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Abstract
In aerodynamics, as in many engineering applications, a parametrised mathematical model is used for design and control. Often, such models are directly estimated from experimental data. However, in some cases, it is better to first identify a socalled nonparametric model, before moving to a parametric model. Especially when nonlinear effects are present, a lot of information can be gained from the nonparametric model and the resulting parametric model will be better. In this article, we estimate a nonparametric model of the lift force acting on a pitching wing, using experimental data. The experiments are done using the Active Aeroelastic Test Bench (AATB) setup, which is capable of imposing a wide variety of motions to a wing. The input is the angle of attack and the output is the lift force acting on the NACA 0018 wing. The model is estimated for two different types of input signal, swept sine and oddrandom multisine signals. The experiments are done at two different pitch offset angles (5° and 20°) with a pitch amplitude of 6°, covering both the linear and nonlinear aerodynamic flow regime. In the case of oddrandom multisines nonlinearity on the FRF is also estimated. We show that the level and characterisation of the nonlinearity in the output can be resolved through a nonparametric model, and that it serves as a necessary step in estimating parametric models.
Original language  English 

Publication status  Published  2020 
Event  TORQUE 2020: The Science of Making Torque from Wind  TU Delft (online), Delft , Netherlands Duration: 28 Sep 2020 → 2 Oct 2020 https://www.torque2020.org 
Conference
Conference  TORQUE 2020 

Country/Territory  Netherlands 
City  Delft 
Period  28/09/20 → 2/10/20 
Internet address 
Keywords
 Nonparametric model
 Datadriven
 Best linear approximation (BLA)
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 1 Finished

SRP60: SRPGroeifinanciering: A system identification framework for multifidelity modelling
De Troyer, T., Runacres, M., Blondeau, J., Bram, S., Bellemans, A. & Contino, F.
1/03/19 → 29/02/24
Project: Fundamental