Simulation analysis method and system for dynamic response of three-dimensional blade tip gap of crack-containing blade

The invention discloses a dynamic response simulation analysis method and system for a three-dimensional blade tip gap of a crack-containing blade, and the method comprises the steps: enabling a crack to be equivalent to a radial extension spring of the blade for the radial vibration of the blade, and calculating the inherent frequency and vibration mode equation of the radial vibration of the blade; aiming at blade bending vibration, enabling the crack to be equivalent to a torsion spring and an extension spring in the width/thickness direction of the blade, and calculating an inherent frequency of the blade bending vibration and a vibration mode equation of displacement and a section corner caused by bending; a uniform-section torsion blade with penetrating cracks at the tail edge is used as a research object, according to the Hamiltonian principle, a dynamical model of the blade with the cracks is established in combination with a Galerkin method, the dynamical model is solved, and the dynamic response of