多腔立体基布填充保暖性的有限元分析与验证OA

Regarding the fixing method of the filling of down products,quilting or hot rolling is generally adopted to combine the inner and outer layers of high-density fabrics to form a flocculent filling cavity.After filling with down,there will be a small amount of down filling near the quilting line or hot rolling point,and the thickness difference with other filling parts is big,or even only the inner and outer layers of fabric without down,which will have an impact on the overall warmth of the down products.In the vicinity of the quilting line or hot rolling point of a down product,where the filling density is small,the thickness difference with other filling parts is large,and there exists a warmth-retaining weak link.To address the above defects,a multi-chamber quilting-free three-dimensional filling base fabric was developed using multi-layer weaving.The filling cavities,arranged alternately along the warp direction,can enhance filling uniformity,and eliminate thermal weaknesses. The filling cavity width,and filling density were selected as the influencing factors of filling thermal insulation performance.Down filling samples were made with different filling cavity widths and different filling densities.A three-dimensional model of"skin-down-filling base fabric"was constructed using SolidWorks.The finite element thermal analysis module of ANSYS Workbench was utilized to simulate and analyze heat transfer for models with varying cavity widths and filling densities.The results obtained from simulation were analyzed and compared with experimental data to validate the model's accuracy. The results show that the staggered arrangement of filling cavities of this multi-chambered non-quilted filling base fabric can improve the filling uniformity and warmth retention.The down-filled samples have uniform heat transfer in the X-axis direction(the direction of the staggered arrangement of cavities),without the uneven heat transfer phenomenon caused by the filling defects of conventional quilting or hot-rolled structures;at the same filling density,thermal insulation performance improves as the width of the filling cavity increases,since a greater volume of stationary air is retained within the cavity.The simulation solution results of the finite element heat transfer model are in good agreement with the experimental results with an error of 3.53％,which has high prediction accuracy and important guiding significance.The model can be used for the subsequent improvement research of quilt-free multi-chamber three-dimensional filling base fabric,which can greatly shorten the experimental time,improve the efficiency,reduce the cost and simplify the production process.By presetting the base fabric material parameters,the thermal insulation properties of products with varying cavity sizes and down fill quantities can be rapidly predicted.This provides reference for the development and optimized design of down products,particularly those intended for use in extreme cold conditions.