Design Of A Passive Half Squat Posture Assistive Stabilizer Based On Anatomy And Biomechanics

In the industrial production process,standing posture is the best posture for working.However,workers usually feel fatigue and uncomfortable after standing for a long time,which causes occupational musculoskeletal disorders.According to the 2014 annual report of the U.S.Bureau of Labor Statistics,WMSDs account for about 32%of work-related injuries and occupational diseases,resulting in billions of dollars in economic losses per year.Reducing risk of occupational musculoskeletal disorders is an international challenge for the occupational safety and health field.Through the study of the skeletal muscle activation and the vulnerability of the lower limbs in the standing posture,it is found that standing for a long time will cause great pressure on the knee joint,make the soleus muscle,gastrocnemius muscle and lateral femoral muscle fatigue.However,these problems will not arise in the sitting posture.Therefore,this paper hope to design a lower limb exoskeleton that allows users to "sit" anytime and anywhere without affecting users’ normal actions.The research process of this paper is as follows:1.Make direction of developing the lower limb assistive stabilizer clearly by researching.The author did some anatomical and biomechanical research on the lower limbs of the human body,combined with research on related patents,and went through some divergent thinking.The best way to meet the needs of "sitting at any time"is to use a passive lower extremity exoskeleton with mechanical limit structure.When a user walks with a stabilizer,the stabilizer won’ t affect the user’ s normal actions.When the user squats to a certain angle,the stabilizer forms a rigid connection through its own mechanical structure and supports the user to maintain sitting posture.2.Conduct product design of the lower limb assistive stabilizer with structure and function design.We propose a complete design,including the basic mechanical structure design which implements the product’ s function,the industrial design which expresses the product’ s emotion,the Ⅵ design which makes the product a brand.During the design process,the product structure strength,angle limit range,ergonomics design and other aspects were discussed in depth.The finally presented stabilizer is a productized product with reasonable functions.3.Carry out design verification of the lower limb assistive stabilizer,and put forward some design derivative thinking.A large number of design verification experiments have been done on the lower limb assistive stabilizer in this article,verified the actual effect of the prototype from the aspects of product function,human-computer interaction experience and product efficacy,and we think it achieves its preset functions.30 samples were collected for comfort analysis,so the results are statistically significant.Also,in-depth analysis of the data collected during the experimental process has been conducted,.and proposed deepening design thinking from the per spectives of design and security,design and environment,design and derivative,which proposes the direction for the project’ s following developments.