Table 1.
Mechanical properties of the 15 analogue experiment substrates. M, mass; L, length; Le, effective length; θ0, initial inclination; ω0, natural frequency; k, torsional stiffness; α, compliance parameter. These three latter parameters are calculated from the leaf model presented in §4.
| symbol | description | M (g) | L (cm) | Le (cm) | θ0 (°) | ω0 (rad s−1) | K (mN m rad−1) | α (—) |
|---|---|---|---|---|---|---|---|---|
| real | ||||||||
| b | blueberry | 0.21 | 3.8 | 3.6 | 13 | 102 | 1.4 | 5.4 |
| s | strawberry | 0.29 | 4.5 | 6.8 | 9 | 38 | 1.3 | 3.5 |
| c | citrus | 0.56 | 8.0 | 8.3 | 5 | 44 | 3.0 | 2.8 |
| t | tomato | 0.09 | 2.9 | 3.7 | 28 | 78 | 0.6 | 6.6 |
| artificial | ||||||||
| · | art. rigid horizontal | — | — | — | 0 | — | ∞ | 0 |
| × | art. rigid inclined | — | — | — | 45 | — | ∞ | 0 |
| ○ | art. compl. | 0.16 | 3.0 | 3.0 | −6 | 124 | 1.3 | 6.2 |
| ∇ | art. compl. | 0.23 | 3.0 | 3.1 | −4 | 112 | 1.3 | 4.8 |
| □ | art. compl. | 0.47 | 3.0 | 3.2 | 0 | 94 | 1.8 | 2.9 |
| ▹ | art. compl. | 0.78 | 3.0 | 3.3 | 3 | 88 | 2.7 | 1.9 |
| • | art. compl. | 0.34 | 6.0 | 5.2 | 3 | 45 | 0.8 | 4.5 |
| ▾ | art. compl. | 0.51 | 6.0 | 5.5 | 3 | 47 | 1.3 | 3.3 |
| ▪ | art. compl. | 0.84 | 6.0 | 5.8 | 2 | 65 | 4.5 | 2.2 |
| ▸ | art. compl. | 1.5 | 6.0 | 6.0 | 4 | 59 | 6.9 | 1.3 |
| ⋆ | art. compl. | 0.51 | 6.0 | 4.9 | 6 | 46 | 0.7 | 0.54 |
| * | liquid pool | — | — | — | 0 | — | — | 0 |