Browse Publications Technical Papers 2019-26-0196
2019-01-19

Sensitivity Study of Different Damping Treatments Using Simulation and Physical Testing Methodologies on Structure Borne Driver’s Ear Noise Performance in a Vehicle 2019-26-0196

Effective damping treatment of the BIW panels of a vehicle is one of the important NVH enablers to attenuate in-cab structure borne noise and panel vibrations. Adding these damping treatments using physical testing methods at a later stage in a vehicle development program may lead to sub-optimal configuration, increase in mass and cost of these treatments. To counter this, a validated simulation based approach to determine damping treatments must be deployed much upfront in a vehicle development program. Effectiveness of a damping treatment depends on identification of most appropriate application locations on the BIW panels of a vehicle and at the same time on employing most appropriate materials having desired properties. For identifying optimized locations of damping treatments in the development of a new TATA car program, simulation based composite modal strain energy method and physical test based sound intensity technique were employed. In earlier stages of development, much before the physical prototypes of the car were available, the damping treatment locations and appropriate materials were proposed to the design community using simulation methodology. Effectiveness of these identified locations were established through simulating engine induced structure borne (WOT) noise in the vehicle cabin and noise transfer functions (NTFs) for BIW attachment points. Final damping locations were arrived at based on comprehensive study of these simulation results. Subsequently, sensitivities of different damping treatment materials were studied to arrive at the most effective material. Once the physical prototypes were built later in the program, these identified locations were validated through physical testing using sound intensity mapping method. The results correlated well with the simulation.

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