加速度造成不对称周边视力丧失的仿真研究

发布时间：2018-07-30 07:29

【摘要】：复合高过载加速度将导致人体不对称的周边视力丧失,会成为飞行安全的极大隐患。基于此,本文提出用数值仿真的手段探究加速度对双眼视力的影响,以期探索复合加速度造成人体不对称周边视力丧失的力学机制。本文首先将计算机断层扫描(CT)的成年人头骨序列图像进行三维重建,得到含有双眼眼眶的头骨仿真模型。再将之前建立的单眼球模型进行镜像,得到双眼模型,匹配至头骨模型中,并填充脂肪加以完善。对该模型分别加载头-足方向的加速度载荷(Gz)、右-左方向的加速度载荷(Gy)、胸-背方向的加速度载荷(Gx)以及三个方向的复合加速度载荷,利用显式动力学算法,得到视网膜的动态力学响应。仿真研究结果表明,复合加速度作用下双眼应变相差25.7%,其分布特征具有明显差异。本文通过建立双眼有限元模型,为探索复合加速度造成不对称的周边视力丧失的机制性研究提供一种新的手段。
[Abstract]:Compound high overload acceleration will lead to the loss of asymmetric peripheral visual acuity of human body, which will become a great hidden danger of flight safety. Based on this, this paper proposes a numerical simulation method to explore the effect of acceleration on binocular vision, in order to explore the mechanical mechanism of compound acceleration resulting in the loss of human body's asymmetric peripheral visual acuity. In this paper, we first reconstruct the adult skull sequence image of (CT) by computed tomography (CT), and obtain the skull simulation model with binocular orbit. The single eye model was mirrored and the binocular model was matched to the skull model. For the model to load the acceleration load in the head-foot direction respectively, (Gz), acceleration load in the right-left direction, (Gy), acceleration load in the chest and back direction, and the composite acceleration load in the three directions, the explicit dynamic algorithm is used. The dynamic mechanical response of retina was obtained. The simulation results show that the strain difference of binocular strain is 25.7g under the action of compound acceleration, and the distribution characteristics of binocular strain are obviously different. In this paper, a binocular finite element model is established to provide a new method for exploring the mechanism of asymmetric peripheral vision loss caused by composite acceleration.
【作者单位】：北京航空航天大学生物与医学工程学院生物力学与力生物学教育部重点实验室;中国人民解放军空军航空医学研究所;
【基金】：国家自然科学基金资助项目(11502013) 国防基础科研计划资助项目(JCKY2016601B009) 总后重大专项资助项目(AKJ11J002)
【分类号】：R85

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