Method for estimating dynamic characteristics of locally modified structure based on frequency response function

The invention discloses a method for estimating dynamic characteristics of a locally modified structure based on a frequency response function. Firstly, after the local modification position of the structure and the modification content are determined (the local modification of the structure refers to adding additional rigidity, additional mass and additional damping to some local positions of theoriginal structure); then an original structure frequency response function is acquired (excitation points and response measurement points involved in the frequency response function should cover thelocal modification position points of the structure), and finally the frequency response function of the modified structure is calculated according to a calculation formula provided by the method. The frequency response function of the locally modified structure at multiple points can be calculated at a time on the basis of the frequency response function of the original structure, so that the dynamic characteristics of t