The research of systems with incomplete information in complex control object

2021 ◽

Vol 56 ◽

pp. 108-111

Author(s):

Dmitrii A. Kovalev ◽

Keyword(s):

Qualitative Analysis ◽

Control Object ◽

Chemical Reactor ◽

Steam Power ◽

Object A ◽

Complex Control ◽

Technological Processes ◽

Emergency Situations ◽

Recovery Boiler ◽

Power Boiler

The analysis of technological processes for a real control object-a recovery boiler is performed in order to determine faults and possible emergency situations. The recovery boiler is considered as a complex control object (in which a chemical reactor is combined with a steam power boiler), which is advisable to decompose into several interconnected subsystems. The study was carried out in accordance with the HAZOP application manual in the form of a qualitative analysis of faults and possible abnormal situations in the recovery boiler. The study was conducted in accordance with the decomposition of the recovery boiler for each constituent of the interconnected subsystems. As a result of research, for each of the subsystems of the recovery boiler, HAZOP work tables were developed that allow you to identify root frames-linked to specific causes of possible faults.

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Investigation of the Integrated Control System of a Helicopter Type Aircraft in Case of Onboard Equipment Failures

Mekhatronika Avtomatizatsiya Upravlenie ◽

10.17587/mau.20.568-575 ◽

2019 ◽

Vol 20 (9) ◽

pp. 568-575

Author(s):

A. A. Bolshakov ◽

A. A. Kulik

Keyword(s):

Control System ◽

Automatic Control ◽

Management System ◽

Integrated Management ◽

Control Object ◽

Hydraulic Power ◽

Integrated Management System ◽

Complex Control ◽

Complex Control System ◽

Onboard Equipment

The complex control system of the helicopter-type aircraft is considered, its design is described depending on the requirements for the aircraft and interaction with the interfaced onboard equipment. The main elements of the system are the subsystems of remote and automatic control of the helicopter. In the process of developing such a system, much attention is paid to ensuring a high level of reliability and maintaining the functions necessary for the safe completion of the flight. Therefore, the main requirement for an integrated management system is the probability of its failure in backup management with improved stability of the control object is not higher than 10-9. The authors of the article conducted the analysis of the integrated management system on accutanecost in conditions of failure of the elements included in its composition. In the course of the analysis the assessment of fault safety of subsystems of remote and automatic control is carried out. At the same time, for each system, the influence of obvious and not obvious failures on the change in the controllability of the aircraft and the safety of its flight was considered. Also, the analysis of the system in the conditions of failure of the on-Board equipment of the device. Special attention is paid to the study of the dynamics of the Executive mechanism of the system in the conditions of failure of the onboard hydraulic power supply system. The paper presents the results of studies of changes in the force, speed and quality factor of the electrohydraulic drive at various failures of hydraulic power lines on Board the aircraft. The obtained results can be used in the process of designing complex control systems, studies of electrohydraulic drives and development of methods for parrying the consequences of failures of the helicopter’s onboard equipment with respect to the complex control system, including the creation of algorithms for reconfiguring the system and the logic of controlling the functioning of its elements.

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POSSIBILITIES OF CYBER-PHYSICAL APPROACH TO STUDYING FREQUENCY PROPERTIES OF CLOSED SYSTEM WITH INCOMPLETE INFORMATION ABOUT CONTROL OBJECT MODEL

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES MANAGEMENT COMPUTER SCIENCE AND INFORMATICS ◽

10.24143/2072-9502-2021-4-21-34 ◽

2021 ◽

Vol 2021 (4) ◽

pp. 21-34

Author(s):

Elena Georgievna Krushel ◽

Ekaterina Sergeevna Potafeeva ◽

Tatyana Petrovna Ogar ◽

Ilya Viktorovich Stepanchenko ◽

Ivan Mikhailovich Kharitonov

Keyword(s):

Transfer Function ◽

Incomplete Information ◽

Closed System ◽

Control Object ◽

Optimization Procedure ◽

Frequency Characteristics ◽

System Stability ◽

Object Model ◽

Physical Approach ◽

Frequency Properties

The article considers a method of reducing the time spent on the experimental study of the frequency properties of an object with an unknown mathematical model by using the cyber-physical approach to the automation of the experiment. Nonparametric estimates of unknown frequency characteristics of an object are received from experimental data on the reaction of the object's output to the input harmonic signal in the form of a mixture of sinusoidal signals of different frequencies. To divide the output signal into components corresponding to each frequency, a computer technology is used that implements an optimization procedure for finding the values of both real and imaginary frequency characteristics, according to the frequencies represented in the harmonic input signal. The method is also suitable for accelerated evaluation of the frequency characteristics of an object with an unknown delay. There are considered the aspects of frequency properties estimation in the problem of closed system stability analysis, which is supposed to control an object with incomplete information about its model using a series-connected proportional-integral controller. The results of quick estimating the frequency characteristics of the object are used to identify the parameters of its transfer function. To solve the parameterization problem, there are used automation tools for calculating the transfer function according to data on the points of frequency characteristics implemented as part of the open-access computer mathematics system Scilab. There is given an example illustrating the possibilities of developing a control system using a reduced-order object model, as one of the applications of the results of parametric identification of the transfer function

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