This study addresses modeling of aerodynamic damping for a two-dimensional (2-D) suspended circular cylinder in uniform flow, and aims to provide an appropriate model for predicting vortex-induced vibration (VIV) of a circular cylinder. Full-scale and wind-tunnel tests have revealed that the crosswind response of a circular cylinder such as a steel chimney calculated by aerodynamic damping models recommended in several international codes is dramatically overestimated for most cylinders with Scruton numbers less than 15, so these models are re-studied and discussed. This paper proposes an improved aerodynamic damping model that shows good agreement with experimental results. The proposed model is further verified by estimating the transverse displacement responses of suspended circular cylinders tested in uniform flow and the predicted results are promising. The proposed model provides a theoretical basis that can be used to develop an aerodynamic damping model for bridge decks as well as other structures.

这项研究解决了二维（2-D）悬浮圆柱在均匀流动中的空气动力学阻尼建模问题，旨在为预测圆柱的涡激振动（VIV）提供合适的模型。全面测试和风洞测试表明，对于大多数Scruton数小于15的气缸，通过多个国际法规中推荐的空气动力学阻尼模型计算得出的圆柱体（如钢烟囱）的侧风响应被大大高估了，因此这些模型是重新研究和讨论。本文提出了一种改进的空气动力学阻尼模型，该模型与实验结果吻合良好。通过估计均匀流动下测试的悬浮圆柱的横向位移响应，可以进一步验证所提出的模型，并且预测结果是有希望的。提出的模型提供了理论基础，可用于开发桥面以及其他结构的空气动力学阻尼模型。