A Study of Nonstationary Wind Effects on a Full-Scale Large Cooling Tower Using Empirical Mode Decomposition

Table 4

Stationarity test results for processed full-scale samples.

Position
Case  1: Replacing residue by constant mean
20 degrees	□
30 degrees	□
40 degrees	□
50 degrees	□
100 degrees	□
120 degrees	□
130 degrees	□
140 degrees	□
Case  2: Replacing residue by constant mean and subtracting IMFs 6~12
20 degrees	●
30 degrees	□
40 degrees	●
50 degrees	□
100 degrees	●
120 degrees	●
130 degrees	●
140 degrees	●

Note. ●: Stationary; □: nonstationary.