Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental
2.2. Data Analysis
2.3. Mathematical Modelling (Sagittal Plane)
- = centre of mass segments A, B, C, D, E and G, respectively
- = length of segments
- = distances of centre of mass from their proximal ends
- = mutually orthogonal unit
- = torque of each joints
: | Vector of applied torque |
M: | Mass matrix |
: | Angular acceleration vector |
: | Vector of moments from gravitational forces |
: | Vector of moments from external forces |
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Joint | Phase | Joint Movement Direction |
---|---|---|
Arm | Preparation to land | Extension (−) |
Foot strike | Extension (−) | |
Elbow | Preparation to land | Flexion (+) |
Foot strike | Flexion (+) | |
Shoulder | Preparation to land | Flexion (+) |
Foot strike | Flexion (+) | |
Hip | Preparation to land | Flexion (+) |
Foot strike | Flexion (+) | |
Knee | Preparation to land | Flexion (+) |
Foot strike | Flexion (+) | |
Ankle | Preparation to land | Plantar Flexion (−) |
Foot strike | Dorsiflexion (+) |
Professional | Amateurs | |||||
---|---|---|---|---|---|---|
Variable | Mean ± SD | Max | Min | Mean ± SD | Max | Min |
Torque (Nm) | ||||||
Wrist | −384.73 ± 26.95 | −751.32 | −1590.02 | 212.05 ± 78.67 | 2809.92 | −4627.90 |
Elbow | 158.76 ± 38.86 | 656.97 | −134.27 | 494.07 ± 94.61 | 3318.81 | −3185.36 |
Shoulder | 177.78 ± 48.47 | 300.03 | 153.52 | 160.42 ± 66.56 | 3074.12 | −4236.73 |
Hip | 50.44 ± 19.82 | 65.23 | 51.35 | −22.62 ± 19.75 | 710.43 | −968.52 |
Knee | 49.34 ± 18.73 | 93.99 | 61.08 | 42.00 ± 23.23 | 123.57 | −187.37 |
Ankle | −24.30 ± −3.15 | −26.75 | −51.42 | 11.43 ± −8.37 | 87.62 | −57.96 |
Frame | Runge-Kutta (Rad) (r) | Experimental Result (Rad)(s) | |
---|---|---|---|
1 | 1.90437 | 1.89949 | 0.25691% |
2 | 1.98698 | 1.99188 | 0.24596% |
3 | 1.74827 | 1.75034 | 0.11842% |
4 | 1.79565 | 1.79817 | 0.14016% |
5 | 2.07085 | 2.06973 | 0.05394% |
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Aziz, S.; Rambely, A.S.; Gan, K.B.; Wan Din, W.R. Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method. Mathematics 2020, 8, 917. https://doi.org/10.3390/math8060917
Aziz S, Rambely AS, Gan KB, Wan Din WR. Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method. Mathematics. 2020; 8(6):917. https://doi.org/10.3390/math8060917
Chicago/Turabian StyleAziz, Syazwana, Azmin Sham Rambely, Kok Beng Gan, and Wan Rozita Wan Din. 2020. "Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method" Mathematics 8, no. 6: 917. https://doi.org/10.3390/math8060917