Forced vibration test and accurate response prediction of rotating blisk
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摘要:
开展了实验室环境下的旋转整体叶盘强迫振动试验测试以及失谐整体叶盘高精度动力学建模和强迫振动响应预测研究。建立了基于叶片解谐振动测试的失谐整体叶盘高精度动力学建模和强迫振动响应预测方法。在实验室环境下开展旋转整体叶盘强迫振动试验，采用磁激励装置对旋转叶盘结构施加模拟的发动机阶次激励，实现了对旋转叶片所受非接触激振力的测量和数据处理，并为失谐整体叶盘强迫振动响应预测提供了输入信息。同时利用叶尖定时（BTT）测振技术，对旋转整体叶盘强迫振动响应实测与预测结果进行了关联分析。研究结果表明：通过静态整体叶盘解谐振动测试所建立的失谐整体叶盘动力学模型，能够准确预测旋转整体叶盘在发动机阶次激励下的强迫振动响应，在典型共振转速处的实测/预测叶片振幅空间分布的模态置信因子均大于0.96，在典型叶片一扭（1T）模态共振处所有叶片实测/预测振幅平均值的相对误差不超过−5.8%。
Abstract:This research focused on the forced vibration test of a rotating blisk in the laboratory condition, as well as its accurate dynamic modeling and forced response prediction. The method for accurate dynamic modeling and forced response prediction of a mistuned blisk test piece was developed based on the blade detuning tests. The forced vibration test of the rotating blisk was carried out in the laboratory condition. A set of magnetic units were employed to produce the simulated engine-order excitations. The non-contact force imposed onto the rotating blades can be measured and proceeded in order to provide inputs for the forced response prediction. Benefitting from the all-blade vibration measurement capability of the blade tip-timing (BTT) technique, a correlation analysis was performed between the measured and predicted response of the rotating blisk. The results revealed that the mistuned blisk model, which was constructed through the blade detuning tests for the blisk at rest, could predict the forced responses of the rotating blisk under engine-order excitations with high accuracy. Specifically, the modal assurance criterion used to quantitatively correlate the spatial distribution of the measured/predicted blade amplitudes at typical resonances was generally greater than 0.96. The difference between the averaged bladed amplitudes extracted from the measured/predicted responses at typical 1T blade mode resonances fell below −5.8%.
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Key words:
- blisk /
- mistuning identification /
- forced vibration /
- blade tip-timing (BTT) /
- response prediction
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图 2 整体叶盘设计模型的频率-节径图
Figure 2. Frequency-nodal diameter diagram of the blisk at nominal design
图 7 模态测试结果与仿真预测结果的比较
Figure 7. Comparison between experimental modal data and numerical predictions
图 9 在EO4激励下1号叶片的强迫振动响应对比
Figure 9. Comparison of forced responses at blade 1 under an EO4 excitation
图 12 一弯模态/EO4共振区间BTT实测振动响应
Figure 12. Measured responses by BTT at 1B mode/EO4 resonance
图 14 一弯模态/EO4共振转速处实测/预测叶片振幅
Figure 14. Predicted/measured amplitudes at 1B mode/EO4 resonance
图 15 整体叶盘一扭模态/EO20共振区间振动响应
Figure 15. Vibration responses of blisk at 1T mode/EO20 resonance
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