Structural component holographic vibration mode testing method based on limited reference points

The invention relates to the technical field of component fault diagnosis, in particular to a structural component holographic vibration mode testing method based on limited reference points. The method comprises the steps: dividing measuring points on the structure into observation points and reference points, wherein the reference points are actual measuring points, the number is limited, and the observation point is a virtual measurement point; performing a hammering test on the measuring points to obtain response data of the observation points and the reference points; calculating a frequency response function H1(omega) between the observation point and the exciting force, and calculating a frequency response function H2(omega) between the reference point vibration and the exciting force; selecting an analysis frequency omega, and extracting numerical values at corresponding frequency points in the frequency response function as a group of test data; carrying out the hammering test at different points, an