Rail researchers and rollingstock engineers could be using more software data-crunching and less physical testing of locomotives if a CQUniversity Masters student achieves his goals.

Andrew George says there are now combinations of software simulation tools that can comprehensively analyse locomotive systems, traction performance and locomotive dynamics using virtual multi-body models. The approach will allow virtual testing of different locomotive types and train configurations.

Rail researcher Andrew George in front of a computer screenshot of a virtual locomotive

A key issue is the accuracy and credibility of the mathematical modelling. There are no prescribed methodologies or standards for developing and verifying such models before they are used.

Mr. George will soon head to Stuttgart in Germany to present a paper at the 2nd Joint International Conference on Multibody System Dynamics.

He will discuss a proposed locomotive model acceptance procedure which is intended for Australian freight locomotives, although it could also be modified for other countries and locomotive types.

Mr George's work could prove valuable to help rail operators avoid the need to perform expensive track tests in the real world, for what are minor vehicle or design changes.

"Virtual multi-body locomotive models can allow detailed analyses ... to be completed with less time, cost and effort," he said.

Mr George is presently conducting research as part of a larger project on locomotive adhesion funded by the national CRC for Rail Innovation project.

New locomotives with AC traction motors and advanced slip controls can exert more traction force onto the track and haul more weight for the same engine power than older locomotives with DC motors.

Although fewer AC locomotives are needed to haul a train of a given weight, this is offset by a reduction in the total engine power available in the train.

"Due to the lower power per train (which reduces costs) trains hauled by AC locos tend to travel more slowly through curves and load up force against the inside rail," Mr George says.

"The potential for track damage in some cases can be increased and so the development of virtual locomotives capability is a key part of the research."

Mr George is helping the project team calculate the extent of the wheel-rail forces imparted by the new AC motor locomotives, compared with the older DC motor locomotives.