A Comparative Study of Wind Tunnel Tests and Design Codes in Evaluation of Along-Wind Effects on Towers

Table 2

Properties of the aeroelastic model (1 : 200 scale).

Parameter		Prototype (Hz)	Model
			Target (Hz)	Measured (Hz)
Natural frequency	1^st	0.242	3.42	3.52
	2^nd	1.648	23.3	24.1
Damping ratio	1^st	1.0%	1.0%	1.08%
	2^nd	1.7%	1.7%	—