Direct Response Estimation of Modified Structure without Using Exciting Force

－Verification by Beam Model－

Abstract

The proposed method which estimate the responses of vibration without using exiting forces is found useful for the practical development in industries, even if numbers of the measuring points and used modes are reduced, and Guyan’s static reduction is applied for the beam model. The responses of vibration are usually calculated by modal parameters and exiting forces, however force estimations spend the long time and manpower. The proposed method is able to calculate the responses after the modification of a structure by (a) prototype vibrations of designated points on running conditions, (b) modal parameters of the structure before modification and (c) stiffness and mass matrix difference of modification area before and after modification. These data are usually already available for noise and vibration development, so that the proposed method does not need additional man power.