Designing the damping treatment of a vehicle body
Car manufacturers are constantly seeking methodologies to enhance acoustic performance whilst meeting demanding weight and cost targets. Most optimisation strategies are designed via numerical simulations and later adjusted through modal and noise testing. Although traditional approaches are fairly effective, they require a very laborious and time-consuming process. An alternative procedure is hereby proposed to identify key radiation areas and control the structural-acoustic system by adding damping pads. Multiple scans are performed very close to the surfaces of interest acquiring the normal acoustic particle velocity distribution. The direct visualisation of this information can be used to find leakage as well as problematic modes across the structure. All data can be acquired with the vehicle in static conditions, using a monopole source or shaker as the source of excitation. The suggested measurement approach simplifies dramatically the refinement process of the damping package of an entire vehicle, reducing the traditional testing process to just a few days. Details about the measurement methodology as well as its implementation are explained in this paper along with an example in a car section which is validated with on-road tests. As shown, this approach provides an extensive amount of vibro-acoustic information for every vehicle section, ultimately helping to design an effective damping treatment.
Fernandez Comesana, D., Tatlow, J. (2018). Designing the damping treatment of a vehicle body based on scanning particle velocity measurements. In Proceedings of Aachen Acoustics Colloquium.