Analysis of mid-frequency vehicle structure noise with FE-SEA hybrid method

The traditional Finite Element Method (FEM) and Statistical Energy Analysis (SEA) are widely used in predicting structure noise of vehicles. However, these two kinds of methods both have defects in solving the Mid-Frequency problems. In this work, a hybrid FE-SEA vehicle modal is built to analysis the structural-acoustic system over frequency range 200-500 Hz. Experiments are carried out to acquire interior noise and excitation signals from engine. Contrast between predicted noise and test results shows the accuracy of this new method. The simulation results are then analyzed based on power contribution of plates and energy flow theory. An optimization is also executed by changing the glass laminates of front windshield, which shows a decrease in cab noise level.