scholarly journals Formation of the necessary configuration of the detection zone by radar means with superscanning on the example of the port section of Novorossiysk

2021 ◽  
pp. 162-167
Author(s):  
В.В. Ольшанский ◽  
С.А. Лутков ◽  
С.В. Мартемьянов ◽  
Е.А. Меньшенина
Keyword(s):  
Mathematical Model ◽  
Transport Infrastructure ◽  
Position System ◽  
Hydraulic Structures ◽  
Detection Zone ◽  
Security Systems ◽  
Spatial Control ◽  
Antenna Beam ◽  
Angular Sector

В статье рассматривается способ применения методов сверхбыстрого сканирования в радиолокационных технических соседствах обнаружения систем охраны объектов транспортной инфраструктуры. В основе предлагаемого подхода использована возможность формирования требуемого ракурса зондирования пространства однопозиционной системой со сверхбыстрым сканированием луча антенны в угловом секторе обзора. Опыт эксплуатации систем охраны показывает, что для обеспечения зон безопасности морских терминалов, гидротехнических сооружений, акваторий морских портов и т.п. существенным является организация пространственных зон контроля. Разработана математическая модель формирования требуемой конфигурации зоны обнаружения радиолокационным средством со сверхсканированием на примере участка порта Новороссийск. Полученные аналитические зависимости законов сверхсканирования позволяют учесть сценарии различных ситуаций нарушения безопасности, по которым тревожными считаются факты появления или движения объектов в запрещённом направлении относительно условно заданных границ контролируемой территории. The article considers a method of applying ultra-fast scanning methods in radar technical neighborhoods for detecting security systems for transport infrastructure objects. The proposed approach is based on the possibility of forming the required perspective of space sensing by a single-position system with ultra-fast scanning of the antenna beam in the angular sector of the view. The experience of operating security systems shows that the organization of spatial control zones is essential for ensuring the security zones of sea terminals, hydraulic structures, seaports, etc. A mathematical model of the formation of the required configuration of the detection zone by radar means with superscanning is developed on the example of the port of Novorossiysk section. The obtained analytical dependences of the laws of superscanning allow us to take into account scenarios of various security violation situations, according to which the facts of the appearance or movement of objects in the prohibited direction relative to the conditionally defined boundaries of the controlled territory are considered alarming.

scholarly journals POSSIBILITY OF THE MATHEMATICAL MODEL OF COUNTERACTION APPLICATION TO THE ASSESSMENT OF TRANSPORT INFRASTRUCTURE SECURITY LEVEL

2018 ◽  
Vol 21 (3) ◽  
pp. 67-77
Author(s):  
A. V. Dormidontov ◽  
L. V. Mironova ◽  
V. S. Mironov
Keyword(s):  
Mathematical Model ◽  
Classical Model ◽  
State Level ◽  
Security System ◽  
Transport Infrastructure ◽  
Security Level ◽  
Assessment Procedure ◽  
Control Parameters ◽  
Predator Prey Model ◽  
Danger Level

The air transport infrastructure objects security is the state level problem as the part of national and public security of the country. One of the directions in this field is the vulnerability assessment procedure for transport infrastructure objects and on the basis of this procedure the elaboration of ensuring their safety recommendations takes place. The mathematical substantiation of recommendations and their possible implementation is an important part of the marked problem. The possibility of mathematical model of counteraction application, which assesses the offender’s potential and the security’s potential based on evaluative dimensions of the offender and the security system, is under consideration. Assume as a basis the mathematical description model of interaction nature between defender-offender system components, the model known as the competition predator-prey model with quantitative qualitative characteristic parameters of the two systems is taken. The model is modified classical model of Lotka-Volterra competition, which allows us to estimate changes in the danger level formation with reference to the transport infrastructure object and the object security level. The analysis of possible model states is made. The control parameters of the model are described. The mathematical apparatus, which is able to evaluate the danger level, the level of transport infrastructure objects protection, to reveal parameters reducing security system potential and to perform the control parameters data is given. The presented mathematical model identifies the parameters which reduce the security system potential and controls these parameters. The management can be carried out for the purpose of system transfer from one steady state to another, preservation of its operability, increase of its operation cycle and compliance to modern safety requirements. The system of Defender-offender equations correct usage allows us to justify the configurable security system of transport infrastructure objects on the basis of the specified security level.

scholarly journals LOCAL SCOUR CHARACTERISTICS OF GROINS AT TIDAL WATERWAYS AND THEIR SIMULATION

2011 ◽  
Vol 1 (32) ◽  
pp. 66
Author(s):  
Xiping Dou ◽  
Xinzhou Zhang ◽  
Xiao-dong Zhao ◽  
Xiangming Wang
Keyword(s):  
Mathematical Model ◽  
Sediment Transport ◽  
Steady Flow ◽  
Tidal Current ◽  
River Regulation ◽  
Local Scour ◽  
Hydraulic Structures ◽  
Scour Depth ◽  
Channel Regulation ◽  
Tidal Rivers

For the channel regulation in tidal rivers, groins are often used as typical hydraulic structures. Precisely predicting the local scour depth at the groin head is the key for the project of river regulation. The local scour of groins for tidal rivers is significantly different from that for the undirectional steady flow of general rivers. In the present paper, a three-dimendional (3D) mathematical model for turbulence and sediment transport are establishmented. The local scour near the groin under the actions of tidal current and steady flow are simulated by established 3D turbulence and sediment transport numerical model.The differences of the scour development and the scour pattern near the groin under these two actions are compared.

scholarly journals Simulation of the process of free spreading of a two-dimensional water flow behind pressure-free holes

Vestnik MGSU ◽  
2021 ◽  
pp. 67-74
Author(s):  
Victor N. Kokhanenko ◽  
Mariya S. Aleksandrova ◽  
Anatolij I. Kondratenko
Keyword(s):  
Mathematical Model ◽  
Water Flow ◽  
Dynamic Properties ◽  
High Reliability ◽  
Free Flow ◽  
Hydraulic Structures ◽  
Two Dimensional ◽  
General Flow ◽  
Smooth Channel ◽  
Velocity Hodograph

Introduction. Construction of hydraulic structures must meet high reliability requirements applicable to water supply channels, free-flow pipes, and open spillways. Any analysis of hydraulic structures must take account of the dynamic properties of flows that the structures accommodate. The theory of one-dimensional free flows, used in practice, has a number of general guidelines, but lack any details. The co-authors take advantage of the theory of two-dimensional free flows, namely, the method of characteristics proposed and developed in the works of I.A. Sherenkov. Materials and methods. In her works, B.T. Emtseva suggests that a uniform flow can be coupled with a general flow only with the help of an intermediate “simple wave” flow, but this statement has no proof. We identified and analyzed a general flow in the plane of the hodograph. Thereafter, characteristics of the first family of the flow were determined. A transition to the physical plane of the flow allowed to determine the coordinates of the points of characteristics of the second family. This allowed to find the coordinates of the points of the extreme streamline and to determine its geometry. Results. The proposed mathematical model complied with the system of equations, describing the flow, and the boundary conditions when it was applied to the boundary problem of the free spreading of a stormy, potential, two-dimensional in plan, free, stationary water flow and its free inflow into a wide horizontal smooth channel. Conclusions. The concept of a general flow (previously unknown) and equations of motion in the plane of the velocity hodograph made it possible to theoretically prove its applicability to the problem of free flow spreading. A simple analytical solution is obtained in the plane of the velocity hodograph. The theoretical significance of this mathematical model consists in the possibility of its step-by-step application to practical problems and its complication from the identification of the main regularities of a simplified model of a potential flow to the practical use of simulation results. The implementation of the methodology in the form of software will make it usable by designers of hydraulic structures. This is the first stage of problem solving, and at further stages resistance will be taken into account.

scholarly journals Mathematical model for estimating the efficiency of information security systems by means of Laplace transformation and Givens method

2017 ◽  
Vol 3 (52) ◽  
pp. 234
Author(s):  
Irina Grigorevna Drovnikova ◽  
Tatiana Vyacheslavovna Meshcheryakova ◽  
Anton Dmitrievich Popov ◽  
Evgeniy Alekseevich Rogozin ◽  
Sergei Mihaylovich Sitnik
Keyword(s):  
Mathematical Model ◽  
Information Security ◽  
Laplace Transformation ◽  
Security Systems

scholarly journals The particularities of near-critical flows formation in open channels

2020 ◽  
Vol 322 ◽  
pp. 01046
Author(s):  
Oleksandr Riabenko ◽  
Oksana Kliukha ◽  
Volodymyr Tumoshchuk ◽  
Oksana Halych
Keyword(s):  
Mathematical Model ◽  
Free Surface ◽  
Cross Section ◽  
Hydraulic Structures ◽  
Critical Flow ◽  
Negative Consequences ◽  
Hydraulic Simulation ◽  
Flow Formation ◽  
Characteristic Features ◽  
Supercritical Flows

This article considers the current problems of near-critical flows. It provides short characteristics of each phenomenon and describes the cases of near-critical flow formation during the operation of the different hydraulic structures. Each of the considered phenomena has a number of characteristic features which distinguish them from the usual subcritical and supercritical flows with smooth or slowly varied movement. Such properties include the wave-like or roller nature of free-surface curves, the presence of a streamline inclination and curvature, and also a non-hydrostatic pressure distribution in depth mainly in the vertical cross-section of these phenomena. Therefore, during mathematical and numerical simulations at the designing stage of hydraulic structures it is necessary to take into account the additional parameters which characterise the particularities of near-critical flows. In cases in which these moments are neglected, there are many cases of accidents and damage being caused to structures which are operated in conditions of near-critical flow formation. An objective of this work is to provide a detailed analysis of the particularities of near-critical flows and show their negative consequences on hydraulic structures. The article presents the results of the mathematical and hydraulic simulation of wavelike near-critical flows and a comparison of the full-scale measurement and a mathematical model of translation waves.

scholarly journals Development of a mathematical model of the trolleybus steering system using a rolling rotor switched reluctance motor

2021 ◽  
pp. 63-75
Author(s):  
Tatyana Pavlenko ◽  
Оleksandr Petrenko ◽  
Viacheslav Shavkun ◽  
Ivan Aharkov
Keyword(s):  
Mathematical Model ◽  
Electric Power ◽  
Steering System ◽  
Transport Infrastructure ◽  
Technical Solution ◽  
Electric Power Steering ◽  
Efficient Operation ◽  
Power Steering ◽  
Transport Services ◽  
Rolling Rotor

An important part of the overall task of social and economic development of many developed countries is the creation of a unique transport infrastructure or improvement of transport services for the population. The cumulative solution to many problems is to improve the quality and reliability of elements and equipment in any vehicle design. This determines its efficient operation and the safety of passengers. A common urban electric transport in megacities is a trolleybus, the reliability of which depends on individual components and assemblies, power supply systems and traffic control. But this type of transport requires modern scientific and technical solutions for the design of individual components and assemblies, for example, steering, which is directly related to the safe and comfortable transportation of passengers. An innovative technical solution has been proposed that will increase the energy efficiency of the trolleybus steering system through the use of an electric power steering based on a rolling rotor electric motor. The analysis of the design is carried out and the principle of control of the rolling rotor motor is determined. Functional diagrams of the components of the trolleybus steering system with an electric power steering based on a rolling rotor motor are developed. The electromagnetic and mechanical connections of the motor with the rolling rotor are determined and mathematically described. Factors affecting the steering system when turning the steered wheels are reasoned. A mathematical model of a trolleybus steering system with an electric booster based on an electric rolling rotor motor has been developed. The mathematical model is based on the differential equations of the electrical and mechanical parts. Algebraic equations were used to characterize the electromagnetic connections of the rolling rotor motor. The proposed solution will allow simulating dynamic processes in the trolleybus steering system and evaluating the results. Determination of the efficiency of the steering system was carried out by comparative analysis of the following factors: the control action created by the driver, the condition of the road surface, dynamic and transient electromechanical processes of the system, and the like

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