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In the numerical analysis of the eigen behaviour of blade an important role is played by initial pre-stressing due to rotation and pressure of flow. In everyday practice we used to neglect influence of working fluid - dumping of steam and local change of elastic properties of gas which may lead to self excited vibrations.
In a majority of numerical simulations, the finite state of deformation is first calculated, following which small, linear vibrations are superimposed on the finite state. This paper is devoted to refinement and assessment of the basic Eckart superimposed eigencharacteristics problem simultaneously stated in fluid and solid state structures.
Eckart’s coupled approach leads to variational structure-fluid coupling in the so-called acoustic approximation. In order to verify the feasibility of the unsymmetrical Eckart approach, finite element discretization and a calculation example of a blade frequency calculation in steam are presented. The calculated results are compared with traditional extracted vibrational properties of given blade.