BEAR-325 conductor's self-damping curves.

Contexts in source publication

Context 1

... conductor's power-dissipated curves are plotted over the relative amplitude of vibration as a result of the use of the Power Method, and they are contrasted with the power supplied to the system by the wind. Figure 6 presents these curves regarding the three resonance frequencies. ...

Context 2

... estimated damping ratio can be calculated using equation (10), which relates the energy dissipated by the conductor Ediss and the maximum kinetic energy Emax the conductor can absorb (equation 11 In equation (11), m is the conductor mass per unit length, ω is the circular frequency, and Y is the bending amplitude of vibration. Considering the intermediate self-damping curve from Figure 6, which corresponds to the frequency of 20,3 Hz, the estimated damping ratio for a relative amplitude (Y/D) that conducts to failure due to fatigue is ξc = 0.00168%. On the other hand, the minimum damping ratio required by inputted wind power can be calculated using the Scruton number defined by equation (12) and equation (13), resulting in a minimum damping of ξmin = 0.0404%. ...