Worst-Case Gust-Response Analysis for Typical Airfoil Section with Control Surface

2005 ◽  
Vol 42 (4) ◽  
pp. 956-962 ◽  
Author(s):  
Atsushi Kanda ◽  
Earl H. Dowell
Keyword(s):  
Control Surface ◽  
Response Analysis ◽  
Worst Case ◽  
Airfoil Section ◽  
Gust Response

Nonlinear response of airfoil section with control surface freeplay to gust loads

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1543-1557 ◽  
Author(s):  
Deman Tang ◽  
Denis Kholodar ◽  
Earl H. Dowell
Keyword(s):  
Nonlinear Response ◽  
Control Surface ◽  
Airfoil Section ◽  
Gust Loads

Vibration behavior of an overhead conductor under updraft winds

2021 ◽  
pp. 107754632110058
Author(s):  
Qi Zhou ◽  
Liangtao Zhao ◽  
Chong Zheng ◽  
Feng Tu
Keyword(s):  
Induced Response ◽  
Response Analysis ◽  
Response Factor ◽  
Structural Dynamic ◽  
Resonance Response ◽  
Structural Dynamic Characteristics ◽  
Strong Winds ◽  
American Society ◽  
Gust Response Factor ◽  
Gust Response

At present, the wind-induced response analysis of an overhead conductor is mainly based on the action of horizontal normal wind. However, for crossing hillsides or extremely strong winds, such a conductor will bear the action of updraft wind, which will change the geometry of the conductor and make its structural dynamic characteristics nonlinear to some extent. In this work, the in-plane and out-of-plane two-dimensional nonlinear equations were established under the action of self-weight and updraft wind. Furthermore, the improved equations of conductor tension and sag were obtained, and the wind-induced vibration response was further investigated. The results showed that the updraft wind caused the nonlinearity of the tension and sag of the overhead conductor, and the nonlinear geometric change significantly affected its resonance response, which exceeded 25% if the wind speed was 50 m/s. In addition, because the proportion of the resonance response in the total wind-induced response was different, the influence of the wind attack angle calculated using the gust response factor method on the gust response factor was slightly larger than that calculated using the the American society of civil engineers method.

Robust Flutter Analysis of an Airfoil with Flap Freeplay Uncertainty

2008 ◽  
Vol 33-37 ◽  
pp. 1247-1252 ◽  
Author(s):  
Zhi Chun Yang ◽  
Ying Song Gu
Keyword(s):  
Control Surface ◽  
Two Dimensional ◽  
Advanced Technique ◽  
Worst Case ◽  
Wing Model ◽  
Freeplay Nonlinearity ◽  
Flutter Analysis ◽  
Flutter Boundary ◽  
Nominal Parameter ◽  
Flutter Margin

Modern robust flutter method is an advanced technique for flutter margin estimation. It always gives the worst-case flutter speed with respect to potential modeling errors. Most literatures are focused on linear parameter uncertainty in mass, stiffness and damping parameters, etc. But the uncertainties of some structural nonlinear parameters, the freeplay in control surface for example, have not been taken into account. A robust flutter analysis approach in μ-framework with uncertain nonlinear operator is proposed in this study. Using describing function method the equivalent stiffness formulation is derived for a two dimensional wing model with freeplay nonlinearity in its flap rotating stiffness. The robust flutter margin is calculated for the two dimensional wing with flap freeplay uncertainty and the results are compared with that obtained with nominal parameter values. It is found that by considering the perturbation of freeplay parameter more conservative flutter boundary can be obtained, and the proposed method in μ-framework can be applied in flutter analysis with other types of concentrated nonlinearities.

scholarly journals Gust Response Analysis of a Turbine Cascade

2003 ◽  
Vol 20 (2) ◽  
Author(s):  
Rama Subba Reddy Gorla ◽  
Tondapu Seetharama Reddy ◽  
Dhanireddy Ramalinga Reddy ◽  
Anatole P. Kurkov
Keyword(s):  
Response Analysis ◽  
Turbine Cascade ◽  
Gust Response

Kriging-Based Aeroelastic Gust Response Analysis at High Angles of Attack

AIAA Journal ◽  
2020 ◽  
Vol 58 (9) ◽  
pp. 3777-3787 ◽  
Author(s):  
Wrik Mallik ◽  
Daniella E. Raveh
Keyword(s):  
Response Analysis ◽  
High Angles Of Attack ◽  
Gust Response

Gust Response Computations with Control Surface Freeplay Using Random Input Describing Functions

AIAA Journal ◽  
2020 ◽  
Vol 58 (7) ◽  
pp. 2899-2908 ◽  
Author(s):  
Madhusudan A. Padmanabhan ◽  
Earl H. Dowell
Keyword(s):  
Control Surface ◽  
Random Input ◽  
Describing Functions ◽  
Gust Response
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