基于动柔度法的车-线-桥垂向耦合振动分析

来源期刊:中南大学学报(自然科学版)2017年第4期

论文作者:石广田 杨建近 杨新文 张小安

文章页码:1119 - 1127

关键词:耦合振动;随机振动;动柔度;车-线-桥耦合动力学;高速铁路

Key words:coupling vibration; random vibration; dynamic flexibility; vehicle-track-bridge coupled dynamics; high speed railway

摘    要:利用动柔度的思想建立高速铁路车辆-轨道-桥梁垂向耦合动力学频域模型。将车辆看作具有10自由度的多刚体系统,推导出车辆系统的动柔度;将钢轨看作无限长Timoshenko梁、轨道板简化为自由-自由的Euler梁、桥梁简化为简支Euler梁,扣件系统和CA砂浆层用线性弹性阻尼单元模拟,从而建立线-桥垂向动力相互作用系统,利用动柔度的思想求得线-桥垂向动力相互作用系统的动柔度;利用线性化Hertz接触理论,将车辆系统与 线-桥垂向动力相互作用系统耦合成车-线-桥垂向耦合振动模型。分别求解单位简谐激励、轮轨几何粗糙度激励下的轨道系统和桥梁结构的动力学响应,最后结合虚拟激励法求解轨道谱激励下的轨道系统和桥梁结构的随机振动响应。研究结果表明:利用动柔度思想建立的频域车辆-轨道-桥梁垂向耦合动力学模型,具有逻辑清晰、求解快速的特点,能够直接求解系统在频域的动力学响应。

Abstract: A frequency domain dynamic model of vehicle-track-bridge vertical coupling system of high-speed railway was established by using the dynamic flexibility method. The vehicle subsystem was treated as the multi-rigid-body system with 10 degrees of freedom, and its dynamic flexibility was deduced by using the dynamic flexibility method. The rail, slab and bridge were respectively considered as the infinite Timoshenko beam, the freedom-freedom Euler beam and the simply supported Euler beam, and the fastener system and CA mortar layer were modeled as linear elastic and damping elements. Therefore, a vertical track-bridge dynamic interaction subsystem was developed, and its dynamic flexibility was also deduced by using the dynamic flexibility method. Using linear Hertz contact theory, the vehicle system and the vertical track-bridge dynamic interaction subsystem were coupled into a vertical vehicle-track-bridge coupling dynamic system. The dynamic responses of the track and the bridge, respectively excited by the unit harmonic force and the wheel/rail geometric irregularity, were calculated. Finally, combined with the pseudo-excitation method, the random vibration responses of the track and the bridge excited by the track spectrum were also calculated. The results show that the vehicle-track-bridge coupling dynamic model proposed in this paper has the characteristics of clear logicality and fast computation, and it can directly solve the dynamic responses of system in the frequency domain.

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