The paper concerns results relevant to systems with conventional rail infrastructure arising from a wide-ranging research programme which considers the technological requirements for single-vehicle automated headway systems using conventional infrastructure. The modelling of two variants of an electrically powered vehicle suitable for automated operation is described and conclusions drawn. However, a typical traction drive may not achieve accurate control of vehicle separation during transient loads such as wind gusts or loss of adhesion within specified acceleration and jerk limits are applied. A device which will absorb transients, provide specified longitudinal ride comfort and reduce vibration is required. To assist the control system, it is suggested that bridging dampers may reduce inter-vehicle spacing and may be similarly employed for the 'zero- headway' operation of non-rigidly coupled vehicles in a conventional train with all vehicles powered. The characteristics of the bridging dampers need to be consistent with the different tasks that the dampers must perform under five different operation modes (convoy travelling at constant velocity, convoy changing velocity, vehicle joining the convey, convoy seperating, emergency event of severe collision). Physical contact among vehicles has adverse effects on the ride quality due to the transmission of shock and vibration, hence the need to alter the response of the dampers according to existing dynamic states. The main metric for ride quality used in this research is the Vibration Dose Value. By the use of inter-vehicle damping devices, ride quality can be improved. Similarly, dampers applied to convoy systems will allow improved vehicle throughput due to reduced headway distances without compromising safe standards of operation.
Studies into enhancement of longitudinal ride comfort through the use of quasi-active inter-vehicle damping devices
2003
8 Seiten, 6 Bilder, 18 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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