基于非线性阻尼的航空发动机高压转子拉杆结构装配检测方法

Abstract

Abstract: In order to improve the quality of the assembly operation for rod fastening rotors of high pressure spool in an aero-engine, this paper presents an assembly variation detection method based on nonlinear damping identification. A combined damping model is applied to describe the nonlinear contact in a rod fastening rotor, and the equation for nonlinear damping identification based on Hilbert-Huang transform (HHT) is found by a step-by-step integration of the energy dissipation equation. Then, dynamic experiments are carried out in three different scenarios, including a normal assembly, preload changes of a single bolted joint and two separate bolted joints. The dynamic response data are processed using the proposed nonlinear damping identification method. A strong correlation is observed between the changes of the preload and the nonlinear damping which represents the amount of nonlinear energy dissipation. In this way, the validity of the proposed assembly variation detection method is confirmed.

Key words: nonlinear damping, assembly variation detection, Hilbert-Huang transform, high pressure spool, rod fastening

CLC Number:

V263.2

ZHANG Ziyang, XIE Shousheng, PENG Jingbo, TENG Jian, ZHAI Xusheng. Assembly Variation Detection for Rod Fastening Rotor of High Pressure Spool in Aero-engine Based on Nonlinear Damping Identification[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, (3): 470.

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Assembly Variation Detection for Rod Fastening Rotor of High Pressure Spool in Aero-engine Based on Nonlinear Damping Identification

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