The relay is responsible for the power distribution and logic control function of the EMU. The failure of the relay affects the reliability of the system. Moreover, its failure often leads to the failure of important equipment or loops on the EMU, resulting in reduced speed operation or even shutdown, affecting the order and safety of driving. Systematically carry out work with inherent problems of the manufacturer analysis based on FMEA (Failure Mode Effects Analysis) using RPN (Risk Priority Number), provide support for effective life assessment and design selection.
In order to evaluate the performance status of the speed sensor for the key components of EMU (Electric Multiple Units), according to the main environmental factors experienced by the service life-time, the type test scheme and corresponding detection requirements of the speed sensor are formulated. Combined with the test results after each type test, the performance status of the speed sensor is checked, the main faults occurring are summarized, and the failure analysis is carried out. The speed sensor is not a full-life product (less than 30 years), so it is recommended to repair it in fifth class, and the main failure location and failure stress of the product are found out, which provides important basis for the maintenance of the repair cycle and repair system.
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