Abstract
The present paper is dedicated to the analysis of under sleeper pads (USP), which are resilient elements used in ballasted track systems as vibration isolators. Four types of USP are considered. The authors present the results of laboratory tests, which are then used as input values for the finite element (FE) and mechanical model of the structure. A special focus is put on the description of an original four-degree-of-freedom (4DoF) mechanical model of the system that includes a fractional rheological model of USP. Using the proposed approaches, the dynamic characteristics of under sleeper pads are determined, and conclusions on vibration isolation effectiveness are drawn.
Highlights
Under sleeper pads (USP) are resilient elements applied, among other things, in the ballasted track systems to protect the structure as well as its surroundings against vibration caused by the rolling stock [1,2]
under sleeper pads (USP) installation can be realized in two ways: they can be put into formworks before concreting the sleepers or glued to the ready elements using a fast hardening adhesive
Papers [12,13,14,15,16,17,18] are dedicated to the mechanical modeling of railway track structures with elastic vibration isolators, such as the under sleeper pads considered in the present work
Summary
Under sleeper pads (USP) are resilient elements applied, among other things, in the ballasted track systems to protect the structure as well as its surroundings against vibration caused by the rolling stock [1,2]. Papers [12,13,14,15,16,17,18] are dedicated to the mechanical modeling of railway track structures with elastic vibration isolators, such as the under sleeper pads considered in the present work. The FE model of the considered ballasted track system with USP is presented It is a 2D model in plane strain, which provides the static and dynamic characteristics of the analyzed structures with resilient pads. While the FE model is more detailed and does not require adopting effective masses of particular structural elements, the 4DoF model is more synthetic and makes it possible to formulate simple analytic expressions that describe the properties of the analyzed systems with the use of Bode plots
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