Catenary hard point determination method and device based on pantograph-catenary dynamic response
A dynamic response and catenary technology, which is applied in the direction of measuring devices, machine/structural component testing, seismology, etc., can solve problems such as insignificant amplitude changes, misjudgment, inaccurate catenary judgment results, etc., to improve accuracy The effect of reducing interference and reducing misjudgment
Active Publication Date: 2021-12-17
CHINA RAILWAYS CORPORATION +3
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The actual measurement results show that using this criterion can identify catenary faults that cause large pantograph vibration amplitudes, but cannot effectively diagnose vibrations that have relatively high frequency and relatively inconspicuous amplitude changes
In addition, since the interaction between the pantograph and catenary is high-frequency vibration, the change of pantograph-catenary contact position will cause the amplitude of vibration acceleration to have a large randomness, and the traditional amplitude-based diagnosis method is easy to cause errors. Judgment, resulting in inaccurate judgment on whether there is a hard point in the catenary
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[0020] In order to make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the application and their descriptions are used to explain the application, but not to limit the application.
[0021] The inventor found in research that: the pantograph is directly connected to the catenary, and the irregularity of the catenary will cause the vertical vibration of the pantograph. The vertical vibration acceleration of the pantograph can directly reflect the influence of the external disturbance force caused by the catenary short-wave irregularity on the dynamics of the pantograph. Pantograph-catenary relationship and wheel-rail relationship have strong duality, and the track impact index method can effectively diagnose track impact diseases. The dynamic diagnosis and ...
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The present application discloses a catenary hard point determination method and device based on pantograph-catenary dynamic response. The method includes: obtaining the vertical vibration acceleration data sequence of the pantograph, and determining the abnormality in the vertical vibration acceleration data sequence according to the acceleration threshold value, calculate the average value of the vertical vibration acceleration, and use the average value to replace the abnormal value to obtain the acceleration data series; perform EEMD and ADSSTFT on the acceleration data series to determine the time-frequency characteristics of the acceleration data series; determine the acceleration series according to the time-frequency characteristics The filtering frequency range for filtering; perform band-pass filtering on the acceleration sequence according to the filtering frequency range to obtain the filtered acceleration sequence; calculate the catenary impact index according to the filtered acceleration sequence; if the catenary impact index is greater than the given impact index threshold , it is determined that there is a hard point in the catenary. The application can improve the accuracy of judging whether there is a hard spot in the catenary, and reduce misjudgment at the same time.
Description
technical field [0001] The present application relates to the technical field of electrified railway power supply, in particular to a method and device for determining catenary hard points based on pantograph-catenary dynamic response. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] The pantograph-catenary system of electrified railway has become a research content that has attracted much attention in the entire electrified railway system due to the complexity and instability of point-to-surface contact. Electrified railways have very strict requirements on catenary equipment. The catenary is erected in the open air, has no backup and needs to withstand the impact from the pantograph, making the catenary one of the weak links of the electrified railway system. [0004] The m...
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IPC IPC(8): G01M7/08G01H17/00G01V1/00
CPCG01M7/08G01H17/00G01V1/00
Inventor 徐晓迪刘金朝张文轩李向东杨志鹏秦航远王婧丁宇鸣
Owner CHINA RAILWAYS CORPORATION