Digital model review for abnormal noise is a critical task during the engineering design phase of full-vehicle abnormal noise development. NVH engineers conduct multiple rounds of comprehensive digital model inspections across all vehicle systems (chassis, body, interior, exterior, electrical systems, etc.) to fully identify design risks of abnormal noises in each system. They coordinate with product engineers to align on issues and formulate rectification plans. This practice drastically cuts massive cost losses caused by late-stage design changes and ensures on-schedule project development cycles.

Bench abnormal noise testing for subsystems and components is one of the key tuning methods in full-vehicle rattle performance development. Targeted components prone to abnormal noises (instrument panel assembly, auxiliary dashboard assembly, door assembly, seat assembly, seat belt retractor, etc.) are tested separately on dedicated benches via subjective evaluation combined with objective measurement. This enables more detailed and in-depth identification of component-level rattle issues and reduces the workload of full-vehicle abnormal noise tuning.

Full-vehicle road rattle tuning refers to the process of identifying and troubleshooting rattles from all vehicle systems on dedicated characteristic rattle evaluation roads at specified driving speeds. After all abnormal noise issues are identified, the vehicle’s Seat Rattle Index (SRI) is calculated based on the types of characteristic roads where rattles occur and rattle loudness, which is used to judge the overall anti-rattle performance of the vehicle.

Full-vehicle four-post rattle tuning with high & low temperature control refers to the process of identifying and troubleshooting abnormal noises of prototype vehicles under various working conditions within a test facility fully equipped with four-post rig, environmental chamber and semi-anechoic chamber. It covers dynamic road spectrum excitation rattle evaluation, static operation rattle evaluation and acoustic excitation rattle evaluation. The environmental chamber can simulate extreme temperature conditions, and conducting rattle evaluation under diverse thermal environments compensates for the limitations of road test evaluation in temperature simulation.

Customers hold high standards for vehicle anti-rattle performance not only on brand-new vehicles but also after high-mileage operation. Accordingly, the development of full-vehicle durability anti-rattle performance has grown increasingly important year by year. Comprehensive and systematic bench durability combined with rattle testing for complete vehicles represents the most efficient development method for durability-related abnormal noises. Full-scale rattle evaluations carried out at key mileage intervals throughout durability testing can effectively identify rattle defects emerging after aging, helping optimize the vehicle’s long-term anti-rattle performance. Besides, conducting post-durability rattle assessments on other aged test vehicles — including detecting durability-induced rattles and verifying corrective improvements — is another effective approach to enhance anti-rattle performance under high-mileage conditions.

Rattle consistency control for plant off-line vehicles mainly consists of two phases of work. First, during each pre-mass-production stage, identify rattle issues of off-line prototype vehicles (including a small number of design defects), carry out troubleshooting analysis and verification of rectification schemes, and continuously optimize full-vehicle anti-rattle performance through iterative problem detection and resolution. Second, in the mass production phase, track the rattle performance of mass-produced finished vehicles off the assembly line to guarantee stable and consistent anti-rattle quality. Any abnormal deviation shall trigger immediate interception and rectification to prevent defective vehicles from entering the market.