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.

通过测量频率响应函数（FRF），使用实验方法来分析现代产品的动态特性。对于单个测量，一致性在系统获取期间提供了在线检查。用于确定完整测量集一致性的更通用的工具是基于FRF或模态形状与数值模型的比较。它们是有用的工具，但它们依靠与可能无法反映实际系统行为的数值模型进行比较。本文旨在通过与完整的实验响应模型进行比较，开发一种综合的实验方法来检查单个测量的一致性。引入数值模型只是为了使实验模型能够使用“系统等效模型混合”方法进行扩展。整个公式是在频域中开发的，因此不需要过渡到模态域，这可能会从系统中删除物理上相关的信息。在频域中，可以评估整个感兴趣的整个频率范围内（不仅在自然频率范围内）FRF的一致性。这在基于频率的子结构领域中非常重要，在该子结构的FRF中，即使很小的误差（例如，反谐振的位置）也可能由于反演过程而导致错误的耦合结果。实验案例研究证明了该方法的有效性。