小腿冲击器动力学分析简化模型

针对行人与车辆碰撞中行人小腿的保护问题,建立基于MCKF模型和简单梁理论的新型小腿冲击器二维多体动力学模型.用柔性体模拟韧带以满足小腿冲击器对膝关节建模的较高精度要求；将不同阻尼系数和刚度系数引入多体模型以满足某些连接部位的阻尼和刚性要求.参考ECRNo.631/2009中的小腿冲击器动态试验并改进原始的刚性冲击锤的材...

Simplified dynamics analysis model of lower leg impactor

As to the protection of pedestrian leg during the impact of pedestrian and vehicle,a 2D multi-body dynamics model is established based on MCKF model and simple beam theory.Flexible body is used to simulate ligaments to meet the high precision of knee joint modeling required by lower leg impactor;the different damping coefficients and stiffness coefficients are introduced into multi-body model to meet the damping and rigid requirements of some joints.The material of original rigid hammer is improved by making reference of the tests in ECE No.631/2009,and the MCKF model are compared with the model established by LSTC corporation.The comparison results indicate that the acceleration,bending angle,and shear displacement can be accurately predicted by the MCKF model,and the trend of EA curve is similar to the one of LSTC model.The MCKF model can provide references for designers to implement the prophase development of vehicle foreside structure.