基于优化的中国50th人体大腿有限元模型验证方法的研究

A Study on the Validation Method of the 50th Percentile Chinese Thigh Finite Element Model Based on Optimization

目前的假人和人体有限元模型大多是根据欧美人体建立的,故由人体身材的差别引起生物力学的响应的差异值得探讨。建立中国50th人体有限元模型有助于提高中国人体的损伤防护水平。通过CT扫描数据获得大腿的几何模型,并将其缩放到中国50th的人体股骨尺寸。根据股骨解剖学结构将股骨头、股骨颈、股骨体和内外侧髁等的皮质骨和松质骨赋予不同的材料参数,并利用LS-OPT对大腿模型的材料参数进行优化,使仿真结果与缩放至中国50th人体股骨尺寸的实验数据吻合,以满足不同的加载部位、加载方向和加载速率等载荷工况的验证要求。仿真结果表明优化后的模型具有较高的生物逼真度,并能适应多种载荷工况。

At present,crash dummies and finite element human models are mainly created based on occidental human statistical data,so the differences in biomechanical response caused by the differences in human stature are worth exploring. Establishing the 50 th percentile Chinese model is conducive to improving the injury protection level of Chinese people. Based on CT scan data,thigh geometry model is obtained and scaled to the 50 th percentile Chinese human femur size. Different material parameters are given to the cortical and cancellous bones of femoral head,femoral neck,femoral body and lateral condyles according to femoral anatomic structure. The material parameters of thigh model are optimized by using LS-OPT to make simulation results well agree with experimental data of the 50 th percentile Chinese thigh size and meet the validation requirements for loading conditions with different locations,directions and rates of loading. The results of simulation show that the model optimized has higher biological fidelity and can be adapted to a variety of loading conditions.