人体-结构系统静态耦合的模态参数

Modal parameters of human body-structure static interaction systems

静态人体与结构之间的相互作用称为人体-结构系统的静态耦合。通过建立人体-结构系统的静态耦合运动方程,确定了系统的质量矩阵、刚度矩阵、阻尼矩阵。采用状态空间法求解其特征方程,得到了系统的频率和阻尼比,研究了人体与结构的质量比、频率比、阻尼比、人位于结构上的位置等参数对系统动力特性的影响。结果表明:人体既可以降低结构的频率,也会增加结构的频率;同时,人体既可以增加结构的阻尼,也会降低结构的阻尼;影响人体-结构系统频率的主要因素是人与结构的质量比、频率比、人位于结构上的位置,而人体的阻尼比对频率的影响较小。最后,通过简支梁振动试验,验证了分析模型的正确性。试验表明,不同姿态下的人体具有不同的动力特性,其对结构动力特性的影响也不同。

The equations governing human body-structure static interaction were derived.The matrixes of mass,stiffness and damping of the system were defined from these equations.Then,the modal frequencies and damping ratios of the system were solved by using the state-space method.On this basis,the influences of the ratios regarding mass,frequency and damping coefficients between human body and structure and the body location in the structure on the dynamic characteristics of the system were studied.The result shows that human body may reduce,and sometimes may increase the frequency of the structure.The main factors affecting the dynamic characteristics of the system are the ratios regarding mass and frequency between human body and structure as well as the body location.The damping of body has little effect on the dynamic characteristics of the system.A vibration test was carried out to verify the human body-structure interaction.The test shows that different body postures have different effects on the system.