Introduction
Principles used to estimate finger pad deformations
Estimation via acceleration measured at the side of the finger
Estimation based on tangential force applied to finger pad
Experiment 1: Transfer function for fingertip accelerations
Apparatus
Procedure
Analysis
Experiment 2: Estimation of mechanical parameters of fingertip
Apparatus
Procedure
Analysis
Experiment 3: Comparison of acceleration- and force-based estimates of lateral deformation
Apparatus
Procedure
Analysis
Results
Gain of transfer function for fingertip (Experiment 1)
Mechanical parameters of fingertip (Experiment 2)
Participant | Stiffness: k (N/m) | Viscosity: c (Ns/m) |
---|---|---|
P1 | 830 | 2.1 |
P2 | 530 | 5.1 |
P3 | 1300 | 5.8 |
Comparison between the acceleration- and force-based estimates of finger pad deformations (Experiment 3)
Examples of estimated finger pad deformation
Comparison between the acceleration- and force-based estimates
Frequency (Hz) | 10 | 30 | 100 | 450 |
---|---|---|---|---|
Difference (μm) | 4.3 | 0.60 | 2.2 × 10−2
| 8.7 × 10−4
|
DT (10%) (μm) | 0.68 | 0.49 | 7.0 × 10−2
| 4.3 × 10−2
|
DT (20%) (μm) | 1.4 | 0.98 | 1.4 × 10−1
| 8.6 × 10−2
|