This chapter discusses Hertz contact theory, wheel/rail contact formulations, and creep force models. While most of this chapter is devoted to formulating the wheel/rail contact problem, discussions of the forces used in magnetically levitated trains are also presented. In the constraint contact formulation approach, the constraint conditions must be satisfied at the position, velocity, and acceleration levels, and the normal contact force is considered a reaction force. In the elastic contact formulation approach, the algebraic equations used to solve for the surface parameters do not impose any constraints on the motion of the wheel or wheelset, and no constraint forces are associated with these equations. In the elastic contact formulation, the normal contact force is determined using a compliant force model with assumed stiffness and damping coefficients. In both the constraint and elastic contact formulations, the dimensions of the contact ellipse are determined in order to evaluate the tangential creep forces and spin moment.
Contact Problem
2021-04-05
50 pages
Article/Chapter (Book)
Electronic Resource
English
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