During the MBS Tech Days 2021, Yao YUAN from the Southwest Jiaotong University held a presentation titled "Lateral Stability Design of Railway Vehicles based on Simpack Multi-Objective Optimization".

In his presentation, Yuan speaks about how the lateral hunting stability of railway vehicles will be inadequate during the long-term service due to wheel-rail wear and variations in contact states. This can lead to phenomena such as low-frequency swaying, vibration acceleration alarm, and high-frequency shaking. In order to take into account the wide wheel-rail contact state, the suspension parameters matching of railway vehicles based on stability/comfort Pareto optimization, and the matching laws for the robust lateral stability design based on the special engineering requirements are summarized. The establishment and analysis of vehicle dynamics models are accomplished by SIMPACK code, and the optimization algorithm such as genetic algorithm NSGA-Ⅱ is adopted through MATLAB Co-simulation. The extended development of SIMPACK script languages, such as pre-processing language .sjs and post-processing language .qs is implemented for the multi-parameter and multi-objective optimization problem. Finally, several vehicle models are exemplified to illustrate the feasibility and efficiency of this method in engineering applications.

Yuan YAO received his doctorate (PhD) in Mechanical Engineering in 2010 from the Southwest Jiaotong University and began to work in the same year at the State Key Laboratory of Traction Power (TPL), a state key open research laboratory based on Southwest Jiaotong University. He received his Professor title in 2018. Yuan specializes in the dynamics simulation and analysis of railway vehicles.

Yuan has completed more than 50 projects sponsored by the Foundation and Railway Industry and has published more than 60 papers indexed by SCI or EI.

Yuan's primary research interests lay in bogie design theory, hunting stability, vibration control, and new technology of suspension systems. In addition, Yuan has done several pieces of research on coupler stability in heavy haul trains and the driving system dynamics of locomotives. 
The TPL research group has an excellent reputation within the Chinese railway industry for outstanding research and industry support in the core area of railway vehicle dynamics design and field testing. Over the past decade, they played a vital role in China in almost all types of new locomotives.

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MBS Simpack Multibody Dynamics Multibody Simulation Motion Multibody System Simulation Rail Vehicle Dynamics Simpack