A model for the response of seated humans to sinusoidal displacements of the seat.
A model for the response of seated humans to sinusoidal displacements of the seat.
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DOI：
10.1016/0021-9290(74)90011-6
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发表时间：
1974-05
影响因子：
2.4
通讯作者：
Robert Muksian;Charles D. Nash
中科院分区：
文献类型：
--
作者：
Robert Muksian;Charles D. Nash
建立了人体坐姿的集总参数模型，包括头部、脊柱、上半身、胸腹脏器、骨盆和腿部。对于分别代表物理系统的弹性和阻尼的非线性弹簧和阻尼器，写出了孤立质量的刚体表示的运动微分方程。运动方程中还包括用于模拟滑动表面和体内相关肌肉收缩的库仑摩擦力，以及心冲击描记术和膈肌肌肉力。所有的运动限制在垂直方向和正弦位移的座椅作为输入，实现了良好的协议与机械和主观的实验响应。此外，与肌肉力的频率依赖性一致，暗示了频率依赖阻尼系数的可能性。
A lumped-parameter model of the human body in the sitting position is formulated which includes the head, vertebral column, upper torso, abdomen-thorax viscera, pelvis and legs. The differential equations of motion for the rigid-body representation of the isolated masses were written for nonlinear springs and dashpots which represented the elasticity and damping, respectively, of the physical system. Also included in the equations of motion were coulomb friction forces for modeling sliding surfaces and related muscle contractions in the body, and the ballistocardiographic and diaphragm muscle forces. With all motions restricted to the vertical direction and sinusoidal displacements of the seat as the inputs, excellent agreement with mechanical and subjective experimental responses was achieved. Additionally, in agreement with the frequency dependency of muscle forces, the possibility of frequency dependent damping coefficients was implied.