Abstract
In this paper a numerical model to predict train induced vibration is presented. The dynamic computation considers mutual interactions in vehicle/track coupled systems by means of a finite and discrete elements method. The considered vehicle model consists of 7 two-dimensional discrete elements connected by spring/damper couples. The rail is modeled as finites beam elements connected to sleepers by pads areas. Supporting substructure consisting of pads, sleepers, ballast and foundation, is modelled as discrete elements. Components are connected each to others by spring/damper couples. Vertical profile of rail is considered as sum of trigonometric functions with phase and amplitude generated by a pseudo random process. The dynamic interaction between the wheel-sets and the rail is accomplished by using the nonlinear Hertzian theory. The strong point of this study consists in the model used to simulate the behaviour of pads. The rail-sleeper contact is assumed extended to an area defined such a contact-zone, rather than a single point assumption which fits better real case studies. Experimental validations show how prediction fits well experimental data.