Dynamic Characteristics of a Rotating Blade with a Dovetail Fixture

Considering rotation-induced centrifugal stiffening, spin softening, and Coriolis effects, the reduced dynamic model of a rotating blade with dovetail fixture is established in ANSYS environment via fixed-interface method for higher computational efficiency lower memory consumption. Then some parameters such as speed, friction factor, stator number affecting nonlinear vibration responses system under combined actions aerodynamic force, gravity are elaborately discussed. The results show that: (1) contact-induced nonlinearity between tenon mortise mainly frequency multiplications excitation frequency; (2) larger factor magnitude contact pressure resonance frequency, while uniform continuous distribution; (3) resonant mode caused by force primarily characterized first-order bending system.