Author: Lars E. Ericsson
Publisher:
ISBN:
Category :
Languages : en
Pages : 237
Book Description
The steady and unsteady vortex-induced asymmetric loads on slender vehicles were investigated. The study reviewed pertinent two- and three-dimensional data; developed analytic means for predicting the upper limit for vortex-induced asymmetric loads; and assessed the importance of these loads to the vehicle dynamics of slender bodies of revolution. The study showed boundary layer transition to have a dominant influence on static and dynamic vortex-induced loads. The predicted upper limit for vortex-induced asymmetric loads bounds all available experimental data from subcritical to supercritical Reynolds numbers. The most powerful dynamic effect is that of the moving wall at the separation point, which has a wall-jet-like effect on the boundary layer separation and transition. Preliminary experimental results indicate that because of this effect the dynamic stability parameters due to pitching and coning can be one order of magnitude larger than those occurring in attached flow at lower angles-of-attack. A very important effect of asymmetric vortices existing at high angles-of-attack is to provide a coupling mechanism at zero sideslip between longitudinal and lateral degrees of freedom. As these cross coupling effects are very large, highly nonlinear, often discontinuous and associated with hysteresis effects, with especially large impact on the vehicle dynamics, they are of great concern to missile and aircraft designers.
Vortex-Induced Asymmetric Loads on Slender Vehicles
Author: Lars E. Ericsson
Publisher:
ISBN:
Category :
Languages : en
Pages : 237
Book Description
The steady and unsteady vortex-induced asymmetric loads on slender vehicles were investigated. The study reviewed pertinent two- and three-dimensional data; developed analytic means for predicting the upper limit for vortex-induced asymmetric loads; and assessed the importance of these loads to the vehicle dynamics of slender bodies of revolution. The study showed boundary layer transition to have a dominant influence on static and dynamic vortex-induced loads. The predicted upper limit for vortex-induced asymmetric loads bounds all available experimental data from subcritical to supercritical Reynolds numbers. The most powerful dynamic effect is that of the moving wall at the separation point, which has a wall-jet-like effect on the boundary layer separation and transition. Preliminary experimental results indicate that because of this effect the dynamic stability parameters due to pitching and coning can be one order of magnitude larger than those occurring in attached flow at lower angles-of-attack. A very important effect of asymmetric vortices existing at high angles-of-attack is to provide a coupling mechanism at zero sideslip between longitudinal and lateral degrees of freedom. As these cross coupling effects are very large, highly nonlinear, often discontinuous and associated with hysteresis effects, with especially large impact on the vehicle dynamics, they are of great concern to missile and aircraft designers.
Publisher:
ISBN:
Category :
Languages : en
Pages : 237
Book Description
The steady and unsteady vortex-induced asymmetric loads on slender vehicles were investigated. The study reviewed pertinent two- and three-dimensional data; developed analytic means for predicting the upper limit for vortex-induced asymmetric loads; and assessed the importance of these loads to the vehicle dynamics of slender bodies of revolution. The study showed boundary layer transition to have a dominant influence on static and dynamic vortex-induced loads. The predicted upper limit for vortex-induced asymmetric loads bounds all available experimental data from subcritical to supercritical Reynolds numbers. The most powerful dynamic effect is that of the moving wall at the separation point, which has a wall-jet-like effect on the boundary layer separation and transition. Preliminary experimental results indicate that because of this effect the dynamic stability parameters due to pitching and coning can be one order of magnitude larger than those occurring in attached flow at lower angles-of-attack. A very important effect of asymmetric vortices existing at high angles-of-attack is to provide a coupling mechanism at zero sideslip between longitudinal and lateral degrees of freedom. As these cross coupling effects are very large, highly nonlinear, often discontinuous and associated with hysteresis effects, with especially large impact on the vehicle dynamics, they are of great concern to missile and aircraft designers.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
Book Description
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 24
Book Description
AIAA 86-0452 - AIAA 86-0499
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 434
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 434
Book Description
Wave Forces on Offshore Structures
Author: Turgut 'Sarp' Sarpkaya
Publisher: Cambridge University Press
ISBN: 1139487590
Category : Technology & Engineering
Languages : en
Pages : 337
Book Description
A thorough understanding of the interaction of waves and currents with offshore structures has now become a vital factor in the safe and economical design of various offshore technologies. There has been a significant increase in the research efforts to meet this need. Although considerable progress has been made in the offshore industry and in the understanding of the interaction of waves, currents, and wind with ocean structures, most of the available books concentrate only on practical applications without a grounding in the physics. This text integrates an understanding of the physics of ocean-structure interactions with numerous applications. This more complete understanding will allow the engineer and designer to solve problems heretofore not encountered, and to design new and innovative structures. The intent of this book is to serve the needs of future generations of engineers designing more sophisticated structures at ever increasing depths.
Publisher: Cambridge University Press
ISBN: 1139487590
Category : Technology & Engineering
Languages : en
Pages : 337
Book Description
A thorough understanding of the interaction of waves and currents with offshore structures has now become a vital factor in the safe and economical design of various offshore technologies. There has been a significant increase in the research efforts to meet this need. Although considerable progress has been made in the offshore industry and in the understanding of the interaction of waves, currents, and wind with ocean structures, most of the available books concentrate only on practical applications without a grounding in the physics. This text integrates an understanding of the physics of ocean-structure interactions with numerous applications. This more complete understanding will allow the engineer and designer to solve problems heretofore not encountered, and to design new and innovative structures. The intent of this book is to serve the needs of future generations of engineers designing more sophisticated structures at ever increasing depths.
Vortex-Induced Asymmetric Loads in 2-D and 3-D Flows
Author: L. E. Ericsson
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
Book Description
AIAA 84-0351 - 84-0400
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 528
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 528
Book Description
Applied Mechanics Reviews
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 990
Book Description
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 990
Book Description
30th Aerospace Sciences Meeting and Exhibit: 92-0411 - 92-0439
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 524
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 524
Book Description
A Collection of Technical Papers
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 564
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 564
Book Description