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Combined selection of the dynamic model and modeling error in nonlinear aeroelastic systems using Bayesian Inference

Journal Article · · Journal of Sound and Vibration
 [1];  [2];  [3];  [4];  [5];  [6];  [1]
  1. Carleton Univ., Ottawa, ON (Canada)
  2. Carleton Univ., Ottawa, ON (Canada); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. US Naval Academy, Annapolis, MD (United States)
  4. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  5. Royal Military College of Canada, Kingston, ON (Canada)
  6. India Institute of Science, Bangalore (India)

Here, we report a Bayesian framework for concurrent selection of physics-based models and (modeling) error models. We investigate the use of colored noise to capture the mismatch between the predictions of calibrated models and observational data that cannot be explained by measurement error alone within the context of Bayesian estimation for stochastic ordinary differential equations. Proposed models are characterized by the average data-fit, a measure of how well a model fits the measurements, and the model complexity measured using the Kullback–Leibler divergence. The use of a more complex error models increases the average data-fit but also increases the complexity of the combined model, possibly over-fitting the data. Bayesian model selection is used to find the optimal physical model as well as the optimal error model. The optimal model is defined using the evidence, where the average data-fit is balanced by the complexity of the model. The effect of colored noise process is illustrated using a nonlinear aeroelastic oscillator representing a rigid NACA0012 airfoil undergoing limit cycle oscillations due to complex fluid–structure interactions. Several quasi-steady and unsteady aerodynamic models are proposed with colored noise or white noise for the model error. The use of colored noise improves the predictive capabilities of simpler models.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE; Department of National Defense
Grant/Contract Number:
NA0003525
OSTI ID:
1834094
Report Number(s):
SAND--2019-13241J; 680940
Journal Information:
Journal of Sound and Vibration, Journal Name: Journal of Sound and Vibration Vol. 522; ISSN 0022-460X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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