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During an oil spill, an accurate assessment of the trajectory of oil is important for a quick and effective remediation response. In the remote Arctic, oil fate and transport models are critical; especially during winter months when darkness and ice presence hamper visual detection of oil. A set of equations to describe the transport of oil in ice-covered waters and an environmental database were...
Device screen size, design layout and resolution are some of the device context parameters which impact video quality on mobile devices. In this paper, through subjective tests, we evaluate the impact of mobile device pixel density on the video quality. We then, through the subjective test, propose a video quality model that takes pixel density into consideration. The proposed model was evaluated,...
The Internet of things (IoT) is the natural evolution of the current Internet. As such, IoT systems do not just handle critical information as passwords, identities, personal information, routines, etc., but they also are able to control a whole variety of systems, for instance a robotic network in the automotive industry, autonomous cars networks, human health care and many systems in other domains...
After being aware of the high demand of vapor compression refrigeration systems for the conservation of agri-food and hydrobiological products and the high economic costs that the use of these systems produces, both academia and industry have carried out studies that have allowed them to develop advanced technologies in order to produce savings in energy consumption. These advances lie in the production...
As very low frequency high-voltage testing is becoming more popular, it is essential to simulate partial discharges in an insulation material at such frequency to investigate physical activities. In this study, measurement data of partial discharges in a cylindrical void bounded by an insulation material were recorded under both 50 Hz and 0.1 Hz excitation for fitting the simulation model. The developed...
This paper presents an analytical model to provide a rapid estimation of the steady-state averaged power loss of a T-type STATCOM with Virtual Zero level Modulation (VZM) to balance the neutral point voltage. A case study is then conducted on a 54kVA rated T-type STATCOM system to investigate the power loss distribution over power devices and variations over switching frequency. A comparison is made...
There is a growing demand for inexpensive and efficient gas sensors which have important applications in various areas including industrial safety and emission monitoring in coal fired and lignite based thermal power plants. Various air polluting and hazardous gases are emitted from power plants (Hydrogen (H2), Nitrogen Dioxide (NO2), Chlorine (Cl2), Carbon Dioxide (CO2), Sulfur Dioxide (SO2), etc)...
This paper presents dynamic analysis of a Modular Multi-Parallel Rectifier (MMR) based on state-space modelling. The proposed topology is suitable for high power motor drive or multi-parallel AC-DC applications, which can reduce line current harmonics emissions significantly. However, a proper controller is required to share and control current through each rectifier. Mathematical analysis and simulations...
Progresses obtained in command and power electronics have increased the technical and economic performances of brushless direct current motors. Consequently, the problem of optimum design and operation of these motors, frequently used for driving small vehicles, is a very present one. Studies presented in literature show that high oscillations of torque occur in these motors in a complete rotation...
The specific problems of the disconnection of HVDC breakers need an analysis of performances at laboratory scale. In the study of hybrid circuit breakers with commutation, three steps are necessary: modeling, simulation and experimental tests. The paper presents a modeling procedure for a hybrid commutation breaker intended to operate using resonant circuits phenomenon. Using the Matlab platform,...
For the widely-adopted inverter-fed drives, the stator winding insulation is more prone to various stresses compared to the line-start machines, i.e. the high rates of voltage change due to inverter switching (dv/dt), which will result in higher chances of insulation breakdown. To better illustrate the dynamic behaviors of the IPM machines under the stator turn fault, this paper presents a transient...
This paper studies the effect of different slice count on quality of multi-slice simulation. The slices are distributed evenly along the axial length of the machine. The torque and current waveforms at nominal point are analysed for different numbers of slices, and compared with the measured waveforms. Practical optimum is identified finding a trade-off between simulation time and results quality.
The article describes operational principles of the modeling tool for forecasting the world liquid fuels market, part of the ERI RAS modelling complex. The liquid fuels market forecasting Block functions as a tool for long-term forecasting of the oil industry development, government and corporate planning.
This paper presents ongoing work on the formalism of Cyber-Physical Systems (CPS) simulations. These systems are distributed real-time systems, and their simulations might be distributed or not. In this paper, we propose a model to describe the modular components forming a simulation of a CPS. The main goal is to introduce a model of generic simulation distributed architecture, on which we are able...
The location of distributed generators (DG) with different size on the power distribution systems could modify the voltage profile and impacts the level of real power losses. Faster optimization technique as well as a high computational speed of load flow are therefore required. This paper presents a linear model and an algorithm that allow to calculate the real power losses of the system. This methodology...
The paper presents a system of controlling a biomechanical walking machine. Our approach is quite peculiar because it simultaneously solves the inverse and the direct control problem on the basis of the machine model. At first, using the data about the movement of the machine body the trajectories of the feet movement are calculated; then, using the machine model, leg joints turn angles are determined,...
This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
A Simulink based model for a centrifugal pump power estimation is proposed. The new model consists of the pump, pipeline, pressure regulation valve, fluid reservoir and metering equipment. The model is developed to provide the possibility of power calculation during both throttling and speed control. To evaluate the model, a series of tests have been conducted. Tests proved that the designed model...
This paper aims at presenting a Sliding Mode Control with constraints for urban transportation network. Firstly, by applying the store-and-forward approach, the transportation network is modeled into a linear model. Then, the controllability analysis has shown that the system is not totally controllable. Hence, it is split into controllable subsystem and uncontrollable one. Furthermore, the Sliding...
This paper presents design and implementation of face tracking system using servo-motor-controlled Pan-Tilt visual system. The objective is to maintain the position of a tracked object at the center of frame window on the screen. A simple camera is used as visual sensor to obtain the face object's actual position. Combination of Viola-Jones and Template Matching algorithms are used for face detection,...
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