Phenomenon of inhertia in the Production Systems reliability Analysis

The paper analyses the influence of the effect of inertia on the reliability of production systems. Systems inertia represents the phenomenon of continuing work for some time after the breakdown of one of the former phases. In our considerations, inertia is treated as the time elapsed from the onset of breakdown till the system's inability to work. A special method had to be devised to investigate the effect of inertia in order to evaluate the reliability of production systems and to attempt algorithmization to control the reliability of production system by means of inertia or reserving. The method of reliability analysis is presented only in an inform aspect. The possibilities of increasing reliability of production systems are listed. A comparison of the redundancy method and inertia method is presented. The results of this comparison and simulated investigations of influence of inertia on reliability of system are essential scope of the paper. Selected conclusions are as follows: when inertia approaches the last phase in the system, its influence on the shape of the distribution of the system's ability increases; an increase in inertia causes an increase in the availability of the system which approaches a certain border value; dependence of the average of a system's disability on inertia has a saddle-like character whereas dependence of the number of breakdowns (stoppages) in the system has the nature of an S-curve

Using Electre III to aid the choice of housing construction process within structural engineering

The Electre III model may be considered as a decision-aid technique suited to the appraisal of complex civil/structural engineering projects. This conclusion is based on an assessment that the model permits a general ordering of alternatives, even when individual pairs of options remain uncompared where there is insufficient information to distinguish between them. Also, the technique is capable of dealing with the mix of both quantitative and qualitative information obtained within an engineering project appraisal. Electre III is applied to the evaluation of 11 alternative multi-family housing systems on the basis of 7 criteria covering labour, material and energy demand. Using this case study, the benefits of Electre III over other decision models in the selection process concerned are emphasized.Structural Engineering Electre Iii Multi-CRITERIA Decision Analysis Mcda,