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Experimental framework for identifying inconsistent measurements in frequency-based substructuring

机译：用于识别基于频率的子结构中的不一致测量的实验框架

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摘要

The dynamic properties of modern products are analysed using an experimental approach through the measurement of frequency-response functions (FRFs). For an individual measurement, the coherence offers an online check during the system acquisition. More general tools for determining the consistency of the complete measurement set are based on a comparison of the FRFs or the modal shapes with a numerical model. They are useful tools, but they rely on a comparison with a numerical model that might not reflect the behaviour of the actual system. This paper aims to develop a comprehensive experimental method to check the consistency of individual measurements based on comparisons with the complete experimental response model. The numerical model is introduced only to enable the experimental model to be expanded using the System Equivalent Model Mixing method. The entire formulation is developed in the frequency domain, so that the transition to the modal domain, which might remove the physically relevant information from the system, is not required. In the frequency domain, it is possible to assess the consistency of the FRF across the entire frequency range of interest and not only in the region of the natural frequencies. This is of great importance in the area of frequency-based substructuring, where even small inaccuracies in the substructure's FRFs (e.g., the position of the anti-resonance) can lead to erroneous coupling results due to the inversion process. The experimental case study demonstrates the efficiency of the proposed approach. By removing the identified inconsistent measurements, it was possible to significantly increase the accuracy of the final coupling process.
机译：通过测量频率响应函数（FRFS），使用实验方法分析现代产品的动态特性。对于个别测量，相干性在系统采集期间提供在线检查。用于确定完整测量集的一致性的更多一般工具基于FRF的比较或具有数值模型的模态形状。它们是有用的工具，但它们依赖于与可能无法反映实际系统行为的数值模型进行比较。本文旨在开发综合实验方法，以检查基于与完整实验响应模型的比较的单个测量的一致性。介绍了数值模型，仅使用系统等效模型混合方法扩展了实验模型。整个配方在频域中开发，从而不需要向模态域的转换，这可能会从系统中移除物理相关信息。在频域中，可以评估FRF在整个频率范围内的FRF的一致性，不仅在自然频率区域。这在基于频率的子结构领域具有重要意义，其中甚至在子结构的FRF（例如，抗共振的位置）中的甚至小的不准确性可能导致由于反转过程导致错误的耦合结果。实验案例研究表明了提出的方法的效率。通过去除所识别的不一致测量，可以显着提高最终耦合过程的准确性。

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