frequency

Modeling of Steady-state Modes of the Electrical Network From the Synchronous Electric Drive of Hydraulic Loading

Pumping stations that provide fluid transportation by pipeline are significant consumers of electricity. Energy overruns due to sub-optimal modes of operation of individual high-power units or sub-optimal number of simultaneously operating less powerful units are quite significant and can have a significant impact on overall energy consumption. Energy overruns at pumping stations also lead to significant overruns in electricity grid elements.

Substantiation of parameters and modelling the operation of three-mass vibratory conveyer with directed oscillations of the working element

The purpose of research. The main goal of the presented research consists in substantiation of inertial, stiffness and force (excitation) parameters of mechanical oscillatory system of three-mass vibratory conveyer with directed oscillations of the working element in order to provide the highly efficient (high-performance) resonant operation mode. Methodology. The technique of the research is based on fundamental concepts of engineering mechanics and theory of mechanical vibrations.

Adaptive Radio Resources Management Considering Noiseimmunity Conditions

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.

Temperature Dependence Estimation of the Vibration and Frequency Sensor Resonator Mechanical State

The complex of technological and metrological researches concerning development of filamentous monocrystals application and fixing methods on various materials of substrate (elastic elements) is considered. The ways of uncontrolled distortions avoiding of the initial monocrystal defect-free structure that can occur at the nodes of its mounting and reduce the Q-value of the resonator oscillations, which is the main characteristic of the tensotransducer quality, is shown.

Two-mass Vibratory Conveyor-manipulator with Three-Component Electromagnetic Drive

Vibratory conveyor with three-component oscillations provides the opportunity to move the piece goods and details for any trajectory on a plane. Phase difference between independent horizontal (longitudinal or transverse) and vertical (normal) oscillations releases elliptical vibration of conveyor in plane perpendicular to the conveyor’s track. Elliptical vibrations allow increasing conveying velocity and inclination angle of conveyor’s track in comparison with the simplest linear vibrations.

The analysis of autonomous electric power supply system, based on asyncronised generator with three-phase modulator with one star scheme during complex loading

Investigation of electromagnetic and electromechanical processes, which take place in the autonomous power supply system based on asynchronised generator with three phase modulated exciter, was conducted by means of mathematic experiment. The processes in terms of work suitableness of power supply system during its work at the junction of asynchronous motors and active-inductive load were analysed. Regularities of electromagnetic and electromechanical processes, depending on the schedule of consumers’ work and system of commutator management parameters were determined.

Low vibrokavitator for cavitation processing chemically active fluids, fluids under pressure and at elevated temperatures

The description of law frequency vibrocavitator design for cavitational processing of chemically active liquids, liquids under pressure and high temperature is carried out. Its basic design and technological parameters are set up; by controlling them one can choose optimal regimes of cavitational processing. A special device for choosing range frequency fluctuation of cavitation breakers is developed.

The defining of sample size for statistical analysis of texts

The article is dedicated to one of the most important areas of quantitative studies of language and speech that is the study of information and statistical properties of text. An attempt was made to establish Cheremshyna’s literary works percentage sufficient to analyze relative frequencies of characters in his works and to investigate the stability of these frequencies. A number of conclusions were made about the size of text passages which may form text-sample for statistical surveys.