scholarly journals Investigation of Electromagnetic Influence on the Liquid Heart of Aluminium Ingots at Continuous Casting in a Direct Chill Mold

2019 ◽  
pp. 952-961
Author(s):  
Mikhail V. Pervukhin ◽  
Mikhail Y. Kuchinskii ◽  
Sergei P. Timofeev
Keyword(s):  
Mathematical Model ◽  
Continuous Casting ◽  
Physical Modeling ◽  
Direct Chill ◽  
Power Line ◽  
Frequency Range ◽  
Electromagnetic Process ◽  
Chill Mold ◽  
Mathematical And Physical Modeling ◽  
The Mathematical Model

The mathematical model of system "inductor-ingot" for investigation electromagnetic process at the continuous casting of aluminum ingots in a direct chill mold is considered in this article. Calculation at various parameters of a power line is made, electromechanical characteristics of stirrer are found. The frequency range at which electromagnetic influence of an inductor on a liquid heart of an ingot is most effective is established. The results of mathematical and physical modeling which have shown reliability of mathematical model are compared

Optimal Design of Dynamic Secondary Cooling of Continuous Casting

2012 ◽  
Vol 472-475 ◽  
pp. 1907-1910
Author(s):  
Yi Wang ◽  
Xin Jian Ma
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Finite Element ◽  
Continuous Casting ◽  
Cooling System ◽  
Solidification Process ◽  
Element Model ◽  
Secondary Cooling ◽  
The Mathematical Model ◽  
The Finite Element Model

Numerical simulation of the secondary cooling is applied to the design of continuous casting. The mathematical model for solidification process of the strand under air-mist was established and calculated with the finite element model. The model is used to calculate the feasible operating range of the continuous casting machines. The dynamic secondary cooling system has been analyzed with consideration of the thermo mechanical principles and numerical model. The adequacy of the model has been confirmed with experimental results.

Mathematical Simulation of Concrete Fatigue Strength under Cyclic Loading

2014 ◽  
Vol 1061-1062 ◽  
pp. 751-756
Author(s):  
Galina G. Kashevarova ◽  
Yuri E. Kurbatov ◽  
Roman V. Sevastyanov
Keyword(s):  
Mathematical Model ◽  
Physical Modeling ◽  
Numerical Experiments ◽  
Damage Accumulation ◽  
Applied Load ◽  
Concrete Material ◽  
Fatigue Characteristics ◽  
Mathematical And Physical Modeling ◽  
Building Designs ◽  
Different Levels

The problem of forecasting the durability of structures, buildings and constructions is one of the most urgent and important tasks in building sphere. In this paper, the authors propose a mathematical model of damage accumulation for the numerical simulation of the fatigue life of concrete. The results of numerical experiments with different levels of the applied load to the model are given, the fatigue characteristics of concrete material - Wohler curve - is built. On the basis of the developed method, the algorithm for research building designs using mathematical and physical modeling is formulated.

scholarly journals Physical modeling of a skip pneumatic winder

2021 ◽  
pp. 64-73
Author(s):  
Aleksandr Leontiev ◽  
Keyword(s):  
Mathematical Model ◽  
Physical Modeling ◽  
Aerodynamic Characteristics ◽  
Volumetric Efficiency ◽  
Similarity Criteria ◽  
Experimental Sample ◽  
Point Analysis ◽  
Analytical Phase ◽  
The Mathematical Model ◽  
Parameters Calculation

Introduction. The analytical phase of research on mine skip pneumatic winders has been passed, so the theoretical provisions have to be tested by the methods of physical modeling which is aimed at confirming the mathematical model adequacy and assessing the effectiveness of different types of sealing devices. Research methods. Physical modeling phases have been formulated, including modeling by geometric and aerodynamic similarity criteria, constructing aerodynamic characteristics of the installation, carrying out experiments with non-contacting and combined seals, and calculating the values of the installation volumetric efficiency based on the experimental data obtained. Research results. The lifting time of the skip model with different masses of material and seal types has been determined. The installation working points in the “flow rate–pressure” coordinate system have been identified, and the values of the volumetric efficiency have been calculated for each working point. Analysis of the results. A satisfactory convergence of calculated and experimental parameters of the physical model has been established. The model's volumetric efficiency has reached a technically acceptable level. The expected value of the experimental model’s volumetric efficiency has been calculated according to the similarity constants. Conclusions. The model's study revealed the convergence of the experimentally obtained volumetric efficiency of the model with its calculated values and proved the applicability of the mathematical model to experimental sample parameters calculation. The volumetric efficiency of the installation with both non-contacting and combined seals is quite high allowing to recommend the studied sealing devices for mine pneumatic winders.

Developing of an Active Hydraulic Bushing for Multi-Displacement Engines

2006 ◽  
Author(s):  
S. Arzanpour ◽  
M. F. Golnaraghi
Keyword(s):  
Mathematical Model ◽  
Research Effort ◽  
Dynamic Stiffness ◽  
Excitation Frequency ◽  
Feedback Signal ◽  
Frequency Range ◽  
Engine Mount ◽  
Isolation Requirements ◽  
Stiffness And Damping ◽  
The Mathematical Model

This paper outlines the development of an active hydraulic bushing system for the Multi Displacement System (MDS) Engine isolation problems. The prior art research effort on engine mounts and bushings has so far focused on the improvement of the mount dynamic stiffness properties. The optimum dynamic stiffness and damping of the engine bushings is both frequency and amplitude dependent. While these systems are available commercially, they have many limitations, particularly for new vehicle models and new engine generations such as MDS engines. A suitable isolator for an MDS engine should be half as stiff in the operating frequency range of the engine (5-70 Hz) in MDS mode, while showing the same performance as conventional hydraulic bushings in normal engine operations. Passive hydraulic bushings are not capable of meeting the isolation requirements discussed for the MDS engines because they are not adjustable. There are different parameters which contribute to the dynamic stiffness response of a hydraulic bushing. Some of those parameters are defined by passive components such as rubber stiffness and damping. However, other parameters such as the pressure inside the bushing can be altered actively. The mathematical model of a conventional hydraulic bushing is given in this paper. The model suggests that the pressure inside the bushing has a significant role in the dynamic stiffness response of the bushing. As a result, an additional pumping chamber is introduced as a solution. The pump is utilized to adjust the pressure inside the bushing based on the engine excitation frequency. This pump can be driven by proper actuators which can produce pressure differences in the frequency range of interest. The mechanical and mathematical model of such a system is derived using a simplified linear model. This technique enables the engine mount to adjust to the dynamic stiffness characteristics by applying a feedback signal to the actuator. The feedback signal to the actuator is also obtained using the mathematical model for many required cases yet adjustable for others. The response of the system is discussed in frequency domains. The simulation results prove that the additional pumping chamber can effectively be used to control the stiffness of the conventional hydraulic bushings.

Mathematical and Physical Modeling of Soft Cobbing Process of Hot Rolling Steels

2011 ◽  
Vol 704-705 ◽  
pp. 160-164 ◽  
Author(s):  
Igor Mazur ◽  
Tanya I. Cherkashina
Keyword(s):  
Experimental Investigation ◽  
Numerical Modeling ◽  
Liquid Metal ◽  
Continuous Casting ◽  
Hot Rolling ◽  
Physical Modeling ◽  
Strain State ◽  
Rolled Metal ◽  
Mathematical And Physical Modeling ◽  
Plasticine Models

The soft cobbing, used in steel’s continuous casting, is widely applying in technologies of rolled metal manufacturing. It is important to know ingot’s stress-strain state and dynamics of ingot’s changes while cobbing, when there is a liquid metal in the centre of section. The complex questions of numerical modeling of soft cobbing process and experimental investigation on physics plasticine models are considered in presented work. The analysis of findings is presented in the article.

scholarly journals Theoretical and Experimental Investigation of Shock Wave Stressing of Metal Powders by an Explosion

2010 ◽  
Vol 5 (3) ◽  
pp. 71-78
Author(s):  
Andrey E. Buzyurkin ◽  
Evgeny I. Kraus ◽  
Yaroslav L. Lukyanov
Keyword(s):  
Shock Wave ◽  
Physical Modeling ◽  
Experimental Investigations ◽  
Powder Materials ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Metal Powders ◽  
Experimental Assembly ◽  
Mathematical And Physical Modeling ◽  
The Mathematical Model

Joint theoretical and experimental investigations have allowed to realize an approach with use of mathematical and physical modeling of processes of a shock wave loading of powder materials. Hugoniot adiabats of the investigated powder have been measured with a noncontact electromagnetic method. The mathematical model of elastic-plastic deformation of the powder media used in the investigation has been validated. Numerical simulation of shock wave propagation and experimental assembly deformation has been performed

Sectionalizing and Redundancy of the 0.38 kV Ring Electrical Network

2019 ◽  
Vol 8 (4) ◽  
pp. 15-38 ◽  
Author(s):  
Alexander Vinogradov ◽  
Alina Vinogradova ◽  
Vadim Bolshev ◽  
Alexander Ivanovich Psarev
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Load Transfer ◽  
Power Line ◽  
Electrical Network ◽  
Phase Coordinates ◽  
The Mathematical Model ◽  
Voltage Indicator

The use of power line sectionalizing and power line redundancy in 0.38 kV networks entails the need to take into account the fact that currents and voltages can vary significantly at different points of the network. The article proposes a mathematical model to solve this problem. The mathematical model is based on the method of phase coordinates. Using mathematical modeling, the article determines the voltages and currents in the sections of the backup line after the automatic load transfer switch is activated. The article also proposes an improvement in the scheme of the power line sectionalizing unit. The sectionalizing unit scheme is suggested to be modified with a bypass circuit and the installation of a voltage indicator for signaling the voltage presence on the lower contacts of the switch.

Direct Chill Mold of Original Design for the Continuous Casting of Complex-Alloyed Brasses and Bronzes

Metallurgist ◽  
2015 ◽  
Vol 59 (5-6) ◽  
pp. 431-434
Author(s):  
I. P. Kleinbug ◽  
L. M. Zheleznyak ◽  
S. I. Parshakov ◽  
E. N. Belonosova
Keyword(s):  
Continuous Casting ◽  
Direct Chill ◽  
Original Design ◽  
Chill Mold
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