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The article presents results of parametric identification of mechanical part of drive system with permanent magnet synchronous motor by means of heuristic method of Particle Swarm Optimization (PSO). The assumed mechanical part has a complex structure, consisting of two-mass connected by an elastic joint with backlash. The optimization process was designed to find model parameters that assure the...
The simulation of transmission and distribution grids comes with a trade-off between the number of modeled components and the modeling depth on the one hand and the simulation speed on the other hand. An example system of a grid converter of a 2 MW full scale converter system is used to show a step-by-step model order reduction. Starting from a detailed switched model the order reduction is shown...
This paper presents a new algorithm for finding the parameters that characterize a photovoltaic panel by using the Glowworm Swarm Optimization algorithm. This new algorithm shows great simplicity, flexibility and precision, being able to precisely locate the global optimum point or multiple global optimum points, independently of the initial conditions. The approach here adopted allows the utilization...
Coriolis vibrating gyroscopes can be modeled by a planar resonator, using masses, springs and damping. In this paper, the corresponding equations are studied in order to characterize real vibrating cells. It is shown how to present the problem to allow efficient numerical simulations and analytic developments. In particular, the use of the method of Averaging is fundamental, simplifying most of the...
Due to the larger scale of power systems and larger number of converters involved, the simulation of power systems becomes slower, with lower accuracy. FPGA is the new generation computation hardware, which is an integrated circuit designed for a special function. However, FPGA simulation still requires the parallel technology to extend the simulation scale. Network tearing interfaces can be used...
Military modelling and simulation plays a key role in troops training as well as in verification of military scenarios. Most of topics in the modelling of military performance were already successfully implemented into the simulators (like troops moving, fighting, aircraft simulation, etc.) however the simulation of surface (ground) based air defence systems capabilities are not fully developed now...
Centrifugal pumping systems are the common hydraulic devices mainly driven by electric drives. Their efficiency varies significantly with the change of working point location that depends on the positions of the performance and system curves. This paper is devoted to the study of the pumping system efficiency at throttling and speed control. A model-based calculation method for the single-drive centrifugal...
Electrified guided vehicles are normally equipped with regenerative braking devices, while traction lines are supplied by non-reversible substation, thus allowing braking energy recovery only if nearby other vehicles are absorbing power. To enhance the effectiveness of regenerative braking, some energy storage can be installed along the line. Evaluation of its cost effectiveness requires time domain...
This paper describes a graphical user interface (GUI) tool designed to support cell design and development of manufacturing processes for an automotive battery application. The GUI is built using the MATLAB environment and is able to load and analyze raw test data as its input. After data processing, a cell model is fitted to the experimental data using system identification techniques. The cell model's...
This work presents the modelling, analysis and control of a steel strip coiling system using twin roll direct casting, in a plant placed at Technological Research Institute of Sao Paulo. The characteristics of the process are first introduced. After that the mathematical modelling of the coiling system and its parametric changes were addressed. The control system was first implemented using a PID...
This paper shows control results of simulations on mathematical model and real measurements on the real model of the water tank. The level in the tank is controlled via input volumetric flow rate through the proportional solenoid valve. The adaptive approach with the recursive identification was employed here for controlling of this system. The controller could be tuned by the choice of the pole position...
The piezoelectric actuator is a voltage spring system that behaves in similar characteristic to mechanical mass spring system. It converts electrical signal to physical displacement. The displacements profile of the piezoelectric actuator shifts due to hysteresis and creep during actuation. Numerous equations were used to describe model of actuator in the past. In this work, we presented the behaviour...
This paper focuses on modelling and performance evaluation of an Intermodal Freight Transport Terminal (IFTT), the rail-road inland terminal of a leading Italian intermodal logistics company. The IFTT is regarded as a discrete event system and is modelled in a timed Petri net framework. By means of suitable performance indices, we simulate the Petri net model and evaluate the operational performance...
In this paper, the switching flow-graph models are developed to study the nonlinear behavior of DC-DC switching converters. Based on the concept of virtual switches and virtual switching functions, switching flow-graph (SFG) model are created easily without complex mathematics. The SFG modeling technique is helpful for undergraduate students or beginners to understand how the switching converters...
Modelling and simulation have become inseparable activities in any applied science or engineering research and development endeavour. The nature of inseparability is even more evident in the case of the automotive industry. Adding to the modelling complexity are the electric vehicles with a rich interplay of previously well demarcated disciplines of electrical-electronics engineering and mechanical-automotive...
This paper presents a cell-level simulation model of photovoltaic (PV) systems that is capable of reproducing partial-shading and other mismatch effects at high granularity. The nonlinear diode voltage-current characteristic is stored in a piecewise-linear model, and the stored values are employed to compute the Jacobian matrices very efficiently. As a result, the model can be solved with low computational...
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.
DC power system in ship applications is an emerging technology, which provides new opportunities for reducing fuel consumption and emission. However, the resulted power electronic-based system onboard the ship requires effective analysis tools to facilitate a full-realization of the advantages. This paper reviews the modelling of hybrid electric ship components including mechanical and electrical...
Modelling and simulation are two promising methodologies in attempts to manage the ever increasing complexity of modern technical systems. The knowledge of the inherent continuous and discrete-event dynamics of systems improves the understanding of systems operation and provides the base for designing management and control strategies. Modelling and simulation are therefore vital components of engineering...
In this paper, a series of system-theoretical issues in the frame of a traffic systems engineering are comprehensively addressed and discussed with a particular focus on a nonlinear dynamics perspective. Transportation systems are complex (systems of systems) nonlinear dynamical systems and their comprehensive engineering does involve amongst others the following steps: modeling/identification, simulation,...
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