基于结构声强法的机匣振动能量传递特性

doi:10.7527/S1000-6893.2019.22938

Abstract

Abstract: To analyze the distribution rules and transmission characteristics of instantaneous and steady vibration energy carried by longitudinal wave, shear wave, twist wave, and flexural wave on the casing subjected to the rotor unbalanced forces, the structural intensity method is extended into a matrix form and applied to the field of aero-engines. The dual rotor-support-casing coupling model subjected to the rotor unbalanced forces is established. The calculation system consisting of the finite element tool and the in-house program is used to compute and visualize the instantaneous and steady structural intensity fields of the casing for these different types of vibration waves. Moreover, the relationship between the structural intensity and the general vibration characteristics is derived and analyzed from the basic motion equation. The results show that the longitudinal wave vibration energy of the casing passes through the flange and then transmits along the circumferential direction, and the vibration energy carried by the shear wave and the twist wave can be transmitted through the flange and then transmits along the axial direction on the casing. Second, the vibration energy of the support is first transmitted to the casing in the form of the bending wave, and the vibration energy is converted into different types of vibration waves during the transmission along the main path on the casing. Third, the structural intensity generates an intrinsic physical connection between the structure vibration characteristics by the energy parameters such as the kinetic energy change rate, the strain energy change rate, and the damping dissipation. The control of the structure vibration is essentially the control of the vibrational energy flow. The conclusions can provide some guiding significance for the vibration attenuation of the casing and the whole aero-engine.

Key words: casing, structural intensity method, vibration wave, vibration energy, transmission characteristic, whole aero-engine vibration attenuation

CLC Number:

V231.92

MA Yingqun, XU Meng, ZHANG Kai, ZHAO Wei, ZHAO Qingjun. Vibration energy transmission characteristics of casing based on structural intensity method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(9): 222938-222938.

References 34

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Vibration energy transmission characteristics of casing based on structural intensity method

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