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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 ,用模态试验法建立的颅骨数学模型具有较高的可信性
Objective To establish a dynamic model of human cranio-maxillofacial skeletal system using modal analysis. Methods The fresh human cadaver skull was used as experimental model, and 37 measuring points were divided. Using the method of multi-point measurement of 1-point pulse excitation test technique, the skull was excited by the hammer, and the excitation and acceleration response curves were measured at the same time. Through the data acquisition instrument, the signal is sent to the workstation for transfer function analysis, the frequency response function matrix is established and the modal parameters of the system are obtained, then the dynamic equations of the cranio-maxillofacial skeleton system are established. Reciprocity and reliability testing of the model. Results The vibration of the cranial structure under the external load was dominated by the first-order modes. The first four modes were mainly distributed below 200 Hz, which were 31.48, 78.82, 140.98 and 0.260.67 Hz, respectively. Skull structure has good reciprocity. The theoretical transfer function curve and the actual transfer function curve calculated by the mathematical model can be well matched. Conclusion The modal analysis method provides important information for studying the dynamic response and damage mechanism of human body under impact load. The mathematical model of skull established by modal test method has high credibility