scholarly journals Dynamic Modes of Synchronous Electric Drive with Centrifugal Hydraulic Load of Pump Station

2021 ◽  
Vol 7 (1) ◽  
pp. 48-55
Author(s):  
Vladyslav Lysiak ◽  
◽  
Mykhailo Oliinyk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Electric Drive ◽  
Performance Indicators ◽  
Pump Unit ◽  
Automatic Control Systems ◽  
Asynchronous Electric Drive ◽  
Pump Station ◽  
Hydraulic Load ◽  
Hydraulic Processes

The contemporary state of the modelling of the pump station’s electric drive in a complex with its centrifugal hydraulic load has been analysed. It was found that most studies focus either on the modelling and development of automatic control systems for the asynchronous electric drive of pumps or on the optimization of performance indicators of the station as a whole. Besides, usually only one of the subsystems of a pumping station (or an electrically-operated pump unit) is modelled with a good degree of detail: either electromagnetic or hydraulic. This approach does not allow a concurrent research of electromagnetic and hydraulic processes in them. The paper proposes a comprehensive mathematical model of the dynamic modes of the synchronous electrically-operated centrifugal pump unit with a pipeline, in which the electromagnetic and hydraulic subsystems are presented with a balanced degree of detail. The developed model was verified and its viable applications were suggested.

scholarly journals ПЕРСПЕКТИВИ РОЗВИТКУ ЕЛЕКТРОННИХ САУ ГТД

2018 ◽  
pp. 95-100
Author(s):  
Геннадий Степанович Ранченко ◽  
Анна Григорьевна Буряченко
Keyword(s):  
Mathematical Model ◽  
Automatic Control ◽  
Control Systems ◽  
Power Supply ◽  
Aviation Industry ◽  
Wireless Technologies ◽  
Central Institute ◽  
Automatic Control Systems ◽  
Aero Engine ◽  
Engine Type

The analysis of the basic directions of electronic automatic control systems for aviation gas-turbine engines (FADEC) development is presented. This analysis is executed on the base of materials of the Scientific and Technical Congress of Aero-Engine Manufacturers. This Congress passed within the limits of the International engine forum in April 2018 in Moscow under aegis of the International association «Association of Aero-Engine Manufacturers» (ASSAD). The review of a modern condition of developing works of the specialized scientific enterprises in the field of application of onboard mathematical model «virtual engine» and introductions of wireless technologies in the aviation industry is given. It is noted, that design offices of manufacturers introduce as perspective decisions the modular unitized design for electronic automatic control systems and the “vibration passport” for engine type. The using of onboard mathematical model «virtual engine» provide the electronic automatic control systems with the possibility to apply the new controlling concepts and to compensate the failures of transducers which have information interchange with the automatic control system. The software «virtual engine» is developed by scientists of Central Institute of Aviation Motors (Moscow) and of Ukrainian National Aerospace University (Kharkov). The wireless technologies need the specialized power supply devices for wireless engines transducers. There is the tendency to use the engine energy (thermal engine energy, vibration engine energy) for such a power supply devices which is to be built on the base of thermoelectric generators, vibration generators and magnetic induction generators. The investigation of engine vibration characteristics in order to form the “vibration passport” for engine type is described. This passport is to be used for engine diagnostic during exploitation. There is described the method of electronic automatic control systems reliability confirmation by comparison with the prototypes (analogs) which is proposed by scientists of Central Institute of Aviation Motors.

scholarly journals The Mathematical Models of Lattice Functions in Modelling of Control System

2021 ◽  
Vol 2096 (1) ◽  
pp. 012149
Author(s):  
V Kramar
Keyword(s):  
Mathematical Model ◽  
Laplace Transform ◽  
Mathematical Models ◽  
Control Systems ◽  
Time Domain ◽  
Discrete Control ◽  
Automatic Control Systems ◽  
The Laplace Transform ◽  
Lattice Function ◽  
The Time Domain

Abstract The paper proposes an approach to constructing a mathematical model of lattice functions, which are mainly used in the study of discrete control systems in the time and domain of the Laplace transform. The proposed approach is based on the assumption of the physical absence of an impulse element. An alternative to the classical approach to the description of discrete data acquisition - the process of quantization in time, is considered. As a result, models of the lattice function in the time domain and the domain of the discrete Laplace transform are obtained. Based on the obtained mathematical models of lattice functions, a mathematical model of the time quantization element of the system is obtained. This will allow in the future to proceed to the construction of mathematical models of various discrete control systems, incl. expanding the proposed approaches to the construction of mathematical models of multi-cycle continuous-discrete automatic control systems

scholarly journals TIME-VARIANT MODEL OF HEAT-AND-MASS EXCHANGE FOR STEAM HUMIDIFIER

2020 ◽  
Vol 10 (2) ◽  
pp. 24-27
Author(s):  
Igor Golinko ◽  
Volodymyr Drevetskiy
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Mass Exchange ◽  
Dynamical Model ◽  
Heat And Mass Exchange ◽  
Automatic Control Systems ◽  
Exhaust Ventilation ◽  
Industrial Complexes ◽  
Dynamical Properties ◽  
Lumped Parameters

The dynamical model of heat-mass exchange for a steam humidifier with lumped parameters, which can be used for synthesis of control systems by inflowing-exhaust ventilation installations, or industrial complexes of artificial microclimate, is considered. A mathematical description that represents the dynamical properties of a steam humidifier concerning the main channels of control and perturbation is presented. Numerical simulation of transient processes for the VEZA KCKP-20 humidification chamber to the influence channels was carried out. The achieved dynamical model of a humidification chamber can be the basis for the synthesis of automatic control systems and simulation of transient states. A significant advantage of the obtained mathematical model in the state space is the possibility of synthesis and analysis of a multidimensional control system.

scholarly journals Influence of wind disturbances and nonlinearities of servo drive on the contour of stabilization of the flight of height of unmanned aerial vehicle

2019 ◽  
pp. 23-30
Author(s):  
V. A. Malkin ◽  
I. V. Rozhkov ◽  
A. A. San’ko
Keyword(s):  
Mathematical Model ◽  
Comparative Analysis ◽  
Unmanned Aerial Vehicles ◽  
Control Systems ◽  
Velocity Vector ◽  
Flight Altitude ◽  
Servo Drive ◽  
Automatic Control Systems ◽  
Aerial Vehicles ◽  
Aerial Vehicle

The article discusses a mathematical model of wind, taking into account its stochastic component and wind of a steady direction, presents the results of a comparative analysis of the effect of wind parameters on the total wind velocity vector acting on unmanned aerial vehicles (UAV). The main non-line arities of the autopilot servo elements and their influence on the output signal are considered. The reaction of the contour of the UAV flight altitude stabilization to the wind is considered, taking into account the nonlinearity of the servo drive elements. Proved the need to take into account the wind in the synthesis of automatic control systems (ACS) and the contours of the angular stabilization of the drone at stages where the flight speed of the drone is less than 30 m / s.

scholarly journals DYNAMICS OF ASYNCHRONOUS ELECTRIC DRIVE WITH PID-SIMILAR FUZZY CONTROLLER FOR WATER SUPPLY SYSTEMS

InterConf ◽  
2021 ◽  
pp. 190-196
Author(s):  
Ivan Biliuk ◽  
Leonid Buhrim ◽  
Serhii Havrylov ◽  
Oleh Savchenko ◽  
Guodong Shen
Keyword(s):  
Water Supply ◽  
Electric Drive ◽  
Fuzzy Controller ◽  
Supply System ◽  
Water Supply Systems ◽  
Pump Unit ◽  
Mathematical Application ◽  
Asynchronous Electric Drive ◽  
Supply Systems

in presented paper the transient characteristics of an asynchronous electric drive of a pump unit with PID-similar fuzzy controller are investigated. A comparative analysis of control quality in a system with traditional and fuzzy controllers is performed. The use of fuzzy controller in the asynchronous electric drive of the pump unit for water supply system is substantiated and it is proved that the use of fuzzy logic leads to the improvement of the quality of the transient process of the system. The simulation was performed using the Scilab mathematical application package.

scholarly journals MATHEMATICAL MODELING OF HYBRID VEHICLE’S RECUPERATION BRAKING MODE

2020 ◽  
pp. 182-187
Author(s):  
Liu Na
Keyword(s):  
Mathematical Model ◽  
Automatic Control ◽  
Control Systems ◽  
Control Object ◽  
Simulation Models ◽  
Hybrid Vehicle ◽  
Hybrid Vehicles ◽  
Automatic Control Systems ◽  
Different Types ◽  
Simulation Results

The paper considers the synthesis of mathematical model of recuperation braking mode for hybrid vehicle as a complex control object. The results of computer simulation as diagrams of transients of different operating parameters of hybrid vehicle power system are obtained on the basis of developed model. The analysis of simulation results confirms the adequacy of the mathematic model of the recuperation braking mode of hybrid vehicle to real processes. The developed model can be used for synthesis of automatic control systems of the electric motors, power converters, power supplies and chargers for hybrid vehicles. Hematical and simulation models of the hybrid vehicle’s recuperation braking mode is carried out. The presented models are based on equations of physics of processes and allow to study the recuperation braking mode of the different types hybrid vehicles under various conditions and parameters values (initial linear vehicle’s speed, electrical power of generator, inclination angle and the quality of the road surface, etc.). The designed mathematical model has a rather high adequacy to the real processes, which take place in the hybrid vehicles in the recuperation braking mode, that is confirmed by the obtained simulation results in the form of graphs of transients of the main variables changes. Further research should be conducted towards the development of the functional structures, control devices as well as software and hardware for automatic control systems of the different types hybrid vehicles on the basis of the obtained mathematical and simulation models.

scholarly journals Energy efficient water pumping installation on the basis of frequency-regulated electric drive

2021 ◽  
pp. 81-96
Author(s):  
P. Klendiy ◽  
◽  
L. Kolodiychuk ◽  
O. Dudar ◽  
◽  
...  
Keyword(s):  
Water Supply ◽  
Control Systems ◽  
Water Consumption ◽  
Electric Drive ◽  
Water Losses ◽  
Automatic Control Systems ◽  
Operating Modes ◽  
Water Pumping ◽  
Unit Energy ◽  
Pumping Units

Electric pumping units are not characterized by optimal operating modes and today are energy-intensive technologies. Water consumption is determined by unevenness and is formed under the influence of many, often uncontrollable factors. The inconsistency of the planned water supply regime with the actual water consumption leads to excessive pressures, which causes not only direct overconsumption of electricity at pumping stations, but also increases the likelihood of accidents in the network, contributes to greater water losses due to leaks in the water supply network. additional overconsumption of electricity consumed by pumping units to compensate for pressure loss. With the right choice of electric pump unit, its mechanical characteristics and power of the motor are designed to provide the required pressure in the system at maximum water consumption (morning and evening). At other times of the day, due to the decrease in water consumption, the pressure in the system increases and it is necessary to cover the throttle valve, and this requires constant rotation near it and is accompanied by electricity losses. In electric pumps, which are equipped with an unregulated electric drive, the flow control is carried out in almost the only traditional way - throttle on the discharge side. The paper reveals the need for transition from throttle control systems of pump units to automatic control systems by automatically maintaining the required technological parameter, in particular, the pressure at the flow rate of changing water due to the use of frequency-regulated asynchronous electric drives. Keywords: water pumping unit, energy consuming technologies, throttling, frequency-regulated electric drive

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