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All Journal Rekayasa Mesin International Journal of Education, Science, Technology, and Engineering (IJESTE) Indonesian Journal of Computing, Engineering, and Design Jurnal Abdimas Bina Bangsa Journal of Materials Exploration and Findings Jurnal Pemberdayaan Masyarakat Jurnal Rekayasa elektrika Jurnal Pengabdian Masyarakat Charitas Cylinder : Jurnal Ilmiah Teknik Mesin
Tobing, Sheila
Faculty Of Engineering, University Of Indonesia, UI Depok Campus, Depok 16424, Indonesia
Arts Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Evaluation of Kinetic Mechanism for Modelling Dimethyl Ether Jet Diffusion Flame Ahmad Syihan Auzani; Sheila Tobing; Ridhwan Sunandar; Riesta Anggarani; Cahyo Setyo Wibowo; Dedi Sutarma
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 4 No. 2 (2022): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v4i2.298

Abstract

Many countries use liquefied petroleum gas (LPG) for various purposes, such as cooking and heating. As the population and the need for energy grow, demand for LPG steadily increases. This situation causes the rise in LPG imports for countries with an insufficient local supply, including Indonesia. To overcome this problem, the Indonesian Government plans to substitute LPG fuel with dimethyl ether (DME). However, stoves and household burners widely used in Indonesia are designed for LPG. Thus it is necessary to study the fuel flexibility of the burners. Many experimental studies on the substitution of LPG with DME are reported in the literature, but few models have been developed to simulate it. This paper aims to evaluate the performance of reaction mechanisms developed to model DME diffusion flames with various burner temperatures ranging from 300 to 1500 K. It was found that existing models could simulate the chemical structure of the flame but could not predict the formation of enthalpy of combustion reactions.
EFFECTS OF CROSSWIND ON THE DRAG OF MEDIUM SPEED TRAINS David Prayoga Paramaputera; Sheila Tobing; Matza Gusto Andika
Jurnal Rekayasa Mesin Vol. 13 No. 2 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i2.1011

Abstract

Aerodynamic research on medium-speed trains is trying to map the flow of fluid around trains. The train model testing is conducted to study Cd values experimentally using a closed-loop wind tunnel at the Balai Besar Teknologi Aerodinamika, Aeroelastika, dan Aeroakustika. In addition to the experimental method, the computational method can be used to validate the experimental results, map the fluid flow around the train model, and calculate Cd values. The computational results of Cd obtained using ANSYS are compared against Cd values from wind tunnel tests. Further analysis using the ANSYS program with variations in the yaw angle can predict crosswind effects on the train model. It is found that vortices are formed around the train body, and modifying the head shape and adding fairing increases Cd values.
Rancang Bangun Mesin Penggiling Cabai Fernaldy Tandijo; Sheila Tobing
Cylinder : Jurnal Ilmiah Teknik Mesin Vol. 7 No. 1 (2021): APRIL 2021
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

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Abstract

Cabai merupakan salah satu jenis rempah yang sangat diminati oleh masyarakat Indonesia, sehingga permintaan untuk cabai sangatlah tinggi. Maka dari itu diperlukan suatu alat untuk membantu memenuhi permintaan tersebut, yang dalam penelitian ini yaitu alat penggiling cabai otomatis. Alat penggiling ini akan diberikan kepada mitra UKM di daerah Kelapa Gading (Jakarta) yang memiliki kebutuhan untuk memproduksi cabai giling dengan kapasitas 100 kg/jam. Mesin penggiling menggunakan motor AC untuk memberikan daya putar pada pisau yang sudah terhubung dengan poros sehingga cabai dapat secara otomatis digiling oleh putaran pisau tersebut. Penggilingan cabai yang sebelumnya dilakukan secara manual oleh UKM dapat diubah menjadi otomatis sehingga dapat mencapai kapasitas 61 kg/jam. Tidak tercapainya target 100 kg/jam disebabkan oleh dua hal, yaitu proses pemasukan cabai segar secara manual ke dalam ruang penggilingan serta terlalu kecilnya ukuran wadah penampungan cabai segar.
OPTIMASI PROSES BUBUT DENGAN MENGGUNAKAN METODE TAGUCHI DAN TAYLOR UNTUK MENENTUKAN KEKASARAN PERMUKAAN DAN UMUR PAHAT KARBIDA Alfando; Sheila Tobing; Anthon de Fretes
Cylinder : Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2017): OKTOBER 2017
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

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Abstract

Gesekan antara pahat dengan benda kerja akan menimbulkan panas yang tinggi sehingga menyebabkan terjadinya keausan pahat. Hal ini berdampak pada pembentukan kekasaran permukaan yang semakin tinggi dan umur pahat yang semakin pendek sehingga mengakibatkan kualitas produk akan semakin rendah. Selain dipengaruhi oleh ketahanan pahat terhadap aus, kualitas permukaan benda kerja juga dipengaruhi oleh pengaturan parameter pemesinan, seperti kecepatan potong, gerak makan, dan kedalaman potong. Parameter-parameter diatas dapat mempengaruhi kekasaran permukaan maupun umur pahat. Dalam penelitian ini, untuk mengetahui parameter yang paling mempengaruhi dalam kekasaran permukaan digunakan metode Taguchi, sedangkan untuk mendapatkan umur pahat digunakan metode Taylor. Pada penelitian ini, pahat yang digunakan adalah pahat karbida dengan benda kerja besi cor kelabu. Hasil yang didapatkan untuk batas keausan VB pada pahat karbida dengan besi cor kelabu selama penelitian adalah 0,44 mm. Selain itu, hasil yang didapat setelah melakukan penelitian dengan metode Taguchi yaitu faktor gerak makan memiliki pengaruh paling besar dalam kekasaran suatu permukaan, kemudian disusul faktor kecepatan potong dan faktor kedalaman makan. Maka, untuk umur pahat karbida dengan benda kerja besi cor kelabu memiliki persamaan umur pahat Taylor adalah vT0,397=72,7846.
Optimasi Sudut Die, Rasio Reduksi, dan Panjang Bearing terhadap Tegangan Penarikan Kawat Aluminium dengan Finite Element Method Alfian Wijaya; Sheila Tobing; Hadi Sutanto
Cylinder : Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2017): OKTOBER 2017
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

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Abstract

Dalam proses penarikan kawat, geometri die menjadi salah satu faktor yang mempengaruhi hasil dari proses penarikan. Dalam Tugas Akhir ini variasi sudut die, rasio reduksi, dan panjang bearing menjadi kasus yang akan diuji. Tujuan dari penelitian tugas akhir ini adalah melakukan analisis teoritis dan simulasi untuk menemukan pengaruh variasi geometri die pada tegangan penarikan kawat dengan metode Uniform-Deformation Energy Method dan finite element method. Material yang digunakan adalah aluminium-3003. ANSYS-WORKBENCH v18.2 digunakan untuk melakukan proses simulasi. Kawat ditarik pada rasio reduksi 0,1; 0,15; 0,2; 2,5; dan 0,3 dengan sudut die 6o, 8o, 8.5o, 9o, 9.5o, 10o, 15o. Panjang bearing yang diuji adalah 0,6 mm, 0,8 mm, 1 mm, 1,2 mm, 1,4 mm. Hasil dari percobaan menunjukkan sudut optimum pada aluminium-3003 untuk rasio reduksi 0,1; 0,15; 0,2; 0,25; dan 0,3 adalah 8o, 8,5o, 10o, 10o, 15o sesuai dengan urutan.
Declining Cogging Torque Technique of an Integral Slot Number for Permanent Magnet Machines Herlina Herlina; Tajuddin Nur; Maria Angela Kartawidjaja; Linda Wijayanti; Kumala Indriati; Sheila Tobing
Jurnal Rekayasa Elektrika Vol 19, No 4 (2023)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v19i4.30028

Abstract

The existence of cogging torque in electric equipment has been considered undesirable. This kind of friction in the air-gap impacts the alignment of flux and the stator slots, resulting in the observed outcome. Consequently, the imposition of restrictions on the rotation of the rotor is employed to generate electrical energy. This research endeavor primarily aims to mitigate the cogging torque of electrical machinery. The current utilization involves employing a total of 3 permanent magnet synchronous machines, often known as inset PMMs, which possess a slot count of 24 and a pole count of 8. The employed technique involves the integration of an optimal pole arc method in conjunction with the implementation of slots cut into the magnet's edge. The machine model under investigation has two fundamental variants, namely Models 1 and 2. These models are equipped with 1one-step slotted (OSS) and 2two-step slotted (TSS) edges on each magnet, in addition to pole arc optimization. The simulation was conducted using the Finite Element Method Magnetics (FEMM) 4.2 software together with LUA scripts, with a focus on rotor rotation ranges of 1 degree. Model 2 exhibited a decrease in cogging torque of 0.01 Nm, whereas Model 1 demonstrated a reduction of 0.015 Nm, and the basic model had a decrease of 0.02 Nm. When implementing a dual-layered cutting edge on a magnet and attempting to optimize its pole arc, it is imperative to consider that the cogging torque's peak magnitude becomes substantially diminished or entirely eliminated.
PEMODELAN SISTEM DINAMIK DAN IMPLEMENTASI SIMULINK PENGENDALIAN KESTABILAN UNMANNED AERIAL VEHICLE MULTIROTOR HEXACOPTER CARGO Soputra, Steven Wiliam; Tobing, Sheila; Rawikara, Seno Sahisnu
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1032

Abstract

The rapid growth of Unmanned Aerial Vehicle (UAV) technology, or drone, has shown its popularity and has been significantly applied to various purposes today. Nevertheless, with all the sophistication of drones, many related topics are still attractive, especially when a drone is designed to carry out a cargo mission. Thus, in this research, the dynamic model of a Hexacopter drone to deliver goods belongs to PT Aero Terra Scan is being developed. This dynamic modeling aims to further the drone's development by modeling it in 2 cases: no-payload and with a payload of 5 kg cases. The dynamic model of this Hexacopter is based on flight dynamics, a field of science studied in Aeronautical Engineering, and is implemented using Simulink. Through the results of this research, several conclusions have been withdrawn: (1) The drone's unstable nature characteristic inherently, even though it is analyzed from the initial hover condition. Thus, the drone and its system as a whole can never be separated with the feedback control that made it can maneuver adequately. (2) Several technical parameters of this Hexacopter, including the geometry, mass, the moment of inertia, until the estimation of motor throttle is required to achieve its hover conditions, both in the no-payload case and with-payload of 5 kg case.  (3) The Hexacopter basic dynamic system model is based on the flight dynamics until its motion system control tuning through root locus map analysis using Simulink.
RANCANG BANGUN ALAT PENGUPAS KULIT BAWANG UNTUK PANTI ASUHAN BHAKTI KASIH BOGOR TOBING, SHEILA
Jurnal Pengabdian Masyarakat Charitas Vol. 1 No. 2 (2021): Jurnal Pengabdian Masyarakat Charitas Desember 2021
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/charitas.v1i2.2872

Abstract

Red onions and garlics are one of the most usual spices that is used in Indonesian food. One of the content inside the onions is sulfur, which can react chemically and form sulfenic acid. Sulfenic acid is one of the chemical compound which can cause sore to redness on human’s eyes. Production process that include pre-harvest to post-harvest requires support of effective facilities, suitable equipment and agricultural machinery so that productivity could be increased. Red onions and garlics peeling in mass number will cost a lot of time and can cause irritation on human’s eyes. Therefore, an onion peeler which can peel a lot of red onions and garlics without human intervention is needed to increase productivity. Bhakti Kasih Orphanage at Bogor provides a home for 55 children from around Indonesia such as Papua, Ambon, Nias, Jakarta and even Timor Leste. Furthermore, there are also 4 caretakers and 7 alumni from Bhakti Kasih Orphanage living with them. Foods that are provided there often use red onions and garlic as base spices, which usually takes 20 minutes per kilogram garlics or red onions to peel the skin off.
Analisis Pengaruh Modifikasi Pressure Reducing Valve Terhadap Range Pressure Drop Aliran Uap Anwar, Kelly; Gunawan, Harjadi; Tobing, Sheila
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.v10i1.5483

Abstract

Pressure Reducing Valve (PRV) is a control valve designed to reduce upstream pressure to downstream pressure on fluid flow. When operating, a PRV is in an equilibrium condition because of the forces acting on it, such as fluid resultant force, membrane force, and spring force. On some working conditions, a PRV cannot operate because the equilibrium is unattainable by the spring that deflects further than the maximum allowable limit and unable to produce force balancing out other forces. Therefore, a modification on the spring wire diameter from 17 mm to 20 mm is conducted without altering other PRV parts dimension and geometry. The modified spring will be analysed through analytical analysis and simulation analysis with Ansys software. On the same working conditions with the enlargement of the spring wire diameter, the deflection that once was 99,28 mm decreases to 42,64 mm and does not exceed the maximum limit at 74,375 mm so the PRV can operate on said condition and the pressure drop range increases from 7 bar to 9 bar.
Techno-Economic Analysis of Floating Solar PV on Reservoir Ash Pond in Coal-Fired Power Plants Warto; Tobing, Sheila
International Journal of Education, Science, Technology, and Engineering (IJESTE) Vol 7 No 2: December 2024
Publisher : Lamintang Education and Training Centre, in collaboration with the International Association of Educators, Scientists, Technologists, and Engineers (IA-ESTE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36079/lamintang.ijeste-0702.789

Abstract

The increasing global energy demand drives the development of efficient and sustainable renewable energy solutions. Floating Solar PV (FSPV) technology offers a viable solution by utilizing water surfaces such as reservoir ash ponds in coal-fired power plants without requiring additional land. This study aims to analyze the technical and economic aspects of an FSPV system with a capacity of 15.2 kWp using HelioScope and Homer Pro software, assuming Global Horizontal Irradiance (GHI) data from the National Solar Radiation Database. The analysis methods include annual energy production, Net Present Cost (NPC), Levelized Cost of Energy (LCOE), and other economic metrics such as Return on Investment (ROI), Internal Rate of Return (IRR), and Simple Payback Period for various grid electricity price escalation scenarios. The results show that a 5% annual increase in grid electricity prices reduces the simple payback period from 18.2 years to 13 years, with an ROI increase to 6.3% and an IRR of 7.1%. This study concludes that the FSPV system not only supports the transition to clean energy but also offers greater financial benefits under scenarios of rising grid electricity prices.
Co-Authors Ahmad, Hafidlotul Fatimah Alfando Alfian Wijaya Andrew Schauf Anthon de Fretes Anwar, Kelly Arka Dwinanda Soewono Auzani, Ahmad Syihan Auzi Asfarian Cahyo Setyo Wibowo David Prayoga Paramaputera Dedi Sutarma Emir Raya Syuhada Febri, Zamharir Aditya Fernaldy Tandijo Gabriella Lumban Siantar Hadi Sutanto Hardhienata, Medria Kusuma Dewi Harjadi Gunawan Herlina Herlina Iffa Mutmainah Indianto, Mohammad Akita Irma Suryanti Kumala Indriati Linda Wijayanti Maria Angela Kartawidjaja Marten Darmawan Matza Gusto Andika Nahak, Demetrio Pote, Juan William Priatama, Ananda Prita Dewi Basoeki Putraandari, Fauzan Rawikara, Seno Sahisnu Ridhwan Sunandar Riesta Anggarani Sita Rahmani Soputra, Steven Wiliam Syaefudin Suminto Tajuddin Nur Takhta Pandu Padmanagara Warto Wulandari Wulandari