Abstract The hunting phenomenon is an intrinsic swaying motion appearing in railway vehicles due to the vehicle’s forward speed and wheel–rail contact forces. Hunting consists of wheelset other components oscillations that arise above a certain known as critical or speed. These are unstable nature represent safety hazard they could lead derailment. This article analyses stability bogie nonlinea...

The Brazilian code NBR 7188 for highway bridge design prescribes a live load model consisting of 3-axle vehicle plus uniform load, which are both affected by an impact factor when considering dynamic effects. It does not play out actual traffic static effects and may be, in some cases, non-conservative. This work presents two configurations developed gathering real database, simulations, modeli...

In this study, the stress values obtained from commercial finite element analysis software ANSYS® and measured by strain gauges applied on an axle housing in test environment were compared. The is a sample heavy duty vehicles. Besides comparison, fatigue behavior of was observed under gradually increased loading conditions via hydraulic loaded benches. Load conditions, configuration change step...

In this paper, effect of uncertainty fastening system properties on the wheel/rail dynamic force (WRDF) was investigated. For purpose, two deterministic and epistemic models vehicle/track interaction were developed, using finite element method. Validity results obtained from shown through comparison between model those field tests. The effects WRDF in different axle loads, vehicle speeds, rail ...

This paper presents a design of solar tracking system driven by 12V or 24V DC motor controlled by a microchip ‘Intelligent Drive unit IBL2403’[1]. The proposed double axis rotation solar tracker ensures the optimization of conversion of solar energy to electrical energy by orientation of ‘titanium-oxide’ PV panels’ [2-6] in accordance to the hemispherical position of the Sun. The hemispheroidal...

This paper proposes a nonlinear path control for backward driving of a car-like mobile robot pushing trailer with off-axle hitching. The control law is constructed using high-gain design techniques and involves error coordinates expressed which are partially linked to the trailer and invariant properties with respect to the vehicle speed. The stability of the closed-loop system is analyzed usin...

Passenger and freight traffic on our roads continues to increase in number severity. High axle loads, high tyre pressures greater dynamic loads require load-bearing stable road pavements. Concrete pavements are highly suitable for meeting these demands over long periods of time. Therefore, they well suited the new construction renewal motorways, federal country roads, local bypasses, bus areas,...

Purpose. The study is aimed at determining experimentally the values of parameters characterizing dynamic effect rolling stock on railway track, substantiating maximum permissible (limiting) values. Methodology. To investigate interaction between track and stock, devices to record various physical processes were installed experimental sections. in 8 sections along outer line. establish actual s...