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Vertical dynamic behavior of three-piece bogie suspensions with two types of friction wedge

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Abstract

There are two common types of friction wedge in the suspension system of a three-piece bogie—the “constant damping” wedge and the variable damping wedge. A generic wagon–track dynamics interaction model has been developed to investigate the dynamic behavior of suspension systems with these two wedge types. The model differs from usual approaches in two aspects: (1) the mass of the wedge is considered in the model and, (2) the track is modeled as a flexible element with multiple degrees of freedom modeling sleepers, ballast and subgrade. The dynamic response characteristics of the two suspension-wedge systems are simulated, compared and discussed for different wedge friction conditions and track input frequencies.

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Abbreviations

B ss :

Lateral semi distance between two wedges

f :

Track input frequency

F 1,F 2 :

Friction forces on wedge surfaces

H bw :

Vertical distance between mass centres of wedge and bolster at static equilibrium

H sfw :

Vertical distance between the mass centre of the wedge and the sideframe

K ws :

Stiffness coefficient of secondary suspension set

k w :

Stiffness coefficient of the wedge spring

L ww :

Semi longitudinal distance between two wedges

m c :

Mass of wagon car body

m b :

Mass of bolster

m wg :

Mass of friction wedge

N 1,N 2 :

Normal forces on wedge surfaces

u,w :

Longitudinal and vertical relative displacements of wedge to sideframe or bolster (depending on the type of friction wedge)

v :

Wagon velocity

w 0 :

Initial compression of the wedge spring

Δw ik :

Vertical relative displacement between wedge and bolster

x :

Degree of freedom of wagon component

α :

Wedge angle

φ :

Suspension force factor

λ :

Wavelength of track geometry irregularity

μ :

Friction coefficient on wedge surfaces

ψ :

Suspension displacement factor

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Authors and Affiliations

  1. Centre for Railway Engineering, Central Queensland University, Rockhampton, 4702, Australia

    Y. Q. Sun & C. Cole

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  1. Y. Q. Sun
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  2. C. Cole
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Correspondence to Y. Q. Sun.

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Sun, Y.Q., Cole, C. Vertical dynamic behavior of three-piece bogie suspensions with two types of friction wedge. Multibody Syst Dyn 19, 365–382 (2008). https://doi.org/10.1007/s11044-007-9085-z

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  • DOI: https://doi.org/10.1007/s11044-007-9085-z

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