The invention belongs to the technical field of inherent
frequency detection, and particularly relates to a method for testing a blade inherent frequency excitation point and a detection position through a hammering method. According to the technical scheme, the method comprises the following steps that (1)
modal analysis is carried out on a blade based on a
finite element simulation platform,
modal shape displacement vectors of all orders of the blade are extracted, and a
modal displacement matrix phi s is constructed; 2) inputting the modal displacement matrix phi s into an ODP divided ADDOFV
algorithm, calculating to obtain a maximum
energy coupling efficiency point, and determining an optimal excitation point; and (3) constructing a modal
kinetic energy contribution matrix of the candidate measuring points based on an effective independence method, gradually eliminating redundant measuring points which have the minimum influence on target modal orthogonality by adopting a rank
elimination criterion, and finally outputting an optimal detection position of a sensor number constraint condition. According to the method, the frequency leakage phenomenon easily occurring in a traditional hammering method can be solved, and the detection precision and the detection efficiency are greatly improved.