Influence of Fir-Tree Tenon Blade Parameters on Blade Dynamic Characteristics

In this paper, based on the theory of elastic structure analysis, considering rotational softening and centrifugal stiffening blade, dynamic model fir-tree rotating blade macroslip hysteresis dry friction contact surface tenon are established. Based mechanics, pressure distribution is innovatively established relationship between fit clearance has been derived. After discretized by finite element method, equation solved iteratively Newmark-β numerical integration method. According to influence change angle forced response stress Finally, some novel conclusions obtained analyzing distribution, angle, coefficient, speed, aerodynamic excitation vibration characteristics. It provides a scheme relevant basis for design development blades with most damping effect at different speeds in industrial practice.