管道、纜繩等工程對象可靠性設計的單元化方法框架

謝里陽, 楊曉芳, 周金宇, 王學敏
(東北大學機械工程與自動化學院, 沈陽110004)

摘　要：為了建立能反映虛擬的“元件”間失效相關性的長管道或纜繩的可靠性模型，論述了管道、纜繩類連續系統的單元化(元件化) 原則，虛擬單元的尺寸與缺陷分布特征的關系，單元強度分布及單元間的失效相關性與單元尺度的關系，系統強度分布與單元強度分布的關系等。以此為基礎, 在不作“系統中各元件的失效是相互獨立的”這種傳統假設的前提下，建立了連續系統失效概率模型。 這樣的模型能反映“共因失效”這種系統中普遍存在的失效相關性，比傳統的串聯系統可靠性模型更符合實際情況，有更大的應用范圍。

關鍵詞：系統可靠性；管道；纜繩；失效概率；串聯系統；失效相關性

Framework of segment partition method for reliability
design of long pipeline and rope

XIE L i-yang, YANG Xiao-fang, ZHOU Jin-yu, WAN G Xue-min
(College of Mechanical Engineering and Automat ion, Northeastern University, Shenyang 110004, China)

Abstract：In order to establish the reliability model of long pipeline and rope, which is capable of reflect ing the correlativity between virtual components, the present paper illuminates the segment partition principle of long pipeline and rope continuity system , relat ion ship between sizes of virtual segment s and features of flaw dist ribution, distribution of segmentin tensity, the failu recorrelativity among components, relat ion ships of segment sizes, relation ships between distribution of system intensity and that of segment in tensity and so on. Based on these, under the precondition of eliminating the traditional hypothesis that failures of individual component in the same system are independent, failure probability model of continuity system is developed. Such model can reflect the "common-cause failure" -the failure correlativity generally existing in such system and it performs much better than the traditional reliability model of series system in matching the reality. Therefore, it has a wider application range.

Key words：system reliability; pipeline; rope; failure probability; series system; failure dependence