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Mobile self-organizing ad hoc networks (MANETs) can significantly enhance the capability to coordinate the emergency actions as well as monitor contaminated areas, explore unmanned space, inspect and control working environments. The management of networks that can dynamically and freely organize into temporary topologies raises interesting problems, that are particularly challenging for networks...
The paper presents performance analysis of a permanent magnet synchronous motor (PMSM) drive with torque and speed control. The PMSM motor requires sinusoidal stator currents to produce constant torque. The paper presents constituents for the mathematical analysis of the motor operation within the dq-axis model. The mathematical model serves as inspiration for development of a drive design based on...
An important part of the modern computer networks design is to develop novel technologies, architectures and control mechanisms for network devices enabling power saving by adapting network capacities to current traffic loads and user demands. We describe centralize and hierarchical control frameworks for reducing power consumption in backbone computer networks. The implementation of these frameworks...
A cooperative ad hoc network is a collection of wireless devices that collaborate with each other to form a network system that dynamically adapts to changes in an unknown environment to achieve a given goal. Such a network is often built from mobile devices. Mobility modeling is a critical element that influences the performance characteristics of an ad hoc network. In this paper, we describe an...
Dc tram traction voltage is obtained by rectifying grid ac voltage with help of transformer-rectifier sets. In Poland typically 6- or 12-pulse systems are used. 24-pulse system may be achieved by parallel operation of two Yyd transformers with primary windings arranged as zigzag. This paper deals with 24-pulse system design using cost-effective transformer with partially integrated secondary windings...
Possible formulations of mathematical programing problem concerning energy aware network are presented. Two main possibilities of reducing problem complexity are analysed: allocation of predefined paths and reformulation of task using continuous variables. Properties of both methods are analysed and hybrid formulation is proposed. Comparison of complexity is provided.
The paper presents results of investigating symmetry of signals used to determine motor shalt angular position and generated by two different sensors. One group of sensors was built into the motor and consisted of six single Hall sensors placed inside rotor slots. The other group consisted of six Hall sensors positioned in the same way as in the first group with respect to each other, but assembled...
To obtain rectified voltage needed for d.c. traction networks, different types of energy transformation circuits may be used. This paper deals with 6- and 24-pulse transformer-rectified set operation under different supply condition. Commutation issues have been investigated for Yd transformer supplied with sinusoidal and distorted voltage. It has been shown that supply voltage THD factor affecting...
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