scholarly journals Determination of the magnetic separator separation function

2018 ◽  
Vol 251 ◽  
pp. 03027 ◽  
Author(s):  
Evgeniy Kharlamov
Keyword(s):  
Separation Coefficient ◽  
Separation Function ◽  
Magnetic Separator ◽  
Operating Modes ◽  
Boiling Layer

The article considers the design of magnetic separators for separation of iron-containing powders. The technology of separation of waste (tailings) of production by means of a separator of a boiling layer is offered. A technique for determining the separation coefficient and the dependence of the separation coefficient at different operating modes is presented. The efficiency of separation of the proposed separator above the traditional ones is shown.

scholarly journals Parameters and modes of the technological process of scattered rice sowing

2021 ◽  
Vol 285 ◽  
pp. 02007
Author(s):  
Ivan Masienko ◽  
Sergey Shevchenko ◽  
Kirill Glytyan
Keyword(s):  
Technological Process ◽  
Radius Of Curvature ◽  
Theoretical Studies ◽  
Technological Operation ◽  
Design Features ◽  
Operating Modes ◽  
Seed Material

The paper presents the determination of main parameters and operating modes of scattered centrifugal devices of technical units when using them in the technology with scattered sowing when performing the technological operation of sowing rice in liquid-flexible soil. Theoretical studies of the dependence of design features of the blade of a spreading disk on the number of blades installed on it and the radius of curvature of the end bend on the height of blades are carried out. The values of the diameter of the disk of a centrifugal dispenser and parameters of blades are set, which will increase the uniformity of distribution of seed material for a given width of a gripper and reduce its consumption.

scholarly journals Cavitation in swirling flows of hydraulic spillways

2019 ◽  
Vol 91 ◽  
pp. 07022
Author(s):  
Genrikh Orekhov
Keyword(s):  
Flow Rate ◽  
Vortex Flow ◽  
Structural Elements ◽  
Flow Energy ◽  
Operating Modes ◽  
Swirl Angle ◽  
Energy Dissipators ◽  
High Head ◽  
The Impact

During operation of high-head hydraulic spillway systems, cavitation phenomena often occur, leading to destruction of structural elements of their flow conductor portions. The article is devoted to the study of erosion due to cavitation in the circulation flows of eddy hydraulic spillways, including those equipped with counter-vortex flow energy dissipators. Cavitation destructive effects depend on many factors: intensity consisting in the rate of decrease in the volume or mass of a cavitating body per unit of time, the stage of cavitation, geometric configuration of the streamlined body, the content of air in water, the flow rate, the type of material. The objective of the study consisted in determination of cavitation impacts in circulating (swirling) water flows. The studies were conducted by a method of physical modeling using high-head research installations. Distribution of amplitudes of pulses of shock cavitation impact is obtained according to the frequency of their occurrence depending on the flow velocity, the swirl angle, the height of the cavitating drop wall and the stage of cavitation. The impact energy depending on the stage of cavitation and the flow rate is given for different operating modes of the counter-vortex flow energy dissipators of a hydraulic spillway. In the conclusions, it is noted that cavitation impacts in the circulation flows occur mainly inside the flow, which is a fundamental difference from similar processes in axial flows.

scholarly journals Thermodynamic analysis of combined cycle plant operation as part of an energy-saving system based on an absorption bromide-lithium refrigerating machine

2020 ◽  
Vol 4 (4) ◽  
pp. 57-65
Author(s):  
L. V. Galimova ◽  
◽  
D. Z. Bairamov ◽  
Keyword(s):  
Thermodynamic Analysis ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Combined Cycle ◽  
Plant Operation ◽  
Operating Modes ◽  
System A ◽  
Combined Cycle Plant ◽  
Current Energy

The main directions of research of the current energy-generating system, taking into account its technical limitations, are optimization and forecasting based on the analysis of its operating modes. Thermodynamic analysis involves determining the efficiency of the system based on the research of exergy efficiency and exergy losses. In this project, we propose methodic and results of exergy analysis of combined cycle gas plant operation as an object of energy production, the efficiency which is provided by cooling the outdoor air using an absorption bromide-lithium refrigerating machine. Conducting exergy analysis for determination of exergy destruction allow to determine the potential for increasing the efficiency of the system. A flow graph and an incident matrix are presented. The exergy efficiency of the combined cycle gas plant under the specified conditions is 46,5%. Based on the exergy analysis, the final diagram of the distribution of fluxes and losses of exergy of the combined cycle gas plant is presented

scholarly journals Hybrid Control Accommodation forWater-asset Management of Hydraulic Systems Subjected to Large Operating Conditions

2007 ◽  
Vol 2 (3) ◽  
pp. 241
Author(s):  
Eric Duviella ◽  
Pascale Chiron ◽  
Philippe Charbonnaud
Keyword(s):  
Asset Management ◽  
Hydraulic System ◽  
Hybrid Control ◽  
Operating Conditions ◽  
Hydraulic Systems ◽  
Selection Technique ◽  
Operating Modes ◽  
Transfer Delay ◽  
Simulation Results

The Hybrid Control Accommodation (HCA) strategy was proposed to improve the water-asset management of hydraulic systems by resource allocation and setpoint assignment. Hydraulic system dynamics are taken into account during the setpoint assignment step which consists in controlling gates for large operating conditions. For hydraulic systems subjected to strong disturbances, transfer delays are variable, thus different operating modes must be considered. A multimodelling method, associated to a selection technique of transfer delay, allowing for the determination of the number of models, is proposed. The simulation results on the first reach of the Neste canal show the effectiveness of the HCA strategy.

scholarly journals Determination of the optimal modes of filling and emptying the chamber of the navigational lock of a low-pressure hydroelectric complex

2021 ◽  
Vol 2061 (1) ◽  
pp. 012136
Author(s):  
K P Morgunov ◽  
G Ryabov ◽  
I Buchnev
Keyword(s):  
Low Pressure ◽  
Hydrodynamic Forces ◽  
The State ◽  
Normative Values ◽  
State University ◽  
Operating Modes ◽  
Lock Chamber ◽  
Inland Water Transport ◽  
Ship Lock

Abstract The construction of the low-pressure Nizhny Novgorod hydroelectric complex covered by the Strategy for the Development of Inland Water Transport of the Russian Federation for the period up to 2030 envisages a ship lock as part of the hydroelectric system to ensure ships passage. One of the options under consideration is a ship lock with a head power system, which uses short bypass water-circulating culvert for filling and emptying the chamber. At the same time, an important task is to select the optimal modes ensuring movement of the gates of the filling and emptying systems, in which the normative values of the hydrodynamic forces influencing the vessel in the chamber during the lock process would not be exceeded. The article describes the experience of performing laboratory hydraulic studies of the ship lock model and presents the results of determining the optimal modes of locks movement in the ship lock filling and emptying systems. The studies were carried out on a model located in the hydrotechnical laboratory named after Professor V.E. Timonov of the State University of Maritime and River Fleet named after Admiral S.O. Makarov. The article describes the experience of performing laboratory hydraulic studies of the ship lock model and presents the results of determining the optimal modes of gates movement in the ship lock filling and emptying systems. The studies were carried out on a model located in the hydrotechnical laboratory named after Professor V.E. Timonov of the State University of Maritime and River Fleet named after Admiral S.O. Makarov. The studies included three series of measurements taken at different speeds of gates movement. The speeds were assigned based on the following idea: the maximum hydrodynamic forces of one of the series were close to the permissible values, and of the other two – 30–50 % smaller and larger, respectively. The experimental results determined the optimal operating modes of the systems for filling and emptying the lock chamber. It is recommended to select of the optimal modes of gates movement in full-scale conditions on the newly built ship locks immediately after their construction.

The determination of induction motor losses in steel taking into account its saturation

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mykhaylo Zagirnyak ◽  
Vita Ogar ◽  
Volodymyr Chenchevoi ◽  
Rostyslav Yatsiuk
Keyword(s):  
Induction Motor ◽  
Electromotive Force ◽  
Induction Machine ◽  
Content Type ◽  
Operating Modes ◽  
Machine Steel ◽  
Harmonic Components ◽  
First Time ◽  
Analytical Expressions

Purpose This paper aims to work out a method for calculating losses in induction motor steel taking into account its saturation. Design/methodology/approach The theory of electric machines is applied during the analysis of induction motor equivalent circuits. The theory of Fourier series is used to determine the harmonic components of voltage, current and power. Instantaneous power theory and trigonometric transformations are used to solve algebraic and differential equations and their systems. The methods of approximation and interpolation are applied to obtain analytical expressions from the experimental data. Experimental research was carried out to verify the reliability of theoretical provisions and research results. Findings A method for assessing an induction machine steel as a function of the generalized electromotive force has been proposed. It allows taking into account higher harmonics of the current, which are caused by the presence of nonlinearity of an induction motor magnetic circuit. Practical implications The obtained results can be used in calculating the energy characteristics and operating modes of an induction motor, as well as in the construction of control systems. Originality/value A method for determining the losses in the stator steel of an induction motor, using a generalized electromotive force, has been proposed for the first time. It enables taking into account the currents flowing both in the stator circuit and in the rotor circuit.

EFFICIENCY UPGRADING TECHNIQUES FOR COMPLEX MINE VENTILATION SYSTEMS

2019 ◽  
Vol 4 (1) ◽  
pp. 283-291
Author(s):  
S.V. Malcev ◽  
◽  
B.P. Kazkov ◽  
M.A. Semin ◽  
◽  
...  
Keyword(s):  
Mutual Influence ◽  
Production Capacity ◽  
Ventilation Network ◽  
Joint Operation ◽  
Mining Operations ◽  
Operating Modes ◽  
Geological Conditions ◽  
Set Up ◽  
Mineral Reserves

The exhaustion of readily available mineral reserves, which were in favorable geological conditions, drives the need to expand the areas of mined deposits and the transition to deep-seated horizons to maintain or increase production capacity. With an increase in the developed areas and the depth of mining operations, the length of the networks of mine workings increases, the working zones move to the borders of the mine fields. In the conditions of the majority of existing mines, the main fan units (MFU) are working at the limit. It leads to necessity in designing and installing new MFUs into operation. In modern conditions, the determination of joint operation modes for several main fan units is carried out empirically without an estimate of energy consumption. When operating several main fan units, it is important to consider their mutual influence and set up operating modes in such a way that each of them works for its part of the ventilation network as efficiently as possible...

scholarly journals Determination of Efficiency of Operation of the Existing Pumping Equipment of Oil-Pumping Stations

2020 ◽  
Vol 129 (4) ◽  
pp. 46-50
Author(s):  
V. V. Shalai ◽  
◽  
M. O. Myznikov ◽  
M. I. Kononova ◽  
◽  
...  
Keyword(s):  
Rational Use ◽  
Operating Modes ◽  
Pumping Stations ◽  
Oil Pipelines ◽  
Pumping Equipment ◽  
Pumping Units

Improving the efficiency of operation of main pumping units is one of the pressing issues of modern practice of operating oil pipelines. The change in pumping capacity leads to a change in the operating modes of pumping equipment. This article proposes a methodology for assessing and improving the efficiency of the operation of oil pipelines based on the rational use of existing pumping equipment of pumping stations.

scholarly journals Determination of basic parameters and their boundary conditions of modern passive infrared motion detectors

2020 ◽  
Vol 1 (1) ◽  
pp. 31-42
Author(s):  
R. Holovatskyy ◽  
M. Lobur
Keyword(s):  
Boundary Conditions ◽  
Supply Voltage ◽  
Primary Sources ◽  
Operating Modes ◽  
Basic Parameters ◽  
Motion Detectors ◽  
Pattern Of Motion ◽  
Passive Infrared ◽  
Schematic Diagrams

The principle of work of modern passive infrared motion detectors of the known world manufacturers is considered; their peculiarities and fields of use are indicated. Both the typical structural and schematic diagrams are given. The basic parameters of modern passive infrared motion detectors and their boundary conditions have been determined based on the principle of operation of the detector and the synthetic processing of information from primary sources. The boundary conditions for the number of rays of the near middle and far zones of the pattern of motion detectors are given. Limit conditions for supply voltage, operating temperatures, and consumption currents in different operating modes are also given.

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