Stability Analysis Method for Periodic Delay Differential Equations with Multiple Distributed and Time-Varying Delays

Table 1

Tool parameters.

Number	Tool types	Pitch angles ψ	Helix angles β
1	Variable pitch	(70, 110, 70, 110)°	(30, 30, 30, 30)°
2	Variable helix 1	(90, 90, 90, 90)°	(30, 35, 30, 35)°
3	Variable helix 2	(70, 110, 70, 110)°	(30, 35, 30, 35)°
4	Variable helix 3	(70, 110, 70, 110)°	(35, 30, 35, 30)°