棉纤维长度测试系统的开发

Research of non-resin winding cylinder preforming retracing cosine curve

为使复合材料圆柱壳体预制件适应短周期快速生产、低成本、壳体厚壁成型的要求，基于缠绕区段划分原理推导出端部余弦折回曲线方程，并结合传统纺织理论，推导了余弦折回曲线模型下端部特征参数计算公式。最后基于对余弦折回曲线的分析，利用数值模拟证实余弦折回曲线在于纱缠绕圆柱壳体预成型中有利于高速加工；在缠绕厚度相对不大且需要高速缠绕加工情况下，可采用余弦曲线作为端部区段的折回曲线。

To satisfy the requirements of fast producing, low cost manufacture and large thickness preforming in the field of non-resin winding cylinder composite, the equation of retracing cosine curve was deduced based on the section principle. Combined with the traditional textile technique theory, characteristic parameters＇ calculation formulae of end-section were deduced under the retracing cosine curve model. Finally, on the basis of analysis of the retracing cosine curve, in non-resin winding cylinder preforming technique, signification of high speed machining under the retracing cosine curve model was illuminated and testified by the way of numerical value simulation. As a conclusion, cosine curve should be used as retracing curve under the condition of high-speed winding and relatively common cylinder thickness.