scholarly journals Algorithm for computer modeling of combined irrigation systems hydraulic parameters

2021 ◽  
Vol 843 (1) ◽  
pp. 012052
Author(s):  
V V Borodychev ◽  
M N Lytov ◽  
A S Razin
Keyword(s):  
Computer Simulation ◽  
Hydraulic Calculation ◽  
Time Interval ◽  
Hydraulic Parameters ◽  
Irrigation Systems ◽  
Modes Of Operation ◽  
Serial Search ◽  
Operating Modes ◽  
External Conditions ◽  
Irrigation Technologies

Abstract A feature of combined irrigation systems is the integration of various technologies and methods of irrigation with the implementation of such a possibility on the basis of a single technical system. The hydraulic calculation of such systems is more complicated, since it is assumed that it is possible to implement various modes of operation, which differ by the combination of hydraulic parameters. The operating modes are determined by the combination of the involved irrigation technologies carried out simultaneously. The research has proposed an algorithm for the computer simulation of combined irrigation systems hydraulic parameters. The algorithm implements the principle of step-by-step calculation and formation of statistical screenshots of the hydraulic parameters of the system based on the basic calculated dependencies of classical hydraulics. Static screens can be performed at any time interval, which allows to assess the dynamics of the process under changing external conditions, as well as study the system under different operating modes. The algorithm has built an ingenious system of objects identification, making it possible not only to verify the uniquely defined knots of stems section, but also to organize serial search nodal points in accordance with the architecture of the construction of hydro-reclamation systems.

scholarly journals Determining the quantitative parameters of the hydraulic model of combined irrigation systems based on the computer calculations algorithmization

2021 ◽  
Author(s):  
M. N. Lytov ◽  
Keyword(s):  
Quantitative Assessment ◽  
Irrigation System ◽  
Nodal Point ◽  
Computer Algorithm ◽  
Hydraulic Calculation ◽  
Inlet Section ◽  
Hydraulic Parameters ◽  
Irrigation Systems ◽  
Irrigation Methods ◽  
Quantitative Parameters

Purpose: development of a computer algorithm for a quantitative assessment of the hydraulic parameters of an irrigation and drainage system with the possibility of integrating different irrigation methods. Materials and methods. The design of structures for combined irrigation is based on hydraulic calculation. A feature of such systems is the ability to change irrigation methods, which is associated with a significant change in hydraulic parameters and the complication of hydraulic design of structures. Automation of hydraulic calculations based on a universal computer algorithm is the most acceptable way to solve the problem and the basis for designing combined irrigation systems. Results. A feature of the proposed algorithm for determining the quantitative parameters of the combined irrigation system is the use of a step-by-step approach followed by the formation of a generalized hydraulic screenshot of the entire structure. A screenshot of hydraulic parameters here means a quantitative assessment of hydraulic indicators for all nodal points of a structure, implemented by a calculation method for given, stationary modes of system operation. A set of this kind of static screenshots allows you to evaluate the process in dynamics, as well as to carry out comparative assessments of hydraulic parameters under different operating modes of the combined irrigation system. The algorithm offers an original way to identify objects based on the use of a linear coordinate system. The method makes it possible to organize an enumeration of the structural elements of the system and a step-by-step calculation of hydraulic parameters from the inlet section of the design segment to any given nodal point. Conclusions. The calculation results according to the proposed algorithm make it possible to form a specially organized data array, which is a set of symbolic-numeric values that determine the pressure level and water flow rate and identify them with the nodal point of the system.

scholarly journals Hydraulic calculation of irrigation settling tanks of Amu Darya irrigation systems

2021 ◽  
Vol 264 ◽  
pp. 03027
Author(s):  
Kenesbay Baimanov ◽  
Kadirbek Nazarbekov ◽  
Ruslan Baimanov ◽  
Sharap Tazhibayev
Keyword(s):  
Irrigation System ◽  
Hydraulic Calculation ◽  
Normal Operation ◽  
Hydroelectric Power Station ◽  
Left Bank ◽  
Hydroelectric Power ◽  
Irrigation Systems ◽  
Simple Method ◽  
Modes Of Operation ◽  
Amu Darya

The Amu Darya river carries a large amount of up to 15 kg/m3 of suspended matter containing up to 85-90% suspended and 10-15% bottom sediments, which pose a serious threat to the hydroelectric power station and irrigation systems operating in its basin. In case of dam water intake, head sump tanks are provided in the composition of waterworks. So, in the composition of Right-Bank and Left-Bank, sedimentation tanks with mechanical cleaning to protect the channels were built at the Takhiatash hydroelectric complex Kaskelenskaya and Selinsky irrigation system. It is established that the hydraulic and alluvial modes of operation of these settling tanks depend on the water, alluvial, and backwater modes of operation Takhiatash waterworks. It is noted that due to low water conditions, this hydroelectric power plant operated for a significant part of the year with fully closed gates in all spans, producing intensive siltation of the upper stream. These processes led to a change in the alluvial mode of operation of the settling tanks. At the same time, due to low water and excessive design dimensions, in the first years of operation, these settling tanks were heavily silted up, the bottom mark rose to 17.2 m (above the design 165 m). Properly designed settling tanks should prevent siltation of main and distribution channels while respecting the transport capacity of the channels located below. It is proved that some well-known methods for calculating settling tanks, due to their complexity and bulkiness, cannot be used in calculating siltation modes of settling tanks under operational conditions that require simplification or finding a simpler relationship. A simple method is developed for calculating the dynamics of sediment deposition in irrigation sump tanks based on the probability of turbulent pulsation motion. Recommended: for normal operation of irrigation septic tanks, it is necessary to carry out systematic monitoring of the output turbidity and intensity of treatment, as well as water supply according to the water consumption schedule.

Homeowners’ Preferences for Smart Irrigation Systems and Features

EDIS ◽  
2020 ◽  
Vol 2020 (5) ◽  
pp. 5
Author(s):  
Hayk Khachatryan ◽  
Alicia Rihn ◽  
Dong Hee Suh ◽  
Michael Dukes
Keyword(s):  
Water Use ◽  
Water Policy ◽  
Resource Economics ◽  
Irrigation Systems ◽  
Policy Makers ◽  
Fact Sheet ◽  
Drought Conditions ◽  
Economics Department ◽  
Irrigation Technologies

Drought conditions make landscape irrigation and reducing water use top-of-mind for many Floridians. Encouraging wise water use is of particular importance to the smart irrigation industry and water policy makers. This 5-page fact sheet written by Hayk Khachatryan, Alicia Rihn, Dong Hee Suh, and Michael Dukes and published by the UF/IFAS Food and Resource Economics Department pinpoints key attributes and barriers affecting consumers' irrigation purchases and their adoption of smart irrigation technologies. https://edis.ifas.ufl.edu/fe1080

COMPUTER SIMULATION OF A SINGLE-PHASE ASYNCHRONOUS MOTOR

2020 ◽  
pp. 29-35
Author(s):  
S.Yu. Trudnev ◽  
Keyword(s):  
Computer Simulation ◽  
Single Phase ◽  
Asynchronous Motor ◽  
Computer Models ◽  
Virtual Model ◽  
Modes Of Operation ◽  
The Real ◽  
Matlab Program ◽  
Virtual Models ◽  
Asynchronous Motors

The most widely used single-phase asynchronous motors are described and also substitution and vector dia-grams are reviewed. Theoretical and mathematical descriptions of processes of controlling and enabling asynchronous modes of operation were provided, on the basis of which computer models of a single-phase asynchronous motor in static and dynamic modes was created in the Matlab program. Experiments were per-formed on the real and virtual models, and the data obtained were processed and compared to confirm the adequacy of the developed virtual model.

Generalized Hydraulic Calculation Method Using Rational Polynomial Model

2005 ◽  
Vol 127 (1) ◽  
pp. 15-25 ◽  
Author(s):  
Ali A. Pilehvari ◽  
Robert W. Serth
Keyword(s):  
Experimental Data ◽  
Large Scale ◽  
Polynomial Model ◽  
Hydraulic Calculation ◽  
Drilling Fluids ◽  
Hydraulic Parameters ◽  
Calculation Technique ◽  
Rational Polynomial ◽  
Laminar And Turbulent Flow ◽  
Large Scale Flow

A generalized hydraulic calculation technique is presented that requires, as input, only the raw rheological data for the fluid and the values of the relevant hydraulic parameters. The method utilizes a powerful new rheological model called the Rational Polynomial model, which is capable of accurately representing the rheogram of virtually any time-independent fluid. Predictions of the new method are compared with published experimental data gathered from large-scale flow loops. The tested cases include laminar and turbulent flow for a variety of drilling fluids in both pipes and concentric annuli.

Automatic Control of Aircraft Engine in Conditions of Stand Test

2020 ◽  
Vol 21 (2) ◽  
pp. 86-92
Author(s):  
G. P. Shibanov
Keyword(s):  
Automatic Control ◽  
Aircraft Engine ◽  
Fixed Time ◽  
Transient Processes ◽  
Dynamic Mode ◽  
Time Interval ◽  
Time Of Arrival ◽  
Stand Test ◽  
Operating Modes ◽  
Tolerance Control

The general principles of automatic control of aircraft engines and functionally related systems in the conditions of their stand tests are suggested. These principles are prospectively reduced to six sequentially implemented procedures or steps. In accordance with these principles, the control of aircraft engine parameters is carried out by a computer-aided test equipment (CTE) based on a computer complex that implements algorithms based on Boolean algebra and the algebra of events and states. These algorithms allow control procedures to be carried out in dynamic mode in accordance with the schedule of testing an aircraft engine. With this control, the specified sequence of operating modes of the aircraft engine undergoing testing is observed without fixing them in time and with the possibility of skipping or repeating individual modes. Parameters are monitored at each of the next aircraft engine operating modes only after all parameters are checked in the previous mode and the value of the main determining parameter reaches the value determined for this mode. During the period of transient processes, parameters are controlled only at the points of extremum of the values of the main determining parameter with fixing the time of transient processes and determining that. "In the tolerance" or "not in the tolerance" is the checked parameter and the fixed time interval. Upon arrival of the signals from the monitoring object, the time of occurrence of which is unknown, and only the time interval during which they can appear is known, any of the CTE operation modes are terminated, tolerance control of the parameters provided by the program is performed, and the previously interrupted mode is restored. Simultaneously with the tolerance control of the parameters, the time of arrival of the above signals is recorded. The group of emergency parameters is monitored continuously throughout the entire period of stand test.

scholarly journals Novel Basic Block of Multilevel Inverter Using Reduced Number of On-State Switches and Cascaded Circuit Topology

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Aparna Prayag ◽  
Sanjay Bodkhe
Keyword(s):  
Computer Simulation ◽  
Output Voltage ◽  
Multilevel Inverter ◽  
Basic Block ◽  
Matlab Simulink ◽  
Dc Voltage ◽  
Operating Modes ◽  
Power Switches ◽  
In Series ◽  
Basic Blocks

In this paper a basic block of novel topology of multilevel inverter is proposed. The proposed approach significantly requires reduced number of dc voltage sources and power switches to attain maximum number of output voltage levels. By connecting basic blocks in series a cascaded multilevel topology is developed. Each block itself is also a multilevel inverter. Analysis of proposed topology is carried out in symmetric as well as asymmetric operating modes. The topology is investigated through computer simulation using MATLAB/Simulink and validated experimentally on prototype in the laboratory.

scholarly journals Assessment of straight and meandering furrow irrigation strategies under different inflow rates

Water SA ◽  
2019 ◽  
Vol 45 (4 October) ◽  
Author(s):  
S Sayari ◽  
M Rahimpour ◽  
M Zounemat-Kermani
Keyword(s):  
Surface Water ◽  
Water Contamination ◽  
Hydraulic Parameters ◽  
Deep Percolation ◽  
Inflow Rate ◽  
Irrigation Systems ◽  
Application Efficiency ◽  
Irrigation Time ◽  
Free Drainage ◽  
Advance Time

This paper reports the effect of straight furrow (SF) and meandering furrow (MF) irrigation strategies, as well as inflow rate, on infiltration and hydraulic parameters including advance time, recession time, and runoff hydrograph. The performance of SF and MF irrigation in terms of runoff ratio, deep percolation, and application efficiency was evaluated in 6 furrow fields at Shahid Bahonar University of Kerman, Iran. The required data were collected from the farm, consisting of free drainage furrows with length 70 m, top width 0.8 m, depth 0.25 m, and slope 0.2%. The advance and recession times were significantly longer in MF than SF irrigation. The infiltration was estimated by Lewis-Kostiakov equation. The infiltration coefficients were calculated: The values of k were higher and of a were lower in MF furrows than in SF furrows. The average runoff ratio and application efficiency for the SF irrigation events were 50.53% and 49.07%, respectively, while those of the MF irrigation events were 7.04% and 52.94%, respectively. Based on the results, the velocity of water advance in MF irrigation is decreased and, thus, the runoff, erosion losses, mass of fertilizer lost and surface water contamination were reduced. Using a lower inflow rate and appropriate irrigation time leads to better management outcomes in irrigation systems.

scholarly journals Development of the methods of calculation of the electrical installations working operation in case of quality supply disturbance

2020 ◽  
Vol 7 (3) ◽  
pp. 140-155
Author(s):  
Ismael Saeed ◽  
◽  
Azad Mohammed
Keyword(s):  
Electrical Equipment ◽  
Equation System ◽  
Fault Current ◽  
Modes Of Operation ◽  
Operating Modes ◽  
Longitudinal Asymmetry ◽  
Methods Of Calculation ◽  
Short Circuits ◽  
The Mathematical Model ◽  
The Given

This paper proposes a method of calculating of asymmetrical modes of operation of electrical installations where simple and adequate loads equivalent circuits are available with working electrical equipment. So the mathematical model of equation system is derived as universal way for calculating the systems operating modes when it is subjected to a disturbance due to asymmetry. With the help of the obtained model we can calculate different cases of symmetry disturbances, all types of short circuits, between phase short circuits, any type of longitudinal asymmetry, open circuits when there is a resistance for the fault current at the place of damage In the given method, specific types of asymmetry are considered as particular cases and easily calculated from the generalized formula, which is essentially reduces the calculation and allows us to consider cases of asymmetry of any complexity. Therefore this method is offered as a basic for calculation of asymmetry when the system is subjected to a disturbance.

scholarly journals VALIDATION OF SIMBAT-PWR USING STANDARD CODE OF COBRA-EN ON REACTOR TRANSIENT CONDITION

2016 ◽  
Vol 18 (1) ◽  
pp. 41
Author(s):  
Muhammad Darwis Isnaini ◽  
Muhammad Subekti
Keyword(s):  
Temperature Distribution ◽  
Dynamic Properties ◽  
Hydraulic Calculation ◽  
Transient Condition ◽  
Bulk Temperature ◽  
Hydraulic Parameters ◽  
Power Fluctuation ◽  
Operation Condition ◽  
Pressurized Water ◽  
Standard Code

The validation of Pressurized Water Reactor typed Nuclear Power Plant simulator developed by BATAN (SIMBAT-PWR) using standard code of COBRA-EN on reactor transient condition has been done. The development of SIMBAT-PWR has accomplished several neutronics and thermal-hydraulic calculation modules. Therefore, the validation of the simulator is needed, especially in transient reactor operation condition. The research purpose is for characterizing the thermal-hydraulic parameters of PWR1000 core, which be able to be applied or as a comparison in developing the SIMBAT-PWR. The validation involves the calculation of the thermal-hydraulic parameters using COBRA-EN code. Furthermore, the calculation schemes are based on COBRA-EN with fixed material properties and dynamic properties that calculated by MATPRO subroutine (COBRA-EN+MATPRO) for reactor condition of startup, power rise and power fluctuation from nominal to over power. The comparison of the temperature distribution at nominal 100% power shows that the fuel centerline temperature calculated by SIMBAT-PWR has 8.76% higher result than COBRA-EN result and 7.70% lower result than COBRA-EN+MATPRO. In general, SIMBAT-PWR calculation results on fuel temperature distribution are mostly between COBRA-EN and COBRA-EN+MATPRO results. The deviations of the fuel centerline, fuel surface, inner and outer cladding as well as coolant bulk temperature in the SIMBAT-PWR and the COBRA-EN calculation, are due to the value difference of the gap heat transfer coefficient and the cladding thermal conductivity.

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