Sport and Physical Activity Research Centre, Sheffield Hallam University, Sheffield, UK.
Sport and Physical Activity Research Centre, Sheffield Hallam University, Sheffield, UK.
J Biomech. 2021 Jan 4;114:110151. doi: 10.1016/j.jbiomech.2020.110151. Epub 2020 Nov 27.
The accuracy and accessibility of methods to calculate body segment inertial parameters are a key concern for many researchers. It has recently been demonstrated that the magnitude and orientation of principal moments of inertia are crucial for accurate dynamic models. This is important to consider given that the orientation of principal axes is fixed for the majority of geometric and regression body models. This paper quantifies the effect of subject specific geometry on the magnitude and orientation of second moments of volume in the trunk segment. The torsos of 40 male participants were scanned using a 3D imaging system and the magnitude and orientation of principal moments of volume were calculated from the resulting geometry. Principal axes are not aligned with the segment co-ordinate system in the torso segment, with mean Euler angles of 11.7, 1.9 and 10.3 in the ZXY convention. Researchers using anatomical modelling techniques should try and account for subject specific geometry and the mis-alignment of principal axes. This will help to reduce errors in simulation by mitigating the effect of errors in magnitude of principal moments.
计算身体段惯性参数的方法的准确性和可及性是许多研究人员关注的关键问题。最近已经证明，主转动惯量的大小和方向对于准确的动力学模型至关重要。这一点很重要，因为对于大多数几何和回归身体模型，主轴的方向是固定的。本文量化了特定于主体的几何形状对躯干段体第二转动惯量的大小和方向的影响。使用三维成像系统对 40 名男性参与者的躯干进行扫描，并从所得几何形状计算出主体积转动惯量的大小和方向。在躯干段中，主轴与节段坐标系不重合，在 ZXY 约定中平均欧拉角为 11.7、1.9 和 10.3。使用解剖建模技术的研究人员应该尝试考虑特定于主体的几何形状和主轴的不对准。这将有助于通过减轻主转动惯量大小误差的影响来减少模拟中的误差。
