Video-based operational modal analysis of slender mechanical structures with neutral axis estimation via barycenter calculation

Recent advances in vibrations, noise, and their use for machine monitoring

Open Access

Fig. 23

Barycenter position amplitude spectrum example where R = 256 grey levels, α = 0.05, σ_b = 3.6 pixel quanta, μ_p = 255 pixel quanta and μ_b = 18.1 pixel quanta. The solid red line corresponds to the value of $σ_{n} / \sqrt{N}$ where σ_n is estimated with equation (33) and the dashed red line corresponds to the associated value of η with a 95% confidence level.

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