Parameter Acquisition And Analysis System For Freestyle Skiing Aerials

The rapid development of modern science and technology affects people's lives in all aspects, and also promotes the development of sports science greatly. The trend of sports training is gradually to digital, information technology and scientific, and the pressing issue facing sport scientists is how to analyze and evaluate the movements of athletes fast, accurately, qualitatively and quantitatively.At present, there are a lot of advanced equipments applied in physical training, such as force platform, digital shot and digital runway etc, which are developed by Institute of Intelligent Machines, Chinese Academy of Sciences. Due to the application of these equipments, greatly improve the efficiency of athletes of training, and physical training from the traditional to the trend of scientific irreversible transformation. As restriction of Aerial Site, many types of equipment cannot be applied on this sports project and the commonly used equipment is the video analysis system at home and abroad. The video analysis system is too expensive to promote in Physical Education, but the main inadequate of this system is that the system resolution process for a long time and cannot provides the parameter data on the shot.This paper is based on the State Sports General Administration project"Balance Control Mechanism of Body Movement and its Application Research in skiing,"and we design a system for obtaining movement parameters of freestyle skiing aerials with Shenyang Institute of Physical Education. The system can overcome the shortcoming of video analysis system and provide a platform for sports training to help coaches guide athlete training scientifically, which can improve training efficiency, in order to enhance the competitiveness of freestyle skiing aerials in the international.The main contents of this paper are divided into the following sections:1. Selection of the sensor for the parameters acquisition. MTi can output high accuracy of three dimensional acceleration and angular velocity, and the attitude angle is corrected by the Kalman Filter algorithm. MTi is a high performance inertial navigation measurement products.2. The establishment of the hardware platform for freestyle skiing aerial. As the aerials features and the user needs, the system consists of four parts, the controller chip of which is C8051F020. Sm-45 wireless data transmission module is applied for module communication, large quantities of data is lost under wireless module long distance transmission, motion parameters not suitable for real-time transmission, so the parameter information should be saved in data storage module AT45DB081.3. Signal processing algorithm Research. As the parameter outputted by the sensor directly contains acceleration and angular velocity, we can get speed, angle and angular acceleration by numerical integration and differentiation.4. Establish database stored movement parameters. There are many advantages for database technology; such as reduce data redundancy, improve data integrity and consistency, etc. so use database store movement can make data and application separate, which can expand system easily.5. At the end of this paper, we describe two experiments, one is a car declines along the slope, and the other is freestyle skiing movement. From the experiments, we can verify the function of the system. Finally, give work summary and prospect. ?...