轨道不平顺波长对桥上CRTS Ⅱ型板式轨道振动特性的影响

Impacts of Track Irregularity Wavelength on Vibration Characteristics of Elevated CRTS Ⅱ Slab Track

轨道不平顺的波长、幅值不同,对车辆—轨道动力响应所起的激扰作用也不同。高速客运专线行车速度高,在严格实行轨道不平顺幅值管理与均值管理基础上,必须考虑轨道不平顺波长对车-轨-桥动力性能的影响,其中轨道不平顺幅值控制较为容易,但波长控制相对更为复杂。基于此,本文利用车辆-轨道-桥梁耦合振动有限元分析模型,以德国高速低干扰轨道不平顺样本作为轨道不平顺激励模型,分析轨道不平顺波长对我国高速客运专线高架轨道结构振动的影响规律。研究结果表明:轨道不平顺对轮轨力的影响不仅体现在幅值上,轨道不平顺的波长分布特性也是影响轮轨相互作用的主要因素之一。轮轨力、钢轨振动加速度、轨道板振动加速度、桥梁振动加速度受随机不平顺的短波长成分的影响显著;减少轨道不平顺中1 m左右的短波长成分是降低轮轨力、控制轨道结构振动响应的有效手段;钢轨振动加速度级、轨道板振动加速度级、桥梁振动加速度级受轨道不平顺短波长成分影响也较大。

Different wavelengths and altitudes of track irregularities will produce different impacts on vehicle-track coupled system. For passenger-dedicated line with high-speed running,besides strict control of track irregularity altitudes the management of track irregularity wavelengths should be considered since the control of track irregularities wavelength is much more complicated. By using vehicle-track-bridge finite element model, this study probes into the impact of track irregularity wavelengths on elevated structure of high-speed line. The results showe that：1 Not only irregularity altitude but also irregularity wavelengths produce impact on wheel-rail interaction forces. 2 The impact of short wavelength track irregularities on wheel-rail interaction forces, steel rail vibration acceleration,track slab acceleration and viaduct acceleration are prominent. Reducing short wavelength track irregularities component is effective for decreasing wheel-rail interaction forces. 3 The short wavelength component of track irregularities has prominent impact on the level of steel rail vibration,track slab vibration and viaduct vibration.