Abstract
The theoretical research on means to reduce the vertical vibrations and improve the ride comfort of the railway vehicle relies on a mechanical model obtained from the simplified representation of the vehicle, while considering the important factors and elements affecting the vibration behaviour of the carbody. One of these elements is the anti-yaw damper, mounted longitudinally, between the bogie and the vehicle carbody. The anti-yaw damper reduces the lateral vibrations and inhibits the yaw motion of the vehicle, a reason for which this element is not usually introduced in the vehicle model when studying the vertical vibrations. Nevertheless, due to the position of the clamping points of the anti-yaw damper onto the carbody and the bogie, the damping force is generated not only in the yawing direction but also in the vertical and longitudinal directions. These forces act upon the vehicle carbody, impacting its vertical vibration behaviour. The paper analyzes the effect of the anti-winding damper on the vertical vibrations of the railway vehicle carbody and the ride comfort, based on the results derived from the numerical simulations. They highlight the influence of the damping, stiffness and the damper mounting angle on the power spectral density of the carbody vertical acceleration and the ride comfort index.
Highlights
Duringtrain travel, passenger comfort can be affected by several factors, some due to the movement of the railway vehicle, such as vibrations and noise, while others coming from the environmentalconditions inside the vehicle—temperature, humidity and airspeed, lighting, or the interior fittings and decor [1,2,3]
This section examines the effect of the anti-yaw damper upon the carbody vertical vibrations and the ride comfort of the railway vehicles, by using to this purpose the results from numerical simulations
The characteristics of the vertical vibration behavior of the vehicle carbody are looked at based on the power spectral density of the vertical acceleration in the carbody reference points
Summary
Duringtrain travel, passenger comfort can be affected by several factors, some due to the movement of the railway vehicle, such as vibrations and noise, while others coming from the environmentalconditions inside the vehicle—temperature, humidity and airspeed, lighting, or the interior fittings and decor (for instance, the shape and placement of chairs) [1,2,3]. Given the role of the anti-yaw damper, to reduce the lateral vibrations and inhibit the yaw motion in the vehicle [41,42,43], this damper is not usually introduced in the vehicle model when studying the vertical vibrations.it is worth mentioning that the damping force is generated in the yawing direction and in the vertical and longitudinal directions [44], due to the unfavorable position of the clamping points of the anti-yaw damper to the carbody and the bogie. The present paper analyzes the effect of the anti-yaw damper upon the vertical vibration behavior of the railway vehicle carbody and the ride comfort at vertical vibrations To this purpose, the results derived from numerical simulations developed based on a rigid-flexible coupled type vehicle model are used, where the carbody is represented via an Euler–Bernoulli equivalent beam, while the bogies and the wheelsets are modelled through rigid bodies. Considered critical points from the ride comfort perspective [34,46]
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