Open Access
Table 1
Variance analysis table of efficiency considering interaction.
| Source | Sum of squares | DoF | Mean square | F ratio | Significance P |
|---|---|---|---|---|---|
| A (Vacuum) | 0.200 | 5 | 0.040 | 1100.5 | 1.28e–25 |
| B (Temperature) | 1.059 | 4 | 0.265 | 7278.6 | 5.45e–34 |
| C (Speed) | 0.595 | 3 | 0.198 | 5454.2 | 9.89e–32 |
| D (Torque) | 16.882 | 3 | 5.627 | 154751.4 | 1.05e–47 |
| A × B | 0.219 | 20 | 0.011 | 301.2 | 2.41e–22 |
| A × C | 0.008 | 15 | 5.5e–4 | 15.1 | 3.03e–8 |
| A × D | 0.071 | 15 | 4.7e–3 | 129.5 | 6.53e–18 |
| B × C | 0.073 | 12 | 0.006 | 167.4 | 1.00e–18 |
| B × D | 0.312 | 12 | 0.026 | 716.0 | 1.30e–25 |
| C × D | 0.164 | 9 | 0.018 | 500.5 | 2.54e–23 |
| A × B × C | 0.020 | 60 | 3.3e–4 | 9.1 | 2.35e–7 |
| A × B × D | 0.070 | 55 | 1.28e–3 | 35.1 | 2.85e–13 |
| A × C × D | 0.006 | 45 | 1.33e–4 | 3.7 | 8.5e–4 |
| B × C × D | 0.029 | 36 | 8.05e–4 | 22.1 | 7.39e–11 |
| A × B × C × D | 0.021 | 163 | 1.3e–4 | 3.6 | 4.9e–4 |
| Error | 8e–4 | 22 | 3.636e–5 | – | – |
| Sum T | 21.710 | 479 | – | – | – |
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