Construction And Research Of A Comprehensive Mechanical Model For Human Gait Stability

Walking as a movement must be occurred in the daily life,the body’s unique internal adjustment mechanism can make the steady walking and gait instability.Gait instability cause a great impact to our life,so it is particularly important to research on human gait stability.In this paper,10 young male subjects were tested using three dimensional infrared motion capture system,force plate system and sEMG measurement system.The experimental environment was a straight trail.In the experiment,each subject was required to walk on the left and right step to walk steadily,and the gait information was collected and processed.Using AnyBody simulation analysis of human gait,the results were combined with the simplified muscle mechanics model of lower limb six rod and five degree of freedom.The quantitative analysis of the muscle force in the lower limb during stable gait was made.The conclusions are as follows.Joint torque and joint angle are combined and the gait cycle is divided into two phases:the supporting phase and the swinging phase.The movement of the hip,knee and ankle joints of lower extremities in the sagittal,frontal and horizontal plane during the straight walking are analyzed and compared in detail.The muscles acting on the foot,the soleus muscle force in the supporting phase is the most significant,followed by the gastrocnemius muscle,and the tibialis anterior muscle is the weakest,and the force of the three supporting phases is stronger than that of the swing phase.The maximal force sequence is soleus muscle>gastrocnemius muscle>tibialis anterior muscle,which is consistent with the force of the three in the whole gait cycle,and the average force is consistent with the maximum force.The three forces acting on the calf muscles are basically the same in the supporting phase.The quadriceps femoris in the swing phase is the strongest,and the musculi biceps femoris is the second,and the tibialis anterior muscle is the weakest.The maximal force sequence is quadriceps femoris>tibialis anterior muscle>musculi biceps femoris,the tibialis anterior muscle and musculi biceps femoris have little difference.The average force order is musculi biceps femoris>quadriceps femoris>tibialis anterior muscle,and the gap between the three is relatively small.In the muscles of the thigh,the force of the middle gluteal muscle in the supporting phase is the most significant,which is quite different from the other muscles,and the remaining muscles are relatively weak.In the swing phase,the force of the gluteus medius and quadriceps femoris is more significant and fluctuated,and the remaining muscle force is more stable and almost the same trend.The maximum force sequence is medius gluteus muscle>quadriceps femoris>gluteus maximus>semitendinosus>musculi biceps femoris.The difference between the middle gluteal muscle and the remaining four are large.The musculi biceps femoris,semitendinosus and gluteus maximus are equal,and the average force is similar to the maximum force.The kinematics and dynamics of human gait stability research and quantitative analysis,the results for the rehabilitation of the disabled limb research,intelligent prosthesis production,lower limb walking aid device research and development as well as the field of sports and medical field and other fields provide theoretical support and reference value.