Discontinuous tape winding, which has obvious advantages in large extension ratio winding, is widely used in the molding of composites. Therefore, the research on technological parameters becomes the focus of many sch...Discontinuous tape winding, which has obvious advantages in large extension ratio winding, is widely used in the molding of composites. Therefore, the research on technological parameters becomes the focus of many scholars. However, how to accomplish the variable tension control is usually not fully considered. Accordingly, the constant extension ratio and the smoothness of winding process cannot be ensured. Aiming at the problem of tension control, this paper first gives a comparatively deep research on the control method and the interaction mechanism of tension, extension ratio, automatic lap and automatic rectification. Then, according to the winding process features, the mechanical device and the mathematical model of tension control system are established respectively. With regard to the characteristics of PID controller and fuzzy controller, the fuzzy self-tuning PID controller is designed. As a result, the variable tension control is realized during the winding and lapping process, and the constant extension ratio is guaranteed. Finally, a sample application is presented for demonstration. By presenting the variable tension control techniques for discontinuous tape winding, the constant extension ratio of tapes is achieved, the consecution and the automation degree of winding process is improved as well. Thus, the quality of wound products is guaranteed.展开更多
利用局地分析与预报系统(Local Analysis and Prediction System,LAPS)的分析资料和多普勒雷达资料,对1522号强台风"彩虹"外围衍生的广州市番禺区龙卷风的特征进行分析。结果表明:广州市番禺区强台风"彩虹"衍生的...利用局地分析与预报系统(Local Analysis and Prediction System,LAPS)的分析资料和多普勒雷达资料,对1522号强台风"彩虹"外围衍生的广州市番禺区龙卷风的特征进行分析。结果表明:广州市番禺区强台风"彩虹"衍生的龙卷风为F2级强龙卷风,发生在台风移动方向右前侧约390.0 km位置,龙卷风位于强盛的偏南气流和东南气流辐合区,不稳定能量充足,垂直风切变较强,并有冷空气从低层渗透。雷达强度回波图上有明显的弓状结构,径向速度图上探测低层存在中等强度中气旋,但没有明显的钩状回波和悬垂特征,较难界定其为超级单体龙卷风还是非超级单体龙卷风。展开更多
基金supported by Shaanxi Provincial "13115" Important Scientific and Technological Innovation Fund of China (Grant No. 2009ZDKG-27)
文摘Discontinuous tape winding, which has obvious advantages in large extension ratio winding, is widely used in the molding of composites. Therefore, the research on technological parameters becomes the focus of many scholars. However, how to accomplish the variable tension control is usually not fully considered. Accordingly, the constant extension ratio and the smoothness of winding process cannot be ensured. Aiming at the problem of tension control, this paper first gives a comparatively deep research on the control method and the interaction mechanism of tension, extension ratio, automatic lap and automatic rectification. Then, according to the winding process features, the mechanical device and the mathematical model of tension control system are established respectively. With regard to the characteristics of PID controller and fuzzy controller, the fuzzy self-tuning PID controller is designed. As a result, the variable tension control is realized during the winding and lapping process, and the constant extension ratio is guaranteed. Finally, a sample application is presented for demonstration. By presenting the variable tension control techniques for discontinuous tape winding, the constant extension ratio of tapes is achieved, the consecution and the automation degree of winding process is improved as well. Thus, the quality of wound products is guaranteed.
