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All Journal Jurnal Ilmiah Teknologi dan Rekayasa INDONESIAN JOURNAL OF APPLIED PHYSICS
Haris Rudianto
Gunadarma University
Astronomy Automotive Engineering Computer Science & IT Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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DESIGN AND SIMULATION OF PLASTIC INJECTION MACHINE FOR PET (POLYETHYLENE TEREPHTHALATE) Adhiyoga Mudjoko; Haris Rudianto
Jurnal Ilmiah Teknologi dan Rekayasa Vol 28, No 1 (2023)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2023.v28i1.8564

Abstract

PET (Polyethylene Terephthalate) material is widely used for several industries, especially the electronics industry. This study conducted a design and simulation for the manufacture of cases for smartphones using plastic injection machines for the manufacturing process. On the simulation results, it is found that the filling process, temperature and pressure have similarities, namely the distribution starting from the filling center point to the end of the casing design. Defects in manufacturing results are one of the failures of the production process and in this study, it is very rare to find research results that analyze predictions of defects in the smartphone case manufacturing process. On this simulation, defects were able to be detected in the simulation results of the casing design such as line defects and defects due to air bubbles. This research has succeeded in making an overview of the filling process, temperature, pressure, and early detection of defects in the injection process.
Study of First Principles of Mg-Si Binary Systems as Precipitates from T6 Heat Treatment of AL-MG-SI ALLOYS Deni Haryadi; Haris Rudianto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (690.64 KB) | DOI: 10.13057/ijap.v10i01.28912

Abstract

One of the purposes adding the two main alloying elements Si and Mg in small quantities (≈ 1%) on Aluminum is to form strengthening precipitates in aluminium alloy, which typically contribute with a fivefold strength increase from pure aluminum. In the last decades, the investigation has begun to understand the structure and formation of the different phases during heat treatment. An important precipitate in Al-Mg-Si Alloy is β" and β.  when the Precipitate β is created after β" is that the strength suddenly drops and the alloy is said to be overaged. By means of a first-principles supercell approach and density functional theory calculations, this research studied precipitate energy and interface energy of precipitate β" and β. Results show that precipitate β have precipitate energy higher then β" but have interface energy lowers then β". And each low energy interface was found possesses interface with the Al matrix is fully incoherent. The final result of calculation and simulation values for the interfacial energies, precipitate energies and strain energies that can be used in future predictions of the characteristic precipitate.
Design and performance evaluation of a solar-powered electrical system for shrimp pond aerators Walker Joseph; Rudi Nur Jaya; Irdandi; Haris Rudianto
Jurnal Ilmiah Teknologi dan Rekayasa Vol. 31 No. 2 (2026)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2026.v31i2.186

Abstract

This study presents the design and performance evaluation of a solar-powered electrical system for shrimp pond aerators. The system was developed to provide a reliable off-grid energy solution by considering electrical load requirements, photovoltaic performance, and energy storage configuration. A 300 Wp photovoltaic panel, battery-based energy storage, and a DC motor aerator with a rated power of 250 W were utilized in the proposed system. Experimental testing was conducted under Standard Test Conditions (STC) and normal operating conditions through field measurements at Setu Hambaro, Cileungsi, Bogor. The results show that the photovoltaic system delivered an effective output power of approximately 281 W under normal operating conditions, providing a safety margin of around 12% above the aerator power requirement. The measured system efficiency ranged from 9.84% under STC to 11.58% under normal field conditions, reflecting typical efficiency variations caused by environmental factors and system- level losses. The findings indicate that the proposed electrical system design is capable of maintaining stable aerator operation without abrupt power fluctuations. Despite reduced efficiency compared to nominal photovoltaic module ratings, the system performance remains within acceptable limits for standalone photovoltaic applications. Overall, the results confirm that the proposed solar-powered electrical system is technically feasible and suitable for shrimp pond aerator applications in areas with limited access to grid electricity.
Co-Authors Adhiyoga Mudjoko Haryadi, Deni Irdandi Rudi Nur Jaya Walker Joseph