Railway vehicle flexible bogie snaking motion analysis method

Abstract

The invention discloses a method for analyzing snaking motion of a flexible bogie of a railway vehicle. The method comprises the following steps: establishing a snakelike motion analysis model with transverse movement and no head shaking of a wheel set; establishing an analysis model of the wheel pair with transverse movement and oscillating snaking movement; establishing a flexible bogie model of the primary suspension; and analyzing the snaking motion of the flexible bogie. In order to solve the problem that a flexible bogie snaking motion wavelength calculation method in the prior art cannot be directly applied to a snaking wavelength calculation process of an actual wheel pair and a framework, three first-order differential equations of longitudinal, transverse and oscillating motion of a free wheel pair are deduced; the equation serves as excitation of snaking motion and is substituted into a second-order differential equation of the flexible bogie considering primary suspension, the snaking frequency and wavelength of the framework under different wheel set transverse movement amounts are calculated in combination with snaking motion characteristics, and the calculation model is more accurate compared with an existing calculation model.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a method for analyzing the snaking 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 issue of vehicle system dynamics. With the continuous increase of the operating mileage of high-speed railways in my country, the problem of snaking instability of EMUs has become increasingly prominent. Research has found that when the equivalent taper of railway vehicle wheelsets is small, a snaking movement generally lower than 3 Hz is prone to occur. The snaking movement The frequency is close to the modal frequency of the suspension of the car body, which is likely to cause obvious shaking of the car body. When the equivalent taper of the wheel set is too large, it is prone to secondary snaking motion at 7...

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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