THE CALCULATION OF THE LOADED TRANSMISSION CAPACITY OF THE DESIGNED HYDRAULIC SYSTEM

2016 ◽  
Vol 8 (3) ◽  
pp. 64-70
Author(s):  
Мезенцев ◽  
A. Mezentsev ◽  
Сазонова ◽  
Svetlana Sazonova
Keyword(s):  
Iterative Algorithm ◽  
Hydraulic System ◽  
Analytical Calculation ◽  
Flow Distribution ◽  
Transmission Capacity ◽  
System Control ◽  
System Of Equations ◽  
Mode Of Operation ◽  
Functional Reduction ◽  
Nominal Mode

Used approximation conversion method of the system of equations that defines the conditions of extremum for the analytical calculation of the loaded transmission capacity of the designed hydraulic system. Control action in the iterative algorithm is set in the key settings that you previously found limited consumption and hydraulic ha-the characteristics connected subscriber subsystems. Their tuning is performed according to the analysis of the flow distribution in the nominal mode of operation of systems according to the principles of functional reduction.

THE FORMALIZATION OF VARIATIONAL PROBLEM MODELING IN THE CURRENT DISTRIBUTION IN THE SAFE OPERATION OF HYDRAULIC SYSTEMS

2016 ◽  
Vol 8 (4) ◽  
pp. 46-49
Author(s):  
Мезенцев ◽  
A. Mezentsev ◽  
Сазонова ◽  
Svetlana Sazonova
Keyword(s):  
Mathematical Models ◽  
Variational Problem ◽  
Current Distribution ◽  
Hydraulic System ◽  
Transient Flow ◽  
Flow Distribution ◽  
Safety Performance ◽  
System Of Equations ◽  
Hydraulic Systems ◽  
Safe Operation

For the calculated area of the hydraulic system is considered a sequence of formation of mathematical models of flow distribution. The solution of the variational problem allows to obtain a system of equations describing the transient flow regime for the protection of objects of management tasks in safety performance.

THE CALCULATION OF THE UNLOADED TRANSMISSION CAPACITY OF THE DESIGNED HYDRAULIC SYSTEM

2016 ◽  
Vol 8 (3) ◽  
pp. 77-81
Author(s):  
Сазонова ◽  
Svetlana Sazonova ◽  
Мезенцев ◽  
A. Mezentsev
Keyword(s):  
Approximation Algorithm ◽  
Hydraulic System ◽  
A Priori ◽  
Transmission Capacity ◽  
System Of Equations ◽  
Hydraulic Systems

For the formation of the unloaded reserve functioning of hydraulic systems can be applied approximation algorithm. Thus it is necessary to ensure the consistency of the system of equations consists in the fact that the number of manageable nodes in the parameters of limited consumption must match the number of bypass lines, the diameters of which are to be determined. Once movement of these lines is not involved in the formalization of ass-Chi, so their rational configuration can be obtained on the basis of the study of a priori given set of options.

Methodology Development for Transient Flow Distribution Analysis in High Temperature Gas-Cooled Reactor

2020 ◽  
Author(s):  
Takeshi Aoki ◽  
Hiroyuki Sato ◽  
Hirofumi Ohashi
Keyword(s):  
High Temperature ◽  
Hydraulic System ◽  
System Analysis ◽  
Molecular Diffusion ◽  
Transient Flow ◽  
Flow Distribution ◽  
Distribution Analysis ◽  
Design Improvement ◽  
Air Ingress ◽  
High Temperature Gas

Abstract In the thermal hydraulic design of the prismatic-type of the high temperature gas cooled reactor (HTGR), unintended flows such as gap flows between columns, cross flows between column layers and gap flows between permanent reflectors should be analyzed to minimizing the unintended flows. The flow distribution considering unintended flows in the reactor has been evaluated for steady and conservative condition. On the other hand, the transient thermal hydraulic analysis for satisfactorily realistic conditions will be helpful for the design improvement of prismatic-type HTGR. The present study aims to improve the thermal hydraulic system analysis code developed by Japan Atomic Energy Agency based on the RELAP5/MOD3 code and confirm its applicability for the transient flow distribution analysis for prismatic-type HTGRs during anticipated operational occurrences and accidents for its design improvement utilizing experiences on high temperature engineering test reactor (HTTR) design. The calculation model and code were developed and validated to evaluate the detailed flowrate distribution considering the unintended flows in the core and the molecular diffusion that is important to analyze beginning air ingress behavior in an air ingress accident triggered by a rupture of a primary coolant piping in HTGR. It is concluded that a prospect has confirmed to apply the improved thermal hydraulic system analysis code for transient flow distribution analysis for prismatic-type HTGRs.

scholarly journals Inductive analysis of the deflection of a beam truss allowing kinematic variation

2018 ◽  
Vol 239 ◽  
pp. 01012
Author(s):  
Mikhail Kirsanov ◽  
Evgeny Komerzan ◽  
Olesya Sviridenko
Keyword(s):  
Optimal Design ◽  
External Load ◽  
Analytical Calculation ◽  
System Of Equations ◽  
Number Of Solutions ◽  
Recurrence Equations ◽  
General Terms ◽  
Cutting Out ◽  
Selection Of ◽  
Inductive Analysis

A scheme of a statically determinate planar truss is proposed and an analytical calculation of its deflection and displacement of the mobile support are obtained. The forces in the rods from the external load, uniformly distributed over the nodes of the lower or upper belt, are determined by the method of cutting out nodes using the computer mathematic system Maple. In the generalization of a number of solutions of trusses with a different number of panels to the general case, the general terms of the sequence of coefficients in the formulas are found from solutions of linear homogeneous recurrence equations. To compose and solve these equations, Maple operators were used. In the process of calculation it was revealed that for even numbers of panels in half the span, the determinant of the system of equations degenerates. This corresponds to the kinematic degeneracy of the structure. The corresponding scheme of possible speeds of the truss is given. The displacement was determined by the Maxwell-Mohr’s formula. The graphs of the obtained dependences have appreciable jumps, which in principle can be used in the selection of optimal design sizes.

NEW AUTOMATIC IMPULSE EXTINGUISHING DEVICE

Transport ◽  
2008 ◽  
Vol 23 (2) ◽  
pp. 124-128
Author(s):  
Vladimiras Suslavičius ◽  
Marijonas Bogdevičius
Keyword(s):  
Hydraulic System ◽  
Water Surface ◽  
Hyperbolic Type ◽  
System Of Equations ◽  
Water Surface Area ◽  
Characteristics Method ◽  
Hydrodynamic Processes ◽  
Atomize Water ◽  
In Fire ◽  
The Mathematical Model

A simple way to increase the extinguishing water surface area is to atomize water into fine drops. The smaller drops are developed, the better use of water properties can be implemented and less water is consumed in fire fighting. The automatic impulse extinguishing is created. The main aim of the investigation is to develop the approach to investigate the dynamic and hydrodynamic processes in the extinguishing device. The mathematical model of the extinguishing device is presented, where the flow of liquid and gas and the interaction of liquid with the gas are taken into account. The flow of fluids in a hydraulic system is described by a system of equations of a hyperbolic type, which is solved by a characteristics method. An instance of the mathematical simulation of the activity of extinguishing device is shown.

scholarly journals HYDRAULIC MODELS IN THE PROBLEMS OF THERMAL POWER PLANT AUXILIARY ENERGY EFFICIENCY IMPROVEMENT

2021 ◽  
pp. 36-42
Author(s):  
V. Vanin ◽  
M. Kruhol
Keyword(s):  
Energy Efficiency ◽  
Hydraulic System ◽  
Power Plants ◽  
Control Method ◽  
Guide Vane ◽  
Thermal Power ◽  
Operation Mode ◽  
Weighted Average ◽  
System Of Equations ◽  
Operating Characteristics

The work is devoted to the study of thermal power plants auxiliary energy efficiency. The main mechanisms in the auxiliary systems are centrifugal mechanisms that work in complex hydraulic networks with variable productivity. The main ways to adjust the parameters of the centrifugal mechanisms are to change the speed of rotor rotation, change the guide vane angle and throttle. The operation mode of a complex hydraulic network which includes a group of centrifugal mechanisms with a mixed connection scheme is analyzed. The system of equations which characterize the hydraulic system has been obtained on the basis of Kirchhoff's laws. The centrifugal mechanisms' operating characteristics are given by approximation dependences obtained with the method of least squares and similarity laws. To analyze efficiency of different methods of centrifugal mechanisms parameters regulation, optimal control problems were set and solved. The constraints for the problems are a system of equations that describe the hydraulic system operation and technical constraints that depend on the control method. Through solving the problems, values of the optimal parameters and weighted average efficiency of the group mechanisms were obtained. Studies have shown that the most effective way to regulate the centrifugal mechanisms parameters is to use an individual frequency drive, the least effective is to use only changing angle of centrifugal mechanism's guide vane. Utilization of group control is highly efficient and not inferior to individual frequency drive. However, this statement is correct under condition of the operating characteristics agreement with the centrifugal mechanisms’ operating modes similarity.

scholarly journals Analytical calculation of the deflection of an externally statically indeterminate lattice truss

2019 ◽  
Vol 265 ◽  
pp. 05027
Author(s):  
Mikhail Kirsanov ◽  
Evgeny Komerzan ◽  
Olesya Sviridenko
Keyword(s):  
Arbitrary Number ◽  
Analytical Calculation ◽  
Linear Recurrence ◽  
System Of Equations ◽  
Induction Method ◽  
Particular Solutions ◽  
Recurrence Equations ◽  
Nonmonotonic Character

A scheme of a statically definable truss with additional supports is proposed. Derive formulas for the dependence of the deflection of the truss against the number of panels for three types of symmetrical loads. It is shown that for definite numbers of panels the determinant of the system of equations for the equilibrium of nodes degenerates. This indicates an instant changeability of the structure. To generalize particular solutions to an arbitrary number of panels, the induction method is applied. For this purpose, in the computer mathematics system Maple linear recurrence equations are constructed for the terms of a sequence of coefficients from individual solutions. The graphs of the dependences obtained indicate a nonmonotonic character of the solutions found and the possibility of optimizing the design by choosing the number of panels.

THE DECOMPOSITION APPROACH AND THE CONDITIONS OF UNIQUENESS IN THE SIMULATION OF HYDRAULIC SYSTEMS

2016 ◽  
Vol 8 (3) ◽  
pp. 74-77
Author(s):  
Сазонова ◽  
Svetlana Sazonova
Keyword(s):  
Boundary Conditions ◽  
Hydraulic System ◽  
Zone Model ◽  
Hydraulic Systems ◽  
Decomposition Approach ◽  
Basic Model ◽  
Functional Reduction ◽  
Secondary Zone ◽  
Fourth Form ◽  
The Relationship

In practice, there are three forms of boundary conditions. The feature of the fourth form of the boundary conditions is that the relationship between the above nodal parameters before solving the problem cannot be defined neither in form nor in content. This situation occurs when the decomposition of the hydraulic system. The basis of this mechanism is to transform the basic model estimated in the secondary zone model based on the method of functional reduction. This method is essentially a synthesis of the known methods of transformation models based on the ideas of reduction, diakoptic and cybernetic modeling.

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