First-Order Unsteady Aerodynamic Model that Includes the Static Hysteresis Phenomenon

2002 ◽  
Author(s):  
Pedro de Oliveira ◽  
Frederick Lutze
Keyword(s):  
Hysteresis Phenomenon ◽  
First Order ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model

A Time-Domain Fluid-Structure Interaction Analysis of Fan Blades

2008 ◽  
Author(s):  
Seung Ho Cho ◽  
Taehyoun Kim ◽  
Seung Jin Song
Keyword(s):  
Time Domain ◽  
Vortex Lattice ◽  
Interaction Analysis ◽  
Three Dimensional ◽  
Incoming Flow ◽  
Structure Interaction ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model ◽  
Blade Row ◽  
Fan Blade

This paper presents aerodynamic and aeromechanical analyses for an entire row of fan blades (i.e. tens of blades with a finite aspect ratio) subject to a uniform incoming flow. In this regard, a new unsteady three-dimensional vortex lattice model has been developed for multiple blades in discrete time domain. Using the new model, the characteristics of the unsteady aerodynamic forces on vibrating blades, including their temporal development, are examined. Also, the new aerodynamic model is applied to examine the aeromechanical behavior of fan blades by using a standard eigenvalue analysis. For this analysis, the fan blades have been modeled as three-dimensional plates, and, increasing the number of blades (or solidity) is predicted to destabilize the fan blade row.

scholarly journals Study on the High-Speed and Close of the UVA Cooperative Formation Controller Design

2018 ◽  
Vol 36 (2) ◽  
pp. 345-352
Author(s):  
Jialong Zhang ◽  
Jianguo Yan ◽  
Pu Zhang ◽  
Xiaoqiao Qi ◽  
Maolong Lü
Keyword(s):  
Dynamic Characteristic ◽  
High Speed ◽  
Controller Design ◽  
Design Method ◽  
Formation Flight ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model ◽  
Thrust Vector ◽  
The Stability ◽  
Rudder Angle

Aiming at the high-speed flight of the UAVs cooperative formation, when a single UAV has occurred, need to exit the formation flight and be close or super close to form of the formation quickly. A fast close cooperative formation controller design method is proposed to make up for low the fighting robustness, and be shortcomings of timeliness poorly and analyze the dynamic characteristic of UAV formation flight. Taking the external factors known into consideration, setting up for the longitude maneuver of nonlinear thrust vector and unsteady aerodynamic model, according to the formation velocity, flat tail rudder angle and thrust vector and pitch angle velocity for corresponding input commend signals for the controller to research the dynamic characteristic of UAV formation flight. Meanwhile, the formation flight distance error is the convergence to a fixed value, and the stability of the cooperative formation flight is good. The simulation of results show that the controller can effectively improve the speed of the close or super close to formation, and maintain the stability of the formation flight, which provides a method of the close or super close formation flight controller design.

scholarly journals A DNN surrogate unsteady aerodynamic model for wind turbine loads calculations

2020 ◽  
Vol 1618 ◽  
pp. 052060
Author(s):  
Shreyas Ananthan ◽  
Ganesh Vijayakumar ◽  
Shashank Yellapantula
Keyword(s):  
Wind Turbine ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model

scholarly journals Unsteady aerodynamic model of flexible flapping wing

2018 ◽  
Vol 80 ◽  
pp. 354-367 ◽  
Author(s):  
Si Chen ◽  
Hao Li ◽  
Shijun Guo ◽  
Mingbo Tong ◽  
Bing Ji
Keyword(s):  
Flapping Wing ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model

Unsteady Aerodynamic Model Based on the Leading-Edge Stagnation Point

2016 ◽  
Vol 53 (6) ◽  
pp. 1626-1637 ◽  
Author(s):  
Vishvas S. Suryakumar ◽  
Yogesh Babbar ◽  
Thomas W. Strganac ◽  
Arun S. Mangalam
Keyword(s):  
Stagnation Point ◽  
Leading Edge ◽  
Unsteady Aerodynamic ◽  
Model Based ◽  
Aerodynamic Model

scholarly journals Reduced order unsteady aerodynamic model of a rigid aerofoil in gust encounters

2017 ◽  
Vol 63 ◽  
pp. 203-213 ◽  
Author(s):  
Qiang Zhou ◽  
Gang Chen ◽  
Andrea Da Ronch ◽  
Yueming Li
Keyword(s):  
Reduced Order ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model

An Unsteady Aerodynamic Model based on the Leading-Edge Stagnation Point

2015 ◽  
Author(s):  
Vishvas S. Suryakumar ◽  
Yogesh Babbar ◽  
Thomas W. Strganac ◽  
Arun S. Mangalam
Keyword(s):  
Stagnation Point ◽  
Leading Edge ◽  
Unsteady Aerodynamic ◽  
Model Based ◽  
Aerodynamic Model
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