Detecting a Time-Varying Behavior in Frequency Response Function Measurements
Detecting a Time-Varying Behavior in Frequency Response Function Measurements
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DOI：
10.1109/tim.2012.2197072
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发表时间：
2012-05
影响因子：
5.6
通讯作者：
J. Lataire;E. Louarroudi;R. Pintelon
中科院分区：
文献类型：
--
作者：
J. Lataire;E. Louarroudi;R. Pintelon
本文提供了数据驱动的工具来检测和量化的经典频率响应函数（FRF）测量中的被测系统的时间变化的影响。为了实现这一点，线性时变系统的最佳线性时不变近似的定义和估计使用现有的FRF估计。后一种估计的残差的分析揭示了频带，其中来自时间变化的贡献占主导地位的干扰测量噪声，因此，是显着的。所有的概念都说明了一个模拟和真实的测量的例子。
This paper provides data-driven tools to detect and quantify approximately the influence of the time variation of a system under test in classical frequency response function (FRF) measurements. To achieve this, the best linear time-invariant approximation of a linear time-varying system is defined and is estimated using existing FRF estimators. An analysis of the residuals of the latter estimation reveals the frequency band in which the contributions from the time variation dominates the disturbing measurement noise and, thus, is significant. All concepts are illustrated on a simulation and real measurement examples.