processes remaining within permissible deviations from quality and costs-saving
values within optimum service time [7].
In other words, a system’s functional condition is a function of its usability time
FS = f(t), depending on individual elements’ condition.
Functional condition is represented by a set expressing summarized characteristic
of service features of an individual aggregate or element of a system.
Figure 1. Railway car’s technical condition alteration pattern
in the course of time
Another work [7] offers application of a “System’s functional condition” term as
a criterion of technical system complex assessment from the point of view of its useful
quality.
Result of research. It is necessary to have a clear understanding of a type of an
individual system and elements construing it to identify the system’s functional
condition at any specific time. For the purpose of this work systems and their elements
are classified using repair ability feature as a criterion.
According to classification proposed in [2], all systems may be split into two
types, reparable (1) and non-repairable (2). Non-reparable systems include systems
with none of their elements capable to be replaced or reconditioned. Reparable systems
contain, at least, one element which may be replaced or reconditioned [2].
Elements construing a system may be classified into two groups, constructive (1)
and non-constructive (2).
Constructive elements are separately manufactured elements included into system
assembly whatever their material, size and shape might be.
Non-constructive elements are defined as certain inseparable elements providing
required active links or normal functioning of all the constructive elements throughout
the system’s operation.
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