A method for analyzing meandering motion of flexible bogie of rail vehicle

Abstract

The invention discloses a meandering motion analysis method of a flexible bogie of a rail vehicle. The method includes establishing an analysis model of the serpentine motion of the wheelset with lateral movement and no yaw; establishing an analysis model of the serpentine motion of the wheelset with lateral movement and shaking; establishing a flexible bogie model with primary suspension; and analyzing the serpentine motion of the flexible bogie. In order to solve the problem that the method for calculating the meandering motion wavelength of the flexible bogie in the prior art cannot be directly applied to the calculation process of the meandering wavelength of the actual wheelset and the frame, the present invention derives three first-order motions of the free wheelset longitudinal, lateral and shaking motions. The differential equation is substituted into the second-order differential equation of the flexible bogie considering the primary suspension as the excitation of the meandering motion, and the meandering frequency and wavelength of the frame under different wheelset traverses are calculated based on the characteristics of the meandering motion. Computational models are more accurate.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a method for analyzing the meandering motion of a flexible bogie of a rail vehicle. Background technique [0002] Snaking motion is a unique phenomenon of railway vehicles, and its motion stability is directly related to the running quality of the vehicle, which is the core subject of vehicle system dynamics. With the continuous increase of the operating mileage of high-speed railways in my country, the problem of the meandering instability of the EMU has become increasingly prominent. The study found that when the equivalent taper of the railway vehicle wheelset is small, a meandering motion generally lower than 3Hz is likely to occur. The frequency is close to the modal frequency of the vehicle body suspension, which is easy to cause obvious shaking of the vehicle body. When the equivalent taper of the wheelset is too large, the secondary meandering motion of generally 7-9Hz ...

AI Technical Summary

Problems solved by technology

In 1991, Japanese scholar Shiro Koyanagi proposed a simplified calculation method for the snaking motion wavelength of flexible bogies, which was verified by measured data. It reflects the change of the wheel-set meandering frequency under different wheel-set lateral displacements, so this formula cannot be directly applied to the calculation process of the actual wheel-set and frame meandering wavelength, so it is necessary to propose a new flexible bogie meandering motion formula to study the Wheelset snaking motion law under actual wheel tread taper and different wheelset lateral displacement

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