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Recently, the auxetic fabrics have gained much importance in the scientific and industrial community due to their excellent impact-resistance property. Due to this property, they have several applications, including automotive, aerospace, and ballistic areas. The auxetic three-dimensional (3D) woven fabrics are a less explored domain in the auxetic community. Herein, special attention is given to the numerical analysis of the 3D auxetic structure. The negative Poisson's ratio of 3D auxetic structures is studied using ANSYS workbench structural analysis module. The effect of binding yarn float length on negative Poisson's ratio is tested on ten different 3D orthogonal through the thickness structures with binding yarn float length of 1:1, 2:1, and 3:1. Furthermore, the effect of the number of binding yarns and the number of layers is also studied numerically. The results show that the auxeticity of the woven structure increases with increasing the number of binding yarns and their float length. Moreover, decreasing the number of layers from 3 to 1 increases the auxeticity.

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Back pain is a commonly known problem for drivers and passengers traveling in long route vehicles, especially buses and trucks. The problem becomes more severe for people suffering from bedsores. The current embodiment is a step toward addressing this problem. This method helps to regulate blood flow and provide comfort to the drivers and bedsore patients. Pneumatic cylinder and 24 semi-circular designed aluminum buds are used in the assembly that moves up and down along with the comforter foam and sheet to serve the purpose. This design is an active way of providing comfort and has significantly helped in reducing back and lower body pain. A survey was conducted by 100 participants to analyze the comfort of the current embodiment. The age of these participants was divided into two categories. Results showed that comfort varies with age and pressure. It was concluded from the survey that young people from 20 to 30 years appreciate high pressure, whereas elderly people from 30 to 50 years like low pressure. The results from analysis of variance were found to be significant with feedback results. This system is also helpful in regulating blood flow. It was concluded that most people like high pressure and the first pattern.