Research Article
Development of Automatic Equipment for Washing and Nondestructive Inspection of Stud Bolt
(a) Analysis of variance for S-N ratios |
| | Level | S-N ratio | | Washing liquid injection pressure | Air injection pressure | Rotational speed of brush shaft | Washing time |
| | 1 | 38.72 (2 bar) | 38.82 (3 bar) | 37.63 (90 rpm) | 38.23 (5 s) | | 2 | 38.98 (3 bar) | 38.88 (5 bar) | 39.12 (180 rpm) | 39.03 (15 s) | | 3 | 38.62 (5 bar) | 38.63 (7 bar) | 39.58 (360 rpm) | 39.07 (30 s) | | Variance | 0.04 | 0.02 | 1.04 | 0.23 | | Rank | 3 | 4 | 1 | 2 |
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(b) Analysis of variance for responses |
| | Level | Response | | Washing liquid injection pressure | Air injection pressure | Rotational speed of brush shaft | Washing time |
| | 1 | 87.10 (2 bar) | 88.13 (3 bar) | 76.23 (90 rpm) | 82.00 (5 s) | | 2 | 89.27 (3 bar) | 88.23 (5 bar) | 90.57 (180 rpm) | 89.77 (15 s) | | 3 | 85.70 (5 bar) | 85.70 (7 bar) | 95.27 (360 rpm) | 90.30 (30 s) | | Variance | 3.24 | 2.05 | 98.37 | 21.60 | | Rank | 3 | 4 | 1 | 2 |
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