The Study Of Establishment And Application Of Skater-skateboard Multi-body Dynamic Model

Skateboarding has been established as an official event of the Olympic Games by the International Olympic Committee with the continuous improvement of the Olympic system.The state vigorously advocates national fitness,and the public's participation in sports is increasing.Nowadays,sports equipment is becoming more and more scientific and intelligent.The competition in the Olympic Games is the competition of the whole scientific and technological team behind the athletes.However,there is little academic research on skateboard at home and abroad,and there is still a blank in China.Therefore,skateboard sports training and equipment design need a scientific theoretical basis.The main work of this paper is as follows:(1)The connect of human body between skateboard was discussed and the global and local 12 degrees of freedom of the skater-skateboard system are determined based on existing simplified models of skateboard and multi-body dynamics theory.The lateral and longitudinal slope angles of the skateboard were proposed.The multi-body dynamic model of skateboard with human body was constructed.(2)Some characteristic parameters of human body and skateboard were measured.The typical horizontal and slope conditions of the model were studied.In the slope experiment,there was no acceleration section in the predetermined trajectory.In order to obtain the slope angle on the predetermined trajectory,four track were divided,and the slope angle of the trajectory was calculated by the slope angle of the track.(3)Some experimental data were used as the input of the model,the velocity and displacement calculated by other data were compared with the results calculated by theoretical model.The average errors were less than 10%except the Individual parameters.The established dynamic model can describe the detailed structural parameters of the skater-skateboard system and the motion law of each degree of freedom,which is helpful to understand the essence of skateboard.(4)The application of human movement and skateboard design were analyzed based on the established model.The correlation between human body,skateboard and movement parameters and human body tilt angle was determined,and the correlation between wheel diameter,wheel distance,axle cantilever length,deck tilt radius and minimum turning radius was determined.In this paper,the experimental method was used to verify the theory,a skater-skateboard multi-body dynamic model was proposed,which is suitable for skating on slope and horizontal ground.Based on the quantitative relationship between the body mass,height of centroid and the athlete's body characteristics analyzed by the model,the optimization suggestions of the body tilt angle can be given.According to the analysis of the turning radius and the deck tilt angle,the optimization and classification of the truck pivot angle and the wheelbase are helpful to the standardization of the skateboard parameters and specification.