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针对轨道不平顺所致的列车随机振动问题,采用单维单变量随机场谐波合成法,引入轨道垂向、轨向及水平交叉谱的影响,以轨道不平顺谱为输入,对轨道不平顺过程进行模拟。通过对模拟样本的谱密度函数、相关函数检验验证表明,谐波合成法能有效地模拟出符合要求的随机样本,为轨道随机振动分析提供恰当的时域输入函数。以美国第6级线路轨道垂向不平顺功率谱为输入谱的数值算例,用谐波合成法模拟的轨道时域样本及其功率谱密度,与目标谱吻合较好。
Aiming at the random vibration of trains due to track irregularity, the unidimensional random field harmonic synthesis method is introduced to introduce the influence of track vertical, horizontal and vertical cross-track spectra. The track irregularities are taken as input and the track irregularities Process simulation. The spectral density function and the correlation function test of the simulated samples show that the harmonic synthesis method can effectively simulate the random samples that meet the requirements and provide the appropriate time-domain input function for random stochastic vibration analysis. Taking the numerical example of the vertical irregularity power spectrum of the 6th grade orbit of the United States as input spectrum, the orbit time domain samples and their power spectral density simulated by the harmonic synthesis method are in good agreement with the target spectrum.