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对路面随机谱激励的3种白噪声输入及由其计算输出的2种数值方法进行了比照,分析了其统计特征。在正态分布、均匀分布和同余法产生的零均值白噪声的输入下,计算了基于标准路面等级输入的三角级数模型,以及基于实测数据的自回归模型的路面随机谱激励。结果表明:3种白噪声的输入在时域上的频次与其子区间的长度正相关,路面随机谱激励幅值的频次特征决定于其分布类型,且由此具备不同统计特征;均匀分布宜作为三角级数法的随机相位角输入;路面不平度系数的大小决定了幅值频次和路面功率谱密度的分布区间。
Three types of white noise input of random spectrum excitation on pavement and two kinds of numerical methods of output calculation were compared, and their statistical characteristics were analyzed. Under the normal distribution, uniform distribution and zero-mean white noise generated by the congruence method, the trigonometric series model based on standard pavement level input and the random spectrum excitation based on the autoregressive model are calculated. The results show that the frequency of three kinds of white noise in the time domain is positively correlated with the length of its subinterval. The frequency characteristics of random spectrum excitation amplitude depend on its distribution type and thus have different statistical characteristics. The uniform distribution should be regarded as Trigonometric series method of random phase angle input; road roughness coefficient determines the size of the amplitude frequency and pavement power spectral density distribution interval.