Dynamic Research Of Rigid-Flexibly Coupling System In Stream Turbine Blades

In this paper, the problem of rigid-flexibly coupling dynamics in some blades are researched, the dynamic model of elastic body in the rigid disk blade consolidation, and a large overall motion occurs in the horizontal plane.The problem of rigid-flexibly coupling in stream turbine blades ,showing between large overall motion of the centre rigid body and small deformation of the blades in intensely coupling, in the course of their analysis in the paper ,which bases on Lagrange equation, the dissertation has considered the coupling deformation items, which are ignored in structure dynamics , and accurately describes the deformation motion of elastic body . However, these deformation variables will bring significant effect on dynamics of elastic structures in case of coupling with large overall motions, if they are ignored will lead to error result. In the paper, reasonably describing blades deformation motions and considering the shape of blades affect deformation motions, couple with Hamilton principle, and the kinetic equation of constant section blades and cross section blades are established separately. the movement partial differential equations of infinite dimensional continuous system was discreted by finite element method ,then the suitable finite dimensional dynamic equation for programming was got, it mainly adopts Newmark numerical integral method to solve them.The displacement response of blades end applied numerical simulation by using the computer language Matlab and simulated deformation motions in the system of constant section blades and cross section blades. Meanwhile, it applied ANSYS soft construct three-dimensional modeling in constant section blades and cross section blades, entire model effected mode analysis, the simulation has figured out inherent frequency and mode shape.The system differential equations of constant section blades and cross section have got in the paper, and adopted the analysis method and conclusions have a certain theoretical significance and value of projects.