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근골격 시뮬레이션을 이용한 보행 중 지면반력 중심위치 추정방법
정이환(Yihwan Jung),정문기(Moonki Jung),이건우(Kunwoo Lee),구승범(Seungbum Koo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Musculoskeletal kinematics analysis is possible when all external force information including ground reaction force(GRF) are provided. However using force plate has limitation in installation depending on environments. In this study, we developed a simulation method that can predict the center of pressure on the foot from kinematics data utilizing artificial muscles between the foot and ground, which are conditionally activated during musculoskeletal simulation. The artificial muscles on the foot were activated when the distance of foot node and ground node is smaller than the pre-definded value. In this study we demonstrated the predictions of ground reaction force and center of pressure on the foot using inverse dynamics simulation with conditionally activated artificial muscles. The results were validated against the measured values from a force plate.
정이환(Yihwan Jung),정문기(Moonki Jung),이건우(Kunwoo Lee),구승범(Seungbum Koo) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Human dynamics simulation requires external forces and moment. During gait analysis the full ground reaction forces and moments can be obtained using force plates. In some testing situations such as slope ascending/descending and stair walking full external ground reactions cannot be easily obtained while the joint kinematics can be obtained using camera systems. Recently mobile insole type pressure mat systems have been developed. The mobile pressure mat provides the pressure distribution and the center of pressure on the foot during walking though the shear forces (FX and FY) and the free moment along the vertical direction to ground (MZ) cannot be provided. The purpose of our study was to create a human musculoskeletal model and simulation to predict the shear forces and free moment from joint kinematics and pressure mat data. The predicted values were validated against the true values obtained from force plates.