Resistance of railway vehicles to roll-over in strong across winds

Leaf Roll-Up and Aquaplaning in Strong Winds and Floods

The submitted fluid dynamics video (see larger and smaller sized versions) shows roll-up and aquaplaning in tree and vine leaves in both strong winds and water flows. The specific goal of this work is to determine how leaves roll up into drag reducing shapes during storms and aquaplane above the water surface during floods. In addition to gaining insight into mechanical adaptation in the natura...

Control for Railway Vehicles

Structural Crashworthiness of Railway Vehicles

As a form of transport, rail has always maintained lower accident levels than its counterparts, the car and the airplane. The railway industry, however strives for still better safety measures to be implemented – a fact which intensifies with each accident that occurs. In the last years the continuous developments in technology, computer modeling capabilities and know-how have opened up various...

Automatic Slip Control for Railway Vehicles

In the railway industry, slip control has always been essential due to the low friction between the wheels and the rail. In this master’s thesis we have gathered several slip control methods and evaluated them. These evaluations were performed in Matlab-Simulink on a slip process model of a railway vehicle. The objective with these evaluations were to show advantages and disadvantages with the ...

Advanced Control Strategies for Tilting Railway Vehicles

This paper presents the findings of the first stage of a fundamental study of the tilt control problem. A tilting railway vehicle is described via appropriate modelling and a frequency domain analysis illustrates the problems associated with straightforward feedback control. A Kalman-Bucy filter is developed based on 3 inertial measurements (body lateral acceleration, roll and yaw rate) to prov...