Table 1 Vibration parameters of pear leaves
Inflow velocity(m/s) | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|
Compression stage | ||||||
 Amplitude (cm) | 3.1 ± 0.7 | 5.0 ± 0.4 | 6.0 ± 0.6 | 7.1 ± 0.8 | 8.1 ± 0.8 | 10.1 ± 1.3 |
 Swing angle (°) | 39.5 ± 4.5 | 59.5 ± 2.9 | 77.5 ± 3.7 | 103.0 ± 5.7 | 130.5 ± 6.1 | 157.0 ± 9.8 |
 Average angular velocity (rad/s) | 4.9 ± 0.6 | 5.2 ± 0.3 | 6.8 ± 0.3 | 9.0 ± 0.5 | 11.4 ± 0.5 | 13.7 ± 0.9 |
High-frequency small-amplitude vibration stage | ||||||
 Amplitude (cm) | 2.2 ± 0.4 | 2.6 ± 0.4 | 1.9 ± 0.2 | 1.8 ± 0.2 | 1.8 ± 0.3 | 1.6 ± 0.2 |
 Swing angle (°) | 32.5 ± 6.2 | 37.5 ± 6.0 | 27.8 ± 2.7 | 26.5 ± 2.9 | 22.5 ± 2.6 | 22.0 ± 2.0 |
 Average angular velocity (rad/s) | 2.9 ± 0.6 | 3.9 ± 0.7 | 3.8 ± 0.4 | 4.5 ± 0.7 | 4.9 ± 0.7 | 5.7 ± 0.9 |
Rebound stage | ||||||
 Amplitude (cm) | 3.2 ± 0.7 | 4.8 ± 0.6 | 5.9 ± 0.5 | 7.0 ± 0.8 | 7.8 ± 0.8 | 10.0 ± 1.1 |
 Swing angle (°) | 39.5 ± 3.7 | 60.5 ± 2.9 | 76.5 ± 3.4 | 100.5 ± 5.3 | 129.5 ± 6.1 | 157.5 ± 11.8 |
 Average angular velocity (rad/s) | 3.4 ± 0.3 | 5.3 ± 0.3 | 6.6 ± 0.3 | 8.8 ± 0.5 | 11.3 ± 0.5 | 13.7 ± 1.0 |