scholarly journals CHOICE OF LOCOMOTIVE PARK MAINTENANCE STRATEGY WHEN INTRODUCING THE SERVICE

2021 ◽  
Vol 1 (38) ◽  
pp. 14-23
Author(s):  
V. Puzyr ◽  
O. Krasheninin ◽  
Y. Datsun ◽  
O. Obozny ◽  
O. Shapatina ◽  
...  
Keyword(s):  
Optimal Strategy ◽  
Mixed Strategy ◽  
Technical Condition ◽  
Maximum Efficiency ◽  
Maintenance Strategy ◽  
Strategic Decisions ◽  
Conflict Situations ◽  
Service Application ◽  
Statistical Solutions ◽  
Theory Of Fuzzy Sets

In operation, sometimes there are situations of uncertainty in assessing the technical condition of locomotive equipment and at the same time choosing the optimal strategy for its maintenance, including the possibility of using the service. Application of the concept of service gives the chance to stimulate work of all divisions of locomotive economy, to save all kinds of resources for operation of locomotives. According to this, the article substantiates the choice of strategy for maintaining the locomotive fleet using the provisions of the theory of statistical solutions. Game theory approaches were used to theoretically substantiate the transition to a service for decision-making in conflict situations and to determine the optimal strategy of behavior of each of the participants in this situation. Approaches to the choice of strategy for the maintenance of the locomotive fleet during the introduction of the service on the basis of the provisions of the theory of strategic games on the criterion of maximum efficiency were considered. It is shown on examples of the decision of some problems of a choice of maintenance strategy of locomotives for various industrial situations. It is concluded that a mixed strategy describes different situations best and allows to made rational decisions. It is also noted that the most effective approach to concretize the algorithm of actions is the complex application of the theory of strategic decisions, the theory of fuzzy sets, the theory of pattern recognition.

scholarly journals COMPARATIVE STUDY OF DIFFERENT MAINTENANCE STRATEGIES

2020 ◽  
pp. 14-22
Author(s):  
I.V. Tolok ◽  
G.V. Banzak ◽  
E.S. Lenkov ◽  
L.M. Vozikova
Keyword(s):  
Technical Condition ◽  
Cost Structure ◽  
Maintenance Strategy ◽  
Optimal Parameters ◽  
Maintenance Strategies ◽  
Reliability Indicators ◽  
Wear And Tear ◽  
Optimal Maintenance ◽  
The Cost ◽  
Maintenance Process

A characteristic feature of complex technical objects for special purposes is the presence in their composition of a large number (tens, hundreds of thousands) of various types component parts, which have different levels of reliability, different patterns of their wear and tear processes. This feature requires a more subtle approach to the organization and planning of maintenance in course of their operation. The problem is that in the development of such facilities, all issues related to maintainability and maintenance should be addressed already at the early stages of facility design. If you do not provide in advance the necessary hardware and software for the built-in monitoring of technical condition (TC) of the object, do not develop and "build" the maintenance technology into the object, then it will not be possible to realize in the future a possible gain in the reliability of the object due to maintenance. Since all these issues must be resolved at the stage of object creation (when the object does not yet exist), mathematical models of the maintenance process are needed, with the help of which it would be possible to calculate the possible gain in the level of reliability the facility due to maintenance, to estimate the cost costs required for this. Then, on the basis of such calculations, make a decision on the need for maintenance for this type of objects and, if such a decision is made, develop the structure of the maintenance system, choose the most acceptable maintenance strategy, and determine its optimal parameters. The article shows that the optimal parameters of various maintenance strategies significantly depend on both the reliability and cost structure of the facility and specified requirements for the facility's reliability . The higher the specified value , the more serviced items should be included in the optimal maintenance strategy. It has also been proven that the effectiveness of various maintenance strategies depends significantly on the reliability and cost structure of object. If the distribution of cost restored (including serviced) elements is closely correlated with the distribution of their reliability indicators, difference in effectiveness of different maintenance strategies is reduced. This is clearly seen in the example of Test-2 object, for which the least reliable elements are also the most expensive.

scholarly journals Optimal Mixed Strategy Play: Professionals Can, Students Cannot, But What About the in Between Case?

2016 ◽  
Vol 11 (2) ◽  
pp. 104-114
Author(s):  
Jordan Pfaff ◽  
P. Joseph McGarrity
Keyword(s):  
College Athletes ◽  
Mixed Strategy ◽  
Previous Literature ◽  
Soccer Players ◽  
Middle Ground ◽  
Strategic Decisions ◽  
Professional Soccer

Abstract Using penalty kicks in collegiate soccer matches, we test whether kickers choose where to place shots, and whether goalies choose where to dive in a way that is consistent with optimal mixed strategy play. The previous literature, studying professional soccer players, provides evidence of mixed strategy play in penalty kick scenarios. These results contrast with the evidence obtained in a lab, studying subjects who only play a game a few times and have insignificant monetary payoffs. These lab results find no evidence of mixed strategy play. The contrast between the results obtained from these very different environments makes it unclear which result generalizes to other settings. By studying college athletes, we analyze the middle ground, which is where most strategic decisions will be made. We find that college players employ optimal strategic play in some respects, but not in other respects.

Evolving Solutions for Multiobjective Problems and Hierarchical AI

2008 ◽  
pp. 139-149
Author(s):  
Darryl Charles ◽  
Colin Fyfe ◽  
Daniel Livingstone ◽  
Stephen McGlinchey
Keyword(s):  
Real Time ◽  
Optimal Strategy ◽  
Strategic Decisions ◽  
Multi Objective ◽  
Multiobjective Problems ◽  
Winning Strategies ◽  
The Many

Multi-Objective Problems, MOP, are a class of problems for which different, competing, objectives are to be satisfied and for which there is generally no single best solution – but rather for which a set of solutions may exist which are all equally as good. In commercial real-time strategy, RTS, games, designers put a lot of effort into trying to create games where a variety of strategies and tactics can be employed and where (ideally) no single simple optimal strategy exists. Indeed, a great deal of effort may be spent in ‘balancing’ the game to ensure that the main strategies and units all have effective counters (Rollings and Morris, 1999). It may be the case, then, that RTS games may be considered as MOP. If not in terms of the overall goal of winning the game, which is clearly a single overriding objective, then in terms of the many different objectives that must be met in order to achieve victory. There may be a number of strong, potentially winning strategies, each of which is formed from the combination of a large number of tactical and strategic decisions – and where improvement in one area will lead to increasing a weakness elsewhere.

scholarly journals On the Necessity of Changes in the Strategy of Utilization Ship Boiler Technical Condition Maintenance in the Aspect of LNG Applied as Fuel

2017 ◽  
Vol 25 (1) ◽  
pp. 29-34
Author(s):  
Andrzej Adamkiewicz ◽  
Wojciech Zeńczak
Keyword(s):  
Alternative Fuels ◽  
Technical Condition ◽  
Liquefied Natural Gas ◽  
Sulphur Content ◽  
Exhaust Gas ◽  
Maintenance Strategy ◽  
Heavy Oils ◽  
Upper Limit ◽  
Sulphur Emissions ◽  
Main Factor

Abstract Heavy oils (HFO fuels) used on ships play a part in degradation of technical condition of heat exchange surfaces of utilization boilers especially on the exhaust gas side. Presence of sulphur in these fuels is the main factor favouring degradation. The upper limit for sulphur content in the fuel used outside the SECA areas equal to 3.5% is currently in force, at least until the year 2020 or 2025. The recommended by classification societies overhauls of utilization boilers are, therefore characterized by a specially chosen strategy thanks to which it is possible to maintain their appropriate technical condition. The requirement to use fuels with low sulphur content (LSFO), which are significantly more expensive than MDO fuels, in the areas of controlled sulphur emissions also led to a further introduction of alternative fuels, such as methanol and above all liquefied natural gas (LNG), onto ships. That is especially valid for the ship owners whose vessels e.g. ferries sail mainly within SCECA This article analyses the consequences of the introduced fuel change on utilization boiler maintenance. A change in the technical condition maintenance strategy for utilization boilers has been suggested.

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