抄録
Now in the digital design era, the FEM model of the vehicle interior noise such as the road noise is becoming large and there are even models with 100 million of freedom. In the structure investigation, it's ideal to run the optimization analysis, but in fact some change plans from the initial structure are often prepared and the structure is investigated by checking each characteristic. In this case, the re-analysis, which shortens the re-analysis time by using the information about the dynamic characteristic and the structural change obtained from the initial structure model, is effective. Perturbation method and sensitivity analysis are representative examples of them. Each method has a weak point to restrict the scale of the change. So we invented a new method by which the structure can be practically changed without a scale limitation. Here we explain how this method enables to investigate the design more quickly and reduce the iteration times drastically in the
