Scruton number

The Scruton number Sc is an important parameter for vortex-induced vibration (excitation) of structures, vibrations caused by rain or wind, dry inclined cable galloping, and wake galloping, the unstable airflow that forms around bridge cables and other cylindrically-structured buildings.^[1] It is named after Christopher "Kit" Scruton, a British industrial dynamics engineer.^[2]^[3]

It is defined by:^[4]

Sc={\frac {2\delta _{s}m_{e}}{\rho b_{\text{ref}}^{2}}},

where

$\delta _{s}$	is the structural damping expressed by the logarithmic damping decrement,
$m_{e}$	is the effective mass per unit length,
$\rho$	is the density of the air, or liquid,
$b_{\text{ref}}$	is the characteristic width of the structure.

References

^ "MECHANICS OF WIND-INDUCED VIBRATIONS". Federal Highway Administration Research and Technology. August 2007. Retrieved 17 January 2017.
^ Wenzel, Helmut (2008). Health Monitoring of Bridges. Wiley. p. 464. ISBN 978-0-470-74018-7.
^ Ted Stathopoulos; Charalambos C. Baniotopoulos (31 December 2007). Wind Effects on Buildings and Design of Wind-Sensitive Structures. Springer Science & Business Media. p. 45. ISBN 978-3-211-73076-8.
^ Hansen, Svend O. (2–7 November 2007). Vortex-induced vibrations of structures (PDF). Structural Engineers World Congress 2007. Bangalore, India. Retrieved 5 March 2021.

[1] "MECHANICS OF WIND-INDUCED VIBRATIONS". Federal Highway Administration Research and Technology. August 2007. Retrieved 17 January 2017.

[2] Wenzel, Helmut (2008). Health Monitoring of Bridges. Wiley. p. 464. ISBN 978-0-470-74018-7.

[StathopoulosBaniotopoulos2007-3] Ted Stathopoulos; Charalambos C. Baniotopoulos (31 December 2007). Wind Effects on Buildings and Design of Wind-Sensitive Structures. Springer Science & Business Media. p. 45. ISBN 978-3-211-73076-8.

[4] Hansen, Svend O. (2–7 November 2007). Vortex-induced vibrations of structures (PDF). Structural Engineers World Congress 2007. Bangalore, India. Retrieved 5 March 2021.

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