scholarly journals Влияние термических сопротивлений на холодильный коэффициент термоэлектрической системы охлаждения

2021 ◽  
Vol 91 (5) ◽  
pp. 743
Author(s):  
Е.Н. Васильев
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Power Supply ◽  
Cooling System ◽  
Thermoelectric Module ◽  
Current Strength ◽  
Temperature Control System ◽  
Operating Characteristics ◽  
Optimal Values ◽  
Supply Current

A thermoelectric cooling and temperature control system consisting of a thermoelectric module and devices for supplying and removing heat is considered. Based on a mathematical model that uses the operating characteristics of a serial thermoelectric module as initial data, the cooling coefficient of the cooling system was calculated taking into account the thermal resistances of the devices for supplying and removing heat. The dependences of the cooling coefficient on the current strength for different values of the cooling parameters are obtained. The analysis of optimal values of the power supply current of the thermoelectric module is carried out.

Effect and Simulation on Control System of Boiler Parameters

2013 ◽  
Vol 411-414 ◽  
pp. 1711-1715
Author(s):  
Bing Hua Jiang ◽  
Li Fang ◽  
Hang Biao Guo
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Temperature Control ◽  
Pid Controller ◽  
Static Stability ◽  
Temperature Control System ◽  
Integrated Process ◽  
And Control

In this paper, taking integrated process and control platform as the background , did the research on mathematical model of boiler liner and parameters on the performance of the control system. First, created a mathematical model of the temperature of the boiler liner. Second, selected the PID controller to control the temperature control system in the case of the PID controller parameters remained unchanged. Finally, changed the boiler parameters, analyzed and compared the simulation waveforms of different boiler parameters in order to get the conclusion that different parameters had different influence on the static stability of the temperature control system and the temperature control system had anti-jamming capability.

scholarly journals Regulation of Cooling Mode of Thermoelectric Bloc

2021 ◽  
pp. 416-423
Author(s):  
Evgeniy N. Vasil'ev
Keyword(s):  
Computational Model ◽  
Thermoelectric Module ◽  
Heat Removal ◽  
Current Strength ◽  
Coefficient Of Performance ◽  
Cooling Power ◽  
Algebraic Equations ◽  
Operating Characteristics ◽  
Cooling Mode ◽  
Thermoelectric Refrigeration

With the help of a computational model, the cooling modes of a block of a thermoelectric refrigeration unit designed for ship's provision and freezing chambers are studied. The computational model, based on the numerical solution of a system of nonlinear algebraic equations, takes into account the operating characteristics of a serial thermoelectric module and the thermal resistances of heat removal and supply devices. The dependences of the cooling power and the coefficient of performance of the block on the supply current of the thermoelectric modules are calculated. The analysis of the cooling modes of the thermoelectric block is carried out and recommendations for regulating the current strength depending on the current temperature conditions in the provision and freezing chambers are developed

scholarly journals Modeling the control processes of the size population of microorganisms using modulated microwave

2021 ◽  
pp. 155-161
Author(s):  
Alexander Oshchepkov
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Control System ◽  
Microwave Radiation ◽  
Modulation Frequency ◽  
Dynamic Environment ◽  
Automatic Tuning ◽  
Size Population ◽  
Optimal Values ◽  
The Impact

The paper describes a mathematical model of a control system for the size population of microorganisms using modulated microwave radiation of non-thermal power.The model is implemented in the dynamic environment MATLAB+Simulink, the areas of optimal values of the impact parameters are found. An algorithm for automatic tuning of the modulation frequency during the experiment has been developed.The efficiency of the algorithmis shown with the help of computer simulation.

Modelica-Based Simulation of Fuzzy Temperature Control System in Virtual Experiment

2012 ◽  
Vol 190-191 ◽  
pp. 288-291
Author(s):  
Jian Feng Lu ◽  
Ling Hui Xiao ◽  
Rong Su
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Key Words ◽  
Temperature Control ◽  
Fuzzy Controller ◽  
Simulation System ◽  
Temperature Control System ◽  
Virtual Experiment

A fuzzy temperature control system is modeled and simulated in Modelica language，all of the system is mainly composed of heating tank, heater, fuzzy controller, electric valve and sensor. Every component is modeled separately in OpenModelica and created its MO file which is based on the component’s mathematical model and data parameter, and will be packaged into an xml file by Flex-plugin; finally, these parts are connected to an overall simulation system. The result of simulation is showed that this model is correct, and meets the control demand of fuzzy temperature control system． Key words: Modelica; fuzzy temperature control system; Mo file

The New Model of Laminar Cooling System and its Fieldbus System

2014 ◽  
Vol 941-944 ◽  
pp. 2405-2409
Author(s):  
Hai Fang Wang
Keyword(s):  
Control System ◽  
Control Method ◽  
Cooling System ◽  
System Structure ◽  
Temperature Control System ◽  
Rolled Strip ◽  
Laminar Cooling ◽  
Coiling Temperature ◽  
Intelligent Sensor ◽  
Cooling Control

Hot strip cooling temperature and its cooling rate is get by strip cooling system and coiling temperature of hot rolled strip is an important parameter on its performance index. A clew regarded as the laminar cooling control system is controlled by general linear analytical model. Under detailed analysis of its control system structure, basic theory, analytical method, system design and control method, the structure of the temperature control system is characterized by feed-forward control as the main combined with feed-backward control as the assistant, the configuration software for laminar cooling process is constructed, the mathematics model is present, the characteristic of emerging fieldbus control system is analyzed, and the configuration of fieldbus is brought forward and sketch of distributed structure of laminar cooling control system in a hot rolling mill based on fieldbus and intelligent sensor is presented.

scholarly journals IMPLEMENTATION OF THE METHODS OF IDENTIFICATION OF STATIC CONTROL OBJECTS

2017 ◽  
pp. 72-78
Author(s):  
Sergey Pachkin ◽  
Sergey Pachkin ◽  
Roman Kotlyarov ◽  
Roman Kotlyarov
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Mathematical Description ◽  
Control Object ◽  
Parametric Identification ◽  
Identification Problem ◽  
Temperature Control System ◽  
The Mathematical Model

One of the main tasks solved in the development of automatic control systems is the identification of the control object, which consists in obtaining its mathematical description. The nature and type of the mathematical model is determined by the goals and tasks for which it will be used. In the present case, the aim of obtaining the model is the synthesis of an automatic control system. Proceeding from the requirements of control problems, the identification problem consists in determining the structure and parameters of the mathematical model that ensure the best similarity of the model and object responses to the same input action. The article considers the experimental method of obtaining a mathematical description of the control object based on the results of measuring its input and output parameters and then processing the obtained results. The control object is the EP10 emulator made by the Oven Company, which is a miniature furnace. The emulator is used in experimental research in the process of commissioning using thermostat controls, and also applicable for educational purposes as part of training and research stands. As a result of structural identification with subsequent adjustment of the coefficients with the help of parametric identification, a model of the control object in the form of a second order aperiodic link is obtained. Parameters and type of the mathematical model allowed to make calculations and determine the parameters of adjustment of the TRM251 PID-controller. The software implementation of the automatic control system in the MatLAB environment made it possible to evaluate transient processes in a closed system. Thus, the calculation and analysis of the automatic control system in the first approximation were made. The final result can be obtained at the stage of commissioning the automatic temperature control system in the EP10 emulator using adaptation algorithms.

Design of Injection Mold for a Large LCD TV Panel

2013 ◽  
Vol 423-426 ◽  
pp. 1982-1989
Author(s):  
Jian An Zhou
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Surface Finish ◽  
Cooling System ◽  
Temperature Control System ◽  
Injection Mold ◽  
Working Process ◽  
Assembly Drawing ◽  
Structure Scheme

The overall injection mold structure scheme was determined based on the processing analysis of a large LCD TV panel. Specific heating/cooling system and temperature control system aiming for better surface finish were designed. The runner system, which starts from a pin valve hot runner system and turn to cold runner and then to banana-like gates, was obtained. Lifters used for smooth ejection and pulling side cores were presented. The venting system and the material for the cavity plate were introduced. The assembly drawing was shown and the working process of the mold was described at last.

Comprehensive Calculation of Winding Loss, Fluid and Temperature Field in Large Power Transformer

2014 ◽  
Vol 513-517 ◽  
pp. 3381-3384
Author(s):  
Yong Teng Jing ◽  
Yan Li ◽  
Longnv Li ◽  
Man Hua Jiang ◽  
Ning Wang
Keyword(s):  
Mathematical Model ◽  
Temperature Rise ◽  
Working Condition ◽  
Cooling System ◽  
Power Transformer ◽  
Hydraulic Loss ◽  
Operating Characteristics ◽  
Large Power ◽  
Oil Flow ◽  
Transformer Winding

This paper has make a deep theoretical analysis and experimental research according to the load loss of large capacity transformer which included the loss component decomposition, the analysis of the oil flow cooling system performance and working condition, the stray loss and temperature rise of the winding area. We have done the following work on the background of the 1000kV power transformer: The winding area loss was calculated based on the weight coefficient method and field circuit coupling method; considering that the hydraulic loss of the transformer cooling system is nonlinear and the nonlinear operating characteristics of the oil flow pump, establishing the cooling oil-way mathematical model of the transformers non winding area, and analysis the working condition of the transformer cooling system. Establishing the transformer winding multi-physics coupling mathematical model and researching the transformer winding heat problem based on the nonlinear influence of the material. The error between the windings numerical calculation results and the loss, winding temperature rise meet requirements of the engineering analysis according to this method. The calculation in this paper has high precision, and it can be used in the structure optimization of the large transformer winding.

Automated temperature control system for vagal cooling

1988 ◽  
Vol 65 (1) ◽  
pp. 469-472
Author(s):  
E. J. Cha ◽  
E. Chow ◽  
D. M. Vega ◽  
S. M. Yamashiro
Keyword(s):  
Control System ◽  
Steady State ◽  
Temperature Control ◽  
Rise Time ◽  
Electronic Circuit ◽  
Cooling System ◽  
Temperature Control System ◽  
Present Apparatus ◽  
High Flows ◽  
Vagal Cooling

An automated cooling system for vagal cold blockade was developed. A simple electronic circuit is described that enabled regulation of the steady-state nerve or circulant temperature to within +/- 0.1 degree C by alternating the cold circulant between low and high flows (10 and 350 ml/min, respectively). The 90% rise time ranged from 15 to 40 s depending on the desired steady state and the surrounding temperatures. The present apparatus can be conveniently and safely used, especially for differential vagal cold blockade.

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