摘要
无砟轨道结构中层间离缝、结构开裂等病害与轨道内温度场的变化密切相关。为研究轨道板温度场的非线性特征,采用排列熵法计算轨道板温度场的复杂度,得出环境温度影响下轨道板温度场排列熵值变化特征和波动范围,并验证分析排列熵值表征非线性时间序列复杂度的可行性。对环境温度影响下CRTSⅡ型板式无砟轨道板表、板中、板底温度序列样本数据进行分析,结果表明:排列熵值可有效定量评价轨道板温度场的非线性状态,利用排列熵法计算可设置监测轨道板温度场状态变化的阈值上限为0.6,阈值下限为0.4,变化幅值为0.15;随着距轨道板表面距离的加大,温度序列的排列熵值不断减小,可利用排列熵值指标对轨道板温度场状态进行监测和评估,为深化和健全轨道结构运维管理工作提供技术支撑。
The defects in ballastless track structure, such as interlayer separation and structural cracking, are closely related to the change of temperature field in the track. In order to study the nonlinear characteristics of the temperature field of the track slab, the permutation entropy method is used to calculate the complexity of the temperature field of the track slab. The variation characteristics and fluctuation ranges of the permutation entropy value of the temperature field of the track slab under the influence of ambient temperature are obtained, and the feasibility of the permutation entropy value to represent the complexity of the nonlinear time series is analyzed and verified. The temperature series data of CRTSⅡ slab ballastless track under the influence of ambient temperature are analyzed. The results show that the permutation entropy can effectively evaluate the nonlinear state of the temperature field of the track slab. The upper limit of the threshold is 0.6, the lower limit of the threshold is 0.4, and the variation amplitude is 0.15. With the increase of the distance from the track slab surface, the permutation entropy of the temperature sequence is decreasing. The permutation entropy index can be employed to monitor and evaluate the temperature field of the track slab, which provides technical support for deepening and improving the operation and maintenance management of the track structure.
作者
程琴
何越磊
赵彦旭
路宏遥
CHENG Qin;HE Yuelei;ZHAO Yanxu;LU Hongyao(Shanghai University Engineering Science,Shanghai 201620,China;China Railway 21st Bureau Group Co.,Ltd.,Lanzhou 730070,China)
出处
《铁道标准设计》
北大核心
2022年第8期72-76,共5页
Railway Standard Design
基金
国家自然科学基金项目(51978393)
甘肃省科技计划资助项目(19ZD2FA001)
中国铁建股份有限公司科技研发计划项目(2019-B08)。
关键词
无砟轨道
轨道板
温度场
气象温度
排列熵
复杂度
非线性
高速铁路
ballastless track
track slab
temperature field
meteorological temperature
permutation entropy
complexity
nonlinear
high speed railway
