cutsets 1.4

Computation of minimal cutsets using MOCUS Algorithm

FT-MCS

FT-MCS is small library which computes the minimal cutsets of a given fault tree using the famous MOCUS algorithm [1, 2].

Installation

Install from PyPi

pip install cutsets

Usage

1) aircraft.csv

TOP,And,B1 B2
B1,Or,C1 C2 C3 C4
B2,Or,C5 C6 C7
C1,And,D1 D2
C2,And,D1 E2
E2,Or,D3 D4
C3,And,D5 E3
E3,Or,D2 D6
C4,And,D1 D7
C5,And,D5 E5
E5,Or,D2 D6
C6,And,D8 E6
E6,Or,D2 D4 D6
C7,And,D8 E7
E7,Or,D4 D9

import cutsets

ft = cutsets.get_ft(aircraft.csv)

cs = cutsets.mocus(ft)

print (cs)

output:

[['C2', 'B2'], ['B2', 'C3'], ['C4', 'B2'], ['D1', 'B2', 'D2']]

2) example.py

#!/usr/bin/env python3

import cutsets 

simple_ft = [("TOP", "Or", ["E1", "E2"]),
      ("E1", "Or", ["a", "b"]),
      ("E2", "And", ["c", "d"])]

cs = cutsets.mocus (simple_ft)

./example.py

Output:

[['a'], ['b'], ['d', 'c']]

References

1. N. Limnios and R. Ziani, "An Algorithm for Reducing Cut Sets in Fault-Tree Analysis," in IEEE Transactions on Reliability, vol. 35, no. 5, pp. 559-562, Dec. 1986, doi: 10.1109/TR.1986.4335545.
2. J. B. Fussell, W. E. Vesely,"A New Methodology for Obtaining Cut Sets for Fault Trees", Trans. Am. Nucl. Soc., vol 15, 1972 Jun, pp 262-263.