Alpha-Stable Distribution and Multifractal Detrended Fluctuation Analysis-Based Fault Diagnosis Method Application for Axle Box Bearings

Table 4

The primary parameters of PSO.

Parameter	Value
Primary position and its increment vector	Generate randomly
Population size	40
Maximum iteration number	200
Accelerating coefficients c1 and c2	2
Optimal range of λ and σ	0.01–100