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附 录:
随机过程 Z(t)的时变均值 μ Z (t)、时变二阶矩 m Z,2 (t)、时变三阶矩 m Z,3 (t)、时变四阶矩 m Z,4 (t)、时变偏度
sw Z (t)和时变峰度 ks Z (t)的计算表达式如下:
1 n s z i(t)
μ Z(t) = ∑ (A1)
n s i = 1
1 n s 2
m Z,2(t) = ∑[ z i(t) - μ Z(t) ] (A2)
n s - 1
i = 1
1 n s 3
m Z,3(t) = ∑[ z i(t) - μ Z(t) ] (A3)
n s - 1 i = 1
1 n s 4
m Z,4(t) = ∑[ z i(t) - μ Z(t) ] (A4)
n s - 1
i = 1
m Z,3( ) t
sw Z(t) = (A5)
m Z,2( ) t
3
m Z,4( ) t
ks Z(t) = (A6)
m Z,2( ) t
2
式中,n s 为时程样本数目;z i (t)为第 i 条时程样本。

