Detection and Quantification of the Influence of Time Variation in Closed-Loop Frequency-Response-Function Measurements

作者：Pintelon Rik^*; Louarroudi Ebrahim; Lataire John

来源：IEEE Transactions on Instrumentation and Measurement, 2013, 62(4): 853-863.

DOI：10.1109/TIM.2013.2245183

• Best linear time-invariant (BLTI) approximation
• continuous time
• errors in variables
• feedback
• frequency response FRF)
• nonparametric modeling
• slowly time varying

Recently, a method has been developed for detecting and quantifying the time variation in frequency response FRF) measurements using arbitrary excitations. The following basic assumptions have been made: 1) The input is known exactly (generalized output error stochastic framework), and 2) the time-variant system operates in an open loop. The latter excludes any interaction between the time-variant system and the generator/actuator. In this paper, we extend the results of the work by Pintelon et al. to noisy input-output observations (errors-in-variables stochastic framework) of time-variant systems operating in a closed loop.

• 出版日期2013-4