Bolt Fatigue Strength for the Tower of Large-scale Horizontal Axis Wind Turbines
Abstract: For achieve the
anti-fatigue strength design of the tower flange’s bolts for the large-scale horizontal
axis wind turbines, the checking method of fatigue strength was proposed based
on theSchmidt-Neuper model. According to the stiffness distribution ratio of
single sector flange system, thenonlinear relationship of internal
force-external tension was established for the bolt. The sequentialstresses of
the bolts were derived through the linear interpolation of load, and the
fatigue cumulative damage distribution of the whole bolt circle was obtained by
using the rain flow counting and accumulated damage calculation. Furthermore
the position of the maximum fatigue cumulative damage can be found. And on this
basis, the effect of some parameters such as retightening force of bolts,
number of bolts and thickness of flange to the maximum fatigue cumulative
damage was analyzed. The results showed that the proposed method and procedure
was feasible and effective in analyzing and checking the fatigue strength of
the tower flange bolts.
Author: Pengwen Sun, Baiwei An,
Kai Long
Journal Code: jptkomputergg160048
