Frequency Domain Fatigue
Frequency Domain Fatigue
Frequency Domain Fatigue
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<strong>Frequency</strong> domain wind stressInputspectral density [(m/s) 2 s]Improved Von Karman time simulation10 2Improved Von Karman theoretical10 110 010 -110 -2Wind10 3 <strong>Frequency</strong> [Hz]TRF top force10 -30 0.5 1 1.5 2TRF stressTRFResponse spectrum tower top load[N 2 *s]10 11 <strong>Frequency</strong> [Hz]10 1010 910 810 710 610 5TRF tower top load tomudline bending stress [(N/m 2 )/N]7000600050004000300020001000TRF without aerodynamic dampingTRF with aerodynamic damping10 400 0.5 1 1.5 20 0.5 1 1.5 2 2.5 3 3.5 4<strong>Frequency</strong> [Hz]Stress responseOutputResponse spectrummudline bending stress [(N/m 2 ) 2 *s)]2.521.510.53 x 1012 <strong>Frequency</strong> [Hz]Time domain simulationincluding aerodynamic damping<strong>Frequency</strong> domain calculationincluding aerodynamic damping00 0.5 1 1.5 2
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