Wind-induced disaster

[19] Tornadoes occurred in the outer rainband of Typhoon 1408

○Soichiro Yuasa¹, Koji Sassa² (1.Graduate school of Integrated Arts and Sciences, Kochi University, 2.Science Department, Natural Science Cluster, Kochi University)

Keywords:Tornado, Typhoon, Outer rainband, Polarimetric radar

In this study, dynamic load calculation was carried out to estimate the maximum load during power production. Based on the results, an empirical formula for the estimation of maximum load during power production was proposed. Proposed formula for the estimation of moment on the rotor shows good agreement with simulations. A model to estimate maximum tower moment was proposed by combining conventional model for tower moment induced by thrust force and proposed model of rotator moment and proposed model shows good agreement with the simulation. A new convergence criterion for load extrapolation was proposed. By applying the proposed criteria, the coefficient of variation of the estimated design load was reduced from 8.9% to 5.6%. An universal extrapolation coefficient was proposed by subtracting the mean value from both design load and mean of the maximum load and it was shown the proposed coefficient can be applied to any height of the tower.