基于ABAQUS的纬编针织物热传递有限元分析

ABAQUS Based Finite Element Simulation of Heat Transfer Properties of Weft Knitted Fabric

为探索针织物热舒适性设计的评估和优化新思路,提供一种有效预测针织物热阻和表面温度变化的方法,对织物系统一维热传递进行有限元模拟。基于对织物试样尺寸测量得到的几何结构参数,利用三维建模软件Rhino建立纬编针织物的几何模型,并考虑织物周围静止空气,构成织物系统的三维模型;借助ABAQUS有限元分析软件,根据模拟环境设置载荷及边界条件,求解模拟数值,得到织物系统温度分布云图和热流图。最后将仿真结果和试验结果对比,对数值模拟结果进行验证。结果表明:织物外表面温度的模拟值与试验热阻值相对误差为2.62%,两者吻合度较高,证明有限元仿真的可行性;相同针织物规格下,羊毛和腈纶针织物热阻相差不大,并且大于棉针织物。

In order to explore new research approaches of knitted fabric design, evaluation and optimization of thermal comfort, an effective method for predicting the thermal resistance and surface temperature changes of knitted fabric was provided. The finite element simulation of heat transfer through fabric in one direction was investigated.On the basis of the measured fabric structure parameters, a geometric model of weft knitted fabric was established by a three-dimensional modeling software Rhino. The fabric system was assembled by fabric model and still air model around the fabric. The boundary conditions and the interaction were set according to simulation condition. The numerical solution, temperature distribution cloud diagrams and heat flow diagrams of fabric system were calculated by the finite element analysis software ABAQUS. Besides,the results of finite element simulation and experimental results were compared. The results indicate that the relative error of thermal resistance between numerical simulations and experiments is about 2.62%, which verifies the feasibility of finite element simulation. When the specifications of fabrics are similar,the thermal resistance of wool fabric is similar to that of acrylic fabric, and much larger than that of cotton fabric.