Ensemble EMD-based automatic extraction of the catenary structure wavelength from the pantograph-catenary contact corce

Zhigang Liu, Hongrui Wang, Rolf Dollevoet, Song Yang, Alfredo Nunez Vicencio, Jingyu Zhang

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)
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This paper explores the use of pantograph-catenary contact force (PCCF) for monitoring of the current collection quality and detection of anomalies in the interaction between pantograph and catenary. The concept of catenary structure wavelength (CSW) is proposed as the dominant component of PCCF. It describes the signal components caused by the cyclical catenary structure in span and inter-dropper distance. To obtain the CSWs and non-CSW residual of PCCF, an automatic extraction approach based on the ensemble empirical mode decomposition (EEMD) is proposed. In the approach, the instantaneous frequency of each intrinsic mode function generated by EEMD is employed for the extraction of CSWs. Some selected trials on the PCCF data from simulation and measurement are performed and indicate that the extraction approach is adaptive to the PCCF under various circumstances, including different operation speed, pantograph type and catenary structure. Analyses on the extracted CSWs and non-CSW residual show that, with certain tolerance against measurement noise, the approach can preserve intact the characterizations of current collection quality and make anomalies easier to detect.
Original languageEnglish
Pages (from-to)2272-2283
Number of pages11
JournalIEEE Transactions on Instrumentation and Measurement
Issue number10
Publication statusPublished - 2016


  • Catenary structure wavelength (CSW)
  • ensemble empirical mode decomposition (EEMD)
  • extraction
  • high-speed railway (HSR)
  • intrinsic mode function (IMF)
  • pantograph-catenary contact force (PCCF)
  • Computational modeling
  • Force
  • Frequency-domain analysis
  • Rail transportation
  • Sea measurements
  • Suspensions
  • Wires


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