Design And Research On Passive Lower Extremity Exoskeleton Movement Aids

With the increasing popularity of mass sports,the number of sports enthusiasts such as hiking and running is growing.Due to incorrect exercise habits,the group of people suffering from exercise fatigue and injuries is increasing.The development of exoskeleton sports assistive products can enhance people’s exercise ability and improve the exercise efficiency of outdoor workers and soldiers,playing an important role in reducing the probability of lower limb exercise fatigue and injury.This article proposes a passive flexible assistive exoskeleton sports device based on the human body’s multiple motion gaits,aiming to provide auxiliary force for the human lower limbs through energy recovery and elastic energy release,thereby reducing exercise metabolism and minimizing exercise injury.Firstly,the article surveyed the background and causes of exercise injuries and the background of exercise assistive devices,and summarized the current situation of passive assistive exoskeleton and flexible assistive exoskeleton research at home and abroad.Secondly,based on the target user group,user questionnaires and interviews were conducted to extract user needs and prioritize their importance,and demand analysis and user feature analysis were carried out based on the Kano model.Thirdly,the human lower limb movement structure,related range and dimensions of movement were studied,and the characteristics of multiple motion gaits in the human body were analyzed and compared.The energy conversion principle under different gaits was analyzed based on the biomechanical characteristics of human motion.A new passive flexible assistive method was proposed based on the energy conversion principle of the human motion gait cycle.Exoskeleton structure design was carried out based on the principle of exoskeleton assistance,and Ansys simulation was used to optimize the structure strength and lightweight design.Then,based on the user needs and functional requirements,design factor analysis of the exoskeleton sports device was carried out,and the design positioning of each factor was determined.Sketch design solutions and evaluation of the design schemes were carried out.After refining the design scheme,the product modeling and rendering were carried out,and a prototype was made for wearing testing.Finally,surface electromyographic biometrics testing was carried out using the product prototype.The experimental results showed that the exoskeleton sports device can effectively reduce the muscle metabolism level during human motion.UEQ user experience model was used for user experience testing and evaluation,and the evaluation results showed that the exoskeleton product was rated higher than the average level in terms of attractiveness,efficiency,novelty,promotion,and reliability.Based on the evaluation results,the direction of product experience optimization was proposed.This study innovatively designed a lightweight assistive exoskeleton based on the natural gait of the human body,which achieves passive assistance based on the natural gait of the human body.It can effectively reduce the muscle metabolism level during human motion and provide a reference for the exploration of passive assistance principle and structural appearance design practice of flexible exoskeleton products.