Kinematic Analysis Of Chinese Classical Dance String Turning Over Technique

Objective: Through 8 lens high-speed infrared motion analysis(USA,200Hz).Through the analysis of the index,the kinematic parameters of the roll over technique of the Chinese classical dance strings of the excellent dancers are obtained.The comparison between the roll over technique of the Chinese dance students of Beijing Sport University and the excellent dancers is made to find out the gap between them.Combined with the relevant literature and action essentials,the paper points out that Analysis of the reasons,to provide a theoretical basis for future technological improvement.Methods: The 8-lens high-speed infrared motion capture system(motion analysis,USA,200Hz)is used to collect the roll over movement of excellent dancers and Chinese dance students.The change of gravity center and the Euler angle and angular velocity of hip,knee and shoulder joints are calculated by cortex software.Using origin to standardize and Excel to calculate the mean value,the differences of kinematic parameters between excellent dancers and Chinese dance students in an action cycle were compared.Result: 1.The average time of excellent dancers in each stage is 0.57 s,and that of special students is 0.61-0.66 s,0.04-0.09 s more than that of excellent dancers.Among the special students,one of the subjects took a long time,with an average of0.75 s in each stage,0.17 s longer than the excellent dancers.2.The average standard deviation of excellent dancers is only 0.005 s,and the average standard deviation of special students in each stage is between 0.015-0.020 s.Only one special student is quite different from the excellent dancers and their subjects,the standard deviation is0.051 s,and the standard deviation is 0.046 s.3.In the middle three movement stages,it is not affected by the start and end of the movement.The variation curve of the horizontal direction and the front and back direction of the center of gravity of excellent dancers is less than that of the special students,and the variation trend period of the vertical direction is obvious,and the peak value is the largest.4.Excellent dancers in all subjects,hip joint angle change is the smallest;knee joint angle change is large,and the peak value is the largest;shoulder joint angle change is also the largest,the peak value appears later than other subjects.Conclusion: 1.Excellent dancers have a short start-up time of turning over technique of Chinese classical dance strings,smooth links in all stages,good coordination ability and strength quality of dancers,and tight and concentrated force.If the action quality is not good,the time is longer,and there is a big difference in each stage.The standard deviation of each stage of the high-quality tumbling action is very small,which shows that the action quality tends to be stable,less affected by the external environment,and the action forms automation.2.The change trend of the barycenter of high-quality tumbling technique in the horizontal direction should be almost straight-line;the smaller the fluctuation range of the curve in the front and back directions is,the movement barycenter is always in a controllable and stable state;the obvious periodic change trend of the barycenter in the vertical direction indicates that the more stable the barycenter is,the stronger the body’s coordination control ability and body control ability.3.In the process of tumbling,the greater the change of joint angle,the greater the peak value,the greater the action range and the higher the action quality.Among them,the angle of the left and right knee joint and the angle of the left and right shoulder joint have the opposite trend.4.In the process of turning over,the lower the fluctuation of the head point in the front and back direction,the higher the quality;in the vertical direction,the regular fluctuation trend.5.In the process of tumbling,students are prone to a series of problems in the control of the center of gravity.In the front and back direction,it is too slow to enter into the stable stage of the tumbling of the string,and the quality of the weekly movement connection of the tumbling is poor;in the vertical direction,the periodic change of the center of gravity is not obvious enough,which means that the height of the jumping of the tumbling string feet is not good when they alternate.