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The critical-speeds of the low-pressure and high-pressure rotors are solved by the finite element method and the modes of vibration under the critical rotational speeds are obtained. It is found that the vibration of both rotors under the high-order critical speed is more severe. Considering the coupling effect of the intermediate support, the influence of the intermediate support on the dynamic characteristics of the double-rotors is emphatically analysed. By calculating the critical speed of the double-rotor under the conditions of low pressure main excitation and high pressure main excitation, it is found that the intermediate support avoids the diversity of the critical speed of the double-rotor so that reduces the resonance probability. Compared with the vibration pattern of single rotor, it was found that the intermediate support can reduce the torsional deformation of the rotor and greatly reduce the vibration amplitude of the rotor. With the increase of the stiffness of the intermediate support, the critical speed of the two rotors also increases, but when the stiffness of the intermediate support increases to a certain value, the critical speed of the two rotors does not change. In addition, the stiffness of the intermediate support has more influence on the critical speed of the high order rotor than on the low order critical speed of the double-rotor.
Inspec keywords: finite element analysis; torsion; aerospace engines; rotors; vibrations
Subjects: Mechanical components; Numerical approximation and analysis; Finite element analysis; Vibrations and shock waves (mechanical engineering); General shapes and structures; Numerical analysis