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Table 1.
Factors, intervals and levels of variation.
| Factor designation | Factor name | Level of variation | Step of variation | |||
|---|---|---|---|---|---|---|
| Code | Nat. | Upper ‐1 | Opt. 0 | Lower +1 | ||
| X1 | ωs, c‐1 | Rotor speed | 41.89 | 52.36 | 62.83 | 10.47 |
| X2 | Ao, м | Rotor ampli‐ tude oscillati ons | 0.002 | 0.004 | 0.006 | 0.002 |
| X3 | ωo, c‐1 | Rotor rotation frequ‐ ency | 41.89 | 62.83 | 83.77 | 20.94 |
| X4 | Ssf, м2 | Area of the free feed section of the feeding of brewer pellets | 0.00064 | 0.00072 | 0.0008 | 0.00008 |
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