Table 2.3. Criticality of failures of basic elements of the docking devices without redundancy, a. Functions; b. docking mechanism; c. mechanisms of docking frame; d. additional units and elements; e. docking; f. preservation of joint; g. undocking; i. hull; j. buffer; k. shock absorbers; I. latches; m. sensors; n. docking mechanism drive; o. elements of control; p. drive of latches; q. equalization mechanisms; r. locks; s. drive of locks; t. guides; u. push rods; v. hatch; w. connections; x. armature. To evaluate the efficiency of redundancy it is expedient to determine change in the categories of criticality of potential failures of redundant elements for all three basic functions, as demonstrated in Table 2.4 on the basis of an analysis of created docking devices. This approach makes it possible to determine whether the goal is reached by introducing redundancy to reveal problems which are introduced. Naturally in the development of a specific docking device more detailed analysis is required. In particular it is necessary to consider the effect of different types of failures of each element.
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