Numerical simulation of the dynamic process of aero-engine blade-to-case rub-impact

Numerical simulation of the dynamic process of aero-engine blade-to-case rub-impact was conducted by explicit-implicit integration scheme. This took full account of low-frequency liner steady-state response and high-frequency nonlinear time-transient response due to the rub-impact. By taking the structure of a certain high-pressure turbine as example, the process of blade-to-case rub-impact was simulated, and the dynamic response characteristic of the blade during the process was analyzed. The results show that, the stress wave, which affects the stress distribution of blade, will be generated and propagated on the body of blade during the process of rub-impact; after the process of rub-impact, the dynamic response of blade is a decaying harmonic motion at the damped low-order natural frequency.