山羊瘤胃的三维重建及有限元分析

Three Dimensional Reconstruction and Finite Element Model Analysis of Goat Rumen

作者基于山羊瘤胃CT图像对湘东黑山羊瘤胃进行三维重建及有限元模型仿真分析,拟建立山羊瘤胃的几何模型和有限元模型。首先利用三维重建软件Mimics重建山羊瘤胃几何模型,再利用Solidworks把几何模型的格式转换为IGES格式导入到有限元分析软件Hyperworks中形成有限元网格模型,最后通过Hyperworks、Ls_dyna联合仿真,对体外重构的瘤胃有限元模型进行力学性能分析。结果表明,体外重构的瘤胃模型与活体动物瘤胃有高度的几何相似性,能够清楚地展现出瘤胃的囊腔结构;并且获得对瘤胃模型进行力学分析后的应力、应变和位移云图;建立可视化瘤胃的几何模型和有限元模型;描绘出瘤胃在自然状态下的外形结构以及生物力学特性。本研究验证了三维重建及有限元法在山羊瘤胃建模中的可行性,同时也为瘤胃重构方面的研究开辟了先河,在动物组织模型构建上开辟了新的途径。

This study was carried out to establish geometric model and finite element model of goat rumen,three dimensional reconstruction and finite element simulation model were used based on CT images of rumen of Xiangdong black goats.Firstly,the three dimensional reconstruction software(Mimics)was used to reconstruct the geometric model of rumen,and then Solidworks was used to convert the geometric model into IGES format and import it into the finite element mesh model in the finite element analysis software Hyperworks.Finally,Hyperworks and Ls_dyna combined simulation were used to analyze the mechanical properties of the in vitro reconstructed finite element model of rumen.The results indicated that in vitro reconstructed rumen model was similar to the rumen of living animals geometrically,and this model can clearly reflect the lumen structure of the rumen.After the mechanical analysis of the rumen model,the stress,strain and displacement nephograms of the rumen model were obtained.Geometric model and finite element model of visual rumen were established to reflect the appearance structure and biomechanical characteristics of rumen in natural state.These results indicated that the feasibility of three dimensional reconstruction and finite element method in goat rumen modeling were also verified,which built up a new method for rumen reconstruction and construction researching.