Movement Between Different Shoes - The Role Of Surface Friction Characteristics Biomechanical Analysis

Objective:This paper is designed to put a research on the friction characteristics between different shoes and surfaces in movement by testing the coefficient of friction and other relative parameters,in order to comparing the friction characteristics of different shoes and explore a biomechanical method on evaluating footwear friction characteristics.It's is also a reference for the shoe manufacturer in the kinetics terms and the experimental results provided are supposed to be the basis for the designing and relative researches on friction characteristics.Method:30 students without injury histories in different majors of Beijing Sport University were selected in the experiment,while five shoes in two different brands and four kinds of surfaces were used.They were:steel surface,plastic surface,wood and artificial grass surface. The students were asked to finish five motions while wearing different shoes on different surfaces respectively when using Kistler force platform and two high speed videos at the same time.Result:(1)Walk and run,coefficient of friction varies as a "S" curve, where a peak value appears at the moment of taking off and touching down and the second peak is the maximum coefficient of friction |CoFy|m; |CoFy|m of walking appears at about the last 10%time,while |CoFy|m of running appears at about the last 6%time.In 180 one-leg-turn-around action,|Mz| appears at the first 10%—20%time period.(2)|CoFy|m of walking varies from 0.406—0.589,while the maxium value appears in the C-type shoe and plastic surface test,and the minimum value appears in the A-type shoe and steal surface as well as E-type shoe and wood surface.|CoFy|m of running varies from 0.377—1.119,while the maxium value appears in the B-type shoe and artificial grass surface test, and the minimum value appears in the A-type shoe and wood surface,which indicates that |CoFy|m varies within a larger range in running than in walking. (3)In 180 one-leg-turn-around action,|Mz|varies from 13.12Nm to 31.18 Nm,of which the minimum value appears in the A-type shoe and wood test, while the maximum value in the C-type shoe and plastic surface.Among all the testing result,there are 4 conditions have |Mz| value larger than 25 Nm,which could cause damage during sports.(4) Surface has larger influce on the character of friction than shoes.(5) The distribution of |Mz| appears to be very different for both surface changing and shoes changing.This indicates shoes and surface both have big influence on resistance of rotation.(7) During walking and running Ty land |CoFy1| have a relationship of negative correlation,Ty2 and |CoFy2| have a relationship of positive correlation,and during 180 rotation TMz and |CoFy2| have a relationship of negative correlation...