Control system common cause failure analysis method based on factor beta correction

A technology of control system and failure analysis, applied in general control system, control/regulation system, instrument, etc.

CN104460337AActive Publication Date: 2015-03-25INSTR TECH & ECONOMY INST P R CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-03-25

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Abstract

The invention discloses a control system common cause failure analysis method based on factor beta correction. The method comprises the steps that a common cause failure factor beta is estimated through a traditional scoring table; if a system to be analyzed is of a 1oo2 structure, the behavior of the system obtained after diagnosis is considered, namely, whether the system enters a secure state immediately is judged, and if not, manual operation is considered, and the Z value of the factor is judged to obtain a corrected Z value; if the system is of any other structure, the difference between the structure and the 1oo2 structure is considered. Because the difference of the number of channels has great influence on some technical measures (like diversity) but has no influence on other technical measures (like environment) in avoiding the common cause failure, by reclassifying scores in the scoring table, adjustment factors are increased for the technical measures influenced by the difference of the number of channels, original values of the technical measures not influenced by the difference of the number of channels are maintained, and calculation is carried out again so as to obtain a corrected factor beta.
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Description

technical field

[0001] The invention belongs to the technical field of safety control systems, in particular to a control system common cause failure analysis method based on modified β factors. Background technique

[0002] In February 2000, the International Electrotechnical Commission (IEC) released the basic functional safety standard IEC61508, which solved the theoretical and practical problems of functional safety assurance for complex safety systems that had plagued the industry for many years, and aroused strong repercussions in the industry. After that, Europe first adopted this standard; at the end of 2003, the United States began to adopt it and enforced it in some high-risk industries; in 2006, the Chinese national standard corresponding to IEC61508 was released, the number is GB / T20438:2006, and it started on January 1, 2007 The official implementation began. Internationally, IEC61511 for the process industry, IEC62061, ISO13849, EN / IEC60204-1 for different app...

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Embodiment Construction

[0079] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0080] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0081] Such as figure 1 As shown, the common cause failure analysis method of the control system based on the modified β factor in the embodiment of the present invention includes the following steps:

[0082] S101, use the scoring table to estimate the common cause failure factor β, if the system to be analyzed is a 1oo2 structure, consider adjusting the Z value to obtain a new β, which represents the 1oo2 modified common cause failure factor ;

[0083] S102,...