Quantification of Blade Vibration Amplitude in Turbomachinery

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Alexandra P. Schneider, B. Paoletti, X. Ottavy, C. Brandstetter
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引用次数: 0

Abstract

Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to modal scope limits, including a safety factor. According to industrial guidelines, this factor is chosen conservatively to ensure safe operation of the machine. Within the experimental campaign with the open-test-case composite fan ECL5/CATANA, which is representative for modern lightweight Ultra High Bypass Ratio (UHBR) architectures, measurements close to the stability limit have been conducted. Investigation of phenomena like non-synchronous vibrations (NSV) and rotating stall require a close approach to the stability limit and hence demand for accurate (real-time) quantification of vibration amplitudes to ensure secure operation without exhaustive safety margins. Historically, short-time Fourier transforms of vibration sensors are used, but the complex nature of the mentioned coupled phenomena has an influence on amplitude accuracy, depending on evaluation parameters, as presented in a previous study using fast-response wall-pressure transducers. The present study investigates the sensitivity of blade vibration data to evaluation parameters for different spectral analysis methods and provides guidelines for fast and robust surveillance of critical vibration modes.
涡轮机械叶片振动振幅的量化
涡轮机械叶片振动的实验监测通常基于安装在叶片上的应变片。其信号用于得出振动幅度,并与模态范围限制(包括安全系数)进行比较。根据工业准则,该系数的选择比较保守,以确保机器的安全运行。在对现代轻型超高旁路比(UHBR)结构具有代表性的 ECL5/CATANA 开放式复合风机进行的实验活动中,进行了接近稳定性极限的测量。对非同步振动(NSV)和旋转失速等现象的研究需要接近稳定性极限,因此需要对振动振幅进行精确(实时)量化,以确保安全运行,而无需用尽安全系数。以往使用的是振动传感器的短时傅里叶变换,但上述耦合现象的复杂性质会影响振幅精度,这取决于评估参数,如之前使用快速响应壁压传感器进行的研究所示。本研究调查了不同频谱分析方法的叶片振动数据对评估参数的敏感性,并为快速、稳健地监测关键振动模式提供了指导。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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