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Operational modal identification in the presence of harmonic excitation

机译：谐波激励下的运行模式识别

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摘要

The dynamic behavior of structures can be studied by the identification of their modal parameters. Classical modal analysis methods are based on the relation between the forces applied to structures (inputs) and their vibration responses (outputs). In real operational conditions it is difficult, or even impossible, to measure the excitation. For this reason, operational modal analysis approaches which consider only output data are proposed. However, most of these output-only techniques are proposed under the assumption of white noise excitation. If additional components, like harmonics for instance, are present in the exciting force, they will not be separated from the natural frequencies. Consequently, this assumption is no longer valid. In this context, an operational modal identification technique is proposed in order to only identify real poles and eliminate spurious ones. It is a method based on transmissibility functions.The objective of the proposed paper is to identify modal parameters in operational conditions in the presence of harmonic excitations. Identification is performed using a method based on transmissibility measurements and then with the classical stochastic subspace identification method, which is based on white noise excitation. These two methods are first applied to numerical examples and then to a laboratory test. Results validate the novel ability of the method based on transmissibility measurements to eliminate harmonics, contrary to the stochastic subspace identification approach.
机译：可以通过识别其模态参数来研究结构的动态行为。经典的模态分析方法基于施加到结构的力（输入）与其振动响应（输出）之间的关系。在实际运行条件下，很难甚至不可能测量激励。因此，提出了仅考虑输出数据的操作模式分析方法。但是，大多数这些仅输出技术都是在白噪声激励的假设下提出的。如果励磁力中存在其他分量，例如谐波，则它们将不会与固有频率分离。因此，该假设不再有效。在这种情况下，提出了一种操作模式识别技术，以便仅识别真实极点并消除虚假极点。这是一种基于传递函数的方法。本文的目的是在存在谐波激励的情况下识别运行条件下的模态参数。使用基于透射率测量的方法进行识别，然后使用基于白噪声激发的经典随机子空间识别方法进行识别。这两种方法首先应用于数值示例，然后应用于实验室测试。结果验证了基于透射率测量的方法消除谐波的新颖能力，这与随机子空间识别方法相反。

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