Su Benyue

The Motion Simulation for Freestyle Skiing Aerials

In order to simulate the angular velocity, acceleration and other kinematic parameters during the training timely for the ski athletes, we design a three-dimensional motion simulation system based on the gesture information acquisition system, which can help team coach to analyze the action and guide the team members training with the given purpose. Since it is difficult to get the accurate position parameter of the ski athlete, we integrate the ski field and physical information. The gesture information acquisition system can gain the parameter information of three-dimensional acceleration and angular velocity, which are recorded by the sensor. In this paper, we construct a three-dimensional motion simulation system to achieve the parameters of velocity, angular acceleration and angle at any time. The three-dimensional motion simulation system for freestyle skiing aerials is constructed in the OpenGL environment, and can observe the effects of posture demonstration from different views. Simulation results show that this system can record the movement information accurately and help athlete obtaining the training targets.

Sports biomechanics infomation acquisition and analysis based on Miniature Inertial Measurement

To fully evaluate the quality of movement the athlete performed, sports biomechanics information acquisition and analysis at barycenter is conducted based on Miniature Inertial Measurement Unit. The methods to acquire accurate speed, key point identification and index of redundant movement of the subject are proposed. Key point detection is realized by cascaded logical analysis. Velocity estimation is derived by approximate equation. Gesture Energy index is proposed which provides quantity clue for distinguishing of sports quality based on angular velocity record from Miniature Inertial Measurement Unit corresponding to key point. Experiments of measurements on athletes are done to prove the validation of the methods put forward. The velocity results of approximate equation are comparable to the results of video analysis. Phase identification procedure and Gesture Energy index are also proven to be practicable. The methods could offer some aided information to coaches in daily training.