期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 82, 期 -, 页码 394-411出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2016.05.030
关键词
Bayesian analysis; System identification; Stochastic models; Neural networks; Damage assessment
资金
- Sandia National Laboratories, Albuquerque, New Mexico [BG-7732]
- 111 project fund from Tongji University [B14017]
- China NSFC [50838004]
This paper presents a dynamic fuzzy stochastic neural network model for nonparametric system identification using ambient vibration data. The model is developed to handle two types of imprecision in the sensed data: fuzzy information and measurement uncertainties. The dimension of the input vector is determined by using the false nearest neighbor approach. A Bayesian information criterion is applied to obtain the optimum number of stochastic neurons in the model. A fuzzy C-means clustering algorithm is employed as a data mining tool to divide the sensed data into clusters with common features. The fuzzy stochastic model is created by combining the fuzzy clusters of input vectors with the radial basis activation functions in the stochastic neural network. A natural gradient method is developed based on the Kullback-Leibler distance criterion for quick convergence of the model training. The model is validated using a power density pseudospectrum approach and a Bayesian hypothesis testing-based metric. The proposed methodology is investigated with numerically simulated data from a Markov Chain model and a two-story planar frame, and experimentally sensed data from ambient vibration data of a benchmark structure. (C) 2016 Elsevier Ltd. All rights reserved.
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