PSI - Issue 75

Marco Bonato et al. / Procedia Structural Integrity 75 (2025) 719–729 Author name / Structural Integrity Procedia (2025)

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Figure 4. Comparison of the Fatigue Damage Spectra (FDS) between the original customer specification (fixed sine, red line) and the internal reference standard (random PSD, blue line )

Figure 5. Comparison of the customer specification (equivalent PSD, red line) and the internal reference standard (original PSD, blue line)

4. FEA Simulations The EDC inverter's robustness to vibration is assessed using an FEA model. This FEA model is composed of the following geometric elements: the printed circuit board, the main SMD and through-hole electronic components, the main mechanical parts of the compressor such as the housing, cover and internal parts, so as to have a mass and rigidity representative of the complete product. Particular care is taken in modeling the printed circuit board, which is made of a composite material [2]. The harmonic analysis is performed by two different methods such as full and mode superposition method (MSUP). The full harmonic method is an accurate method to perform a harmonic analysis without any base modal analysis but the simulation time is very high compared to the mode superposition method. The MSUP method is highly