car body acceleration is an important factor affecting track safety and ride comfort, which are two primary aspects of railway systems. though track level is an important source of wagon body acceleration, no quantitative relation between them is available and the aim of this paper is to propose a method to address this issue. to do so, car body acceleration is determined using a 10 dof simulat...

Single-track railway bridges are susceptible of experiencing high levels vertical acceleration on the deck that may be dangerously accentuated at resonance. This is especially critical for short-to-medium span simply supported bridges. problem can compromise safety trains and increase maintenance costs track. The main objective this work to investigate influence ballasted track dynamic behaviou...

obtaining temperature distribution data of slabs under rolling is essential as the mechanical and metallurgical properties of the metal under this process vary with temperature. using the control volume method, a mathematical model is employed in this study to predict slab temperature in the hot roll process at mobarakeh steel company. the effects of different parameters including the heat resu...

To study the mapping relationship between girder deformation and rail for CRTS Ⅲ slab ballastless track (SBT) multi-span simply supported bridge, this derived a simplified analytical solution, corresponding ANSYS finite element model (AFEM) was established. Compared with fine (FAM) AFEM, calculation results of three models under conditions pier settlement vertical fault were compared, which ver...

Push plate test is a powerful tool to evaluate the interfacial bond performance of China railway track structure type-II slab ballastless (CRTS II SBTS). However, there still lack theoretical explanation push test. In this paper, linear proportional distribution method proposed in terms series analytical formulas describe force-displacement variation CRTS SBTS different damage stages horizontal...

We exploit recently developed topology-optimization techniques to design complex, wavelength-scale resonators for enhancing various nonlinear χ(2) and χ(3) frequency conversion processes. In particular, we demonstrate aperiodic, multi-track ring resonators and two-dimensional slab microcavities exhibiting long lifetimes Q≳104, small modal volumes V≳(λ/2n)3<...