A systematic method to select the measurement and excitation points for effective modal testing is proposed. First, master degree of freedom(DOF) is determined so as to minimize errors between the responses of a full order model and the responses estimated based on the master DOF. The criterion named 'driving point modal constant(DPMC)', which is closely related to the magnitude of peaks at natural frequencies, is used to select the point of excitation.
In this work, mode shape of the full order model is obtained from transformation of that of master dofs. The feasibility of the proposed method is demonstrated through applications to modal testing on one dimensional cantilever beam, aluminum plate, and two dimensional part of a passenger car.
