Author: Vladislav Klein
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 46
Book Description
Estimation of Aircraft Nonlinear Unsteady Parameters From Wind Tunnel Data
Author: Vladislav Klein
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 46
Book Description
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 46
Book Description
Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data
Modeling of Aircraft Unsteady Aerodynamic Characteristics/Part 3 - Parameters Estimated from Flight Data
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548
Book Description
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 176
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 176
Book Description
Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16XL Aircraft
Author:
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 70
Book Description
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 70
Book Description
AIAA Aerospace Sciences Meeting and Exhibit, 42nd
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 590
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 590
Book Description
NASA Scientific and Technical Publications
Select Means for Determining Unsteady Aerodynamic Response Characteristics from Static Data
Author: Gregory A. Addington
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 38
Book Description
Recent analysis has shown that nearly every high-performance tactical aircraft in the inventory of American and allied air forces has experienced some sort of unexpected controlled-flight departure in the early stages of flight testing. Most, if not all, of these in-flight departures had characteristics which lead to the conclusion that they were the result of critical state encounters. Critical states are discrete flight mechanical state vector values where the aerodynamic response loses its analytic dependence on one or more of the variables in that state vector. Critical states manifest themselves as discontinuities in either magnitude or slope in static force and moment data, and as dynamic responses which may be nonlinear with respect to either geometric parameters and/or time. This report presents two analysis procedures which have shown promise in the detection of critical states. First, spectral analysis of data ensembles acquired during wind tunnel tests of two 65 degree delta wings has shown that changes in these spectra signal the presence of some critical states. Further, the nature of these spectra have in some instances provided insight into the nature of the dynamic response. The second analysis procedure involves comparing the static experimental data to a simple potential-flow-based numerical model. It was found that when the experimental dataset diverged from the numerical simulation, critical states were present. Both of these analysis procedures required no additional data to be acquired and minimal analytical effort. Therefore, they provide a cost-effective means for adverting the effects of critical states during early air vehicle test-and-evaluation programs.
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 38
Book Description
Recent analysis has shown that nearly every high-performance tactical aircraft in the inventory of American and allied air forces has experienced some sort of unexpected controlled-flight departure in the early stages of flight testing. Most, if not all, of these in-flight departures had characteristics which lead to the conclusion that they were the result of critical state encounters. Critical states are discrete flight mechanical state vector values where the aerodynamic response loses its analytic dependence on one or more of the variables in that state vector. Critical states manifest themselves as discontinuities in either magnitude or slope in static force and moment data, and as dynamic responses which may be nonlinear with respect to either geometric parameters and/or time. This report presents two analysis procedures which have shown promise in the detection of critical states. First, spectral analysis of data ensembles acquired during wind tunnel tests of two 65 degree delta wings has shown that changes in these spectra signal the presence of some critical states. Further, the nature of these spectra have in some instances provided insight into the nature of the dynamic response. The second analysis procedure involves comparing the static experimental data to a simple potential-flow-based numerical model. It was found that when the experimental dataset diverged from the numerical simulation, critical states were present. Both of these analysis procedures required no additional data to be acquired and minimal analytical effort. Therefore, they provide a cost-effective means for adverting the effects of critical states during early air vehicle test-and-evaluation programs.
Analysis of Wind Tunnel Oscillatory Data of the X-31A Aircraft
Author: Mark S. Smith
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 130
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 130
Book Description