Browsing by Author "Kargl, Arnim"

Now showing 1 - 2 of 2

Open Access
Modeling of the Transrapid’s electromagnets and the application to large mechatronic vehicle models
(2022) Schmid, Patrick; Schneider, Georg; Kargl, Arnim; Dignath, Florian; Liang, Xin; Eberhard, Peter
This work gives an overview of a general approach for modeling the electromagnets of a magnetic levitation (Maglev) vehicle based on electromagnetic suspension. The method intends to map the magnets’ static and dynamic behavior in a frequency range relevant for use in mechatronic simulation models and Maglev control or observer design. The methodology starts with setting up the equivalent magnetic circuit considering magnetic reluctances, fringing and leakage flux, magnetic saturation, and eddy currents. Then, the resulting equations are coupled with the magnet’s electric circuits using Ampère’s law and Faraday’s law of induction. Further, a numerical model reduction technique is sketched, which yields a simplified version of the previously derived magnet model with nearly the same input-output structure and input-output behavior, suitable for large simulation models and control design. The approach’s capabilities and strengths are shown by the agreement to measurements and by implementing the resulting models in large mechatronic vehicle models of the Transrapid.
Open Access
Simulation of a high-speed maglev train on an elastic guideway of infinite length
(2022) Schneider, Georg; Schmid, Patrick; Kargl, Arnim; Liang, Xin; Dignath, Florian; Eberhard, Peter
Simulations of the coupled vehicle/guideway dynamics are an essential part in the development of high-speed magnetic levitation (maglev) systems with higher speed than traveled so far. In this contribution, a two-dimensional rigid multibody model mapping the heave-pitch motion of the vehicle is presented and used for dynamics simulations of the vehicle traveling along an infinite elastic guideway. The concept of moving system boundaries is applied for the guideway model to efficiently implement an infinite series of elastic Euler-Bernoulli beams while keeping the number of system states small. Guideway deflection interpolation and computation of equivalent nodal forces and torques are realized using Hermite polynomials. Together with a physically advanced magnet model and a model predictive control scheme, the coupled system is applied for vehicle and guideway dynamics analysis for different vehicle speeds and guideway elasticities.