Mid-Frequency Prediction Accuracy Improvement for Fully Trimmed Vehicle using Hybrid SEA-FEA Technique
The concept of using the capabilities of Statistical Energy Analysis (SEA) as the basis for a hybrid technique together with Finite Element Analysis (FEA) or measurements to make acoustic and vibration predictions for the mid-frequency range has been previously established. With advancements in computer memory and speed, FEA calculations such as drive-point mobility and mode counts can now be obtained for some vehicle components or assemblies up to 1000 Hz. This allows for a larger mid-frequency range to be modeled with a hybrid SEA-FEA model when the system is not suitable for modeling with either pure SEA or pure FEA. This can enable a big improvement of the speed and accuracy of a structural-acoustic prediction in the mid-frequency range and can be the best possible analytical prediction in this frequency range when hardware and measured data are not available or testing is to be reduced.