부공력감쇠를 고려한 와류하중모델의 진동예측성능
Vibration Estimation Performance of Vortex Wind Load Model with Negative Aerodynamic Damping
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초록
부공력감쇠는 풍직각방향의 와류공진을 예측하는데 있어서 매우 중요한 요소이다 . 부공력감쇠는 진동유발하중 또는 피드백 하중을 구성하는 주요인자로 와류진동이 급격히 발현되는 현상을 설명하는 도구이기도 하다 . 본 연구에서는 공력감쇠의 수학적 모델 을 제시하고 와류유발하중모델과 함께 와류진동을 예측하는 프러세스를 제안한다 . 직사각형단면에 대한 공기력진동실험을 수행하여 , 계측된 가속도로부터 공력감쇠와 와류유발하중을 추정하고 이에 기반하여 공력감쇠모델과 와류유발하중모델을 구축하는 과정을 다룬 다. 최종적으로 공력감쇠모델과 와류유발하중 모델에 대한 재해석을 통하여 가속도응답을 구하고 계측된 가속도와 비교하여 모델의 진동예측성능을 평가한다 . 본 연구에서 제안된 와류하중모델의 진동예측성능을 평가한 결과 안정적이며 , 신뢰도가 높은 와류진동예측 이 가능함을 알 수 있었다 .
Abstract
The negative aerodynamic damping is a very crucial parameter in estimating the vortex induced resonance(VIR) in the across-wind direction. Aerodynamic damping is a major factor constituting so-called motion induced load or feedback load, and it is also a tool to explain the rapid manifestation of VIR. In this study, a mathematical model of aerodynamic damping are evaluated, and a process for predicting vortex induced vibration(VIV) along with vortex induced load model is proposed. By performing aeroelastic model test of a slender structure with a rectangular section, the aerodynamic damping and vortex-induced load are identified from the measured acceleration, based on these results, the mathematical models for aerodynamic damping and vortex induced load with respect to the wind speed were constructed. Finally, vibration estimation performance was evaluated by comparing the measured acceleration with the acceleration response obtained through re-analysis using the aerodynamic damping model and the vortex induced load model. From the numerical results, it was found that mathematical model of across wind load model are able to reliably predict VIV with a high reliability.
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