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| Characteristics of flutter self-excited forces for typical blunt body under large attack angles |
| Liu Mu-guang1, Chen Zheng-qing2 |
| 1. School of Civil Engineering and Transportation, State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China. 2. Wind Engineering Research Center, Hunan University, Changsha 410082, China |
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Abstract Based on three degrees of freedom forced vibration device, the actual bending vibration modes at large attack angles for real structure were simulation, and the influence of vertical vibration on the aerodynamic derivatives H1*、H4*、A1*、A4*, was further investigated through a series of wind tunnel tests with rectangle and H-section. The results show that vertical vibration modes have obvious effect on aerodynamic derivatives H1*、H4*、A1*, and the influence degree is relevant with wind attack angle and cross section. However, the variation of aerodynamic derivatives versus the non-dimensional wind speed do not affect by vibration modes. Contrastive analysis shows that it is necessary to identify the flutter derivatives with vertical bending vibration mode consistent with the actual structure under large attack angles.
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Received: 24 July 2012
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2013, Vol. 32 
