1 Introduction
2 Methodology
2.1 Decoupled approach
2.2 Load cases
Harmonic number | Load case | ||
---|---|---|---|
\(\text{LC}_{0}\) | \(\text{LC}_{1}\) | \(\text{LC}_{2}\) | |
6th harmonic [Nm] | 0 | 803.5 | 115.9 |
12th harmonic [Nm] | 0 | 685.9 | 28.4 |
18th harmonic [Nm] | 0 | 1471.4 | 282.9 |
24th harmonic [Nm] | 0 | 224.8 | 22.2 |
30th harmonic [Nm] | 0 | 118.9 | 2.9 |
36th harmonic [Nm] | 0 | 210 | 0.9 |
2.3 Wind turbine model
Surge | Sway | Heave | Roll | Pitch | Yaw | Tower |
---|---|---|---|---|---|---|
129.5 | 129.5 | 31.7 | 29.7 | 29.7 | 8.2 | 2.1 |
2.4 Generator model
2.5 Drivetrain model
Controller | HSS bearings | Coupling | Generator shaft | |
---|---|---|---|---|
\(\text{DT}_{1}\) | x | x | ||
\(\text{DT}_{2}\) | x | x | x | x |
\(k_{\text{diskpack}}\) [\(\frac{\text{MNm}}{\text{rad}}\)] | \(k_{\text{tube}}\) [\(\frac{\text{MNm}}{\text{rad}}\)] | \(I_{\text{gen},xx}\) [\(\text{kg}\,\text{m}^{2}\)] |
---|---|---|
12.5 | 26.35 | 534 |
2.6 Environmental conditions
\(u_{\text{hub}}\) [m/s] | TI [–] | \(H_{s}\) [m] | \(T_{p}\) [s] | \(\alpha\) [–] |
---|---|---|---|---|
12 | 0.15 | 5 | 12 | 0.14 |
2.7 Remaining useful life theory
3 Results and Discussion
3.1 Model comparison
Mean [kN] | Standard deviation [kN] | |
---|---|---|
\(\text{DT}_{1}\) | 254 | 6.4 |
\(\text{DT}_{2}\) | 254 | 15.1 |
3.2 Shaft responses
3.3 Gear-stage response
3.4 High-speed shaft bearing responses
3.5 Fatigue damage results
GP | \(\text{HS}_{A}\) | \(\text{HS}_{B}\) | \(\text{HS}_{C}\) | ||
---|---|---|---|---|---|
\(\text{DT}_{1}\) | \(\text{LC}_{1}\) | \(1.2\times 10^{-4}\) | \(1.2\times 10^{-4}\) | \(3.2\times 10^{-4}\) | \(2.2\times 10^{-4}\) |
\(\text{LC}_{2}\) | \(3.8\times 10^{-5}\) | \(3.6\times 10^{-5}\) | \(3.4\times 10^{-5}\) | \(4.4\times 10^{-5}\) | |
\(\text{DT}_{2}\) | \(\text{LC}_{1}\) | \(2.0\times 10^{-4}\) | 0.25 | 0.30 | 0.32 |
\(\text{LC}_{2}\) | \(-1.4\times 10^{-5}\) | 0.25 | 0.30 | 0.32 |
GP | \(\text{HS}_{A}\) | \(\text{HS}_{B}\) | \(\text{HS}_{C}\) | ||
---|---|---|---|---|---|
\(\text{DT}_{1}\) | \(\text{LC}_{1}\) | 52 | 4.5 | 5.3 | 3.2 |
\(\text{LC}_{2}\) | 1.8 | 0.13 | 0.15 | 0.09 | |
\(\text{DT}_{2}\) | \(\text{LC}_{1}\) | \(1.4\times 10^{-2}\) | \(-6.7\times 10^{-3}\) | \(2.9\times 10^{-2}\) | \(1.1\times 10^{-2}\) |
\(\text{LC}_{2}\) | \(1.0\times 10^{-2}\) | \(-1.0\times 10^{-4}\) | \(2.6\times 10^{-2}\) | \(8.5\times 10^{-3}\) |
GP | \(\text{HS}_{A}\) | \(\text{HS}_{B}\) | \(\text{HS}_{C}\) | ||
---|---|---|---|---|---|
\(\text{DT}_{1}\) | \(\text{LC}_{1}\) | 1.2 | 0.31 | 0.28 | 0.28 |
\(\text{LC}_{2}\) | \(3.3\times 10^{-2}\) | \(8.8\times 10^{-3}\) | \(7.6\times 10^{-3}\) | \(7.7\times 10^{-3}\) | |
\(\text{DT}_{2}\) | \(\text{LC}_{1}\) | \(2.5\times 10^{-3}\) | 1.1 | 0.65 | 0.54 |
\(\text{LC}_{2}\) | \(1.0\times 10^{-3}\) | 1.1 | 0.65 | 0.54 |