摘要
地铁线路钢轨上出现波磨现象会引发轮轨噪声等问题,曲线线路上更容易产生钢轨波磨。为研究某地铁曲线半径为300 m钢弹簧浮置板轨道线路上钢轨波磨的成因,对现场钢轨波磨进行调查测试,得到钢轨表面的不平顺测试结果并分析钢轨波磨特性;参考该钢弹簧浮置板轨道结构建立有限元模型,基于轨道结构振动理论分析波磨的形成机理。利用该模型分析轨道结构的振动特性与波磨通过频率的内在联系,通过模态分析,得出该轨道结构与波磨通过频率相对应的固有频率和振型,通过对该轨道结构进行简谐激励和白噪声激励,得到钢轨和轨道板在不同频率下的响应,分析轨道振动频率与钢轨波磨之间的联系,得出钢轨可能产生波磨的原因。研究结果表明:该区段车辆行驶速度大约为40 km/h,此波磨的主波长为160~200 mm,其通过频率为55~69 Hz;次波长为100 mm和40 mm,其通过频率为111 Hz和278 Hz;通过对模型施加不同的激励,在62,111,280~310 Hz处会产生共振,这些共振频率分别与钢轨波磨通过频率相对应。当车辆通过该波磨区段时,该轨道结构容易发生垂向弯曲振动,车辆簧下质量与轨道结构在62 Hz处产生的P2共振是160~200 mm波长波磨形成的重要原因,钢轨同轨道板一起作垂向弯曲振动引发了100 mm波长波磨,钢轨相对轨道板的垂向弯曲振动是40 mm波长波磨形成的原因。
The rail corrugation on subway lines will cause wheel/rail noise and other problems, and it is more likely to occur on curved lines. To study the causes of rail corrugation on a steel spring floating slab track with a curve radius of 300 m in a subway, the on-site rail corrugation was investigated and tested, and the irregularity test results of the rail surface were obtained and the rail corrugation characteristics were analyzed;The finite element model is established concerning the steel spring floating slab track structure, and the formation mechanism of corrugation is analyzed based on the vibration theory of the track structure. The formation mechanism of the rail corrugation is analyzed according to track structure vibration theory. The finite element model is utilized to analyze the relationship between the track vibration characteristics and rail corrugationrelated frequencies. Through modal analysis, the natural frequency and vibration mode of the track structure corresponding to the corrugation related frequency are obtained. Through the simple harmonic excitation and white noise excitation to the track structure, the responses of rail and track slab under different frequencies are obtained. The possible mechanism of rail corrugation is obtained. The results show that the vehicle speed in this section is about 40 km/h. The dominant wavelength of this rail corrugation is 160~200 mm and the rail corrugation-related frequency band is 55~69 Hz. The minor wavelengths are 100 mm and 40 mm and the corrugation-related frequencies are 111 Hz, and 278 Hz. Through applying different excitations to the model,resonance will occur at 62 Hz, 111 Hz, and 280 Hz, and these resonance frequencies correspond to the rail wave grinding frequency respectively. The resonance at 62 Hz, 111 Hz and 280~310 Hz corresponds to the rail corrugation-related frequency. The vertical bending vibrations of the track structure can be easily excited when the vehicle passes through this rail corrugation section. The P2 resonance between the
作者
唐伟
李霞
李伟
戴佳宇
王安斌
TANG Wei;LI Xia;LI Wei;DAI Jiayu;WANG Anbin(School of Urban Rail Transportation,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2022年第12期3636-3644,共9页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(52002343)。
关键词
钢弹簧浮置板轨道
钢轨波磨
振动
簧下质量
P2共振
steel spring floating slab track
rail corrugation
vibration
unsprung mass
P2 resonance
