气囊囊压对作训裤膝部防护性能的影响研究.

Military training injury is a kind of occupational injury caused by military training. According to the research survey the incidence of military training injury in our army is between 15% and 18. 7% . At present the prevention and treatment of military training injury is a hot topic in the military field. As special clothing worn by soldiers in combat or training military uniforms not only adapt to combat training activities but also meet certain protective needs. According to the vulnerable parts in the training more precise protection is needed. Several studies have shown that military training injuries are mainly concentrated in the upper and lower limbs and trunk and the knee joint is the main injury site in the lower limbs. Therefore the protection of the knee joint can reduce the injuries caused by training movements and training environment and is conducive to the protection of the physical health of the trainers. As a kind of protective material the airbag can realize the function of cushioning and absorbing energy through the air in the bag or other media. For knee joint injury in military training the airbag can be combined with training clothing. The buffering performance of the airbag is directly related to the pressure in the airbag. However according to previous studies there is not a simple linear relationship between the airbag pressure and the buffering effect. When a certain limit value is exceeded the buffering effect may weaken with the increase of the airbag pressure. In this paper we carried out the embedded design of the knee airbag protective cushion of training pants and explored the relationship between the airbag pressure and the buffer effect so as to determine the best airbag pressure of protection effect. Firstly starting from the training movements that are easy to lead to lower limb injury we selected the movements such as creeping forward and lying down pasted the film pressure sensor on the subject􀆶 s knee force position and finally obtained the pressure value during each movement through the serial port software. After the maximum pressure peak in each action was obtained the pressure was difficult to control accurately in the actual experiment and involved a wide range of sac pressure and many training actions. Therefore the ABAQUS simulation software was used to directly apply the pressure to the surface of the established balloon model so as to explore the deformation effect of the balloon under different sac pressures. At the same time we took the minimum external force work as an index to evaluate the buffering effect and carried out the principal effect test and the single factor analysis of variance to judge the relationship between the airbag pressure and the minimum external force work under different movements. The results show that there is a significant correlation between the pressure of the airbag and the minimum external force work. When the pressure of the airbag increases the minimum external force work gradually decreases and the buffering performance is gradually enhanced. However when the pressure of the airbag reaches a certain value the minimum external force work increases. And the airbag pressure can be divided into three categories. When the airbag pressure is 50 kPa the minimum external work average is the lowest and the buffer performance is the best. By combining the pressure measurement of the thin film pressure sensor with the simulation software we quantify the relationship between the bag pressure and the cushioning effect which provides some enlightenment for the analysis of the relationship between the bag and the cushioning performance. At the same time the airbag protective pad is combined with the training pants in the embedded way so as to provide help for reducing the injury in the training and provide certain reference value for the design of the knee airbag protective pad in the training pants. [ABSTRACT FROM AUTHOR]