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1838                               振   动   工   程   学   报                               第 38 卷

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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。
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