Sheila Tobing

University of Indonesia | UI

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...

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 dy...

The study of the aerodynamics of flapping airfoils is crucial to understand the flight of natural flyers and its potential applications in developing micro air vehicles and wind/water turbine blades. There has been much research on the aerodynamics of flapping wings recently, but there is only a little research relating to the tandem airfoil. There...

PT. Famindo Inovasi Teknologi (PT. FIT) is a company that works in the drone industry, and currently PT. FIT receives a request from Badan Keamanan Laut Republik Indonesia (BAKAMLA) to design a drone that can float on water. Therefore, my purpose is to design a fuselage of the maritime version from UAV V5 prototype produced by PT. FIT that have a l...

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...

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 t...

There have been many studies on the mechanisms of unsteady aerodynamics, such as leading-edge vortex (LEV) formation, wing-wake interaction, and spanwise flow. Spanwise flow can only be observed on three-dimensional wing models; however other phenomena such as LEV and wing-wake interaction can be captured using two-dimensional airfoil models. This...

LSU-05NG is a drone manufactured and developed by LAPAN. The horizontal tail of the aircraft is used to maintain longitudinal stability, however, there has been no study on a tail modification that could improve the performance. The study of tail modification will examine the impact of modifying the airfoil to NACA 2412 and NACA 63-215. The base mo...

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 require...

Kontes Mobil Hemat Energi (KMHE) merupakan kompetisi nasional yang diselenggarakan setiap tahun untuk menguji kemampuan merancang dan mengompetisikan kendaraan yang ramah lingkungan. Sejak tahun 2017, Universitas Katolik Indonesia Atma Jaya secara rutin mengikuti kompetisi ini melalui Workshop Mesin UNIKA Atma Jaya (WSM) pada kategori Urban. Peneli...

Kontes Mobil Hemat Energi (KMHE) merupakan lomba tingkat nasional yang diselenggarakan oleh Kementerian Riset dan Teknologi Indonesia yang bertujuan untuk mewadahi kreativitas mahasiswa seluruh Indonesia dalam merancang, membangun, menguji dan menyelenggarakan kompetisi mobil hemat energi yang aman dan ramah lingkungan. Peserta dari kegiatan ini ad...

This study is inspired by the flapping motion of natural flyers: insects. Many insects have two pairs of wings referred as tandem wings. Literature review indicates that the effects of tandem wing are influenced by parameters such as stagger (the stream-wise distance between the aerodynamic center of the front and the rear airfoil), angle-of-attack...

The corn kernel separator machine discussed in this paper is designed for our partner, a cow breeder in Cisarua, Bogor. Our partner currently has a corn kernel separator that can work at a capacity of 50 kg per hour, but the results of the separation of kernels by the machine are not clean and the open design of the separator makes the corn kernels...

Researches on car design are closely related to the field of aerodynamics. The design was done to minimize the drag force. The experimental method was only used for testing the initial design and the final design. Improvement and modification were done by using the CFD simulation. The experiments were done using the Low Speed Wind Tunnel (LSWT) own...

Bumblebees cannot fly! That conclusion is likely to be drawn by scientists who analysed the insect using aerodynamics of stationary wings such as that of a passenger aircraft. Looking at the insect again using a newfound understanding of unsteady aerodynamics; it is clear why bumblebees can fly. Bumblebees utilise mechanisms behind unsteady aerodyn...

The aerodynamic characteristics of model hoverflies during hovering flight are studied with a three-dimensional sharp-interface immersed boundary method. The wing is modelled as a rectangular generic wing to test the effects of an accessory flap called the alula, which is located at the wing root. Simulations are conducted in two groups: One group...

Since its commercialization as a mean of mass transportation, the design and development process of an aircraft mainly focus on increasing its speed and/or size. The shape of aircraft wing, which is the primary device for lift generation, has remained generally unchanged. A variety of wing configuration, tandem wing configuration, has been utilized...

In the past two decades, numerous studies on flapping wing motion have been conducted. These studies were inspired by the flapping motion of natural flyers: birds and insects. The flapping wing motion of natural flyers utilizes unsteady aerodynamic mechanisms such as leading-edge vortices (LEVs), spanwise flow and rapid rotation at end-of-stroke to...

Since its commercialization as a mean of mass transportation, the design and development process of an aircraft mainly focus on increasing its speed and/or size. The shape of aircraft wing, which is the primary device for lift generation, has remained generally unchanged. A variety of wing configuration, tandem wing configuration, has been utilized...

This study provides a comprehensive analysis of the effects of flexibility on bumblebee propulsion. The unusual stiffness distribution of bumblebee wings caused by the absence of veins on their outer one-third region is analyzed for the first time, with two flexible-wing models and one rigid-wing model tested in two-way Fluid-Structure Interactions...

Research on insect flight has been propelled by the growing interest in Micro Air Vehicles (MAVs). Typical flapping wing MAVs fly in the low Reynolds number regime of 103-104, similar to that of insects. A critical review on the progress of research on the effects of aerodynamics/kinematics and aeroelasticity on flapping wing propulsion reveals the...

The slide title is A Numerical Analysis of Bumblebee Propulsion. The presentation slide elaborates on the propulsion of rigid and flexible wings of bumblebees. The effects of flexibility on the aerodynamics and propulsion of bumblebees are numerically studied.

Interest in flapping wing propulsion has increased significantly in the past decade due to the potential applications in the design and development of micro air vehicles. In comparison to the wing kinematics, there has been relatively less attention given to the aeroelasticity of flapping wings. Recently, there have been some studies on the effects...

Interest in flapping wing propulsion has increased significantly in the past decade due to the potential applications in the design and development of micro air vehicles. In comparison to the wing kinematics, there has been relatively less attention given to the aeroelasticity of flapping wings. Recently, there have been some studies on the effects...

Characterised by low aspect ratio lifting/control surfaces and flight in the low Reynolds number regime, a typical micro air vehicle (MAV) generates complex flow phenomena that cannot be accurately predicted using conventional-aircraft design tools. This flow complexity motivates the use of advanced computational fluid dynamics (CFD) tools even in...

An innovative and efficient method for fast prediction of the aerodynamic performances of a Vertical Takeoff and Landing Micro Air Vehicle (VTOL MAV) during the conceptual design phase is presented in this paper. Characterized by low aspect ratio lifting surfaces and low Reynolds number regime flight, typical MAVs generate complex flow phenomena th...

This research focuses on the numerical investigation of the aerodynamic and stability characteristics of a Vertical Takeoff and Landing (VTOL) Micro Air Vehicle (MAV). The numerical investigation is divided into two parts: statics and dynamics. In the static analysis, the full configuration of the VTOL MAV as well as various design and operating pa...