Table 4 Optimum friction \( {\mu}_d \) and exponent gradient m obtained through MDO for FGT inversion tube
Number of cycle | Design parameter interval | Optimal exponent gradient \( m \) | Optimal friction \( {\mu}_{\mathrm{d}} \) | SEA (kJ/kg) | P max (kN) |
|---|---|---|---|---|---|
1 | 3 < m < 4 0.01 < μ d < 0.02 | 4 | 0.02 | 44.16 | 49.51 |
2 | 4 < m < 5 0.02 < μ d < 0.03 | 5 | 0.029 | 48.2 | 43.29 |
3 | 5 < m < 6 0.03 < μ d < 0.04 | 5.8 | 0.031 | 51.3 | 39.43 |
4 | 6 < m < 8 0.03 < μ d < 0.035 | 7.3 | 0.03 | 54.6 | 35.18 |
5 | 7 < m < 8 0.03 < μ d < 0.033 | 7.3 | 0.031 | 57.9 | 33.2 |