Research Article
[Retracted] Research on Optimal Control Method of Tennis Racket String Diameter Based on Kalman Filter Algorithm
Table 5
The vibration frequency of the racket acceleration and impact of different string diameter groups.
| NO | 16L polyester thread | No. 18 polyester thread | NO | 16L polyester thread | No. 18 polyester thread | NO | 16L polyester thread | No. 18 polyester thread |
| 1 | 37.88 | 38.2 | 17 | 38.14 | 38.2 | 33 | 37.97 | 38.2 | 2 | 37.44 | 38.2 | 18 | 37.83 | 38.2 | 34 | 38.02 | 38.2 | 3 | 37.89 | 38.2 | 19 | 37.90 | 38.2 | 35 | 37.49 | 38.2 | 4 | 37.60 | 38.2 | 20 | 37.56 | 38.2 | 36 | 37.80 | 38.2 | 5 | 37.42 | 38.2 | 21 | 37.77 | 38.2 | 37 | 37.95 | 38.2 | 6 | 38.05 | 38.2 | 22 | 37.99 | 38.2 | 38 | 37.78 | 38.2 | 7 | 37.34 | 38.2 | 23 | 38.08 | 38.2 | 39 | 37.59 | 38.2 | 8 | 37.52 | 38.2 | 24 | 38.15 | 38.2 | 40 | 37.62 | 38.2 | 9 | 37.91 | 38.2 | 25 | 37.92 | 38.2 | 41 | 38.13 | 38.2 | 10 | 38.02 | 38.2 | 26 | 38.11 | 38.2 | 42 | 38.01 | 38.2 | 11 | 37.40 | 38.2 | 27 | 37.68 | 38.2 | 43 | 37.89 | 38.2 | 12 | 37.87 | 38.2 | 28 | 37.51 | 38.2 | 44 | 37.93 | 38.2 | 13 | 37.86 | 38.2 | 29 | 37.63 | 38.2 | 45 | 37.69 | 38.2 | 14 | 37.38 | 38.2 | 30 | 37.85 | 38.2 | 46 | 37.87 | 38.2 | 15 | 37.70 | 38.2 | 31 | 38.19 | 38.2 | 47 | 37.51 | 38.2 | 16 | 37.67 | 38.2 | 32 | 37.35 | 38.2 | 48 | 38.02 | 38.2 |
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