation process is carried out by cooling the water using a 15 watt aerator pump. The trial was carried out by processing 500 grams of fine coffee powder mixed with 2000 ml of water. The trial results obtained 500 ml of clear coffee with an average process time of ± 25 minutes.
Analysis of The Effect Evaporator Fan Rotation Variations on Air Blast Freezer Performance for Freezing Mango Puree Wardika; Yudhy Kurniawan; Aa Setiawan; Muchammad Zuhda Alifun Naja
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.150-159

Abstract

Mangoes are the main commodity in Indramayu Regency, but they are easily damaged after harvesting due to improper mango processing. One solution to overcome this problem is to process mangoes into puree. This process requires freezing technology such as an air blast freezer machine. The evaporator fan functions to prevent blocking of the evaporator fins and distribute cold air so that the room temperature reaches -18˚C. This research aims to determine the effect of variations in evaporator fan rotation on the performance of the air blast freezer system. Data are taken every 10 minutes until the mango puree reaches the set point temperature. Three experiments were conducted with evaporator fan speeds set to low (1800 RPM), medium (2200 RPM), and high (2600 RPM). Based on the tests that have been carried out, the system performance at low fan rotation produces an actual Coefficient of Performance (COP) of 1.9 with an efficiency of 41% and electricity costs of IDR 462,900. Medium fan rotation produces an actual COP of 2.0 with an efficiency of 43% and electricity costs of IDR 469,380. High fan rotation produces an actual COP of 2.1 with an efficiency of 45%. This research shows how variations in fan speed affect the COP, system efficiency, and operational costs, therefore the results of this research contribute to the development of energy efficient and economical cooling technology, especially for tropical-based food preservation applications such as fruit puree mango.
Application of Anthropometric Data on Redesign of Lightweight Brick-Cutting Tools to Reduce Workers' Musculoskeletal Complaints I Gede Bawa Susana; I Made Suartika; Gilang Ade Putra
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.72-77

Abstract

The work of cutting lightweight bricks manually with the help of cutting tools still leaves problems. Unnatural working postures are a form of problems faced by workers. This causes musculoskeletal complaints that have an impact on comfort at work. To overcome this, a redesign of the lightweight brick-cutting tool was carried out using worker anthropometric data. The redesign was carried out on the pedal switch and work chair because this caused complaints from workers. The results of the redesign reduced the musculoskeletal complaints of workers who did lightweight brick-cutting work by an average of 49.36%. This figure was obtained from measurements after working on the old and new tools. The decrease occurred from an average of 62.8 when using the old tool to 31.8 after the intervention. The study results can be used as a guideline for workers doing manual work to create a comfortable and sustainable working atmosphere.

Page 11 of 18 | Total Record : 171

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