1. The State Key Laboratory of Traction Power, Southwest JiaoTong University, Chengdu, 610031;
2. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043
In order to investigate the effect of unsupported sleepers on wheel/rail dynamic interaction in heavy-haul railway, a vehicle-track coupled dynamic model for the heavy-haul freight with double suspension systems was built, taking some nonlinear factors into account. The dynamic response of wheel/rail system was calculated by numerical computation method and influence of train running speed and hang sleepers number on wheel/rail dynamic performance were compared under the conditions of complete unsupported sleepers and incomplete unsupported sleepers. Results show that the unsupported sleepers destroy the continuity of the track structure support, resulting in wheel/rail interaction rising; especially under the condition of complete hang sleepers it significantly increases with the increase of train running speed and the hang sleeper numbers. The hang sleepers will also affect the dynamic characteristics of the normal track structure before and after those. Combined action of the unsupported and track irregularity will exacerbate the wheel/rail dynamic interaction. The asymmetric sleeper support gap on both ends would also exacerbate the wheel/rail dynamic interaction under the condition of incomplete hang sleepers.
[1] Olsson, E-L. and Zackrisson, P. Long-term measurement results, Final report. Banverket, Technical report 2B/000120/T2/DA for the EUROBALT II project, Borlänge, Sweden, 2002.
[2] Xiao X, Jin X, Wen Z. Effect of Disabled Fastening Systems and Ballast on Vehicle Derailment[J]. Journal of Vibration and Acoustics, 2007, 129(2): 217-229.
[3] 肖新标,金学松,温泽峰. 轨下支承失效对直线轨道动态响应的影响[J]. 力学学报, 2008, 40(1): 67-78.
Xiao Xinbiao, Jin Xuesong, Wen Zefeng. Effect of track support failure on dynamic response of tangent track. Lixue Xuebao/Chinese Journal of Theoretical & Applied Mechanics, 2008, 40(1), 67-78.
[4] Zhu J Y, Thompson D J, Jones C J C. On the effect of unsupported sleepers on the dynamic behaviour of a railway track[J]. Vehicle System Dynamics, 2011, 49(9): 1389-1408.
[5] 朱剑月,张艳. 轨枕吊空对轨道结构动力性能的影响[J]. 中国铁道科学, 2011, 32(3): 8-15.
Zhu Jianyue, Zhang Yan. Investigation on the Dynamic Characteristics of Track Structure with Hanging Sleepers[J]. China Railway Science, 2011, 32(3): 8-15.
[6] 韩义涛,翟婉明,高建敏. 空吊轨枕对轨道结构的动力影响分析[J]. 中国科技论文在线, 2006(02): 135-140.
Han Yitao, Zhai Wanming, Gao Jianmin. Effect of voided sleepers on track structure dynamics[J]. Sciencepaper Online, 2006(02): 135-140..
[7] 蔡理平. 有砟轨道桥梁轨枕空吊对轨道动力响应影响分析[D]. 南昌:华东交通大学,2012.
Cai Liping. The influence analysis of the sleepers of ballast track bridge on track dynamic response[D]. Nanchang: East China Jiaotong University, 2012.
[8] 段玉振. 双块式轨道轨枕松动影响及维修方法研究[D]. 成都:西南交通大学,2013.
Duan Yuzhen. Research on loosen sleeper effect and maintenance method of twin-block track[D]. Chengdu: Southwest Jiaotong University, 2013.
[9] 张国栋. 双块式无砟轨道轨枕空吊动力响应分析[D]. 成都:西南交通大学,2011.
Zhang Guodong. Dynamic response analysis of unsupported sleeper in twin-block ballastless track[D]. Chengdu: Southwest Jiaotong University, 2011.
[10] 邹春华,周顺华,王炳龙. 有砟轨道路基不均匀沉降引起轨枕空吊的计算方法[J]. 铁道学报, 2013, 35(1): 87-92.
Zou Chunhua, Zhou Shunhua, Wang Binglong. Calculation method of unsupported sleepers caused by differential subgrade settlement of ballasted track[J]. Journal of the China Railway Society, 2013, 35(1): 87-92.
[11] Ishida M, Moto T, Kono A, et al. Influence of Loose Sleeper on Track Dynamics and Bending Fatigue of Rail Welds[J]. Quarterly Report of RTRI. 1999, 40(2): 80-85.
[12] Grassie S L, Cox S J. The dynamic response of railway track with unsupported sleepers[J]. ARCHIVE: Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering 1984-1988 (vols 198-202). 1985, 199(24): 123-136.
[13] Lundqvist A, Dahlberg T. Load impact on railway track due to unsupported sleepers[J]. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 2005, 219(2): 67-77.
[14] 翟婉明. 车辆-轨道耦合动力学(第三版)[M]. 北京:科学出版社,2007.
Zhai Wanming. Vehicle-track Coupling Dynamics (Third Edition)[M]. Beijing: China Science Press, 2007.