선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- A new configuration is designed that improves the static stiffness and the aerodynamic damping over those in the initial MFP. The new MFP has better accuracy in measuring the pressure and angle of attack.
- The direction of the design modification is determined by estimating how much improvement in aerodynamic damping can be achieved by adding a surface to the initial MFP. The additional surface has an area of A2 and a center of pressure at a distance D2 from the rotation axis.
- The results from the CFD analysis are compared with results from the wind tunnel test for the new MFP designs. The aerodynamic stiffness is measured in the test by recording the displacement angle corresponding to the moment applied to the model. The moment is adjusted by adding mass to the test rig.
- In this study, modified MFPs were designed and tested. It was verified by analysis and testing that they have better aerodynamic performance than the initial MFP.
이론/모형
- In order to obtain the aerodynamic stiffness, a NavierStokes equation solver was used for the analysis along with the Spalart-Allmaras turbulence model. The grid is generated to have 15 viscous boundary layers on the surface, where y+ is less than 10.
- . In this study, however, it is calculated using a CFD tool. The damping coefficient can be calculated based on two motions: pitch oscillation and ramp motion8.
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