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Axial flow fan is extensively applied in automation control systems for cooling. Improving the rotational speed is undoubtedly an effective method to achieve higher total pressure and larger flow rate. In this paper, the performance of axial flow fan under high rotational speed is investigated by using Computational Fluid Dynamics (CFD). Ffowcs Williams and Hawkings (FW-H) model is used to capture...
This paper focuses on the simulation study of speed tracking control applied to the PMSM (Permanent Magnet Synchronous Motor). Previous works has presented the (d-q) model and the NDI (Nonlinear Dynamic Inversion) control has been used. A limitation of the speed tracking control versus frequency and amplitude is exposed and explained in order to introduce the performance of NDI control method. An...
Coaxial-rotor configuration with the compact structure and vertical take-off ability make itself a good configuration to execute highly difficult task. In this paper, the structural design of coaxial-rotor system is introduced, and we discuss the control principle behind coaxial configuration. Then, the dynamic modeling is presented based on the combination of considering two rotors as dynamics model...
Wind power generation with permanent magnet synchronous machines (PMs) has been made possible using power electronic converters. With the increasing use of such systems, the numerically efficient modeling and simulation are of critical importance. As an alternative to traditional qd models, the coupled-circuit phase-domain (CCPD) and voltage-behind-reactance (VBR) models have been recently proposed...
Modeling renewable energy generation systems with electrical machines has been an active area of research, wherein interfacing the machine models with power electronic converters is a known challenge area. As an alternative to traditional qd models, the coupled-circuit phase-domain (CCPD) and voltage-behind-reactance (VBR) models have been recently proposed. The permanent magnet (PM) generator has...
We continue to consider the question of what language features are needed to effectively model cyber-physical systems (CPS). In previous work, we proposed using a core language as a way to study this question, and showed how several basic aspects of CPS can be modeled clearly in a language with a small set of constructs. This paper reports on the result of our analysis of two, more complex, case studies...
The modern design of an induction traction machine includes a complex of coupled electromagnetic and thermal analyses for effective utilization of machine's space. This paper summarizes a comparison between less and more complicated ways of induction machine's modelling.
The control of active and reactive power of a doubly-fed machine (DFM) can be—due to the application of power electronics—very rapid, comparable to the control of FACTS devices. Besides DFMs in pumping-storage plants will become an important part of Slovenian electric-power system and it is important to know how these machines are working. This paper presents how to model a control of a DFM in a pumping-storage...
This study presents three-dimensional numerical simulations of a cross-flow vertical-axis marine current turbine (straight-bladed Darrieus type) with particular emphasis on rotor-performance prediction and hydrodynamic characteristics. Numerical investigations of a model turbine (power coefficient and flow behaviour) were undertaken using developed computational models. Turbine design was studied...
With the advent of various simulation software packages and low cost personal computing devices in the market, computer-aided teaching tools have become an important part of present pedagogy. These tools support the classroom teaching by enabling the instructor to illustrate the working of various systems by means of computer generated graphics. This paper presents a very easy and interactive model...
In this paper, a model of a three-shaft gas turbine which is based on modular modeling method has been founded by MATLAB/Simulink to study its performance. By combining the least-square and neural-network method in the process of modeling, we fit the gas turbine characteristics, and get a more accurate characteristic curve. Finally, according to experimental data in some working conditions, we calculate...
In this paper, a computer simulation of the Salient Pole Synchronous Machine (SPSM) is presented. This simulation employs a modeling based on the machine self and mutual inductance curves, determined from a methodology, not presented here. These methodology applies the experimental volt-ampere method to obtaining the inductances curves. From these inductance data, using a mathematical methodology,...
Centrifugal compressor is the vital part of many mechanical systems. The present paper deals with the simulation and the analysis of the fluid performance in two subsonic compressor stages under different rotational speed. The configurations used for the study is two subsonic centrifugal compressors with 60mm and 70mm diameter impeller wheels respectively. Numerical simulation is carried out with...
It is a known fact, that three-dimensional FE-Simulations are very slow, which prevents their usability in larger system models. In this paper, a Matlab/Simulink model for a TFM is developed to enable fast simulations of complete drive systems with power converters and other components. The model is derived by incorporating precomputed FEM data into a Matlab function, thereby allowing a 4.2 million...
An nonlinear simulation model of the Switched Reluctance machine with the operation at four-quadrant founded on MATLAB is presented. The simulation of the prototype with three given rotor speeds and four different loads are made. The simulated results on the rotor speed curves, the rotor speed ascending time and the phase current waveforms are given. It is shown that the operation of the Switched...
This paper presents the mathematical models and computer simulation for the power system of Yantai-Dalian train ferry. Firstly the system configuration is illustrated and then the mathematical models of main components are presented. Finally three typical dynamic operating scenarios are investigated through the computer simulations with Simulink. From the simulations, it is found that the machines...
This paper presents a new induction motor model specifically developed for simulating self-sensored variable speed drives which employ signal injection based sensorless control techniques. The model is to be used to investigate improved filtering algorithms and closed loop speed controllers. The model employs a simple state space equivalent circuit based model of the induction machine, which is enhanced...
This paper deals with a modeling approach of an embarked electrical network. This network is composed of a synchronous generator feeding linear and non linear load. In order to simplify the identification of inaccessible part of the generator, a specific modeling approach of the machine is established. Thus, the rotor is modeled by generalized transfer functions. Its order is chosen to have the desired...
In order to estimate the approach angle and relative height of Unmanned Aircraft Vehicle (UAV) which lands autonomously, a combinational approach of monocular vision and stereo vision is presented. From monocular sequences, vanishing line is extracted by Hough transform and RANSAC algorithm, and then approach angle of UAV is calculated through vanishing line geometry. From stereo sequences, feature-based...
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