Finite element simulation and experimental study on elastic squirrel cage stiffness of gas turbine shaft system
In order to accurately predict the stiffness of the e-lastic squirrel cage structure,the genetic algorithm based on the stiffness theoretical formulation was adopted to optimize the geometric parameters of the squirrel cage,and a three-di-mensional finite element model for the optimized squirrel cage was established.The stiffness of a squirrel cage under Remote force and Bearing load were calculated and compared by using ANSYS software,and the effect of root fillet dimensions on the stiffness of the squirrel cage was analyzed.An elastic cage stiffness experimental system was designed and built,and the stiffness test results of the elastic cage specimens were com-pared with the numerical simulation results.The results show that the deviation between the stiffness calculated by finite el-ement method using Remote force and Bearing load and the stiffness tested in the experiment is within 3%.In the engi-neering design analysis of elastic cages,the finite element method can significantly improve the prediction accuracy of the stiffness of elastic cages compared to the theoretical formu-la method.
gas turbineaxis structureelastic squirrel cagestiffnessoptimizationfinite element simulationexperimen-tal study
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