Experimental structural dynamic modification with a beam element has its own innate error due to rotational and modal truncation. The rotational motion at the modification points, which are imperatively required but very difficult to measure, were interpolated by using continuous n-th order polynomial and cubic spline curve fitting using easily measurable translational motion. The modal truncation error can be eliminated in process of structural dynamics modification by using frequency response function, which has an entire modal information.
In this work, structural dynamic modification using interpolated rotational motion and frequency response function was proposed, to improve the reliability of the modification.
The proposed technique was checked with several simulation and real structure model and found that the method is quite reliable.
