Background
Vehicle-track interaction (VTI) modeling is critical for reducing railroad derailments and improving safety. It is used to design and qualify rail vehicles, develop track geometry regulations, and find the root causes of derailments. Advanced computer software is a necessary tool for the Federal Railroad Administration (FRA) and industry to perform these tasks.
On June 30 to July 1, 2015, FRA held a best practices workshop on VTI simulation at Volpe in Cambridge, Massachusetts. The two-day workshop was attended by representatives from the government, code developers, researchers, academia, and the rail industry. The goal of the Vehicle‐Track Simulation Software Workshop was to assess and identify development needs to advance the state‐of‐the‐art of vehicle‐track simulation software packages.
Workshop Agenda and Presentations
Introduction and meeting objectives - John Tunna
Session I: Presentations on leading commercial software tools
- TTCI’s Scientific Software Suite and NUCARS Overview - Nicolas Wilson
- SIMPACK Rail - Christoph Weidemann
- VAMPIRE Pro - Peter Klauser
- VI-Rail - Gabriele Ferrarotti
Session II: Selected Modeling Challenges
- Modeling wheel/rail contact including conformal contact - Edwin Vollebregt
- Extended-Creep-Force Model in Vehicle Dynamics Simulation - Heinz-Peter Kotz
- Do We Need Better Suspension Element Models? (suspension components part 1) - Peter Klauser
- Suspension Components Part 2 and other Modeling Challenges - Nicolas Wilson
- Model Validation - Bridget Eickhoff
- Benchmarks - Phil Shackleton
- Modeling Challenges Facing FRA - Ali Tajaddini and Brian Marquis
- List of research needs (see below) – All participants
Research Needs
The following list of research needs was generated by participants during the working session of this workshop.
- Model validation
- Modeling benchmarks
- Track modeling
- Modeling conformal wheel-rail contact
- Modeling of friction suspension elements
- Modeling wheel-rail friction modifiers
- Modeling 3-dimensional wheel-rail contact geometry
- Improved coil spring model
- Modeling changes in rail profile
- Modeling rail joints
- Improved air spring model
- Design of experiments and model parametrization
- Modeling interactions between adjacent cars
- Parallel coding
- Modeling advanced suspension elements
- Modeling wheel flats and out-of-round wheels
- Parameter identification algorithms
Next Steps
A report containing further details on the workshop is currently under FRA review. In addition, FRA is soliciting proposals on several research needs identified during the workshop. Proposals for this first round of research needs are due by May 6, 2016. Information is available in FRA’s Broad Agency Announcement.