Synthesis of standing-up trajectories using dynamic optimization
Synthesis of standing-up trajectories using dynamic optimization
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DOI：
10.1016/j.gaitpost.2003.11.004
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发表时间：
2005-01-01
期刊：
影响因子：
2.4
通讯作者：
Bajd, T
中科院分区：
文献类型：
--
作者：
Kuzelicki, J;Zefran, M;Bajd, T
研究了动态优化作为计算站立轨迹的工具。对5名正常人和5名股骨截肢者的坐立动作进行了测量。记录作用于人体的运动和地面反作用力。建立了五段式站立运动的三维动力学模型。在每个特定的受试者中，确定了产生与测量的站立运动最相似的轨迹的优化标准。由于完好者在选择站立轨迹时使用的标准与截肢者有很大不同，因此通过最小化具有不同结构的每组个体的成本泛函(CF)来计算最优轨迹。在完好无损的人身上，发现了一种独特的成本函数，它产生了现实的站立动作。在截肢者中，使用了特定于受试者的参数集，这些参数表明在优化特定肌肉组的努力方面略有不同的偏好。(C)2004年，爱思唯尔出版。
Dynamic optimization as a tool to compute standing-up trajectories was investigated. Sit-to-stand manoeuvres in five intact persons and five trans-femoral amputees were measured. Movements and ground reaction forces acting on the body were recorded. A five-segment 3D dynamic model of standing-up was developed. In each particular subject, the optimization criterion which yielded trajectories that best resemble the measured standing-up movement was determined. Since the intact persons used considerably different criteria in choosing the standing-up trajectories than the amputees, the optimal trajectories were computed by minimizing cost functionals (CF) with distinctive structures for each group of individuals. In intact persons, a unique cost functional was found which yielded realistic standing-up manoeuvres. In amputees, subject-specific sets of parameters indicating slightly different preferences in optimizing the effort of particular muscle groups were used. (C) 2004 Published by Elsevier B.V.