燃气涡轮发动机轴承故障频发,然而,轴承故障信号经过复杂的薄壁结构传至机匣表面衰减严重,致使基于振动信号分析的轴承故障诊断难度增大。为此,从轴承故障特征产生机理出发,在薄壁支承系统固有特性分析的基础上,基于周期冲击激励与振动响应时频域关联分析,阐释了轴承冲击激励下,复杂薄壁支承结构测点的响应特征。相关结论可以为基于共振解调的轴承故障诊断提供参考,对具有薄壁支承结构的燃气轮机轴承故障预警或诊断有一定的参考价值。
Abstract
The bearing of an gas turbine engine runs out of work from time to time.However, the failure signals of the bearing are decayed and weakened seriously after being transmitted to the surface of the casing through a complicated thin-walled structure, which makes it rather difficult to analyze and diagnose the bearing failure by using its vibration signals.In order to solve this problem, the correlation between the periodic impact excitation and vibration responses in time-frequency domain was analyzed based on the analysis of the inherent characteristics of the thin-walled support system and the mechanism of bearing failure characteristics.Then, on this basis, the response characteristics of the complicated thin-walled support structure at measuring points were explained.The relevant conclusions provide worthy information for bearing fault diagnosis based on resonance demodulation, and have certain reference value for the fault early warning or diagnosis of gas turbine engine with thin-walled support structures.
关键词
薄壁支承结构 /
轴承故障 /
响应机理 /
有限元分析
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Key words
thin-walled support structure /
bearing failure /
response mechanism /
finite element analysis
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