A modal analysis of whole-body vertical vibration, using a finite element model of the human body
A modal analysis of whole-body vertical vibration, using a finite element model of the human body
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DOI：
10.1006/jsvi.1996.0674
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发表时间：
1997-02-13
影响因子：
4.7
通讯作者：
Griffin, MJ
中科院分区：
文献类型：
--
作者：
Kitazaki, S;Griffin, MJ
本文用有限元法建立了人体对全身振动的二维生物力学响应模型。采用梁、弹簧和质量单元在正中矢状面对脊柱、内脏、头部、骨盆和臀部组织进行建模。该模型是通过与先前在实验室中测量的振动模态形状进行比较而开发的。在低于10 Hz的频率下，该模型产生了七个模式，这与测量结果吻合得很好。在约5 Hz处的驱动点响应的主共振由整个身体模式组成，其中头部、脊柱和骨盆几乎刚性地移动，骨盆下方的组织的轴向和剪切变形与垂直内脏模式同相发生。第二主共振在约8赫兹对应于骨盆的旋转模式，与第二内脏模式的可能贡献。当改变姿势时，驱动点响应的主共振的移位仅通过改变臀部组织的轴向刚度来实现。有人建议，增加臀部和大腿与座椅表面之间的接触面积，当改变姿势从直立到懒散，可能会降低骨盆下的轴向刚度，与非线性的力-变形关系的组织导致的自然频率降低。从直立到懒散的姿势变化也增加了整个身体模式下骨盆下方组织的剪切变形，并且由于组织的剪切刚度比轴向刚度低得多，自然频率降低。(C)出版社：Academic Press Limited。
A two-dimensional model of human biomechanical responses to whole-body vibration has been developed, by using the finite element method. Beam, spring and mass elements were used to model the spine, viscera, head, pelvis and buttocks tissue in the mid-sagittal plane. The model was developed by comparison of the vibration mode shapes with those previously measured in the laboratory. At frequencies below 10 Hz, the model produced seven modes which coincided well with the measurements. The principal resonance of the driving point response at about 5 Hz consisted of an entire body mode, in which the head, spinal column and the pelvis move almost rigidly, with axial and shear deformation of tissue beneath the pelvis occurring in phase with a vertical visceral mode. The second principal resonance at about 8 Hz corresponded to a rotational mode of the pelvis, with a possible contribution from a second visceral mode. A shift of the principal resonance of the driving point response, when changing posture, was achieved only by changing the axial stiffness of the buttocks tissue. It is suggested that an increase in contact area between the buttocks and the thighs and the seat surface, when changing posture from erect to slouched, may decrease the axial stiffness beneath the pelvis, with a non-linear force-deflection relationship of tissue resulting in decreases in the natural frequencies. A change in posture from erect to slouched also increased shear deformation of tissue beneath the pelvis in the entire body mode, and the natural frequency was decreased as a result of the much lower shear stiffness of tissue compared to the axial stiffness. (C) 1997 Academic Press Limited.