Development Of Tight-fitting Clothing For Sensor Positioning

Wearable sensing clothing can monitor the physiological and physical signals of the human body in real-time.Stable and real-time monitoring signals are of great significance in disease prevention,rehabilitation training of patients,daily training of athletes,and other fields.In the process of movement,there will be slippage and gap between the human body and the sensing clothing,resulting in inaccurate monitoring data.Therefore,it is necessary to develop sensing clothing with better followability between the sensing module and the human body.Some scholars have found that the causes of slip between clothing and the human body are related to the surface curvature of the human body,the tensile property of the fabric,and the style structure of clothing.Based on the above three influencing factors,the method of numerical simulation and specific experimental verification are used to design and produce tight-sensing clothing.The research contents are as follows:(1)The stretching and changing rate of the skin of the upper body of the human body was measured experimentally.The skin grid marking method was used to draw horizontal and longitudinal marking lines on the upper body of the human body to form the body surface grid.The state of running the human body was selected as the movement posture.The soft ruler was used to measure the size of the marked line segment under static and dynamic posture,and the skin extension and change rate of each area was calculated by the formula.The results showed that the skin deformation was more obvious in the front and back parts of the human body below the scapula,while the skin deformation was lower in the side parts of the human body.The results provide a reference for clothing optimization design.(2)Establish the finite element model of clothing wearing.The method of numerical simulation was used to optimize the clothing design.Firstly,the model of the upper body of the human body was created using reverse engineering software Geomagic Studio.On this basis,the initial contour model of the clothing was obtained from the clothing design software Marvelous Designer.Similarly,the sleeveless tight clothing model was built using Geomagic Studio.Secondly,according to the skin deformation range of each region and the tight clothing style structure on the market,the sleeveless tight clothing was cut and designed in pieces.The finite element analysis platform of ANSYS Workbench was used to study the position change of the sensing module assembly point relative to human skin when different elastic fabrics were combined into clothing.The results show that before the optimization design,the slip range of clothing in the x direction is 0.556 mm～0.851 mm and 0.591 mm～0.936 mm under different postures.After the optimized design,the slippage distance in the x direction is reduced to 0.212 mm and 0.225 mm under different postures.(3)Build a sensing clothing signal acquisition platform.To further verify the results of numerical simulation analysis,a sensing clothing signal acquisition platform was built in this paper,which was used to collect the acceleration signals of the human body in the running state,and the collected signals were processed by quadratic integration and filtering to obtain the corresponding displacement signals.The results showed that the displacement signal collected by the optimized sensing clothing was closer to the signal collected in the nude state.The feasibility,effectiveness,and practicability of zoning design for sensing clothing are further verified.