摘要
目的 用模态分析法建立人颅颌面骨骼系统的动力学模型。 方法 以新鲜人尸体颅骨为实验模型 ,划分 37个测点。采用脉冲激励测试技术中 1点测量多点敲击的方法 ,以力锤激励颅骨 ,同时测量激励和加速度响应曲线。通过数据采集仪将信号送入工作站中进行传递函数分析 ,建立频响函数矩阵并求出系统的模态参数 ,进而建立颅颌面骨骼系统的动力学方程。对模型进行互易性和可靠性检验。 结果 头颅结构在外载荷作用下的振动以一阶模态振型为主 ,前4阶模态主要分布在 2 0 0Hz以下 ,分别为 31.48,78.82 ,140 .98,2 0 0 .6 7Hz。颅骨结构具有很好的互易性。用数学模型计算的理论传递函数曲线和实测传递函数曲线相能够很好的吻合。结论 模态分析方法为研究人体在冲击载荷下的动态响应和损伤机制提供了重要信息 。
Objective To deduce the dynamic model of human skull with modal analysis. Methods On the human skull thirty seven testing points were plotted out. The pulse shock produced by a hammer was loaded respectively to each point and the acceleration respond to the point 37 was recorded at the same time. These data were input into the workstation by the data collection apparatus to acquire the transfer functions and to upbuild the matrix of the transfer functions, from which the modal parameters were figured out. Then the dynamic models of the human skull were deduced based on the modal parameters. The interoperability testing of the skull and reliability testing of the dynamic models were performed. Results The vibration of skull structure under outer loading was mostly dominated by the shape of the first rank. The former 4 modals distributed under 200Hz, 31.48,78.82,140.98 and 200.67 Hz, respectively. The skull structure had good interoperability and the theoretic transfer functions calculated from dynamic model were well consistent with the practical transfer functions. Conclusions The modal analysis produces important information on dynamic respond and injury mechanism of human skull under impact loading. The skull dynamic models deduced from modal analysis has certain reliability.
出处
《中华创伤杂志》
CAS
CSCD
北大核心
2000年第12期716-719,共4页
Chinese Journal of Trauma
基金
国家自然科学基金资助项目(39700163)
关键词
生物力学
模型
数学
颅骨
创伤和损伤
Biomechanics
Modal,mathematics
Skull
Wounds and injuries
