Relating to a dynamic engineering problem of a disc and blade model in a rigid and flexible coupling system,based on Hamilton's variational principle and finite element method,continuous dynamic equations,nonlinear complete coupling,and time dependant finite discrete dynamic equations of a flexible blade rotating around a fixed axis were derived.Influence of the variation of pre-twisted angles and a variable cross-section on the displacement response of a rotating blade tip was discussed.Results show that variation of a pre-twisted angle and the variable cross-section of a blade have some influence on displacement in the plane perpendicular to the rotating plane,resulting in a touch failure in the case of relatively great displacement.Methods and results in this paper can be used to guide the design of pre-twisted angles and variable cross-section blades.

Variation of pre-twisted angles and variable cross-sections in rotating blades can lead to touch failure in the plane perpendicular to the rotating plane, guiding blade design.

Dynamic analysis of a rotating blade with a rigid-flexible coupling,pre-twisted angle,and variable cross-section

Key Takeaway: Variation of pre-twisted angles and variable cross-sections in rotating blades can lead to touch failure in the plane perpendicular to the rotating plane, guiding blade design.