енергетична ефективність

This work presents the electric control system for electric vehicle drive based on the strategy of direct torque control of a synchronous machine with permanent magnets. In order to provide energy efficiency in the first zone of angular speed regulation, the reference of the armature flux is formed depending on the current value of the electromagnetic torque of the machine.

The paper deals with the cooling approaches and aims at using solutions for the energy efficient and economically viable high density computing system construction and usage. Power consumption of the standalone high density computing systems and supercomputing clusters with different types of cooling has been considered and their characteristics have been estimated. The influence on the overall budget of the system construction and exploitation for 5 years of life time has been analyzed.

Operation of radio communication systems for special purposes (FSA SP) in practice is random in terms of various factors, some of which are codified in standards, and some — previously known. Specificity of modern shipyard JV determines the need to manage their operations in terms of parametric uncertainty as facility management and signaling uncertainty of external influences. So the challenge is the analysis and consideration of uncertainty arising from the operation of such a complex hierarchical system as the FSA SP.

In this paper we investigate electromechanical coupling coefficient. We show the investigation importance of spatial distribution coefficient of electromechanical coupling. This parameter characterizes the energy efficiency of piezoelectric transducer that in turn affects the acousto-optic devices in optical transport networks. We present basic definitions and types of electromechanical coupling coefficient. We also show the formula for determining the coefficient of electromechanical coupling that facilitates study of the spatial distribution of this coefficient.

In wireless sensor networks (WSN) is important task of self-organization networks. There are many different algorithms for self-organization of such networks. This choice determines the relevance of pre-emptive self-algorithm network with the additional information obtained from experts. In the article features practical application of the analytic hierarchy process to select a preferred algorithm for self-organization in wireless sensor networks.

With the development of cellular communications, the different problems of effective spectrum utilization to provide a high quality of service for large number of mobile users have been emerged. For the last years the development of wireless communications became a large scale, inducing developers of radiotechnic devices to find new solutions to the problem of effective utilization of the allocated spectrum and effective power maintenance.