抄録
In a vehicle body design which focuses on noise and vibration, it is necessary to achieve two contrary requirements, mass reduction and improvement of noise and vibration performance. For those requirements, experimental measurement and finite element analysis are applied. However, there are advantage and disadvantage in an experiment and a finite element analysis each. In the experimental measurement, it is possible to obtain the actual vibration, but the measurement of detail stress-strain distribution is difficult. The stress-strain distribution is necessity to find the contributing part to noise and vibration. On the other side, in the finite element analysis, it is possible to compute a detail stress distribution, but the prediction accuracy is low for structures with many joints like automotive body. In this paper, analytical method that hybrid the advantage of experiment measurement and finite element analysis is applied to dynamic problems. Morton et al. applied hybrid analysis method using measured displacement by Moiré interferometry or laser speckle interferometry as the boundary condition to the finite element analysis. In this report, we apply the hybrid finite element analysis to dynamic problems and verify the prediction accuracy. The vibration velocity of the region of interest was predicted by measuring the vibration velocity of the interface and giving the measured vibration velocity as the boundary condition of the finite element analysis. The vibration response of the region of interest can be predicted in the low frequency region. In the hybrid finite element analysis method, there is an advantage that it is not necessary to calculate the inverse matrix of the transfer function in the process of obtaining the vibration velocity of the region of interest.
