Investigation into the vibro-acoustic characteristics of in-wheel electric drive system by using housing condensation surrogate model

The in-wheel electric drive system (IWEDS), which achieves significant simplification of the power chain through highly integrated design, represents a major research priority in current. However, with the pursuit of higher rotational speeds and increased power density, vibro-acoustic issues have become increasingly prominent. In this paper, a test bench is built to measure vibro-acoustic responses of the IWEDS, which revealed resonance bands near 2000 Hz and 4500 Hz. Operational deflection shape (ODS) analysis further demonstrated that torsional modes dominated at low-speed ranges, whereas breathing modes prevailed during high-speed operation. Then, a multi-dimensional housing condensation surrogate model is established and the characteristics are calculated. The comparison between numerical and testing results validates the effectiveness of the model from both modal characteristics and dynamic responses. Furthermore, this study examines the influence of different excitations on the system’s vibration response and probes into the origins of resonance bands in the novel IWEDS. The model significantly improves the accuracy and efficiency of vibration analysis and provides theoretical support for the research of the system’s vibro-acoustic performance.