This presentation systematically explores the practical engineering and strategic methodologies of Noise, Vibration, and Harshness (NVH) development for the CATL Integrated Intelligent Chassis (CIIC). To address the challenges of customer diversity and the parallel decoupling development of the upper and lower vehicle bodies, advanced prediction methodologies are proposed, including Virtual Prototype Assembly (VPA), Blocked Force, Frequency Based Substructuring (FBS), and Virtual Point Transformation (VPT). For road noise development, the application of Cell-to-Chassis (CTC) technology structurally inverts the battery modules, significantly increasing the section modulus and dynamic stiffness of the floor. This provides an innate 2-3 dB advantage in road noise performance and enables critical weight and cost reduction in acoustic insulation materials. Furthermore, the report details the NVH development practices for the Electric Drive Unit (EDU) and thermal management systems, highlighting the calibration of Equivalent Radiation Power (ERP), the application of acoustic packaging, and the multi-stage vibration isolation of compressors. Ultimately, the study concludes that future NVH engineering will continuously navigate the trade-offs between comfort, lightweighting, and cost efficiency, heavily driven by the integration of AI, Big Data, and advanced simulation tools.
Xueying Xu (Thu,) studied this question.
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