A Damage Prognosis Method of Girder Structures Based on Wavelet Neural Networks

Table 3

The test samples.

𝑁	Inputs of section stiffness (×10^−6 m^4)			Outputs of fundamental frequency (Hz)
1	2.23	0.105	2.23	22.018
2	0.105	0.105	2.23	19.455
3	0.105	0.105	0.105	17.288

Note: “𝑁” is the number of the samples.