Reduced-Order Aeroservoelastic Model with an Unsteady Aerodynamic Eigen Formulation

AIAA Journal ◽  
10.2514/2.201 ◽  
1997 ◽  
Vol 35 (6) ◽  
pp. 1087-1088 ◽  
Author(s):  
Taehyoun Kim ◽  
Changho Nam ◽  
Youdan Kim
Keyword(s):  
Reduced Order ◽  
Unsteady Aerodynamic

A Reduced Order Model of Unsteady Flows in Turbomachinery

1994 ◽  
Author(s):  
Kenneth C. Hall ◽  
Răzvan Florea ◽  
Paul J. Lanzkron
Keyword(s):  
Fluid Motion ◽  
Unsteady Flows ◽  
Reduced Order Model ◽  
Lanczos Algorithm ◽  
Order Model ◽  
Reduced Order ◽  
Unsteady Aerodynamic ◽  
Natural Modes ◽  
Wide Range ◽  
Modes Of Vibration

A novel technique for computing unsteady flows about turbomachinery cascades is presented. Starting with a frequency domain CFD description of unsteady aerodynamic flows, we form a large, sparse, generalized, non-Hermitian eigenvalue problem which describes the natural modes and frequencies of fluid motion about the cascade. We compute the dominant left and right eigenmodes and corresponding eigenfrequencies using a Lanczos algorithm. Then, using just a few of the resulting eigenmodes, we construct a reduced order model of the unsteady flow field. With this model, one can rapidly and accurately predict the unsteady aerodynamic loads acting on the cascade over a wide range of reduced frequencies and arbitrary modes of vibration. Moreover, the eigenmode information provides insights into the physics of unsteady flows. Finally we note that the form of the reduced order model is well suited for use in active control of aeroelastic and aeroacoustic phenomena.

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

Prediction of Turbomachinery Aeroelastic Behavior From a Set of Representative Modes

2011 ◽  
Author(s):  
Mari´a A. Mayorca ◽  
Damian M. Vogt ◽  
Hans Ma˚rtensson ◽  
Torsten H. Fransson
Keyword(s):  
Wide Frequency Range ◽  
Least Square ◽  
Mode Shapes ◽  
Frequency Range ◽  
Reduced Order ◽  
Transonic Compressor ◽  
Unsteady Aerodynamic ◽  
Shape Perturbation ◽  
Selection Of

A method is proposed for the determination of the aeroelastic behavior of a system responding to mode-shapes different to the tuned in-vacuo ones, due to mistuning, mode family interaction or any other source of mode-shape perturbation. The method is based on the generation of a data base of unsteady aerodynamic forces arising from the motion of arbitrary modes and uses Least Square approximations for the prediction of any responding mode. The use of a reduced order technique allows for mistuning analyses and is also applied for the selection of a limited number of arbitrary modes. The application on a transonic compressor blade shows that the method captures well the aeroelastic properties in a wide frequency range. A discussion of the influence of the mode-shapes and frequency on the final stability response is also provided.

Reduced Order Models in Unsteady Aerodynamic Models, Aeroelasticity and Molecular Dynamics

2006 ◽  
pp. 15-15
Author(s):  
Earl H. Dowell ◽  
Kenneth C. Hall ◽  
Jeffrey P. Thomas ◽  
Robert E. Kielb ◽  
Meredith A. Spiker ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Reduced Order Models ◽  
Reduced Order ◽  
Unsteady Aerodynamic
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