Abstract
To understand the system function-structure under different background relations, two analysis methods are proposed based on space fault tree and factor space theory. They are the system function-structure minimal disjunctive formula and the system function-structure simplest formula. The former establishes the axiom system of system function-structure analysis based on factor logic, and proves that the system function-structure obtained by function-structure analysis method is a minimal disjunction formula. The latter gives a more detailed analysis steps based on the former idea, which is mainly used to determine the implicit relation between system function and component function. The background sets consisting of the 16 and 32 background relations are studied with these two methods. The results show that the complete background relations can obtain a certain system function-structure uniquely; the incomplete background relations can obtain a family of certain system function-structures. If the incomplete background relations are a subset of the complete background relations, then the incomplete background relations must has a linear relation between functions to complement the incomplete background relations. At the same time, the system function equivalent and replacement relation are obtained. It is also proved that the system function-structure obtained from several subsets of the background sets is the simplest and the condition required for the simplest structure of the background set is strict. At present, the above methods are mainly used for system reliability analysis in safety system engineering.
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Abbreviations
- SFSA:
-
System function-structure analysis
- R/B:
-
Background relation
- MDF:
-
Minimal disjunctive formula
- SFSSF:
-
System function-structure simplest formula
- SFS:
-
System function-structure
- FFSAT:
-
Factor function-structure analysis table
- SFT:
-
Space Fault Tree
- FS:
-
Factor Space
- f i :
-
iTh structure factor
- g :
-
Function factor
- U :
-
Universe
- F :
-
Set of factors
- X(f i):
-
Phase set(space) of fi
- X(g):
-
Phase set(space) of g
- b K :
-
Last one phase in the X(g)
- a n ( j ) j :
-
Phase of fj
- u i :
-
A sample point
- [a]:
-
A decision class for factor fj
- h :
-
Number of rows of fj in FFSAT
- m :
-
Number of rows of fj in
- d :
-
Decision d = h/m
- L f :
-
Factor logic system
- S :
-
Symbol set
- x ij :
-
Phase value, called word
- footmark ij :
-
Word xij is the ith phase of factor fj
- F(S):
-
Formula set
- ∧:
-
Conjunction
- x i (1) j (1),…,x i ( k ) j ( k ) :
-
A word set
- ∨:
-
Disjunction
- r 1 + … + r t :
-
Disjunctive normal formula
- p :
-
Tautology
- X(f i) = {x 1 j,…, x m ( i ) j}:
-
Words in jth family
- W2 :
-
Binary Boolean algebra
- (p, x) ∈ F(S) × S :
-
A proposition
- T :
-
Normal state of a system or component
- F :
-
Abnormal state of a system or component
- K :
-
Length of word set
- Z :
-
Switching system
- Z 1,…,Z 4 :
-
Four components
- x j :
-
Zj On
- x j :
-
Zj Off
- M :
-
Number um of objects
- N :
-
Number of structure factors
- x n|m :
-
Phase string
- λ :
-
Length of the phase set(string)
- Λ :
-
Phase(λ = 1) or phase set(λ > 1)
- ξ(T):
-
SFSSF of the class T
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Acknowledgements
The authors wish to thank all his friends for their valuable critics, comments and assistances on this paper. This study was partially supported by the grants (Grant nos. 51704141, 2017YFC1503102, 61350003) from the Natural Science Foundation of China. In particular, the authors would like to express the gratitude to Pro. Wang P. Z., Zhou H. J. and Wang K. Y. for their factorial logic and their related scholars for their research in the field of factor space.
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Li, S., Cui, T. Research on the system function-structure analysis based on its implicit relation. J Ambient Intell Human Comput 12, 755–767 (2021). https://doi.org/10.1007/s12652-020-02058-z
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DOI: https://doi.org/10.1007/s12652-020-02058-z