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Interval and fuzzy eigenfrequency analysis of uncertain substructured FE models

De Gersem H., Moens D., Desmet W., Vandepitte D.

Computer Assisted Mechanics and Engineering Sciences

2007

Vol. 14, No. 2

167-181

This paper uses an interval and fuzzy finite element approach for the eigenfrequency analysis of a mechanical structure with uncertain parameters. The component mode synthesis method is applied for the numerical reduction of the structure, in order to reduce the calculation time of the interval and fuzzy analyses. Special attention is paid to the effect of uncertainties on the description of the substructuring technique and the consequences on the calculation time. All concepts are illustrated through a benchmark structure example.

Motional finite element simulation of magnetic brakes and solid rotor induction machines

De Gersem H., Hameyer K.

Journal of Technical Physics

2002

Vol. 43, no 4

389-397

The torques of a magnetic brake and a solid rotor induction machine, fed by sinusoidal voltage sources, are simulated by a motional finite element method. Oscillatory solutions occurring for motional models with elevated velocities, are prevented by adaptive mesh refinement relying upon intermediate solutions stabilised by upwinded finite element test functions. A relaxed successive approximation deals with the non-linear material properties. The connections of the conductors and windings within the finite element model to external loads, impedances and supplies are represented by an electric circuit and added to the system of equations. The technical examples indicate the advantages of the motional formulation.