Dynamic Safety Management on the Key Equipment of Coal Gasification Based on Dbt-Dbn Method

Table 1

7 conversion scales for estimating the likelihood of events.

Linguistic term	Description	Fuzzy set
Very high (VH)	Once in a month	(0.8, 0.9, 1, 1)
High (H)	Once in every 1 to 3 months	(0.7, 0.8, 0.8, 0.9)
Relatively high (RH)	Once in every 3 to 6 months	(0.5, 0.6, 0.7, 0.8)
Medium (M)	Once in every 6 to 12 months	(0.4, 0.5, 0.5, 0.6)
Relatively low (RL)	Once in every 1 to 5 years	(0.2, 0.3, 0.4, 0.5)
Low (L)	Once in every 5 to 10 years	(0.1, 0.2, 0.2, 0.3)
Very low (VL)	Never happened	(0, 0, 0.1, 0.2)