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Ripple effects in yard operations

Lookup NU author(s): Dr Marin Marinov



Ripple effects are encountered when the system under study is characterised with nonstationary arrivals. The rail freight yards are typical examples for such phenomena. They are facilities that deal with non-stationary arrivals, meaning over a certain period of time there are intervals of intensive arrivals of freight trains followed by lulls. Thus, the customers, which in our case are the incoming freight trains, are served in spurts. The ripple effect tends to quickly oversaturate the yard, especially when the scheduled freight trains to arrive are very close to or even above the yard processing capacity limits. Therefore, an additional care should be paid when one deals with non-stationary arrival processes, explicitly considering the fact that such systems pass through different state phases. In this paper, we investigate a yard performance that appears to suffer a ripple effect. In order to study this phenomenon a simulation event-based model has been developed and implemented in terms of a flat-shunted rail freight yard.

Publication metadata

Author(s): Marinov M

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Transport 2008: XVIIIth Scientific Conference with International Participation

Year of Conference: 2008

Date deposited: 16/12/2009

Publisher: VTU