关键词: 电驱总成；结构共振；ODS；阻尼材料；减振降噪

Abstract: This paper investigates the central electric drive assembly of a commercial vehicle model. Bench tests involving noise measurements during speed-increasing operations under loading conditions reveales pronounced resonance phenomena across multiple gear positions. To elucidate the resonance mechanism and develop mitigation strategies, a rigid-flexible coupled multi-body dynamics model of the drive assembly is established via Romax Designer. The model enables identification of resonance frequencies and corresponding structural operational deformation patterns. Subsequent local operational deflection shapes (ODS) analysis identifies the cover of shift actuator assembly as the critical resonance-prone component exhibiting maximum deformation amplitude. A noise-reduction solution involving damping material application to the inner surface of the cover is implemented without structural modifications. Comparative experimental results demonstrate significant resonance suppression, achieving a maximum noise reduction of approximately 4.6 dB(A) in the electric drive assembly.

Key words: electric drive assembly; structural resonance; ODS; damping material; vibration and noise reduction