全腰椎有限元模态分析

Modal analysis of human lumbar spine using finite element method

目的 采用三维有限元方法研究人体腰椎的动力学特性。方法 基于CT扫描图像建立并验证全腰椎L1-5节段有限元模型，对全腰椎进行有限元模态分析。结果 提取腰椎的30阶自由模态，获得了腰椎在自由状态下的动态特性：腰椎共振频率分布集中；各阶模态最大振幅急剧变化，L5节段腰椎附近的振幅较大，是腰椎的薄弱环节。结论 腰椎的模态分析是进一步进行动力学分析的基础，确定腰椎的固有频率、振型和振幅等振动参数，对于腰椎的振动特性分析和人机工程设计优化等方面具有重要意义。

Objective To study dynamic characteristics of human lumbar spine using three-dimensional finite element method. Methods Finite element model of lumbar spine （L1-5） was developed and validated based on CT images, and the modal analysis was also conducted. Results A total of top 30-order modal parameters were extracted to obtain dynamic characteristics of the lumbar spine under free boundary conditions. Resonance frequencies of the model were concentrately distributed, but the amplitude of each order varied greatly. Amplitude near L5 segment was much larger, indicating L5 was easily to be injured. This lumbar modal analysis could provide a basis for its further dynamic analysis. Parameters such as natural frequency, modal shape and vibration amplitude of the lumbar spine would be helpful for both lumbar dynamic analysis and optimal design of man-machine interface mechanical equipment.