基于超级计算人体骨骼肌系统弯腰搬物整体有限元的建模与仿真

Integrated finite element modeling and simulation of entire musculoskeletal system weightlifting based on super-computer

背景:目前有限元模型的建立大多通过CT成像技术建立三维三角面片模型,然后通过商业软件转换成四面体有限元网格,但建立的有限元模型无实体模型,不能进行切割或植入假体。目的:建立人体骨骼肌系统整体有限元模型,并对人体骨骼肌系统弯腰搬物运动进行基于超级并行计算的整体有限元仿真分析。方法:针对中国数字人工程所获得的冷冻切片数据进行人体骨骼肌系统的整体三维重建;建立人体骨骼肌系统各肢体部分有限元模型,利用系统集成的方法建立人体骨骼肌系统的整体有限元模型;对人体骨骼肌系统弯腰搬物运动行运动捕捉测量实验,进行人体骨骼肌系统弯腰搬物的整体有限元仿真分析。结果与结论:建立了人体骨骼肌系统的整体有限元模型,人体弯腰搬物过程中总体有限元仿真分析显示,腰椎部分是提供人体弯腰搬物运动的主要动力部分,而胸椎则在整个弯腰搬物运动中起的作用不大,结果分析同解剖学和生理学上的解释一致。说明建立的人体骨骼肌系统整体有限元系统集成建模方法和模型,能够有效真实地对人体骨骼肌系统整体运动过程中的微观力学行为进行仿真分析,为从整体角度研究人体骨骼肌系统的深层次力学现象提供了一种新方法。

BACKGROUND：Currently,finite element models are mostly established based on CT imaging to prepare a three dimensional triangular patch model,and then converted into a tetrahedral finite element mesh via commercial software.However,the finite element model has no solid model,and cannot be cut or used as implants.OBJECTIVE：Based on the anatomical three-dimensional models of China Mechanical Virtual Human Project,an integrated finite element model of entire human musculoskeletal system was built.The weightlifting motor task was implemented and simulated using the proposed finite element model based on the super-computer.METHODS：Firstly,the three-dimensional models of the musculoskeletal system were reconstructed from the cross-sectional images.Secondly,the segmental finite element model of human musculoskeletal system was built.The finite element model of the entire human musculoskeletal system was constructed through system integrating method.In the end,the motion capture experiment of weightlifting motor task was implemented.The finite element model of the entire human musculoskeletal system weightlifting was simulated and analyzed based on the super-computer Dawning 4000A in Shanghai Super-computer Center.RESULTS AND CONCLUSION：The integrated method of human musculoskeletal system finite element modeling was developed.An entire human musculoskeletal system finite element model was built.The weightlifting motor task was simulated and the stresses contours of entire musculoskeletal system were obtained.The proposed human musculoskeletal system model could describe the microcosmic mechanical phenomenon of human musculoskeletal system efficaciously and genuinely.It provides a new method for human musculoskeletal biomechanics analysis.