Table 2.4. Change in criticality categories of failures with redundancy of elements, a. Functions; b. docking mechanism; c. mechanisms of docking frame; d. additional units and elements; e. buffer; f. shock absorbers; g. latches; h. latch drive; i. sensors; j. docking mechanism drive; k. equalization mechanisms; 1. control elements; m. locks; n. drive; o. guides; p. push rods; q. hatch; r. connectors; s. armature; t. docking; u. preservation of joint; v. undocking; w. features of redundancy; x. without back-up; y. with back-up; z. additional latches; aa. pyrotechnics; bb. independent sets; cc. pyrotechnics for undocking; dd. additional guides; ce. detached connectors; ff. valve seal; gg. ^Elements difficult to back up, or redundancy introduces additional problems in the execution of the given function or another function. Tn the analysis of the reasons of failure of electrical circuits in contact elements, in particular, circuits which control the docking device, one is usually limited to an examination of two main types of failures: open circuits and short circuits. Sometimes one can examine intermediate states, that is, the increase or decrease in resistance. The mechanical analog of these defects for elements of the
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