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实际应用中,桥梁涡振稳定性可用风洞试验的结果作为评估标准,但涡振时断面的压力空间分布特征是不清楚的.对弹性悬挂的刚体模型在涡振时及固定时(来流风速与涡振风速一致)的表面压力进行采样,分析模型在涡振时和固定时的表面各部分压力特性,结果显示,表面压力波动主要集中在下游部分.随后运用本征正交分解(POD)方法分析模型表面压力分布特征与涡振之间的关系,结果显示,所获得的本征模态中存在与涡振关联极强的‘主导模态’,该模态对总升力系数波动的贡献占绝对主导地位.其余模态所含能量较少,且与涡振的关联性很小.本文的工作为涡振机理的研究提供了新的思路和方法.
In practice, the results of wind tunnel test can be used as the evaluation criteria for the stability of the vortex-induced vibration of the bridge, but the pressure distribution in the vortex-induced vibration is not clear.For the rigid-body model with elastic suspension, The wind speed and vortex-induced wind speed are sampled, and the pressure characteristics of each part on the surface of the model are analyzed. The results show that the surface pressure fluctuation mainly concentrates in the downstream part. Then, by means of the intrinsic orthogonal decomposition (POD) ) Method was used to analyze the relationship between the surface pressure distribution and the vortex-induced vibration. The results show that there exists a dominant mode with strong correlation with the vorticity in the eigenmode. The mode has a great influence on the fluctuation of the total lift coefficient Contribution to the absolute dominance of the rest of the modal contains less energy and vorticity is very small.The work in this paper provides a new way of thinking for the study of vortex vibration mechanism.