In order to study the method of blade vibration response analysis under airflow excitation

the aerodynamic excitation force prediction method was established. The nonlinear harmonic method was used to conduct three-dimensional unsteady flow analysis of the blades

obtain the fluctuating pressure on the blade surface

compile the flow-solid conversion program

and calculate the aerodynamic excitation force on the blade. The aerodynamic damping analysis method for blades was established. Based on the energy method and the weak coupling analysis method

the fluid-solid weak coupling analysis was carried out for blades and flow fields. The aerodynamic negative work done by aerodynamic forces on moving blades was equivalent to the work done by viscous damping force

and the modal aerodynamic damping ratio of rotor blades was obtained. The vibration response analysis method of blade excited by airflow was established

and based on aerodynamic excitation force and modal aerodynamic damping ratio of blade

modal superposition method was adopted. Using this method

the aerodynamic excitation force

the modal aerodynamic damping ratio of the first eight modes and the vibration response of the rotor blade under the combined action of the aerodynamic excitation force and the aerodynamic damping were calculated for the rotor stator blade array model of the 1.5-stage compressor in the engine. The results showed that the vibration stress reached 100 MPa.