Human Kinetics Of Jumps In Figure Skating

Figure skating development up to now,the Western athletes have been occupied the absolute advantage.Since its inception,the Chinese figure skating team has been striving to catch up and make breakthroughs.However,in recent years,the performance of Chinese athletes in the world has not continued,and there has been a talent gap.How to improve the technical level of young athletes has become the top priority for the Chinese figure skating team.Now the athletes level of progress,more and more need the intervention of sports science,the human body dynamics is from the Angle of mechanics to analyze the complex human body system,this paper,by using motion capture system of six basic jumps in figure skating test records,try to quantitative evaluation for figure skating technique;Dynamics modeling and simulation calculation were carried out for the human body,and the motion law and the stress condition of the lower limbs were analyzed and studied,including:Firstly,based on human anatomy knowledge,this paper briefly studies the function,coordination mechanism and physical characteristics of muscles,joints and bones related to figure skating.According to the theory of multi-body dynamics,the combination of figure skating movement model,to simplify the body’s bone structure for 17 multi-rigid-body model consisting of a rigid body given in figure skating movement joint degrees of freedom is different,with the rotating hinge,universal joint,and instead of globe hinge joints of the body,with a hinge on different rigid connection,the multi-rigid-body system with 25 degrees of freedom,For the joints with a small range of motion,their motion is ignored,such as: The generalized coordinates are fixed as 0 without considering the flexion and extension of the wrist,adduction and abduction,and flexion and extension of the toe joints,and the muscles are simplified as torque controllers acting on the joints.Since the muscles of the lower body determine the quality of the movements,only the muscle model is built in the lower body to reduce the difficulty of simulation.Thus,the geometric model of figure skaters is established by using human dynamics simulation software Open Sim.Then the dynamics model of figure skaters is carried out.The numerical calculation methods of kinematic parameters such as direction cosine matrix,centroid velocity and angular velocity,centroid acceleration and dynamic parameters such as force element and virtual power related to the multi-rigid body system are described and derived in detail.The friction and air resistance of human body are analyzed and estimated in detail.Finally,the inverse dynamics problem of human body system is solved by simulation.To software environment,the movement of data is obtained by the inertia motion capture system to calculate the athlete to complete six basic jumps,the Angle of the hip,knee,ankle,according to the requirements of the different actions technology,technique for the quantitative evaluation,calculate the real athletes air rotating Angle,athletes in figure skating jumps for the dynamic simulation,The torques of human hip joint,knee joint and ankle joint in jumping movement are obtained.