In Krylov's analytical prediction model, the free field vibration response during the passage of a train is written as the superposition of the effect of all sleeper forces, using Lamb's approximate solution for the Green's function of a halfspace. When this formulation is extended with the Green's functions of a layered soil, considerable computational effort is required if these Green's funct...

Based on the analysis of load spectrum data, loading sequence and interaction between loads are considered, a fatigue life prediction model based is proposed. The preprocessed probability density function mean amplitude fitted. running condition train analyzed, one-dimensional program wheel axle constructed by extrapolating spectrum. According to modified cumulative damage method, predicted wit...

There is an increasing interest in the performance and serviceability of concrete crossties and elastic fastening systems due to the loading demands of increasing freight axle loads and the development of new high-speed passenger rail infrastructure in North America. In the light of these increasing demands, it is essential to examine and improve current design practices of prestressed concrete...

In this dissertation, a distributed robust controller, a motion control and sensing architecture, and a terrain feature localization are studied to solve general navigation problems for Compliant Framed wheeled Modular Mobile Robots (CFMMR). This type of wheeled mobile robot uses rigid axles coupled by compliant frame modules to provide both full suspension and enhanced steering capability with...

This paper deals with the kinematic analysis of a wheeled mobile robot (WMR) moving on uneven terrain. It is known in literature that a wheeled mobile robot, with a fixed length axle and wheels modeled as thin disk, will undergo slip when it negotiates an uneven terrain. To overcome slip, variable length axle (VLA) has been proposed in literature. In this paper, we model the wheels as a torus a...

When executing turning maneuvers, manual wheelchair users must overcome the rotational inertia of the wheelchair system. Differences in wheelchair rotational inertia can result in increases in torque required to maneuver, resulting in greater propulsion effort and stress on the shoulder joints. The inertias of various configurations of an ultralightweight wheelchair were measured using a rotati...

This paper aims to assess the application of Support Vector Machine (SVM) regression in order to analysis flexible pavements. To this end, 10000 Four-layer flexible pavement sections consisted of asphalt concrete layer, granular base layer, granular subbase layer, and subgrade soil were analyzed under the effect of standard axle loading using multi-layered elastic theory and pavement critical r...

One of the most common pavement distresses in flexible is rutting, which mainly caused by heavy wheel load and various other factors. The prediction rutting depth important for safe travel long-term performance pavements. Factors that are considered this paper rut Temperature, Equivalent Single Axle Load, Resilient modulus, Thickness hot mixed asphalt. input data all factors collected from Long...

The feasibility of using railroad flatcars (RRFCs) as the superstructure for bridges on lowvolume roads has been investigated in two previous research projects at Iowa State University. The results of these projects verified that RRFCs are efficient and economical alternatives for low-volume road bridges. Two county engineers involved with the RRFC project cited cost as the main factor for choo...

Over the past few decades, the use of concrete sleepers in North America has increased as a highperformance alternative to timber sleepers, especially in heavy-haul freight corridors. In order to accommodate heavier axle-loads and prevent center cracking, railroads and suppliers have consistently increased the center bending moment threshold that a sleeper must withstand, leading to stiffer ele...