高速铁路(京沪、沪宁、沪杭线)轨道不平顺谱分析

Analysis of track irregularity spectrum for high-speed railway ( Beijing—Shanghai,Shanghai—Hangzhou and Shanghai—Hangzhou Railway)

利用改进的Welch周期图法计算了京沪、沪杭、沪宁等高速铁路的轨道不平顺功率谱密度,从波长和幅值2个角度分析其轨道不平顺特征,并对成因进行探析;利用相干理论对轨道不平顺与车体振动加速度进行分析,探讨高速线路轨道不平顺引起的车体不利波长。研究结果表明:京沪、沪杭、沪宁高速铁路普遍存在2.8～2.9,6.45～6.5,24～25和32～33m不利波长范围的周期性轨道不平顺;高速铁路高低不平顺对车体垂向加速度影响显著;各高铁线水平和扭曲不平顺对车体垂、横向振动不利波长主要为2.0～3.5m窄带周期性波长。

The track irregularity power spectrum density of Beijing - Shanghai, Shanghai - Hangzhou and Shang hai- Nanjing High -speed railway was computed with Welch Periodogram method, and the characteristics of track irregularity was investigated from the perspective of wavelength and amplitude, meanwhile comprehensive exploration was made to analyze the causes. Then the coherence theory was adopted to analyze track irregularity and train vibration acceleration, and based on this, the train＇s detrimental wavelength caused by track irregularity was studied. The results show that high -speed railway like Beijing -Shanghai, Shanghai--Hangzhou, Shang- hai--Nanjing has a detrimental wavelength ranging among 2.8--2.9, 6.45-----6.5, 24--25 and 32--33 m, re spectively. The track irregularity also has a significant effect on vertical acceleration of the carbody, and the periodic shortwave range 2--3.5 m induced by cross - level and twist irregularity has an adverse impact on vertical and lateral vibration.