涡轮机叶片同步振动参数辨识方法研究(实验研究)

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (17) : 127-133.

论文

王维民，任三群，陈立芳, 邵化金

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Investigation on the Method of Blade Synchronous Vibration Parameter Identification (Experimental)

Weimin Wang Sanqun Ren Lifang Chen Shan Huang

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摘要

为满足工程应用环境中用尽可能少的传感器和更紧凑的安装空间中实现叶片振动的精确测量，在叶尖定时测量方法的基础上，提出并实验研究了基于变速扫频拟合和辅助参数全局自回归法（GARIV法）相结合来辨识叶片同步振动时的振动参数。建立了高速直叶片实验台（最高转速45000r/min, 叶尖线速度322.8m/s）。在实验研究过程中，完成了叶片同步振动的参数辨识（中心频率、振动最大幅值、相位、振动恒偏量和倍频值），准确绘制出安装6个磁铁激励下的叶片振动坎贝尔图。同时对不同激励个数时叶片谐振动做了实验研究和分析。通过对比叶片的预应力模态计算结果和实验辨识结果， 6%。该方法可为叶片故障预警、动应力非接触测量提供技术途径。

Abstract

Accurate measurement of blade vibration with the use of fewer sensors and more compact installation space is indispensable for engineering applications. Based on the measurement method of BTT, the combination of the nonlinear least squares fitting and GARIV method is proposed and experimentally studied to identify the synchronous vibration parameters of blade. A high-speed straight blade test bench was established (the maximum speed is 45000rpm, and the blade tip velocity is 322.8m/s). In the experimental study, the parameter identification of synchronous vibration of blade is completed and the Campbell diagram of blade vibration is accurately plotted under the excitation of six magnets. Meanwhile, the experimental study and analysis on the harmonic vibration of blade with different numbers of excitation. The deviation of the dynamic frequency of blade between experimental result and simulation result is less than 6%. This method can provide a technical approach for blade fault early warming and non-contact measurement of dynamic stress.

导出引用

王维民，任三群，陈立芳, 邵化金. 涡轮机叶片同步振动参数辨识方法研究(实验研究)[J]. 振动与冲击, 2017, 36(17): 127-133

Weimin Wang Sanqun Ren Lifang Chen Shan Huang. Investigation on the Method of Blade Synchronous Vibration Parameter Identification (Experimental)[J]. Journal of Vibration and Shock, 2017, 36(17): 127-133

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