Abstract
SUMMARYA model of wedge dampers of Three-Piece-Freight-Truck in the presence of two-dimensional dry friction will be discussed in detail. The model presented involves the three-dimensional motion of wedge dampers to external excitations both in the lateral and vertical directions, and the static and kinetic dry friction coefficients are used. By the hyperbolic secant function the non-smooth and multi-value friction force resulting from the static and kinetic dry friction coefficients are successfully described as a nonlinear continuous function of the relative velocities. Lateral and vertical components of the dry friction force vectors on the surfaces of a wedge can be exactly determined using the new conception of friction direction angles[1] for the system in the cases of stick state and slip state. The responses of a wedge and a bolster to exciting forces on the bolster along lateral, vertical or inclined directions axe obtained. The results show that the vertical and lateral dynamic performances of the wedge dampers are coupled through friction direction angles originating from the dry friction. One interesting phenomenon is that only lateral exciting force on the bolster will cause both lateral as well as vertical vibrations of the wedge and the bolster.
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