scholarly journals A method for detecting abnormal sequences in the diagnostic data of technological equipment of an aircraft to prevent special cases in flight

2020 ◽  
Vol 69 (2) ◽  
Author(s):  
I. O. Padalka ◽  
◽  
P. V. Open’ko ◽  
V. M. Rudenko ◽  
M. P. Stolyarenko ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Expert Knowledge ◽  
Transition Probabilities ◽  
Economic Effect ◽  
Operating Time ◽  
Process Equipment ◽  
Main Task ◽  
Technological Equipment ◽  
Diagnostic Data ◽  
Special Cases

Prediction of special cases in flight is the main task of parametric diagnostics of aircraft technological equipment. To solve this problem, on-board means of automated control, diagnostics and control of on-board equipment, unloading and information support of the crew use mathematical models based on the trend analysis of some registered operating time parameters. However, existing diagnostic models based on the corresponding mathematical models do not always allow predicting the occurrence of process equipment failures. What makes the task of forecasting special cases in flight relevant. The paper proposes a method for predicting special cases in flight based on identifying abnormal sequences in the diagnostic data of aircraft technological equipment. To identify abnormal sequences, it is proposed to use a hybrid stochastic model based on a combination of Markov and production models using temporal rules to specify transition probabilities between process states. By including more precise production rules in the model, the probability of describing random processes that are not Markovian is increased, and it becomes possible to integrate a priori expert knowledge into the model, which is very important for predicting special cases in flight. The application of the proposed method will allow to implement the prognostic principle of flight safety management, as well as to obtain the economic effect of preventing aircraft downtime due to sudden equipment failure.

scholarly journals Evaluation of the effectiveness of the forecasting system for special cases in flight based on the analysis of diagnostic data of the aircraft technological equipment

Connectivity ◽  
2020 ◽  
Vol 146 (4) ◽  
Author(s):  
I. O. Padalka ◽  
◽  
D. O. Parkhomenko ◽  
O. V. Shchenyakín ◽  
◽  
...  
Keyword(s):  
Expert Knowledge ◽  
Transition Probabilities ◽  
A Priori ◽  
Information Support ◽  
Main Task ◽  
Technological Equipment ◽  
Diagnostic Data ◽  
Production Models ◽  
Special Cases ◽  
Forecasting System

The paper proposes an approach to assessing the effectiveness of the forecasting system for special cases in flight based on the analysis of diagnostic data of the aircraft technological equipment. Prediction of special cases in flight is the main task of parametric diagnostics of aircraft technological equipment. To solve this problem, on-board automated monitoring, diagnostics and control of onboard equipment, unloading and information support of the crew make it possible to measure a large number of parameters of the aircraft technological equipment and obtain arrays of such information in digital form. It is proposed to process the received information using the method of predicting special cases in flight based on the identification of abnormal sequences in the diagnostic data of the aircraft technological equipment. To identify anomalous sequences, it is proposed to use a hybrid stochastic model based on the combination of Markov and production models that use temporal rules to refine the transition probabilities between process states. Due to the inclusion of refining production rules in the model, the probability of describing random processes that are not Markovian increases, and it also becomes possible to integrate a priori expert knowledge into the model, which is very important for predicting special cases in flight. It is proposed to evaluate the effectiveness of the forecasting system by two criteria: the efficiency and reliability of the decisions made by the aircraft crew. In the robot, a simulation was carried out on the simulator of a winding ship A-320 for evaluating the situation as well as taking decisions from the negative inheritance of particular types of problems in the country.

On the Theory of Thermally Weighted Electron-Phonon Transition Probabilities

1980 ◽  
Vol 35 (9) ◽  
pp. 902-914
Author(s):  
J. Schupfner
Keyword(s):  
Transition Probabilities ◽  
Algebraic Method ◽  
Calculation Technique ◽  
Radiative Transitions ◽  
Special Cases ◽  
Explicit Formulae ◽  
The Common ◽  
Common Transition ◽  
Franck Condon ◽  
Refined Calculation

Abstract We present a refined calculation method for the phonon part (Franck-Condon Overlaps) of the transition probabilities of electron-phonon radiative and non-radiative transitions in crystals. The evaluation of the thermal averaged Franck-Condon integrals is a purely algebraic method and the transition probabilities we use are derived from first principles and completely atomistic. For the electronic transitions we take into account the frequency shift of the lattice and the change of the phonon normal coordinates. Explicit formulae of the phonon parts are derived and it is shown that the common transition probabilities used in literature are special cases of our functional calculation technique.

Optimal repair/replacement policy for a general repair model

2001 ◽  
Vol 33 (1) ◽  
pp. 206-222 ◽  
Author(s):  
Xiaoyue Jiang ◽  
Viliam Makis ◽  
Andrew K. S. Jardine
Keyword(s):  
Average Cost ◽  
Failure Time ◽  
Operating Time ◽  
Replacement Policy ◽  
Repair Cost ◽  
Virtual Age ◽  
Preventive Replacement ◽  
Long Run ◽  
Special Cases ◽  
Cost Limit

In this paper, we study a maintenance model with general repair and two types of replacement: failure and preventive replacement. When the system fails a decision is made whether to replace or repair it. The repair degree that affects the virtual age of the system is assumed to be a random function of the repair-cost and the virtual age at failure time. The system can be preventively replaced at any time before failure. The objective is to find the repair/replacement policy minimizing the long-run expected average cost per unit time. It is shown that a generalized repair-cost-limit policy is optimal and the preventive replacement time depends on the virtual age of the system and on the length of the operating time since the last repair. Computational procedures for finding the optimal repair-cost limit and the optimal average cost are developed. This model includes many well-known models as special cases and the approach provides a unified treatment of a wide class of maintenance models.

scholarly journals SUBMISSION OF ADMINISTRATIVE DECISIONS OF USING RECREATION AND TOURIST TERRITORY AND DEVELOPMENT OF ALTERNATIVE ACTIVITY TYPES

2018 ◽  
Vol 20 (3(68)) ◽  
pp. 107-114
Author(s):  
К.O. KOSTETSKA
Keyword(s):  
Natural Resources ◽  
Economic Activity ◽  
Economic Effect ◽  
Developed Countries ◽  
The State ◽  
Environmental Damage ◽  
Main Task ◽  
Control Functions ◽  
Business Entities ◽  
Recreational Resources

Topicality. All relationships in the field of nature use begin with the legislative framework on the protection of nature and its individual components, which defines the functions of the state regulating environmental activities, as well as defined rights and responsibilities of environmental users. In most developed countries, it is a law on nature conservation or environmental acts that establishes the general principles and objectives of a policy designed to ensure the conceptual uniformity and integrity of all legislative practice in the use, protection and restoration of natural resources. System and methods of administrative management in using natural resources are based on: system of legislative acts of the country and the region; a system of normative-directive and methodological (obligatory to use) documents of state bodies; system of plans, programs, projects, tasks; operational management system. Aim and tasks. The purpose of the article is to justify institutional reforms in order to ensure the implementation of environmental legislation, the division of powers of environmental authorities at the national, regional and municipal levels on the procedure for decision-making and its implementation. Research results. The lack of coordination control functions using natural resources, namely the lack of a horizontal connection between the supervisory authorities, leads to the fact that many bodies control the same natural resource. First of all, the uncontrolled tourism activity with the use of recreational resources is observed. Thus, the main task of the state administration should be to assess the quantitative and qualitative equivalents of existing and potential natural resources and determine the strategic directions of their management, their use and protection by business entities and households. In this case, it is necessary to determine with which mechanisms to achieve the optimal use of recreational and tourist resources while minimizing environmental damage, minimizing costs and maximizing the social, economic and environmental effects of their use.Conclusions. Taking into account the economic effect that the country can have, it is expedient to take into account not only the economic potential of the recreational and tourist territory, but also the development of alternative activities on it. Control the enterprises located in this territory and conduct their economic activity with the use or extraction and subsequent resale of the recreational resource. Principal is the redistribution of taxes from economic activity to the restoration of recreational resources at the urban level. It is necessary to provide methodological explanations regarding tax provisions and benefits to enterprises involved in this process, taking into account the status of the territory in which the recreation process has arisen, taking into account the medical characteristics of the territory and the extraction of natural resources in this territory.

Tasks of inter-project unification of spacecraft on-board systems for remote sensing of the Earth

2021 ◽  
Author(s):  
V.A. Lamzin
Keyword(s):  
Remote Sensing ◽  
Economic Effect ◽  
Main Task ◽  
Space Systems ◽  
Additive Structure ◽  
The Earth ◽  
Special Case ◽  
Board System ◽  
Formulation Of Problems ◽  
Deterministic Setting

The article discusses and presents the formulation of problems of inter-project unification of on-board systems in the development of modifications of spacecraft that are part of space systems for remote sensing of the Earth. It is shown that when developing a complex of advanced space systems, it is possible to partially combine unified on-board systems and finished products, which, under given constraints, provides a minimum of total costs. The formulation of the main task of inter-project unification of spacecraft for remote sensing of the Earth using finished products and partially unified on-board systems and a special case of the problem — conducting an economically justified inter-project unification from completely unified on-board systems (aggregates) of promising modifications of spacecraft is given. The initial data and limitations for solving the main and particular problems are determined. The tasks are presented in a deterministic setting. The concept of optimality of the choice of areas of unification of each on-board system is formulated, which is characterized by the minimum of a criterion having an additive structure, this is the total economic effect for areas of unification. It is believed that the analysis of the results of solving the problems of inter-project unification in the development of promising modifications of spacecraft will reveal the directions of inter-project unification of those on-board systems for which it is most appropriate; to formulate the fundamental principles of modernization of space systems and creation of modifications of spacecraft for remote sensing of the Earth in the planned period.

scholarly journals Approach to the construction of specialized portable terminals for monitoring and controlling technological equipment

2018 ◽  
Vol 224 ◽  
pp. 01089 ◽  
Author(s):  
Petr Nikishechkin ◽  
Nadezhda Chervonnova ◽  
Anatoly Nikich
Keyword(s):  
Human Computer Interaction ◽  
Machine Tools ◽  
Process Equipment ◽  
Technological Equipment ◽  
Machining Center ◽  
Complex Process ◽  
Computer Interaction

The work deals with the features of construction of human-computer interaction to manage the complex process equipment. The mechanism for creating additional portable terminals for monitoring and controlling complex machine tools is presented. A practical example of using the mechanism for creating additional terminal solutions for monitoring and controlling the Quaser MV184P milling machining center is given.

Stability Analysis and Controller Design of Networked Control Systems with Packet Dropout

2012 ◽  
Vol 629 ◽  
pp. 835-839
Author(s):  
Ye Guo Sun
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Transition Probabilities ◽  
Sufficient Conditions ◽  
Networked Control ◽  
Linear Matrix ◽  
Packet Dropout ◽  
Markovian Jump Linear Systems ◽  
Special Cases ◽  
Stability And Stabilization

In this paper, the stability and stabilization problems of a class of networked control systems (NCSs) with bounded packet dropout are investigated. An iterative approach is proposed to model NCSs with bounded packet dropout as Markovian jump linear systems (MJLSs). The transition probabilities of MJLSs are partly unknown due to the complexity of network. The system under consideration is more general, which covers the systems with completely known and completely unknown transition probabilities as two special cases. Moreover, both sensor-to-controller and controller-to-actuator packet dropouts are considered simultaneously. The sufficient conditions for stochastic stability and stabilization of the underlying systems are derived via linear matrix inequalities (LMIs) formulation. Lastly, an illustrative example is given to demonstrate the effectiveness of the proposed results.

scholarly journals Stabilization of Discrete-Time Delayed Systems via Partially Delay-Dependent Controllers

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Guoliang Wang ◽  
Boyu Li
Keyword(s):  
Discrete Time ◽  
State Feedback ◽  
Transition Probabilities ◽  
Stabilization Problem ◽  
Delayed Systems ◽  
Stabilizing Controller ◽  
Discrete Time Markov Chain ◽  
Distribution Property ◽  
Special Cases ◽  
Delay Dependent

This paper is concerned with the stabilization problem for a class of discrete-time delayed systems, whose stabilizing controller is firstly designed to be partially delay-dependent. The distribution property of such a controller is firstly described by a discrete-time Markov chain with two modes. It is seen that two traditionally special cases of state feedback controller without or with time delay, respectively, are included. Based on the proposed controller, new stabilization conditions depending on some probabilities are developed. Because of the established results with LMI forms, they are further extended to more general cases that the transition probabilities are uncertain and totally unknown, while more applications are also given in detail. Finally, numerical examples are used to demonstrate the effectiveness and superiority of the proposed methods.

Two Markov Models of Neighborhood Housing Turnover

1972 ◽  
Vol 4 (2) ◽  
pp. 133-146 ◽  
Author(s):  
G Gilbert
Keyword(s):  
Mathematical Models ◽  
Markov Processes ◽  
Renewal Process ◽  
Markov Models ◽  
Transition Probabilities ◽  
Markov Renewal Process ◽  
Turnover Process

This paper develops two mathematical models of housing turnover in a neighborhood. The first of these draws upon the theory of non-homogeneous Markov processes and includes the effects of present neighborhood composition upon future turnover probabilities. The second model considers the turnover process as a Markov renewal process and therefore allows the inclusion of length of occupancy as a determinant of transition probabilities. Example calculations for both models are included, and procedures for using the models are outlined.

scholarly journals DYNAMIC LOAD REDUCTION DEVICE IN MACHINE DRIVE WITH SPRING AND SELECTION OF ITS PARAMETERS

2021 ◽  
Vol 297 (3) ◽  
pp. 87-93
Author(s):  
Yuri Kovalyov ◽  
◽  
Sergey Pleshko ◽  
Evgeny Lopukhov ◽  
◽  
...  
Keyword(s):  
Dynamic Loads ◽  
Practical Significance ◽  
Process Equipment ◽  
Technological Equipment ◽  
Light Industry ◽  
Torsion Spring ◽  
Operating Modes ◽  
Start Up ◽  
Dynamic Loadings ◽  
Selection Of

The peculiarity of the technological equipment of light industry is the significant dynamic loads that occur during unstable operating modes and is one of the main reasons for reducing the reliability and durability of its operation. The problem of increasing the reliability and durability of their work by reducing the dynamic loads is relevant, because the known means of reducing the dynamic loads in the drive of machines can not always be used in light industry machines. Therefore, when designing light industry equipment, first of all, attention should be paid to reducing the dynamic loads in the drive and preventing accidents. The paper considers the feasibility of using a device with a torsion spring to reduce the dynamic loads in the drive of process equipment, check its performance and develop a method for selecting rational parameters. In the course of work modern methods of researches of mechanical systems are used for the purpose of an estimation of expediency of use of the device with a torsion spring for reduction of starting dynamic loadings in the drive of machine. On the basis of the analysis of features of work of the technological equipment of light industry the expediency of use in the drive of cars of the gear safety coupling with a torsion spring is established. A new design of the device is proposed to reduce the dynamic loads that occur during machine start-up. Unlike the known devices, the proposed device is made in the form of a toothed safety clutch with a torsion spring, which simplifies its design and increases efficiency. The use of a cylindrical torsion spring as an elastic element, which connects the half-clutch to the flange on which the satellite gears are mounted, prevents overloading of the drive and the choice of rational rigidity of the device depending on the change of operation, which increases its durability and expands performance. The method of checking the efficiency of the device for reducing dynamic loads and selecting its rational parameters is presented. The scientific novelty is the development of scientific bases and engineering methods of designing devices to reduce dynamic loads in the drive of technological equipment. The practical significance lies in the development of a new design of the device to reduce the dynamic loads in the drive of machines and the engineering method of choosing its rational parameters.

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