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The paper presents dynamic properties of a current controlled DC motor drive supplied by a transistor four-quadrant pulse converter. The contribution deals with accuracy of a torque producing armature current control loop from the view of the load torque. There is shown fundamental mathematical description for the control structure of a DC motor drive with respect to the armature current. The derivations...
Discontinuous Galerkin finite element method (DG-FEM) for electromagnetic simulation is implemented using the Julia language in this work. DG-FEM is a combination of finite element method and finite volume method and it employs high-order spatial and temporal basis to obtain high-order accuracy. Julia is a relative new language specially built for high performance computing. It is adopted in DG-FEM...
Wireless Sensor Network as an important technology of Internet of things' development, is more and more widely used in various research fields. This paper mainly researches the part of localization application based on wireless sensor network, focuses on DV-Hop localization algorithm, and gives its algorithm simulation and analysis of the simulation results. Also this paper improves the algorithm...
Recognition of network boundaries in wireless sensor network (WSN) applications is crucial from two reasons. First, a knowledge of boundary nodes can help to increase a security performance of sensor network. And second it can significantly contributes to the energy conservation of inner nodes that can be switched into the sleeping modes during no activity is presented on the network boundaries. Furthermore,...
Taking error and error rate of change as input, this paper realized the online slef-tuning of PID parameter with the method of fuzzy inference, and made a modeling design and simulation on the controller in the Matlab environment, and realized the non-linear processing to PID controller and the non-linear mapping between the changes of system characteristics and controlled variables. This hybrid system...
According to the basic theory of improving digital precision, the paper brings forward a method to improve steady-state precision of fuzzy control based upon the steady-state error of conventional fuzzy control, by adjusting the quantification factor in the small error range and using the original rule table of conventional fuzzy control. Simulation result by MATLAB shows that the method can improve...
Transformer fault diagnosis based on artificial neural networks (ANN) is widely used, because ANN has essential nonlinear character, parallel processing ability and the ability of self organize and self learning. But there exist problems if we use traditional ANN method alone to diagnose transformer fault, the large input vector dimension and complex training database will cause the computation complexity...
In this paper frequency analysis of spoken Urdu numbers from dasiasifrpsila (zero) to dasianaupsila (nine) is described. Sound samples from multiple speakers were utilized to extract different features. Initial processing of data, i.e. time-slicing and normalizing and was done using a combination of Simulink and MATLAB. Afterwards, the same tools were used for calculation of Fourier descriptions and...
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