Design Optimization And Performance Evaluation Of Lower Limb Passive Assist Exoskeleton Based On User Experience

With the continuous development of sports in our country,people pay more and more attention to sports injuries.The passive exoskeleton can effectively enhance the human body’s ability to move.It is widely used in the military field,outdoor sports,and industrial applications.It can effectively prevent sports injuries caused by muscle fatigue and excessive joint load.It has a very broad application prospect.From the perspective of user experience,this study proposes a new type of passive lower limb wearable exoskeleton based on the movement rules of human lower limbs and evaluates its effectiveness.First,the target user group is determined,and the characteristics,usage scenarios,user pain points,and user needs of the target user group are analyzed,and user demand indicators are created based on the characteristics of the passive lower limb exoskeleton product.Based on the Kano model,relevant questionnaires were developed to conduct user surveys and quantitative and qualitative analyzes on the attributes of demand indicators,and based on them,a design optimization strategy for lower extremity passive exoskeletons was proposed.Based on the existing power assistance principle,an optimized power assistance principle is then proposed,which replaces the connection point of the inherently elastic element with the deflection pulley from the point of view of improving the human-machine coupling.It can control the energy storage and release of the elastic element in coordination with the movement of the human body during the movement of the human body.At the same time,based on the geometric relationship of the support structure of the lower extremity exoskeleton,the relevant structural parameters are designed and optimized.Based on the virtual prototype simulation technology,verify the mechanical strength of key components and optimize the design,and verify the correspondence between the lower limb passive exoskeleton and the human body motion state.Then,based on the structural design of the lower limb exoskeleton and the functional characteristics of the product,the passive lower limb exoskeleton was designed and positioned,the shape,color,material and structural size of the passive lower limb exoskeleton were determined,and that Sketch scheme has been executed.Evaluate the sketch scheme in terms of modeling style,comfort and workability,and select the optimal scheme for indented design,further design its 3D model,and render the product effect.The parts are then processed and customized on the basis of the 3D model and the production of functional prototypes is complete.Finally,the prototype of the passive lower extremity exoskeleton was tested and evaluated from the two dimensions bioengineering and user experience.Based on the EMG signal evaluation method of testing the effects of wearing an exoskeleton on the muscles of the lower limbs of the human body,it was proved that wearing the lower limb exoskeleton for squat exercise can effectively reduce the integral EMG value of i EMG by 36.14 % and walking exercises can effectively reduce the integral EMG value of i EMG.The value is 50.94%.Based on user experience theory and fuzzy analysis hierarchy process,the user experience of passive lower extremity exoskeleton is tested and evaluated.Based on the related theory of AHP,this research constructs the user experience evaluation system of the lower limb passive exoskeleton,and based on the fuzzy comprehensive evaluation method,designs the subjective evaluation scale of the user experience,and conducts the user experience evaluation experiment of the lower limb passive exoskeleton and related research results.Experimental data collection.The overall user experience score of the optimized lower extremity exoskeleton prototype is 3.542,the appearance adaptability score is 3.711,the working fluidity score is 3.313,the human-machine interface score is 3.391,and the assisting efficiency score 3,694.The user experience has been significantly improved,and the overall experience rating is good.This study innovatively designed a motor-assisted exoskeleton with a roller chute as the elastic element connection point,broadening the thinking for research on passive lower-limb exoskeletons and providing a reference for subsequent structural innovation design in related fields.Based on the user experience,this study proposes an optimization strategy for the design of passive lower limb exoskeletons and creates a model to evaluate the user experience for passive lower limb exoskeletons based on a fuzzy analysis hierarchy process.The Exoskeleton User Experience Evaluation and Optimization source provides a reference.