对滚翻落地缓冲运动对膝盖冲击力影响进行准确分析,可以减少运动员受伤的概率.进行力学分析时,需要对膝盖和下肢各关节的受力情况进行分析计算,而传统方法是通过对局部膝关节受力进行计算建立滚翻落地缓冲运动对膝盖冲击力分析模型,未考虑膝盖和下肢各关节的受力情况,导致计算精度低.提出采用下肢分析的滚翻落地缓冲运动对膝盖冲击力影响建模方法,依据人体下肢受力状态建立足部和小腿的受力控制方程,通过方程对踝关节受力和膝关节受力在各平面的分力进行计算,给出膝盖正常状态下的受力模型.在分析滚翻落地缓冲运动下膝盖所受冲击力受力基础上,给出缓冲力作用在左膝盖和右膝盖的冲击力力矩,采用Lagrange动力学方程得到滚翻落地缓冲运动对膝盖冲击力的驱动力矩,完成对滚翻落地缓冲运动下膝盖所受冲击力模型的建立.仿真结果表明,采用所提冲击力分析模型,对膝盖冲击力的受力分析值和理论值更加接近,计算精度较高.%A modeling method is proposed for effect of rolled landing and buffering motion on knee impact force by using lower limb analysis.The force control function of foot and crus is built according to the force state of lower limp.Then the each planar component force of ankle joint force and knee joint force is calculated through function,and the force modeling of knee under normal state is obtained.The impact force moment of both knees affected by buffering force is given based on analyzing impact force of knee under rolled landing and buffering motion.The impact driving moment is obtained by using the Lagrange kinetic equation.Finally,the model for effect of rolled landing and buffering motion on knee impact force is built.The simulation results show that the force analysis value of impact force is close to the theoretical value by using the proposed model.It has high calculation precision.
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