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采用傅立叶逆变换将轨道不平顺功率谱密度转换为时域不平顺序列,分析了美国轨道中心线各种不平顺的相关性。利用轨道中心线不平顺与左右轨道不平顺的关系,将中心线轨道不平顺等效转换为左右轨道的垂向和横向不平顺,通过车辆动力学仿真计算了轮轨作用力响应,并比较了美国五级谱单侧不平顺与中国干线谱不平顺。比较结果表明:各种中心线不平顺之间相关系数均小于0.3,为微弱相关,可视为统计独立的;中心线轨道不平顺响应与等效后的左右轨道不平顺响应的相关系数均大于0.8,为高度相关,验证了等效转换的正确性;美国五级谱单侧不平顺功率谱密度在低频部分高于中国干线谱,在高频部分则低于中国干线谱。
The Fourier transform was used to transform the spectral density of track irregularities into time-domain irregularities, and the various irregularities of the orbit centerlines in the United States were analyzed. By utilizing the relationship between the track center line irregularity and the left and right track irregularities, the irregular track of the center line is equivalently converted into the vertical and horizontal irregularities of the left and right tracks. The wheel-rail force response is calculated by vehicle dynamics simulation and compared The unilateral smoothness of the US fifth-order spectrum and the irregularity of the trunk lines in China. The comparison results show that the correlation coefficients between various centerline irregularities are all less than 0.3, which are weakly correlated and can be regarded as statistical independence. The correlation coefficients between the centerline orbit and the equivalent left and right track irregularities are all greater than 0.8, which is highly correlated, which verifies the correctness of the equivalent conversion. The unilateral unperturbed power spectral density in the US fifth-order spectrum is higher than that of China mainspeed in the low-frequency part and lower than that of the Chinese mainspeed in the high-frequency part.