scholarly journals МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ ЭЛЕКТРОНАГРЕВНОЙ ДВИГАТЕЛЬНОЙ УСТАНОВКИ В ФОРМИРОВАНИИ МИКРОСПУТНИКОВОЙ ГРУППИРОВКИ

2018 ◽  
pp. 45-51
Author(s):  
Андрей Владимирович Погудин
Keyword(s):  
Mathematical Model ◽  
Transfer Functions ◽  
Block Diagram ◽  
Rocket Engine ◽  
Control Unit ◽  
Electric Heating ◽  
Propulsion System ◽  
Working Fluid ◽  
Space Vehicles ◽  
The Mathematical Model

The subject of the study in the article is the mathematical model of the propulsion system. It is built on the basis of the formed transfer functions of the elements. The goal is to rationalize the process of heating the onboard propulsion system on the basis of mathematical model under given constraints. Tasks: formalization of processes in an electric heating engine with a working body ammonia; formalization of the model of the onboard propulsion system; formation of the structural scheme; consideration of physical processes occurring in the nodes of the propulsion system; description of gas and hydraulic processes; the description of thermodynamic and electrokinetic processes; The construction of a mathematical model based on transfer functions. The methods used are: models of transfer functions of a tank, a filter, a steam generator, a receiver and a jet, an engine with their ranges of work. The following results are obtained. A block diagram of the onboard propulsion system was added, supplemented with a control unit and a power supply system. A formalized mathematical model of an onboard propulsion system with working body ammonia is created. From it formed a model consisting of the key elements that make up the onboard propulsion system, which is used when rationalizing the heating of the working fluid. The scientific novelty of the results is as follows. The mathematical model of the electro-heating propulsion system onboard small space vehicles has been further developed through its application to calculate the traction characteristics of the dispenser, which makes it possible to use an ammonia electric heating rocket engine in the formation of a constellation of satellites. The limitations of the operating parameters of the model are introduced. It was proposed to conduct the further workability of the model in Matlab Simulink. Thus, a rational value of the current and voltage parameters will be obtained, at which the time of the system's output to the operating mode will be minimal, and the thrust is maximum for the given operating temperature and pressure ranges

Dynamics of Working Processes in Automatic Direct-Acting Pressure Regulators of Pneumatic Spacecraft Systems

2021 ◽  
pp. 65-76
Author(s):  
A.V. Lebedev ◽  
A.V. Chernyshev ◽  
Y.V. Kyurdzhiev ◽  
A.P. Mitrofanov ◽  
O.S. Ilicheva ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Software Package ◽  
Block Diagram ◽  
Working Fluid ◽  
Pressure Regulator ◽  
Conservation Of Energy ◽  
General Mathematical Model ◽  
Direct Acting ◽  
The Mathematical Model ◽  
Working Processes

The purpose of the study was by means of modern software to explore working processes taking place in automatic direct-acting pressure regulators of pneumatic spacecraft systems. As a result, we developed a general mathematical model of the pressure regulator. The design of the regulator is shown in the form of a block diagram, composed of a set of channels, cavities, and stages. The elements of the block diagram are interconnected by the basic laws of conservation of energy and mass. The mathematical model was evaluated in the Amesim software package. Findings of the full-scale and computational experiments led to the conclusions about the effect the heat exchange between the working fluid and the environment produces on the parameters of the pressure regulator, and about the use of the Amesim software package for further research of working processes in the valve units of pneumatic systems.

Research on Application of UPQC in Electric Vehicle Charging Equipment

2015 ◽  
Vol 734 ◽  
pp. 852-857
Author(s):  
Cheng Gong ◽  
Rui Shi ◽  
Zhong Jun Chi ◽  
Bao Qun Zhang ◽  
Long Fei Ma ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Electric Vehicle ◽  
Power Quality ◽  
Control Unit ◽  
Current Control ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Reference Parameters ◽  
Research On Application ◽  
The Mathematical Model

In order to improve the power quality problems caused by electric vehicle charging equipment, this paper put forward the research on Application of Unified Power Quality Controller (UPQC) in the charging field. Based on the mathematical model of UPQC, current control unit with state feedback single loop PI controller and voltage control unit based on dual PI loop controller are designed. Based on the mathematical model, the design reference parameters are derived. Finally, a UPQC prototype is developed and experiment is carried out, results show that UPQC has good application prospect in the field of electric vehicle charging.

Performance Analysis of a Solar-Assisted Organic Rankine Cycle

2020 ◽  
Author(s):  
M. T. Nitsas ◽  
I. P. Koronaki
Keyword(s):  
Mathematical Model ◽  
Performance Analysis ◽  
Temporal Variation ◽  
Storage Tank ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Evaporation Temperature ◽  
Solar Powered ◽  
The Mathematical Model

Abstract The objective of this paper is the thermodynamic analysis of a solar powered Organic Rankine Cycle (O.R.C.) and the investigation of potential working fluids in order to select the optimum one. A dynamic model for a solar O.R.C. with a storage tank, which produces electricity is developed. The mathematical model includes all the equations that describe the operation of the solar collectors, the storage tank, the Rankine Cycle and the feedback between them. The model runs for representative days throughout the year, calculating the net produced energy as a function of the selected evaporation temperature for every suitable working fluid. Above that, the temporal variation of the systems’ temperatures, collectors’ efficiency and net produced power, for the optimum organic fluid and evaporation temperature are presented.

Stability of Velocity-Loop-Based Hydraulic Control Loading System

2012 ◽  
Vol 619 ◽  
pp. 472-475
Author(s):  
Pan Guo Qi ◽  
Li Wei Zhao ◽  
Pei Chao Cong ◽  
Hui Wang
Keyword(s):  
Mathematical Model ◽  
Block Diagram ◽  
System Model ◽  
Flight Simulator ◽  
Stability Conditions ◽  
Hydraulic Control ◽  
Function Block ◽  
Loading System ◽  
The Stability ◽  
The Mathematical Model

A hydraulic Control Loading System (CLS) based on velocity-loop was developed and installed on our flight simulator earlier days, but the CLS cannot keep stable in some conditions. This problem is discussed in this paper. The mathematical model of velocity-loop-based CLS is firstly developed with the method of transfer function block diagram. Then, system’s stability conditions are put forward using Roth criterion based on the system model developed. At last, the experiments proves the stability

scholarly journals МИНИМИЗАЦИЯ ВРЕМЕНИ ПОДГОТОВКИ РАБОЧЕГО ТЕЛА К ЗАПУСКУ ДВИГАТЕЛЬНОЙ УСТАНОВКИ С ЭЛЕКТРОНАГРЕВНЫМ ДВИГАТЕЛЕМ

2020 ◽  
pp. 4-11
Author(s):  
Андрей Владимирович Погудин ◽  
Сергей Викторович Губин
Keyword(s):  
Energy Balance ◽  
Power Supply ◽  
Power Supply System ◽  
Electric Heating ◽  
Supply System ◽  
Propulsion System ◽  
Working Fluid ◽  
Start Time ◽  
Start Up ◽  
Limited Power

The subject of the research in the article is the process of preparing the working fluid for launching an engine installation with an electric heating engine. The goal is to minimize the time for preparing the working fluid for launch by developing an algorithm for thermostating and barostating of elements of a propulsion system with limited power of the power supply system. Tasks: analysis of the structure of a propulsion system with an electric heating engine, selection of an installation control controller, the formation of an algorithm for preparing the working fluid for the first launch, the study of the reserve time for preparing the working fluid for launch with limited power supply system, the formation of an algorithm for minimizing the starting time. The methods used are: circuit analysis, energy balance and algorithmic analysis. The following results were obtained: the structural diagram of the propulsion system was analyzed, a control unit based on the Arduino Leonardo controller was selected, the first start-up algorithm was compiled, which consisted of the barostatting of the tank, thermostatting of the steam generator, barostatting of the receiver, and thermostatting of the electric heating engine; A start-up cyclogram with reduced time was constructed, an algorithm with a minimum start-up time of the propulsion system was formed. The scientific novelty of the results is as follows: the procedures included in the algorithm for preparing the working fluid for the first launch of the propulsion system are formed, a cyclogram for preparing the working fluid for the first launch is constructed, a cyclogram for reducing the time for preparing the working fluid for the first launch of the installation is constructed based on the energy balance of power consumption with limitation power plant output parameters, an algorithm for reducing the preparation time of the working fluid for the first launch of a propulsion system with an electric heating engine was built, the value of the start time was established by the modified first start algorithm with limited values of the power supply system.

Influence of pressure distribution in the gap of piston-cylinder unit and properties of working fluid PES-3 on characteristics of high pressure piston-cylinder unit

2020 ◽  
pp. 38-42
Author(s):  
A. E. Aslanyan
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Pressure Range ◽  
Pressure Change ◽  
Working Fluid ◽  
Research Results ◽  
Piston Cylinder ◽  
Pressure Distributions ◽  
The Mathematical Model

A simulation of the use of PES-3 liquid in a high-pressure piston-cylinder units was performed, and the parameters of the piston-cylinder units were determined in the article. The equations of the mathematical model describing the pressure change in the gap between the piston and the cylinder are given. As a result of the calculations, the pressure distributions in the gap between the piston and the cylinder are determined at under piston pressures less than 1.6 GPa. The profiles of the gaps between the deformed piston and cylinder at different under piston pressures are calculated. The dependences of the speed of lowering the piston and the effective gap on the under piston pressure at different gaps of the undeformed piston-cylinder unit are obtained. The research results can be used in the design of piston cylinder units operating on PES-3 liquid in the pressure range of 0.01–1.6 GPa.

TECHNIQUE OF APPLICATION FOR PROCESSING OF LOW PASS FILTER LF SIGNALS

10.12737/7905 ◽  
2015 ◽  
Vol 7 (4) ◽  
pp. 35-38
Author(s):  
Табаков ◽  
Yu. Tabakov ◽  
Лавлинский ◽  
V. Lavlinskiy
Keyword(s):  
Mathematical Model ◽  
Block Diagram ◽  
Low Frequency ◽  
Frequency Signal ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
The Mathematical Model ◽  
40 Hz

The article includes a block diagram and the mathematical model for low pass filter designed for processing low frequency signal with a frequency of 10-40 Hz in order of eliminate various noises and interference.

Influencing Factors Analysis on Regulating Effect of the Pintle Controlled Thrust Regulating Mechanism

2010 ◽  
Vol 44-47 ◽  
pp. 1320-1324
Author(s):  
Lan Ting Zhang ◽  
Hai Qing Cheng ◽  
Li Ming Song ◽  
Jin Shun Yan
Keyword(s):  
Mathematical Model ◽  
Influencing Factors ◽  
Theoretical Foundation ◽  
Rocket Engine ◽  
Structure Design ◽  
Factors Analysis ◽  
Main Factors ◽  
Solid Rocket ◽  
And Control ◽  
The Mathematical Model

Based on the thrust regulating principle of pintle controlled solid-rocket engine, the mathematical model between pintle motion and thrust changing is established, and influence of main factors to thrust regulating effect is analyzed. These results can provide theoretical foundation for structure design and control of pintle controlled thrust regulating mechanism of solid-rocket engine.

Experimental and Theoretic Research on Solar Power Membrane Distillation

2010 ◽  
Vol 97-101 ◽  
pp. 2300-2305
Author(s):  
Hong Jiang Cui ◽  
Pei Ting Sun ◽  
Ming Hai Li
Keyword(s):  
Mathematical Model ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Solar Power ◽  
Membrane Distillation ◽  
Working Fluid ◽  
Air Gap Membrane Distillation ◽  
The Mathematical Model

Air gap membrane distillation experiments of different temperature and mass flow rate of working fluid were done for the use of solar power and setting up the mathematical model of AGMD’ heat and mass transfer. The calculation correctness of mathematical model was discussed and the thermal efficiency of membrane distillation system was calculated. The results showed that the experimental flux of membrane distillation reached 49kg/m2•h and the biggest relative error is less than 9% between results of experiment and mathematical model calculation. The mathematical model can be used to forecast the process parameters of membrane distillation. The highest thermal efficiency of this system is 68% and the main influencing factors of thermal efficiency are temperature and mass flow rate of working fluid.

Mathematic Model of Displacement Control Unit for Screw Distributor of Asphalt Paver

2013 ◽  
Vol 774-776 ◽  
pp. 295-298
Author(s):  
Zhi Nan Mi ◽  
Long An Chen ◽  
Jia Tao Tang
Keyword(s):  
Mathematical Model ◽  
Hydraulic System ◽  
Control Unit ◽  
Mathematic Model ◽  
Displacement Control ◽  
Rotating Speed ◽  
Dynamical Characteristics ◽  
Inertial Element ◽  
The Mathematical Model

Displacement control unit is an important part of hydraulic system for screw distributor. By adjusting the angle of swashplate, it can change the flow rate of pump and rotating speed of screw distributor. The rotating speed of screw distributor has influence on quality of road. The mathematical model of displacement control unit is presented. Its dynamical characteristics are analyzed. The mathematical model includes a reset spring gradient. The reset spring gradient is much smaller than the hydraulic spring rate, the effect of the reset spring gradient can be neglected. So an inertial element can be substituted by an integration element.

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