Model correction-oriented gas turbine casing modal test method

The invention discloses a model correction-oriented gas turbine casing modal test method, which belongs to the technical field of structural dynamics test and analysis, and comprises the following steps: carrying out a radial free modal test on a gas turbine casing to obtain real number test modal parameters; establishing an initial finite element model of the gas turbine casing, obtaining a calculation modal parameter through modal analysis, and projecting a calculation modal shape vector to a test modal shape vector direction; and according to the frequency relative error FRE, the modal confidence factor MAC and the cyclic group rotation MAC, completing correlation matching of the calculation modal and the test modal. According to the method, the flow of the radial free modal test of the gas turbine casing is standardized, the suspension mode of the casing, the arrangement principle of test knocking points and vibration sensors, traversal of notes of knocking and the implementation method of complex modal r