Vibration performance assessment and model order reduction of power electronic modules under realistic regional road excitation profiles

Power electronic modules (PEMs) in electric vehicles (EVs) are exposed to continuous mechanical vibration during operation, which may adversely affect their structural integrity and long-term reliability. This study investigates the vibration behaviour of PEMs used in EVs operating under road conditions relevant to Uzbekistan, with emphasis on modal characteristics, harmonic response, and computationally efficient structural analysis. A finite element model of the module was developed in order to identify critical vibration modes and resonance-sensitive frequency ranges. To reduce computational cost, a model order reduction (MOR) approach based on the Guyan reduction method was applied and validated against the full finite element model. The results indicate that the most critical structural response occurs in the 87-125 Hz range, where torsional and twisting modes of the heat sink and printed circuit board become pronounced. The reduced-order model preserved the dominant dynamic characteristics of the full model while significantly decreasing computational demand. The study provides a practical framework for vibration-oriented assessment and design improvement of PEM structures for EV applications under locally relevant operating conditions.