Klaudiusz Migawa

METHOD FOR CONTROL OF TECHNICAL OBJECTS OPERATION PROCESS WITH THE USE OF SEMI-MARKOV DECISION PROCESSES

In this article there is presented a description of a method for control of the operation process in a complex operation system of technical objects operation where semi-Markov decision processes are used for control. The study has been based on the operation process of a real bus municipal transportation system. For complex systems of technical objects operation, it is possible to achieve the set goal – appropriate accomplishment of the assigned task (tasks) with required efficiency – only when the control decisions, made by the system decision-makers, are rational. In systems where the complex operation process of technical objects is carried out, the choice of rational control decisions (from possible variants) is an issue of great importance and difficulty. In real complex operation systems of technical objects operation, the process of making control decisions should be carried out using mathematical procedures and methods, rather than according to the system decision makers’ intuition or experience. Use of appropriate mathematical methods for control of the operation process facilitates the choice of rational control decisions providing correct and efficient accomplishment of the assigned tasks. The presented method involves elaborating a mathematical operation model (semi-Markov model) and choosing the best control strategy (from possible decision variants), according to the accepted criterion (criteria) of technical objects operation system assessment.

Method for assessment and control of availability of executive subsystem of a transportation system

In this work, a method for assessment and control of availability of executive subsystem consisting of elementary subsystems of the type has been presented. The goal of the executive subsystem is to perform the assigned transport tasks over set routes, with a given frequency, according to a set schedule. A proper accomplishment of the transport task is possible only if the required number of technical objects (transport means) is prepared to perform the assigned task in a given time. Among many significant criteria used for assessment of a transport system operation there is one of special importance that is availability of the executive subsystem to perform the assigned tasks. Availability of the executive system to perform the assigned tasks depends on availability of particular technical objects (transport means) used in the system of transportation and their number. On the basis of the above statement, it can be said that control of the executive subsystem availability can be carried out both by selecting technical objects with the required availability and matching the required number of the objects which are to be used in the system in order to ensure proper accomplishment of the transport tasks. In this work there has been discussed a method for determination of the required availability of a single object as well as the required number of technical objects indispensable to perform appropriately the assigned transport task, on the basis of the transportation system availability assessment. Availability of the transportation system is determined on the basis of a mathematical model of the operation and maintenance process of technical objects, in the studied transportation system. Exemplary results have been presented on the basis of experimental data, obtained from the tests carried out in a real operation and maintenance system of transport means.

Markov Model of the Transport Devices Exploitation Process

Markov Model of the Transport Devices Exploitation Process The article presents the model of transport means operation and maintenance process, realized within a system of urban bus transport. On the basis of identification of the investigated system and the realized in it process, a mathematical model of the operation and ensuring efficiency processes was built, assuming that models of these processes are homogenous Markov processes. On this bases an analysis of the considered controlled process had been made. All the considerations are presented on the example of a chosen real system of operation and maintenance of means of transport. Markowski Model Procesu Eksploatacji Środków Transportu W artykule przedstawiono model procesu eksploatacji środków transportu realizowanego w systemie autobusowego transportu miejskiego. Na podstawie identyfikacji badanego systemu i realizowanego w nim procesu zbudowano matematyczny model procesu użytkowania oraz procesu zapewniania zdatności środków transportu, zakładając, że modelami tych procesów są jednorodne procesy Markowa. Na tej podstawie dokonano analizy rozpatrywanego procesu sterowanego. Całość rozważań przedstawiono na przykładzie wybranego rzeczywistego systemu eksploatacji środków transportu.

System wymuszonego dawkowania zawiesiny ściernej w docieraniu powierzchni płaskich

Przedstawiono wyniki badan stanu krawedzi elementow plaskich docieranych w ukladzie jednotarczowym. Analizowano strefe wejścia mikroziaren w procesie zaokrąglenia krawedzi docieranych elementow i zuzycie ścierniwa.

Method of Availability Control in the Transport System using Simulation Model of Operation and Maintenance Process

Abstract The paper presents the description of algorithm for calculation characteristics of simulation model for the operation and maintenance process of transport means. The model presented in the paper constitutes an integral element of the developed complex method of quality control in elaborate technical object performance systems. In the example presented in the paper, the evaluation criteria consist of the availability of technical object as well as unit profit generated in the states of the modeled operation and maintenance process. On the basis of the results of research carried out at an existing operation and maintenance system, entry data for the model were obtained and simulation experiments were carried out.

Applying Pareto Frontier to Determine Control Strategy of Technical Objects Operation Process

Abstract The paper deals with the multi-criteria model of technical objects operation process control in which the choice of control strategy is made with the use of nondeterministic methods. The decisive model was created with the use of decisive theories of semi-Markov processes. The choice of the optimum (quasi-optimum) solution is made with the use of simulated annealing algorithm. As a result of numeric calculations for used criteria functions (availability, risk), a set of quasi-optimum solutions in the form of Pareto frontier is obtained.

Implementation of Modular Trucks into Road Transport

Abstract In this article, an analysis of modular truck application in the road transport in Poland has been made. Terminology has been unified. Classification and law regulations applicable in different European countries and all over the world have been discussed. An analysis of existing solutions has been made and an optimal variant for road freight transport, including the condition and parameters of the road infrastructure in Poland, has been proposed. The study presents initial conceptual assumptions of this project as well as advisability of using these modular trucks, on the basis of a selected research object – the analyzed transport company. On this example, an analysis of costs and potential profits to be generated from transport services performed using the proposed modular trucks and with reference to costs borne by the investigated company with the use of currently operated transport means, has been made.

Method of Determining the Required Number of Technical Backup Area Posts

Abstract In complex operation systems, the processes of rendering technical objects roadworthy are carried out at specifically designed technical backup area posts. The article presents the method of defining the number of technical backup area posts required for appropriate functioning of assigned service and repair task. Then typical calculation results are presented in charts prepared on the basis of data obtained from tests at existing transport means operation system. The presented method makes it possible to analogically determine the minimum required number of posts for carrying out the assigned service and repair task for both a subsystem comprised of a group of units a given group of posts or an individual post in traffic maintenance and intervention subsystems.

Profit optimalization in operation systems

Abstract The aim of this study is to analyse the effect of reducing the number of secondary damage to profit from the work of a technical object. Considering the criterion function that describes the average profit from the work of a technical object in the operation system. The study analyses a model of profit optimization, in which the design criterion function is based on the properties of Poisson branch process. Criterion function that describes the average gain is considered in the work at sufficiently general factors. Profit lifting model from the work of a technical facility is numerically exemplified. For the analysed electrical subsystem, intervals of time between the initial damage have exponential distribution, and between secondary damage - gamma distribution. In the presented example, the ability of profit optimization in operation systems of technical objects is demonstrated.

Influence of Malfunctions of Selected Bus Subsystems on Bus Transportation Safety

Abstract This article introduces division of transport systems into land transport systems (road and rail) as well as land and water transport systems (inland and sea), depending on the type of environment in which these systems carry out their tasks. Such systems comprise the class of social engineering systems of the Man – Technological Object – Environment (M – TO – E) type. Such systems are influenced by forcing factors, leading to changes in their condition. Such factors may be divided into operational, external and anthropotechnical and they cause the degradation of the system on various levels, including a decrease of the degree of its safety. The article attempts to evaluate the safety of the operation of transport systems on the basis of the evaluation of the safety of the transport process carried out over a defined time interval Δt. The evaluation of the safety of the implemented transport process was prepared on the basis of a set of calculated index values determined depending on the type of transport.