A Class of Numerical Algorithm for Impact Degree Assessment of Emergency Systems

Table 1

Functions of impact path.

Evolution paths	Time scope	Functions
Rising stage	0,𝑇1	𝜂=𝑎𝑡^𝑏+𝑐  (𝑏>1)
Plateau stage	𝑇1,𝑇2	𝜂=𝜂0
Recession stage	𝑇2,𝑇𝑛	𝜂=𝑎𝑒^𝑏𝑡+𝑐  (𝑏<0)