Research On The Dynamic Testing System Of The Gravity Center Of Human Body

The gravity center of human body is one of the basic segment inertia parameters reflecting the structure of configuration and character of mass distribution of human body, which can offer references in the medical rehabilitation and the sports activity. Therefore, the study of the gravity center is of importance in both learning and application.This subject stems from the project of the research on the portable dynamic testing system of gravity center of human body supported by the NSFC. The research of this subject not only can enrich the dynamic testing theory of the human gravity center in theory, but also can provide a simple, rapid and accurate method to realize the dynamic measurement for human gravity center in practice. A convenient testing system for the human gravity center is offered at last, which can be used in the following fields, such as the sports teaching, training and scientific research, the nationwide fitness programs and the medical rehabilitation.In this paper, the testing theory is discussed firstly and the coordinate equations of the gravity center are deduced according to the moment balance theory. Then design a new four-fulcrum testing platform, in which the special weight sensor is replaced for the conventional balance or electric balance to improve the measurement precision. And software is developed, which can complete the data acquisition, graph display, data storage, query and procession. In the signal analysis part, an AR model for power spectrum estimation is setup, and by examining the percent of the frequency region in the whole power spectrum to conclude the damaging system and part. At last, two group experiments are given, the results indicate that this testing system has high precision and popular prospect.