Research On Surface Modeling Design Method Of Foot Related Products

For the user,products need to meet not only practicality but also matching,comfort,and aesthetic needs.Most of the existing foot-related products on the market are massproduced and do not perfectly match the curved shape of the human body,with a focus on functionality at the expense of user comfort.Customized designs of wearable products based on the curved shape of the human body have a high degree of fit and wearability but are expensive and complex to design.How to meet the user’s comfort needs and improve the efficiency of custom design has been a very important research direction in the field of industrial design and human factors design.Firstly,the 3D foot models of 400 Chinese young people were collected,the foot model pre-processing,the unified coordinate system and the measurement of foot feature dimensions were completed,and the differences in foot dimensions between males and females and between the two feet of the same person were compared and analysed,concluding that there are significant gender and individual differences in foot surface morphology.Secondly,based on the non-rigid iterative nearest point alignment algorithm,all the foot models are in the same coordinate system,and all the collected foot data are reconstructed into comparable models;based on the principal component analysis algorithm,the foot data are dimensionally reduced to construct a statistical foot shape model and a foot prediction model;the foot models are regressed with the principal component weighting vector as the dependent variable and the key foot feature size as the independent variable.The validity and reliability of the method were verified by error analysis.Further,using the ankle-foot orthosis as a typical foot product,a user requirement-oriented design process for the ankle-foot orthosis was proposed,in which each requirement was classified according to the Kano model to obtain a comprehensive score of the importance of the user requirement,and the user requirement was assigned to design elements according to the characteristics of the ankle-foot orthosis.Finally,the predicted 3D model of the patient’s foot was used to design and 3D print a lightweight ankle-foot orthosis,which was objectively verified for comfort.By analyzing the plantar pressure cloud map,pressure mean curve change,coronal angle change curve of the ankle joint,and foot force line graph when the patient wears the orthosis,the experimental results point out that the lightweight ankle-foot orthosis can not only improve the inversion of the patient’s foot,but also meet the user’s wearing comfort requirements.This thesis investigates a method of designing foot-related product surfaces using foot feature dimensions as input,foot surface alignment and reconstruction,and foot statistical shape model construction and prediction as technical means.Selected anklefoot orthoses as a typical product for user requirement acquisition,design and validation.The design method solves the problems of wearability and custom design efficiency of foot-related products.The results of the research are of great value to manufacturers and designers of footwear,foot-related medical products and foot sports protection.There are 64 figures,16 tables,and 99 references.