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Article analysis:

The article "Unsteady Theoretical Analysis on the Wake-Induced Vibration of Suspension Bridge Hangers" published in the Journal of Bridge Engineering presents a theoretical study on the possibility of wake-induced vibration of suspension bridge hangers. The authors conducted wind tunnel tests to identify the aerodynamic derivatives of a leeward cylinder and established unsteady theoretical models to investigate the mechanism of wake-induced vibration.

The article provides a comprehensive overview of previous studies on aerodynamic interference among groups of engineering structures, including transmission lines and offshore risers. However, it fails to acknowledge previous research on suspension bridge hangers' vibrations due to wind-induced or other factors. This omission may limit readers' understanding of the context and significance of this study.

The authors present numerical simulations based on the structural parameters of a hanger on the Xihoumen Bridge to study the mechanism of wake-induced vibration. They conclude that obvious oscillations take place in specific spatial regions, and the aerodynamic stiffness force is the key factor in evoking wake-induced vibration. However, they do not provide evidence for their claim that quasi-steady theoretical models could reflect main characteristics as well as unsteady theoretical models.

The article's potential biases include its focus solely on unsteady theoretical models and wind tunnel tests, which may not accurately represent real-world conditions. Additionally, it does not consider other factors that may contribute to suspension bridge hangers' vibrations, such as temperature changes or seismic activity.

Overall, while this article provides valuable insights into wake-induced vibration mechanisms in suspension bridge hangers, it would benefit from acknowledging previous research and considering other factors that may contribute to these vibrations.