Research Based on Finite Element Simulation of Dry Friction Damping Characteristics of Serrated Crown Blade

• 1、School of Mechanical Electronic & Information Engineering, China University of Mining & Technology,Beijing, Beijing 100083
• 2、State Key Laboratory of Tribology, Thinghua University, Beijing 100084

Abstract：The performance of serrated crown blade damper was investigated systematically by researching the nonlinear response of plate blades with serrated crown. This paper, through the establishment of a three-dimensional model of a turbine blade with serrated crown, analyzed the influence regularity of the pre-tighten force and friction coefficient of the blade crown contact interface for the vibration characteristics of blade assembly. By virtue of using finite element theory and ANSYS software to calculate the contact friction behavior between blade crowns. The simulation results indicate that with the pre-tighten force increasing, the blades generated torsion and the contact area of the contact interface between the crowns changed signally; there exists an optimal pre-tighten force making the contact interface sliding displacement minimum; with the pre-tighten force increasing, the resonance frequency of the system increases, and when the pre-tighten force is large enough, the resonance frequency substantially maintains constant; as the friction coefficient increases, the contact interface friction stress increases, and it affects the maximum static friction force deciding when the contact interface began to slide. And so the pre-torque and friction coefficient have a significant impact on the serrated crown of blades friction damping, but also it provides a reference to explore the serrated crown blade friction damping further and blade design.

Keywords： engineering mechanics；vibration turbine blade finite element analysis