TY - GEN
T1 - Development of two-dimensional biomechanical modeling of the thumb for pipetting
AU - Kim, Eunsik
AU - Freivalds, Andris
AU - Sung, Kiseok
AU - Cho, Jay
N1 - Publisher Copyright:
Copyright 2015 Human Factors and Ergonomics Society.
PY - 2015
Y1 - 2015
N2 - The aim of this study is to develop a two-dimensional biomechanical static thumb model based on the posture of the hand using pipette. This model used hand anatomy and static equilibrium conditions to estimate internal tendon forces against a given external force. The input variables can be divided into two groups: 1) joint angle, external load and bone length, which are directly measured from the test; and 2) tendon force ratio and moment arm, which are adopted from previous studies. The thumb model was simulated using an FSR (forcesensing resistor) and validated using an Electromyography (EMG) system with four grip heights from 1 to 4 cm and with two tasks: Aspirating and Dispensing. A similar trend was observed between the simulation and EMG results. The average thumb pressure for Dispensing tasks is about 3.1 times greater than that for Aspirating, and the overall force efficiency ratio for both tasks is around 8 times the external load. The optimal grip height is 3 cm in terms of grip strength, 1 or 3 cm in terms of minimum internal force and 1 cm in terms of force efficiency. Overall, the optimal grip height is 1 or 3 cm.
AB - The aim of this study is to develop a two-dimensional biomechanical static thumb model based on the posture of the hand using pipette. This model used hand anatomy and static equilibrium conditions to estimate internal tendon forces against a given external force. The input variables can be divided into two groups: 1) joint angle, external load and bone length, which are directly measured from the test; and 2) tendon force ratio and moment arm, which are adopted from previous studies. The thumb model was simulated using an FSR (forcesensing resistor) and validated using an Electromyography (EMG) system with four grip heights from 1 to 4 cm and with two tasks: Aspirating and Dispensing. A similar trend was observed between the simulation and EMG results. The average thumb pressure for Dispensing tasks is about 3.1 times greater than that for Aspirating, and the overall force efficiency ratio for both tasks is around 8 times the external load. The optimal grip height is 3 cm in terms of grip strength, 1 or 3 cm in terms of minimum internal force and 1 cm in terms of force efficiency. Overall, the optimal grip height is 1 or 3 cm.
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U2 - 10.1177/1541931215591190
DO - 10.1177/1541931215591190
M3 - Conference contribution
AN - SCOPUS:84981736503
T3 - Proceedings of the Human Factors and Ergonomics Society
SP - 1212
EP - 1216
BT - 2015 International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2015
PB - Human Factors and Ergonomics Society Inc.
T2 - 59th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2015
Y2 - 26 October 2015 through 30 October 2015
ER -