Study On Steam Turbine Inlet Valve Urgent Closing Impact

Based on energy method, this paper works on steam turbine inlet valve structureimpact while closing urgently. Synchronous deformation is required by energy methodgenerally, which is difficult to meet on elastic dynamics. This thesis divides the structureinto two part according to structure rigidity so that deformation keeps Synchronouspartially and approximatively. Energy method is applied partially. To the lever systemtwice-impact is supposed and added up conservatively. The lever deformation energy iscalculated by theory of strength of material. and valve disc deformation is calculated byfinite-element method.Impact force and mass force are appended on structure at the same time ondeformation energy calculating. The same acceleration is applied anywhere in thestructure.the deformation influence on acceleration is ignored in this thesis in order tomass force could be appended on structure directly and deformation energy be calculatedeasily. Complex dynamics method is replaced by Statics method.