MODAL IDENTIFICATION OF BLADED DISKS BY TIME-FREQUENCY ANALYSIS OF THE NON-SYNCHRONOUS RESPONSE

被引：0

作者：

Carassale, Luigi ^{[1
]}

Guida, Roberto ^{[2
]}

Marre-Brunenghi, Michela ^{[2
]}

机构：

[1] Univ Genoa, Genoa, Italy

[2] Ansaldo Energia, Genoa, Italy

来源：

PROCEEDINGS OF ASME TURBO EXPO 2022: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, GT2022, VOL 8B | 2022年

关键词：

Vibration; system identification; wavelet transform; bladed disk; CONTINUOUS WAVELET TRANSFORM; SYSTEMS;

D O I：

暂无

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In some circumstances it is impossible to exploit resonance crossings to identify the modal properties of rotor disks. In these cases, the identification process must rely on nonsynchronous vibrations and becomes challenging for two reasons. First, the signals are weak (compared to the levels measured during resonance crossings) and random, thus an averaging procedure is necessary. Second, the dynamical system is time-variant due to the variation of the rotor speed. This paper presents a modal identification procedure formulated in the framework of the time-frequency analysis. A region of the time-frequency plane is stretched to map the system into a fictitious LTI system. Then, the PSD of the response is computed by an averaging procedure. Finally, the modal properties are estimated through an output-only modal identification algorithm. The procedure is applied to simulated and experimental data regarding a bladed disk of a steam turbine.

引用

页数：11

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