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All Journal Proceeding of the Electrical Engineering Computer Science and Informatics Jurnal Taman Vokasi Jurnal Ilmiah Teknik Mesin Poros Cylinder : Jurnal Ilmiah Teknik Mesin
Anthon de Fretes, Anthon de Fretes
Universitas Katolik Indonesia Atma Jaya
Automotive Engineering Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis on the Cogging Torque of Permanent Magnet Machine for Wind Power Applications Tajuddin Nur; Linda Wijayanti; Anthon de Fretes; Karel Octavianus Bachri
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 7, No 1: EECSI 2020
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eecsi.v7.2082

Abstract

This paper discusses the new feature implemented in most social media messaging applications: the unsent feature, where the sender can delete the message he sent both in the sender and the recipient devices. This new feature poses a new challenge in mobile forensic, as it could potentially delete sent messages that can be used as evidence without the means to retrieve it. This paper aims to analyze how well Autopsy open-source mobile forensics tools in extracting and identifying the deleted messages, both that are sent or received. The device used in this paper is a Redmi Xiaomi Note 4, which has its userdata block extracted using linux command, and the application we’re using is WhatsApp. Autopsy will analyze the extracted image and see what information can be extracted from the unsent messages. From the result of our experiment, Autopsy is capable of obtaining substantial information, but due to how each vendor and mobile OS store files and databases differently, only WhatsApp data can be extracted from the device. And based on the WhatsApp data analysis, Autopsy is not capable of retrieving the deleted messages. However it can detect the traces of deleted data that is sent from the device. And using sqlite3 database browser, the author can find remnants of received deleted messages from the extracted files by Autopsy.
Pengaruh Variasi Geometri Sudu Impeler Radial Semi Terbuka Terhadap Efisiensi Mini Pompa Sentrifugal: Pengaruh Variasi Geometri Sudu Impeler Radial Semi Terbuka Terhadap Efisiensi Mini Pompa Sentrifugal Zainuri Anwar; Hadi Sutanto; Anthon De Fretes; Sandra Octaviani
Jurnal Taman Vokasi Vol 11 No 2 (2023): In Press
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/jtvok.v11i2.16258

Abstract

Salah satu yang mempengruhi peningkatan efisiensi pompa adalah geometri sudu impeler. Tujuan dari penelitian ini adalah untuk mendapatkan desain geometri impeler terbaik pada mini pompa sentrifugal. Geometri impeler yang digunakan dalam penelitian ini memiliki tiga variasi yaitu: tipe impeller radial miring, radial melengkung, dan radial airfoil. Sudu impeler didesain selanjutnya dibuat mengunakan mesin 3D print dengan bahan filamen PLA. Motor penggerak pompa yang digunakan adalah dinamo 775 DC 12Volt dengan kecepatan putaran pompa diatur menggunakan potensio pada 2000 rpm, 2150 rpm, 2300 rpm, 2450 rpm, 2600 rpm, dan 2700 rpm. Hasil pengujian menunjukkan bahwa perbedaan geometri sudu impeler mempengarui efesiensi mini pompa sentrifugal. Efisiensi tertinggi terjadi pada tipe impeler radial melengkung dengan nilai efesiensi mencapai 19,35% pada putaran 2700 rpm. Kondisi ini lebih baik daripada tipe impeler lainnya dengan trend kenaikan efesiensi meningkat seiring dengan peningkatan putaran pompa.
ANALISIS ALIRAN PADA BUCKET TURBIN PELTON 1 KW DENGAN VARIASI SPEAR NOZZLE MENGGUNAKAN METODE CFD Darmawan, Steven; Sutanto, Hadi; De Fretes, Anthon; Octaviani, Sandra; Tanujaya, Harto; Rosehan, Rosehan; Marcellio, Ricco
POROS Vol. 19 No. 1 (2023): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/poros.v19i1.25627

Abstract

Pelton turbine have been used for harvesting renewable energy by extracting kineticenergy of water into mechanical energy for more than 100 years. This characteristic makes thissystem remains potential to achieve Goals #12 SDGs. During the operation, the performance ofPelton Turbine is affected by several parameters: hydraulic power, water flow rate, bucketdesign, and nozzle. Among others, nozzle design is the most challenging since this part isresponsible to drive the water direction strike the buckets, converting impulse. The performanceof existing 1 kW Pelton Turbine equipped with 15mm Spear Nozzle is believed can be improvedby varying the nozzle diameter by using low-cost CFD simulation procedure. Ansys Fluent fromAnsys Student 2021 R1 is used in this research. Represented by two-buckets facing spear nozzle,three dimensional CFD simulation is conducted. The nozzle diameter is varied to 15 mm, 14 mm,and 13 mm from two configurations. The first and second configuration is done with water flowrate 3,3 kg/s and 1,3 kg/s respectively. The results show that 15 mm nozzle diameter can producehigher power as high as 594,08 Watt with the first configuration. Even though at the secondconfiguration this 15mm nozzle diameter did not produce the highest power, other parameterssuch as splashing water and erosion effect still show that the 15mm nozzle diameter performedbetter than others. This simulation results also consistent with experimental results whichperformed by using first configuration and 15mm nozzle diameter. The results also show that thesistem performance is much higher at higher water flow rates. Therefore, the development of thesystem can be continued to by using spear nozzle with diameter higher than 15mm.
Friction Stir Welding pada Paduan Aluminium 6061 dan HDPE menggunakan Mesin Frais Basuki, Widodo Widjaja; Ginting, Eliata Dumar; Hudaya, Hoo Bram Natanael; Sutanto, Hadi; De Fretes, Anthon; Widiarto, Sandra Octaviani B.
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 10 No 1 (2024): APRIL 2024
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v10i1.5497

Abstract

Friction stir welding (FSW) is a solid-state welding method that is very simple, cheap, and in principle only requires equipment to rotate the tool and move the workpiece translationally. In this research, it was demonstrated that the FSW process of aluminum alloy 6061 and high-density polyethylene (HDPE) polymer is possible using a vertical milling machine, however, modifications need to be made to make it possible to regulate the pressure applied by the milling machine through the tool shoulder to the surface of the workpiece. Apart from that, it was also known that for each material undergoing the FSW process, it is necessary to determine the right parameter set which is a combination of rotational speed and tool feed speed to obtain optimal welding results. Too high a tool rotation speed can cause high lifting forces which can produce large porosity in the workpiece. For the HDPE FSW process, too high a tool rotation speed, which is not balanced with the increase in feed speed will provide excessive heat, causing depressions on the surface of the nugget zone.
Co-Authors Alfando Alfando Bachri, Karel Octavianus Basuki, Widodo Widjaja Christiand Christiand Fransiskus Albert Ginting, Eliata Dumar Hadi Sutanto Hadi Sutanto Harto Tanujaya Hudaya, Hoo Bram Natanael Marcellio, Ricco Obed Tetriscio Torar Purnomo Sejati Randy Randy Rosehan Rosehan, Rosehan Sandra Octaviani Sandra Octaviani Sheila Tobing Steven Darmawan, Steven Tajuddin Nur Thomas Simajaya Widiarto, Sandra Octaviani B. Wijayanti, Linda Yohanes Agus Nugrahanto Zainuri Anwar