260 / 2021-04-15 17:21:00

Vibration Characteristics Analysis of Integrally Shrouded Circle Blades Considering Contact Features

Shrouded group blades,Vibration Characteristics,Contact theory,Nonlinear response

This paper studies the vibration characteristics of the integrally shrouded circle blades. The semi-analytical method and Timoshenko beam theory are used to establish the dynamic model of the integrally shrouded circle blades with elastic support. Based on the contact mechanics theory, the nonlinear contact force model considering the damping effect and the stick-slip friction model considering the variable normal load are established, and the effects of installation angle and shroud mass are considered. The Lagrangian equation is utilized to solve the differential motion equation and the Galerkin method is used for discretization. Then, taking the rotating speed, contact angle and friction coefficient as the research parameters, the vibration response of the integrally shrouded circle blades are investigated. The results show that: when the rotation speed increases, the blades will possess multiple different periodic motions. The contact angle has an obvious effect on the movement of the blade. When the friction coefficient increases, the blades mainly change alternately in single period, double period and multiple periods.