站姿人体与轻质结构水平耦合振动单自由度等效模型参数研究

摘要

给出了一种通过实验获得人与轻质结构水平耦合振动单自由度等效模型参数的方法。首先采用单自由度振动台对人与结构水平方向耦合自由振动位移时程进行测试，然后在推导出振动台水平振动阻尼比计算公式的基础上通过最小二乘法拟合得出人体等效自振频率和等效阻尼比。测试中考虑了人体正面与振动方向夹角分别为0度、45度和90度三种状态以及有无抓握扶手对测试结果的影响。分析结果表明，在结构/人体质量比约为0.25时人体等效自振频率在0.1 Hz～0.48Hz，等效阻尼比在0.05～0.39之间变化，当人双手抓握扶手时等效自振频率和等效阻尼比最大。%A method to identify the parameters of an equivalent single-DOF horizontal vibration model for a standing human body coupling with light structures is provided.A single DOF test rig is used to test the horizontal free vibration time-history of human body- structure interaction. The damping ratio of the rig is estimated. Least square method is applied to identify the equivalent human body free vibration frequencies and the damping ratios. The influencing factors such as human body orientations including 0, 45, and 90 degrees and gesture of grasping handrail are considered. The result shows that the equivalent frequencies of the human body vary from 0.1 to 0.48 Hz and the damping ratios vary from 0.05 to 0.39 when the mass ratio of the structure to the human body is nearly 0.25. It also shows that the posture of grasping handrail yields the maximum equivalent free vibration frequency and damping ratio of the human body.