Abnormal vibration monitoring method and device for vehicle body

Abstract

The invention provides an abnormal vibration monitoring method and device for a vehicle body.The method comprises the following steps of: acquiring vibration response of the vehicle body; according to the vibration response of the vehicle body, calculating to obtain modal participation factors of each order of vibration modes of previous preset orders of vibration modes; acquiring a vibration mode corresponding to the maximum modal participation factor in the modal participation factors as a main vibration mode; performing calculation according to the vibration response of the vehicle body to obtain modal parameters of the main vibration mode which comprise a modal frequency and a modal damping ratio; judging whether the vehicle body has abnormal vibration or not according to the modal frequency; and according to the modal damping ratio, carrying out quantitative grading alarm on the severity of the abnormal vibration. The device is used for executing the method. According to the abnormal vibration monitoring method and device for the vehicle body, the abnormal vibration of the vehicle body can be effectively recognized, and the recognition precision of the abnormal vibration of the vehicle body is improved.

Description

technical field [0001] The invention relates to the technical field of rail vehicles, in particular to a method and device for monitoring abnormal vibration of a car body. Background technique [0002] As the speed of high-speed trains increases, the dynamic interaction between the wheels and rails continues to intensify. When the wheel-rail matching relationship is poor or the car body, bogie, wheels and other parts are worn out, and the fit clearance exceeds the operating limit, it is easy to cause the car body to vibrate abnormally, causing passengers Uncomfortable reactions may even affect the safety of train operation. [0003] At present, the problems that affect the riding comfort of my country's EMUs are mainly car shaking and shaking. In the initial stage of EMU wheel turning repair, when running on the rail with excessively polished gauge angle, the main contact position of the wheel and rail is concentrated on the top of the rail, the actual equivalent taper is r...

AI Technical Summary

Problems solved by technology

In the prior art, it is possible to monitor the lateral stability index of the vehicle body by installing a vehicle-mounted stability monitoring device. The stability index is the result of weighted calculation of different vibration frequency components of the vehicle body. The monitoring results can reflect the shaking of the vehicle body to a certain extent, but Sensitivity to shaking cars is not enough to effectively identify

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