Research on the Metrological Characteristics and Voltage Transformer with Open Core Antiresonance Properties

2014 ◽  
Vol 698 ◽  
pp. 160-167
Author(s):  
Vladimir D. Lebedev ◽  
Andrey A. Yablokov
Keyword(s):  
Mathematical Modeling ◽  
High Voltage ◽  
Metrological Characteristics ◽  
Voltage Transformer ◽  
Research Results ◽  
Phase Errors ◽  
Instrument Transformers ◽  
Calculation Results ◽  
Open Core ◽  
Amplitude And Phase Errors

This work presents research results of open core high-voltage instrument transformers. The authors proposed different transformer constructions (designs) and implemented mathematical modeling on the basis of specially developed computer models carrying out field and circuit calculations simultaneously. According to the calculation results, the investigated voltage transformer amplitude and phase errors are defined. Also, research results of the investigated transformer antiresonance properties on the basis of symbolic models are given.

MODELING THE HYDRAULIC CHARACTERISTICS OF DRAIN VALVE AND BURST FITTING OF AN AIRCRAFT ACCIDENT-RESISTANT FUEL SYSTEM

2020 ◽  
Vol 7 (3) ◽  
pp. 37-44
Author(s):  
KONSTANTIN NAPREENKO ◽  
◽  
ROMAN SAVELEV ◽  
ALEKSEY TROFIMOV ◽  
ANNA LAMTYUGINA ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic Resistance ◽  
Hydraulic Calculation ◽  
Fuel System ◽  
Hydraulic Characteristics ◽  
System A ◽  
Ansys Cfx ◽  
Calculation Results ◽  
Scale Experiment ◽  
Aircraft Accident

The article discusses methods for determining the hydraulic resistance of units of an accident-resistant fuel system. A detailed description of the need to create such fuel systems for modern helicopters is given. The development of such systems today is impossible without the use of the method of mathematical modeling, which allows to qualitatively solve problems arising in the design process. To obtain accurate research results, it is necessary to have a complete description of all elements and assemblies of the system. Methods for determining the hydraulic characteristics of AFS elements using the drag coefficient, reference literature and CFD codes are considered. As the investigated AFS units, a drain valve and burst fitting were studied in the article. A hydraulic calculation of these AFS elements ware performed, the simulation results are presented in the ANSYS CFX software package. Also as the calculation results of bursting fitting, the pressure distribution fields of full and static pressure, velocity and streamlines are also shown. An experimental setup for validating the results obtained using the mathematical modeling method is considered, as well as a methodology for conducting a full-scale experiment to determine the hydraulic resistance of the unit. Materials have been prepared for inclusion in a one-dimensional mathematical model of an accident-resistant fuel system.

Amplitude and Phase Errors Calibration of the Satellite-Borne DBF Transmitting RF Channel

2011 ◽  
Vol 30 (9) ◽  
pp. 2182-2184 ◽  
Author(s):  
Hong-mei Zhao ◽  
Hua-li Wang ◽  
Shan-xiang Mu ◽  
Zhong-chuan Zhang ◽  
Cheng-guo Li
Keyword(s):  
Phase Errors ◽  
Amplitude And Phase Errors

The Development of Precision 500/√3 kV Two-Stage Voltage Transformer with High-Voltage Excitation

2021 ◽  
pp. 1-1
Author(s):  
Hao Liu ◽  
Feng Zhou ◽  
Lixue Chen ◽  
Min Lei ◽  
Xiaodong Yin ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Transformer ◽  
Two Stage

Assessment of Certainty of Ventilation Processes Mathematical Modeling

2015 ◽  
Vol 725-726 ◽  
pp. 1255-1260
Author(s):  
Tamara Daciuk ◽  
Vera Ulyasheva
Keyword(s):  
Mathematical Modeling ◽  
Turbulent Flows ◽  
Turbulence Models ◽  
Field Measurements ◽  
Heat Emission ◽  
Emission Sources ◽  
Wide Range ◽  
Calculation Results ◽  
Definition Of ◽  
Semiempirical Models

Numerical experiment has been successfully used during recent 10-15 years to solve a wide range of thermal and hydrogasodynamic tasks. Application of mathematical modeling used to design the ventilation systems for production premises characterized by heat emission may be considered to be an effective method to obtain reasonable solutions. Results of calculation performed with numerical solution of ventilation tasks depend on turbulence model selection. Currently a large number of different turbulence models used to calculate turbulent flows are known. Testing and definition of applicability limits for semiempirical models of turbulence should be considered to be a preliminary stage of calculation. This article presents results of test calculations pertaining to thermal air process modeling in premises characterized by presence of heat emission sources performed with employment of different models of turbulence. Besides, analysis of calculation results and comparison with field measurements data are presented.

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