Method for computing bending rigidity of disc and drum combination interface of rotor of aero-engine

Abstract

The invention discloses a method for computing the bending rigidity of a disc and drum combination interface of a rotor of an aero-engine, and belongs to the field of structural mechanics for determining the rigidity of combination interfaces. The method includes particular steps of 1), performing equivalence on external bending moment; 2), analyzing stress on drums; 3), deriving an analytical expression for deflection angles of connecting rings of the drums under the effect of the bending moment by the aid of an elastic deformation theory; 4), determining values of contact parameters in the expression for the deflection angles psi1 on the basis of nonlinear finite element simulation analysis; 5), deriving a relative rotation angle of the disc and drum combination interface from the deflection angles of the connecting rings of the drums and further acquiring an analytical expression for the bending rigidity of the disc and drum combination interface. The method for computing the bending rigidity of the disc and drum combination interface of the rotor of the aero-engine has the advantages that the bending rigidity of the disc and drum combination interface is computed in an analytical manner, and accordingly influence of structural parameters of the disc and drum combination interface, pre-tightening force and the external bending moment on the disc and drum connection rigidity can be visually reflected; contact-related parameters in the analytical expressions are acquired by means of nonlinear finite element analysis, so that the computed bending rigidity of the disc and drum combination interface is close to actual conditions.

Description

technical field [0001] The invention belongs to the technical field of structural mechanics for determining combined interface stiffness, in particular to a method for calculating the bending stiffness of an aero-engine rotor-drum-drum combined interface. Background technique [0002] In an aero-engine, the disc-drum rotor consists of a disc, a drum and a shaft, and the discs and drums at all levels are bolted or welded together. Such as figure 1 The disc-drum rotor in the fan section of a certain type of aero-engine shown is composed of a first-stage disc 1, a first-stage drum 2, a second-stage disc 3, a second-stage drum 5, and a third-stage disc 6. The first-stage drum 2, The secondary drum 5 is a thin-walled short cylindrical shell structure, which connects the primary wheel 1, the secondary wheel 3, and the third wheel 6 to transmit torque; the primary wheel 1 and the primary drum 2 They are combined together by welding, and the secondary disc 3, the secondary drum 5,...

AI Technical Summary

Problems solved by technology

The method of using experimental measurement and finite element analysis to determine the bending stiffness of the combined interface takes a lot of time and cost, and can only obtain the stiffness value under a certain set of specific parameters, which cannot reflect the impact of structural parameters and loading conditions on the stiffness of the combined interface of the disc and drum. law of influence

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