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Identification of the test setup influence on the modal properties of a short wind turbine blade during fatigue test
Measurement ( IF 3.364 ) Pub Date : 2021-01-08 , DOI: 10.1016/j.measurement.2020.108960
Marcin M. Luczak; Riccardo Riva; Süleyman C. Yeniceli; Steen Hjelm Madsen; Emilio Di Lorenzo

Modal testing of different test artefacts requires a multitude of decisions to be taken before the test, active experiment and analyses stages of the entire testing campaign. Modal test is often performed only once, and one of its major application is to validate the numerical model. The test-related decisions may impair the quality of the test results and in turn the following correlation and model updating procedure. The current paper provides a systematic approach for the parametric study of the test setup influence on the blade modal properties. The same wind turbine blade has been configured in four different test setups, including heavy instrumentation of the blade for the fatigue certification tests. The main objective of the research was to provide a comprehensive assessment of the impact of the test setup on the modes. Experimentally supported evidence has been found that mounting blade on the test block modifies the system structural dynamics. Not only existing global blade modes receive a shift in frequencies, but also new coupled modes may emerge. A new finding of the presented research is an experimental based characterisation of the impact of heavy excitation equipment for fatigue test. Adding exciters of a mass nearly equal of the blade mass has little influence on the identified natural frequencies of the first two modes, while lower all frequencies from the third mode onwards. The structural damping ratios are also affected, and generally increased. A vibration engineering standard free-free boundary conditions with the impact hammer excitation serves as a baseline model, to which the other test setup are compared. The estimated modal models of the intact blade will serve as a reference for the modal based damage detection methods application.



中文翻译:

在疲劳测试期间,测试设置的确定对短风轮机叶片模态特性的影响

对不同测试伪像的模态测试需要在测试,主动实验和分析整个测试活动的各个阶段之前做出许多决定。模态测试通常仅执行一次,其主要应用之一是验证数值模型。与测试相关的决策可能会影响测试结果的质量,进而影响以下相关性和模型更新过程。本文为测试设置对叶片模态特性的影响进行参数研究提供了系统的方法。相同的风轮机叶片已经在四种不同的测试设置中进行了配置,包括用于疲劳认证测试的重型叶片工具。该研究的主要目的是对测试设置对模式的影响进行全面评估。实验证明,在测试块上安装刀片会改变系统的结构动力学。不仅现有的全局刀片模式收到频率变化,而且可能会出现新的耦合模式。本研究的一项新发现是基于实验的重型励磁设备对疲劳测试的影响表征。加上质量几乎等于叶片质量的激励器对确定的前两种模式的固有频率影响很小,而从第三种模式开始降低所有频率。结构阻尼比也会受到影响,并且通常会增加。带有冲击锤激励的振动工程标准自由边界边界条件用作基线模型,将其与其他测试设置进行比较。

更新日期:2021-01-13
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