Calculation of optimal damping placement in a vehicle interior

摘要

Two processes were described that provided a practical approach to optimizing dampinglocations in a truck cab or automotive vehicle.The objective function of the maximum SPL peaks due to structure-borne noise was foundto be erratic and easily subject to finding local minimums. Comparision of the simulation resultswith various constraints for damping material demonstrated this feature. When using anautomated optimization routine it is best to run the simulation numerous times to look for arobust solution and explore different local minimums.The velocity sum method showed promise to provide additional understanding of the cabvibration environment and to help in selecting local choices in candidate damping panels. It wasalso found to be an excellent tool to use for discussions of the overall noise treatment plan.Conclusions from this method were similar to those made from multiple optimizationsimulations.The approach outlined of evaluating the interior acoustics for a range of conditions – in thiscase an entire engine run-up was found to be an effective tool for making decisions of theacoustic treatment of the vehicle.