Digital core technology oriented to forward development of vehicle and component NVH & rattle performance. Relying on high-precision numerical simulation with multi-physics coupling, this technology establishes a virtual driving scene equivalent to real vehicles, and immersively reproduces vehicle vibration, noise and various rattle characteristics under all working conditions. It enables accurate identification of vibro-acoustic defects and quantitative evaluation of optimization solutions prior to physical prototype manufacturing, realizing front-end control of NVH performance. The technology reduces iterations of physical vehicles and parts, shortens vehicle R&D cycles and significantly cuts real-vehicle test costs. It provides full-process support for vibro-acoustic performance development and control throughout all product phases from conceptual design to engineering implementation.