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Gas Pipeline Hydrodynamic Analysis Based on Beggs-Brill Correlation Astyanto, Achilleus Hermawan
Media Teknika Vol 11, No 2 (2016)
Publisher : Sanata Dharma University

A reliable pipeline design requires hydrodynamic analysis. The analysis enables flow rate and pressure gradient investigations in obtaining an optimum configuration. In the other hand, a numerical approach occurs as a complex schematic is proposed. Solving this requirement, an iterative method is posible to be endorsed. This study aims to investigate single-phase gas pipeline hydrodynamic analysis. A model utilized a two-phase pressure gradient correlation, namely Beggs-Brill correlation, to converse single-phase gas pressure gradients into mass flow rates. Furthermore, the numerical method, called Newton-Raphson, is assesed on solving those iterative calculations. The results show that the model is able to solve a complex schematic. The mass flow rates obtain in the deviation up to 0.4 %, whereas the pressure gradients deviation is achieved on a higher value.Â

A STUDY OF STATICS ON DRIYARKARA ELECTRIC AUTOMOBILE CHASSIS PROTOTYPE Astyanto, Achilleus Hermawan; Yanto, Yana Resti; Adi, Adolf Baskoro Wisnu
International Journal of Applied Sciences and Smart Technologies Volume 02, Issue 01, Juni 2020
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v2i1.1933

A design phase commonly initiates either a product invention or development. Before it continues to the fabrication steps, a modern computational, enabling a simulation study during the phase, often gives opportunity to develop its effectiveness and efficiency. Through several boundary conditions, some analytical and/or computational approaches could be determined. This paper aims to elaborate both static simulations and simple experimental tests on an electric automobile chassis prototype. An application based on finite element analysis was assessed to carry out both von Misses stresses and the nodal displacements regarding the construction and/or material strength to a static loads mode. Furthermore, an experimental based examination was also executed as a simple physical validation. The studies emphasize accepted results on von Misses stresses and nodal displacements for both simulation and experimental approaches.Keywords: Chassis Statics, von Misses stresses, nodal displacements, finite element

Pengaruh Rasio I/D terhadap Permulaan Flooding dan Fluktuasi Voltase Sinyal Tekanan Rezim Flooding pada Geometri Kompleks Astyanto, Achilleus Hermawan; Rahman, Yusuf; Medha, Akbar Yuga Adhikara; Deendarlianto, Deendarlianto; Indarto, Indarto
Jurnal Rekayasa Mesin Vol 12, No 2 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.02.21

A nuclear power plant operation requires reliability safety systems. Therefore, an accidental scenario such as the LOCA becomes a specific attention. This relates to a countercurrent flow phenomenon which permits the occurrence of a flooding regime. This study aims to investigate the effets of I/D ratios of the riser on the onset of flooding and time-series voltage fluctuations of differential pressure signals of the flooding regime on a complex geometry representing a PWR hot leg. The test section contains a combination of a horizontal, an elbow and an inclined pipes. Three I/D ratios containing 1.9 (R1), 3.9 (R2) and 8.3 (R3) were assesed. The tabulated data are expressed in the term of a flooding curve. Meanwhile, the statistical features of the time-series voltage fluctuations of the signals are presented on both PDF and PSD graphs. The results obtained show that the assesed I/D ratios do not conduct significance effects on the onset of flooding. On the other hand, there are trends which can be obtained from the time-series signals with the increase of the I/D ratio. Those trends can also be observed in the such statistical features; the PDF and PSD graphs, respectively.

Gas Pipeline Hydrodynamic Analysis Based on Beggs-Brill Correlation Achilleus Hermawan Astyanto
Media Teknika Vol 11, No 2 (2016)
Publisher : Sanata Dharma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/mt.v11i2.291

A reliable pipeline design requires hydrodynamic analysis. The analysis enables flow rate and pressure gradient investigations in obtaining an optimum configuration. In the other hand, a numerical approach occurs as a complex schematic is proposed. Solving this requirement, an iterative method is posible to be endorsed. This study aims to investigate single-phase gas pipeline hydrodynamic analysis. A model utilized a two-phase pressure gradient correlation, namely Beggs-Brill correlation, to converse single-phase gas pressure gradients into mass flow rates. Furthermore, the numerical method, called Newton-Raphson, is assesed on solving those iterative calculations. The results show that the model is able to solve a complex schematic. The mass flow rates obtain in the deviation up to 0.4 %, whereas the pressure gradients deviation is achieved on a higher value.

A Study of Statics on Driyarkara Electric Automobile Chassis Prototype Achilleus Hermawan Astyanto; Yana Resti Yanto; Adolf Baskoro Wisnu Adi
International Journal of Applied Sciences and Smart Technologies Volume 02, Issue 01, June 2020
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v2i1.1933

A design phase commonly initiates either a product invention or development. Before it continues to the fabrication steps, a modern computational, enabling a simulation study during the phase, often gives opportunity to develop its effectiveness and efficiency. Through several boundary conditions, some analytical and/or computational approaches could be determined. This paper aims to elaborate both static simulations and simple experimental tests on an electric automobile chassis prototype. An application based on finite element analysis was assessed to carry out both von Misses stresses and the nodal displacements regarding the construction and/or material strength to a static loads mode. Furthermore, an experimental based examination was also executed as a simple physical validation. The studies emphasize accepted results on von Misses stresses and nodal displacements for both simulation and experimental approaches.Keywords: Chassis Statics, von Misses stresses, nodal displacements, finite element

TELAAH STATISTIK PARTISIPASI ALUMNI DALAM PEMBENTUKAN KEPENGURUSAN KELUARGA ALUMNI MESIN SANATA DHARMA Achilleus Hermawan Astyanto; Yulia Venti Yoanita
Jurnal Berdaya Mandiri Vol. 4 No. 2 (2022): JURNAL BERDAYA MANDIRI (JBM)
Publisher : Universitas PGRI Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31316/jbm.v4i2.2480

The alumni gathering for the 25th years Mechanical Engineering of Sanata Dharma triggered the participants to initiate a forum to build communication, synergy and collaboration between alumni and the alma mater as well as informally started the alumni national network. However, four years have passed, the board of management has not been definitively realized. As a result, the initiators still carry out their mandate as ad interim board. This situation is not ideal. As a reflection and evaluation, a regeneration needs to be further conducted to strengthen the collaboration. This paper describes the participation rate of alumni in the formation of the board of management for 2022-2025 period. The result shows that the participation rate increases as the stages ware carried out. In addition, the figure gaining the majority establishes the support.

A Brief on Optical-based Investigation towards The Interfacial Behaviors during High Viscous Liquid/Gas Countercurrent Two-Phase Flow in a Complex Conduit Representing 1/30 Down-Scaled of PWR Hot Leg Geometry Achilleus Hermawan Astyanto; Indarto Indarto; Deendarlianto Deendarlianto
International Journal of Applied Sciences and Smart Technologies Volume 05, Issue 01, June 2023
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v5i1.6302

The present work briefly investigates liquid/gas countercurrent two-phase flow phenomena which can be specifically found in a mitigation during an accidental scenario in the operation of a nuclear reactor. A comprehensive knowledge on the corresponding phenomena is obviously important to avoid the failure on the cooling mechanism. Here, a pair of fluid containing high viscous liquid/gas flows through a complex conduit representing 1/30 scaled-down of PWR hot leg’s typical geometry. Furthermore, the flow structures were visually observed, while the film thicknesses are extracted by an image processing algorithm through the corresponding optical-tabulated data. The obtained results reveal that a rather sharp decrease in liquid film corresponds to the flow regime transition.Keywords: Countercurrent two-phase flow, liquid film thickness, high viscous liquid, complex conduit

IMPLEMENTASI STOKASTIK PADA INVESTIGASI PENGARUH I/D TERHADAP PERILAKU ANTARMUKA ALIRAN BERLAWANAN ARAH DI GEOMETRI 1/30 HOT LEG PWR MENGGUNAKAN SENSOR KONDUKTANSI Astyanto, Achilleus Hermawan; Rasyidi, Muchsin Muzafar; Nugroho, Akhlisa Nadiantya Aji; Ikhsan, Alfikri; Saleh, Dede Rafico
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1531

A small leakage in the primary circuit of a nuclear power plant reactor may trigger the occurrence of countercurrent flow which probably develops into a flooding regime followed by the zero penetration caused core cooling failure. During extensive studies in the flooding phenomena in the PWR hot leg, the geometry effects have been widely investigated. The present study investigates the effects of I/D ratios of the riser on the interfacial fluctuations during the counter-current flow on a 1/30 scaled down PWR hot leg geometry. Here, the liquid film fluctuations were acquired by using parallel wire array probes on the basis of a conductance concept. Three I/D ratios which were varied consisted 1.9 (R1), 3.9 (R2) and 8.3 (R3). The obtained data were analyzed on the basis of both time and frequency domains. From the PDF the flooding regime obtains multimodal distributions, while the PSD approaches lower frequencies with higher magnitudes corresponding to either the occurrence of water blockage or slugs. Keywords: I/D ratio, water level fluctuation, counter-current flow, PWR hot leg, parallel wire array probe, stochastic analysis.

KEGIATAN TEMU SEDULUR DAN SYAWALAN KAMESADHA: KUANTIFIKASI STATISTIK GAGASAN ALUMNI Astyanto, Achilleus Hermawan; Yoanita, Yulia Venti
ABDIMAS ALTRUIS: Jurnal Pengabdian Kepada Masyarakat Vol 6, No 2 (2023): Oktober 2023
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/aa.v6i2.6213

The management of the board of KAMESADHA for the 2021–2024 period was definitively established during a mechanism of general election. In a particular mission, the board should enhance the communication, synergy, and collaboration among the stakeholders, i.e. alumni and the university. The present work elaborates a statistical quantification on the ideas of the members of KAMESADHA regarding how important the alumni gathering is. A typical result reveals an annual gathering concerning the corresponding synergy is suggested.

Bubble flow configurations generated by ejector type bubble generator Catrawedarma, I Gusti Ngurah Bagus; Ton, Sefri; Pranowo, Dadang Dwi; Surahmanto, Fredy; Astyanto, Achilleus Hermawan
International Journal of Applied Sciences and Smart Technologies Volume 07, Issue 1, June 2025
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v7i1.10816

Bubble flow configurations generated by an ejector bubble generator were captured using a high-speed video camera and extracted into several images. The air flow and nozzle diameter were varied during the test in ranges of 0.1-1.5 lpm and 1.17-3.5 mm, respectively. The results reveal that in general the bubble flow structure coming out from the bubble generator is divided into three regions, namely the entrance, bubble swarm, and bubble dispersed region. It is found that there is a higher time delay of bubble production when the air flow and the nozzle diameter decrease. On the other hand, the bubble production time is longer, if the air flow and the nozzle diameter increase.

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