Analysis and Diagnosis of Vibration Characteristics for Pantograph Strip Based on EMD Energy Entropy
By studying the vibration characteristics of pantograph strip under high-speed operation condition,an abnormal vibration diagnosis method based on the EMD(empirical mode decomposition)-entropy was proposed combining with the analysis of test data.Firstly,this article compared the difference between EN 50317 and Chinese criteria of the pantograph-catenary vibration.Furthermore,the test data of dynamic inspection show that the vertical vibration energy of contact strip of DSA 380 locates near 278 Hz and 550 Hz and the dominant frequency is 278 Hz.While the ANSYS modal analysis results indicate the 3rd and 5th vertical mode frequency is 279.65 Hz and 531.47 Hz which is very close to the result of the test run.It demonstrates that the Chinese standard focused on the elastic vibration of the strip and the dominant vibration frequency of the strip of DSA 380 is its 3rd mode frequency.In the end,the empirical mode decomposition algorithm is applied to adaptively decompose the signal into several intrinsic mode functions(IMF).Vibration energy converge to the 3rd mode frequency and the energy entropy exponentially decrease when anomalous vibration happens.Thus,energy entropy can be used as an indicator to judge the pantograph operation status.
NETL
NSTL
万方数据
