基于网格变换技术的9岁儿童C4-C5颈椎有限元模型开发与验证  

Development and Validation of Finite Element Models for the 9 Years-old Child's C4-C5 Cervical Spine Based on Mesh Morphing

作　　者：吴俊[1,2] 李俊义[1] 曹立波 喻志强[1] 吴金正 WU Jun;LI Junyi;CAO Libo;YU Zhiqiang;WU Jinzheng(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;College of Engineering and Design,Hunan Normal University,Changsha 410081,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南师范大学工程与设计学院,湖南长沙410081

出　　处：《湖南大学学报（自然科学版）》2018年第4期26-33,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51505137);湖南大学汽车车身先进设计制造国家重点实验开放基金(31615007)~~

摘　　要：针对通过手动画高质量网格的传统有限元建模方法存在建模周期长的问题,应用网格变换技术,结合开发的一套自动识别并提取标识点的方法,快速地建立了9岁儿童C4-C5颈椎有限元模型.应用材料缩放的方法,获得了9岁儿童颈部材料参数,并参考尸体试验数据,在拉伸、前屈及后伸工况下对模型进行了验证.结果显示,与全部人工识别并提取标志点的方法相对比,该套取点方法节约了2/3~3/4的时间.开发的有限元模型网格质量高,平均几何模型精度误差是0.46mm.模型仿真输出值与试验值吻合良好,精度达到90%以上.通过该方法开发有限元模型可节省大量的时间,并且模型具有较高的生物逼真度.同时该方法具有较强的适应性,可应用于各类复杂几何的快速有限元建模.The traditional finite element(FE)modeling method of manually generating high-quality mesh is very time-consuming.In this study,a method of identifying and extracting landmarks automatically was proposed.9 years old child's C4-C5 cervical spine based on mesh morphing was developed rapidly.A scaling method was used to calculate the material properties of 9 years old child's C4-C5 cervical spine.The morphed FE model was validated by 9 years old child's post-mortem human subject data under the conditions of stretch,flexion and extension.The analysis results showed that the time for landmarks selection was reduced by 2/3 to 3/4 through the automatic method in comparison to the traditional method.The mesh quality of the morphed FE model was of higher quality and was close to the baseline FE model.The mean geometric error was 0.46 mm.The simulated output value of the model was in good agreement with the experimental value,and the accuracy was over 90%.This proposed method can save large amount of time for identifying and extracting landmarks and can develop the morphed model with high biomechanical fidelity.At the same time,the method shows a strong adaptability and can be applied to the finite element modeling of various complex geometries.

关 键 词：网格变换技术 快速 儿童颈椎 有限元模型 验证 

分 类 号：U461.91[机械工程—车辆工程] R318.01[交通运输工程—载运工具运用工程]