A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Nonlinear modelling of aerodynamic self-excited forces: An experimental study
https://orcid.org/0000-0002-1650-740X
https://orcid.org/0000-0003-0971-3659
Abstract The bridge aerodynamics research community is currently discussing several nonlinear wind load models for bridge decks, but no definite conclusion on which model is superior to the others is currently available. In this paper, we use experimental data for a double-deck section model tested in an advanced forced vibration rig to study the observed nonlinearities and to gain insight into what characteristics the nonlinear load model should be capable of modelling. Single harmonic horizontal, vertical and pitching motion; combined motion; and stochastic motion are considered. This approach allows the investigation of a more extensive range of nonlinear behaviours than regular wind tunnel testing. The typical nonlinear characteristics observed are mean drift, deviation from superposition and harmonic distortion. Further, we introduce a simple response-surface model for force prediction using polynomial combinations of the inputs and its derivatives. The model helps to gain further insight into the nonlinearity of the problem at hand and to select which refined modelling approach can be used in future work.
Highlights An in-depth view of nonlinear features on twin-deck experimental self-excited force data tested in a forced vibration rig. Stochastic one and two degree of freedom motion is evaluated. A nonlinear response surface model has been considered to highlight the nonlinear features.
Nonlinear modelling of aerodynamic self-excited forces: An experimental study
https://orcid.org/0000-0002-1650-740X
https://orcid.org/0000-0003-0971-3659
Abstract The bridge aerodynamics research community is currently discussing several nonlinear wind load models for bridge decks, but no definite conclusion on which model is superior to the others is currently available. In this paper, we use experimental data for a double-deck section model tested in an advanced forced vibration rig to study the observed nonlinearities and to gain insight into what characteristics the nonlinear load model should be capable of modelling. Single harmonic horizontal, vertical and pitching motion; combined motion; and stochastic motion are considered. This approach allows the investigation of a more extensive range of nonlinear behaviours than regular wind tunnel testing. The typical nonlinear characteristics observed are mean drift, deviation from superposition and harmonic distortion. Further, we introduce a simple response-surface model for force prediction using polynomial combinations of the inputs and its derivatives. The model helps to gain further insight into the nonlinearity of the problem at hand and to select which refined modelling approach can be used in future work.
Highlights An in-depth view of nonlinear features on twin-deck experimental self-excited force data tested in a forced vibration rig. Stochastic one and two degree of freedom motion is evaluated. A nonlinear response surface model has been considered to highlight the nonlinear features.
Nonlinear modelling of aerodynamic self-excited forces: An experimental study
https://orcid.org/0000-0002-1650-740X
https://orcid.org/0000-0003-0971-3659
Abstract The bridge aerodynamics research community is currently discussing several nonlinear wind load models for bridge decks, but no definite conclusion on which model is superior to the others is currently available. In this paper, we use experimental data for a double-deck section model tested in an advanced forced vibration rig to study the observed nonlinearities and to gain insight into what characteristics the nonlinear load model should be capable of modelling. Single harmonic horizontal, vertical and pitching motion; combined motion; and stochastic motion are considered. This approach allows the investigation of a more extensive range of nonlinear behaviours than regular wind tunnel testing. The typical nonlinear characteristics observed are mean drift, deviation from superposition and harmonic distortion. Further, we introduce a simple response-surface model for force prediction using polynomial combinations of the inputs and its derivatives. The model helps to gain further insight into the nonlinearity of the problem at hand and to select which refined modelling approach can be used in future work.
Highlights An in-depth view of nonlinear features on twin-deck experimental self-excited force data tested in a forced vibration rig. Stochastic one and two degree of freedom motion is evaluated. A nonlinear response surface model has been considered to highlight the nonlinear features.
Nonlinear modelling of aerodynamic self-excited forces: An experimental study
Skyvulstad, Henrik (author) / Argentini, Tommaso (author) / Zasso, Alberto (author) / Øiseth, Ole (author)
2020-12-14
Article (Journal)
Electronic Resource
English
Problem of natural vibration, wind-excited forces, and aerodynamic stability of suspended roofs
| Engineering Index Backfile | 1966
Experimental study and mathematical modelling of biofilter aerodynamic resistance
| DOAJ | 2004