Enklare korglutning
This project was led on behalf of Bombardier Transportation in Västerås, Sweden, incollaboration with KTH Stockholm and EPFL Lausanne. This project is connected to thedevelopment of a new and simplified tilt system for rail vehicles.Growing competition from other means of transportation has forced railway companiesthroughout the world to search for increased performances.Travelling time is the mostobvious performance indicator that may be improved by introducing high-speed trains.They require very large curve radii and long transitions curves not to impairridecomfort, another performance indicator. Building new tracks adapted to high speedtrains is very costly and can only be justified where the passenger base is large.Trains with the capability to tilt the carbodies inwards the curve is a more cost efficientalternative. The tilt inwards reduces thelateral force felt by the passengers allowing thetrain to pass curves at enhanced speed with maintained ride comfort but increases thefrequency ofmotion sickness.The benefits of tilting trains are improved speed capability in curves and enhancedpassengers comfort, but at higher buying and maintenance cost. As the conventionaltrains increase their speed in curves, the performance advantage of tilting trains isreduced while their prize is still kept significantly higher and constant. Moreover, tiltingtrains often suffer from bad reputation regarding reliability and motion sickness.This work presents astate of the art of tilting trains mainly focused on theirmechanisms, but also taking in consideration control and activation. New andsimplified solutions have been researched and are presented in comparison withexisting embodiments.Existing solutions are expected to stay advantageous and available on the market. Anew possible solution is proposed and requires further investigations to verify itsfeasabilty. No change is expected concerning activation. It is foreseen that complexcontrol algorithms using onboard track data and train position are going to be usualtechnology.