Dynamic Optimization Design And Dynamic Response Analysis Of RSS Support

The gas turbine is a highly efficient gas turbine power generation, especially in thepast decade, an increase in the frequency of occurrence of geological disasters, moreand more people tend to be as clean and low-carbon gas turbine power generationequipment, the gas turbine as a standard dynamic-intensive and high-tech machineryand equipment, has high technological content and a large mechanism characteristics.As a high-tech carrier gas turbine. In large-scale power equipment representatives thedevelopment level of gas turbine of a category in theory and engineering progress, isthe dominant technology in the twenty-first century. Final construction set newmaterials, new technology in an industrial gas turbine. Has a very excellent strategicposition.RSS（Rotationally Symmetric Struts）support in the end of engine turbine of gasturbine, support the entire core components of the gas turbine shafting. Large andcomplex structure. The most important is, firstly, bearing system to ensure stableoperation. Secondly, high temperature and high pressure gas by using intervalbetween six support plate and diffuser insulation for discharge channel. As can beseen, RSS stands to bear the weight of the rotor and transmission torque and otherdynamic load withstand high temperatures, prone to bending, torsional deformationand thermal expansion will cause dynamic vibration. RSS support under the action ofmany dynamic load, pressure increase may cause the amplitude of the dynamicstability of the changes, even cause structure resonance. Therefore, RSS standsstructural design work will directly affect the stability of the merits of the gas turbineshafting. Therefore, it is necessary to RSS supports for dynamic structure optimization,thus seeking to adapt to all sectors of mode shapes and dynamic response of the bestsupport structure. ANSYS Workbech DX module using RSS support for the dynamicoptimum design. Conducted Innovation from the following aspects: 1) Rotationally Symmetric Struts support will be an analysis object, conductedRSS support for parametric modeling, set the mechanical and geometric boundaryconditions, and the prestressed modal analysis in ANSYS workbench, get the first tenorder support formation.2) RSS support to identify and extract the equivalent static load, the first threekey parts of an equivalent static load as displacement load way to loaded and importthe original model, carried out static analysis, and the modal vibration mode and theequivalent static load deformation were analyzed and validated.3) On the basis of RSS support structure subjected to the bearing force and therotor motion torque generated when the dynamic response, determine the RSS supportstructure needs to be optimized modal frequencies. In the first three modal formationand the stress of RSS support as the objective function，the four size parameters of thestruts as design variables of the RSS structure, for dynamic optimization.4) After loading on one, two, third-order formation displacement of optimizedRSS support and the original model of prestressed modal analysis and harmonicresponse analysis, model amplitude and the dynamic stress proved significantlyreduced after optimization, natural frequency increases, effectively avoid theresonance range, strengthen the stability of the shaft. optimization results reasonableand effective.5) The use of the first three displacement formation of RSS support werecalculated the radial stiffness and stiffness matching design. RSS suport in reducingthe stress and strain at the same time, RSS support for the radial stiffness obtainimproved.