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Support of Dynamic Measurements Through Similitude Formulations
Experimental Techniques ( IF 1.6 ) Pub Date : 2021-04-02 , DOI: 10.1007/s40799-021-00457-1
A. Casaburo , G. Petrone , V. Meruane , F. Franco , S. De Rosa

Up to now, similitude methods have been used in order to overcome the typical drawbacks of experimental testing and numerical simulations by reconstructing the full-scale model behavior from that of the scaled model. The novelty of this work is the application of similitude theory not as a tool for predicting the prototype dynamic response, but for supporting, and eventually validating, experimental measurements polluted by noise. Two Aluminium Foam Sandwich (AFS) plates are analyzed with Digital Image Correlation (DIC) cameras. First, an algorithm for blind source separation problems is used to extract information about the excitation; then, SAMSARA (Similitude and Asymptotic Models for Structural-Acoustic Research Applications) similitude method is applied to both the force spectra and velocity responses of prototype and model. The reconstruction of force and velocity curves demonstrates that the similitude results are coherent with the quality of the experimental measurements: when the spatial pattern in resonance is recognizable, then the curves overlap. Instead, when the displacement field of just one model is not well identified, the reconstruction exhibits discrepancies. Therefore, similitude methods reveal to be an interesting tool for understanding if a set of measurements is reliable or not and their application should not be underestimated, especially in the light of the expanding range of approaches which can extract important information from noisy observations.



中文翻译:

通过相似度公式支持动态测量

迄今为止,为了通过从比例模型重建全比例模型行为来克服实验测试和数值模拟的典型缺陷,已经使用了相似方法。这项工作的新颖之处在于,相似性理论的应用不是作为预测原型动态响应的工具,而是用于支持并最终验证被噪声污染的实验测量结果。使用数字图像相关(DIC)摄像机分析了两个铝泡沫三明治(AFS)板。首先,针对盲源分离问题的算法被用于提取有关激励的信息。然后,将SAMSARA(用于结构声学研究的柔度和渐近模型)的相似性方法应用于原型和模型的力谱和速度响应。力和速度曲线的重建表明,模拟结果与实验测量的质量是一致的:当共振中的空间模式可识别时,曲线会重叠。取而代之的是,当仅一个模型的位移场无法很好地识别时,重建会出现差异。因此,模拟方法显示出是了解一组测量值是否可靠的有趣工具,并且不应低估它们的应用,尤其是鉴于可以从嘈杂的观测中提取重要信息的方法范围越来越广。然后曲线重叠。取而代之的是,当仅一个模型的位移场无法很好地识别时,重建会出现差异。因此,模拟方法显示出是了解一组测量值是否可靠的有趣工具,并且不应低估它们的应用,尤其是鉴于可以从嘈杂的观测中提取重要信息的方法范围越来越广。然后曲线重叠。取而代之的是,当仅一个模型的位移场无法很好地识别时,重建会出现差异。因此,模拟方法显示出是了解一组测量值是否可靠的有趣工具,并且不应低估它们的应用,尤其是鉴于可以从嘈杂的观测中提取重要信息的方法范围越来越广。

更新日期:2021-04-02
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