Research Article
[Retracted] Research on Optimal Control Method of Tennis Racket String Diameter Based on Kalman Filter Algorithm
Table 4
Swing vibration frequency of different material groups.
| NO | 16L polyester thread | 16L nylon imitation gut | NO | 16L polyester thread | 16L nylon imitation gut | NO | 16L polyester thread | 16L nylon imitation gut |
| 1 | 4.36 | 5.88 | 17 | 5.76 | 5.75 | 33 | 5.80 | 4.70 | 2 | 5.46 | 5.56 | 18 | 4.62 | 4.91 | 34 | 5.63 | 6.20 | 3 | 5.26 | 5.24 | 19 | 5.56 | 5.40 | 35 | 5.47 | 5.86 | 4 | 5.25 | 4.92 | 20 | 5.62 | 5.44 | 36 | 5.55 | 5.40 | 5 | 5.30 | 5.84 | 21 | 5.77 | 5.42 | 37 | 5.87 | 6.08 | 6 | 5.03 | 5.86 | 22 | 4.92 | 5.28 | 38 | 5.58 | 4.88 | 7 | 4.81 | 5.63 | 23 | 5.56 | 4.72 | 39 | 4.62 | 5.17 | 8 | 4.83 | 5.97 | 24 | 4.41 | 5.12 | 40 | 4.62 | 6.06 | 9 | 4.80 | 5.67 | 25 | 5.06 | 5.28 | 41 | 5.00 | 4.72 | 10 | 5.28 | 5.25 | 26 | 4.75 | 6.05 | 42 | 5.00 | 6.28 | 11 | 4.80 | 4.92 | 27 | 4.53 | 5.75 | 43 | 5.28 | 5.98 | 12 | 4.43 | 5.08 | 28 | 5.85 | 5.37 | 44 | 5.83 | 4.74 | 13 | 5.14 | 5.15 | 29 | 5.49 | 4.79 | 45 | 5.21 | 5.11 | 14 | 5.63 | 5.16 | 30 | 5.49 | 4.85 | 46 | 4.84 | 4.91 | 15 | 4.77 | 5.08 | 31 | 4.55 | 6.23 | 47 | 5.74 | 5.74 | 16 | 4.92 | 5.32 | 32 | 4.86 | 4.92 | 48 | 4.39 | 5.11 |
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