变转速工况下叶尖计时信号趋势项解析及验证

doi:10.7527/S1000-6893.2022.26980

Abstract

Abstract:

As an effective method to monitor the vibration parameters of rotating blades， non-contact blade tip timing method has been widely used in aeroengine blade vibration monitoring in recent years. However， there are still some components that are difficult to be quantitatively analyzed in the measurement results， such as trend term. Based on the principle of blade tip timing， the components in the time domain signal of tip timing are analyzed， the influence of nonlinear change of speed on the measurement results is studied， and the error identification and correction method of once per revolution based tip timing signal is proposed. A tip timing digital model integrating the trend term caused by speed change and aerodynamic resistance is established. The accuracy of the proposed method is verified by numerical simulation， and then compared and verified by using the tip timing data and dynamic stress data of aeroengine compressor blade test-rig. The result shows that the correlation coefficient between tip displacement trend term and dynamic strain trend term calculated by the proposed method is 0.986， which has good consistency. This method has important engineering application value in reducing the uncertainty of blade tip timing measurement results and realizing the comprehensive monitoring of blade operation state.

Key words: blade tip timing, trend term, variable speed, aerodynamic resistance, blade vibration

CLC Number:

Xulong ZHANG, Weimin WANG, Tianqing LI, Yulong LIN, Xinxi AI, Zhenguo WANG. Analysis and verification of trend term for tip timing signal under variable speed condition[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(5): 426980-426980.

Figures/Tables 13

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Table 1

Simulation parameters

参数	取值	参数	取值
噪声	幅值为0.01的均匀白噪声
$n b$	18	$α (O P R, 1)$ /（°）	90
$R$ /mm	100	$f B$ /Hz	80
$β 1$ /（°）	78	$λ$ /（mm·Hz^-1）	0.002
$A 0$ /mm	0.001 5	$φ n$	π/16
$Q$	800	$d c$ /mm	0.01

Table 1

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Analysis and verification of trend term for tip timing signal under variable speed condition

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