Browse Publications Technical Papers 2019-26-0170
2019-01-19

Designing Sound Of Vehicle As Per The Customer Choice With His/Her Driving Pattern 2019-26-0170

Vehicle NVH refinement process, is based on the objective measurements and jury ratings. Jury ratings does not indicate customer risk. Equal weightages are given for each load case, which results in high cost and weight design for vehicle NVH. Earlier, the customer voice was not considered during development process and focus used to be given only to refine all NVH attributes. Final product was good in one of the NVH attribute but does not appeal to customer to purchase the vehicle Customer evaluates a vehicle NVH performance with respect to below four driving patterns before and after purchasing the vehicle. 1. Showroom/Parking NVH-PT and HVAC 2. Showroom /Parking NVH-OSQ 3. City drive cycle 4. Highway drive cycle Customer voice indicates that the current NVH refinement process is not aligned with customer expectations. Current process is focused only on quietness of cabin. In reality customer expects balancing of sound character for all NVH sub attributes, which are:- • Overall PT NVH & SQ • Road Noise • Wind Noise • Operational SQ • Exterior noise • Legal Customers' expectations for each drive pattern is converted into customer voice index (CVI), which is based on C: Critical to customer perception; O: Occurrence of each drive load case throughout the vehicle drive pattern and D: Duration of each vehicle drive pattern. Based on customer voice index, critical customer drive load cases are identified and sound characters are designed for identified load cases. This process helps to create a brand image of NVH performance. Customer voice of TML new SUV is as follows. • At highway speeds, engine & road noise are well controlled, with wind noise getting loud only above 130 kmph.( Overdrive) • NVH is so good that you can speak at a regular volume with your fellow occupants (Team BHP) • The NVH level has been controlled quite well.(Economic Times)

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