The Study Of Gait And Muscle Characteristics For Lower Limb Muscle Recession Elderly Based On Human Boimechanics

Nowadays, China has become an aging society, with an increasing number of agingpopulation and empty-families that takes great influence on seniors’ life, health and medicaltreatment. People’s physical function gradually decline with the age growth, the mostobvious decline is muscle strength of lower limbs. Muscle strength of lower limbsmaintains the body’s normal posture and is a necessary condition for varieties of dailyactivities. Muscle strength of lower limbs decline is not only harmful to human walkingstability dramatic effect, but also leads to falls among the seniors, hip fractures, jointdislocation and other serious consequences of disability or death. So it is necessary to studygait and muscle characteristics of the elderly who are suffering muscle recession.In this thesis, muscle strength of lower limbs decline of the elderly is the researchobject, based on the anatomy, used Solidworks to build the skeleton model suits humananatomy structure and through ADAMS to study the elderly gait and muscle mechanicalcharacteristics. This study will have a good theoretical and practical significance onmechanism falls for the elderly, rational planning and research for the elderly gait andwalking assist device.The following aspects illustrate this thesis.A human walking process multi-rigid-body dynamics model is established, andmulti-rigid-body dynamics equations is obtained. Through image acquisition and humaninertia parameters, it can calculate the body in walking joint torque of each joint withMatlab.A skeletal model of the human body which is in line with physiological characteristicsis established. ADAMS software is to motion control the human skeleton model, simulatesthe elderly in a walking gait cycle to draw the size of the human body joint torque. Thisresult is almost same as the data calculated by Matlab of joint torque size direction andverifies the correctness of the multi-body dynamics model. The experimental data showsthat the maximum hip joint torque is generated in walking and it’s the most important partof applying strength for anti-fall walking device. To provide additional torque to the elders’hip joint for compensating the insufficient torque of the elderly hip joint, it will be theworking principle of anti-fall prevention working device for the elders.Lower limbs muscles in the body model are established based on the linear theory ofmuscles. Based on ADAMS, it sets up human lower limbs9load-point muscles.According to the function of these muscles to be divided into five different muscle groups,it analyzes the mechanical properties of muscles in the ADAMS. It showed that thequadriceps muscle in maximum strength in walking, with the decay of muscle strength,muscle strength is only40%of normal muscle strength. In order to preventing the quadriceps muscle recession of the elderly fall, not only provide additional torque to the hip,but also add500N force at least in the quadriceps position along the vertical axis.