共查询到18条相似文献,搜索用时 62 毫秒
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为有效保持纱线卷绕系统中张力稳定,针对系统中存在的非线性和时变性参数,提出了一种基于张力观测器和参数自适应的无传感张力控制方法.首先,基于力矩平衡原理建立纱线卷绕系统数学模型,并设计了降阶张力观测器,将观测值作为系统输入前置反馈补偿值,避免了使用张力传感器带来的测量延迟;然后,采用Landau离散时间递推算法辨识卷绕系... 相似文献
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针对纱线卷绕系统内外部扰动较多,系统具有时变性和不确定性,纱线张力值波动较大,控制精度不高导致纱线断头等问题,提出了学习速率自适应与蚁群算法联合改进的BP神经网络PID控制策略。通过学习速率自适应提高网络学习速率,并利用蚁群算法调整网络初始参数。分别测试PID算法、BP神经网络PID算法与改进BP神经网络PID算法。结果表明:基于改进BP神经网络的无刷直流电机PID控制器鲁棒性更强,性能良好,纱线卷绕系统张力波动较小,断头率降低。 相似文献
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针对纱线在卷绕成型过程中不当的卷绕参数导致纱线出现的叠纱现象,笔者提出一种周期动态改变卷绕比的防叠算法.通过建立纱线卷绕过程中的数学模型,模拟纱线卷绕成型的过程,采用MATLAB仿真的方式重现了叠纱现象;在对叠纱过程进行理论分析基础上,采用周期动态改变导纱头速度的方式实现该算法.经过仿真实验与实机测试表明:该算法能有效... 相似文献
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德国AC-338络筒机是目前最先进的自动络筒机,具有生产效率高、产品质量稳定、设备性能可靠、维护方便、自动化程度高等特点.文章主要介绍了AC-338络筒机的技术配制特征、分析了主要部件的结构性能.通过全面的分析,便于提高对引进设备的消化和吸收. 相似文献
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簇绒地毯织机纱线张力是影响提花质量的关键因素,为对其进行有效控制,本文研究了步进电机输入对簇绒提花装置区间绕过纱线张力的动态变化情况。首先建立提花装置的步进电机的负载模型,并分析其角频率输入对输出电磁转矩的对应关系;然后,根据米纳科夫定理的原理,建立纱线段绕过提花罗拉前后纱线动态张力模型。同时,进一步分析步进电机的输入与提花装置绕纱的输出动态张力之间的数学模型,在选定提花罗拉半径r、中心距 、纱线包角 等初始条件下,利用迭代-欧拉法分析其数值变化情况,得出角频率输入与纱线张力输出之间的定量关系,并探究不同包角对纱线动态张力的影响机制,为不同绒高的簇绒地毯甚至满幅簇绒提花地毯的制造和研究提供参考。 相似文献
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In the present work, the initiative is being taken to study the spun yarn failure behaviour under real dynamic conditions i.e. winding. An attempt is made to study the dynamic failure behaviour of blended ring yarn in relation to yarn structure. Multi-coloured tracer fibre technique is employed to study the broken ends of yarn during the winding process in terms of proportion of fibre break/slip, configuration of yarn broken end and yarn failure length. The ring spun yarn failure during winding is basically dominated by fibre breakage. The length of broken and slipped fibres is found to be different in trailing and leading portion of the broken ends and also depends on viscose content in the blends. The failure zone length and sum of percentage of tapered and slipped broken ends are found to follow the exactly similar trend with fibre failure coefficient with the change in blend ratio. The mathematical model established to explain the spun yarn failure during winding process displays lower error%. 相似文献
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给出了常用细纱机型卷绕成形齿轮的经验计算公式,并以FA506型细纱机为例,对经验公式的推导过程进行了介绍,为棉纺厂工程技术人员进行细纱工艺设计提供了参考依据。 相似文献
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Residual yarn detector plays an important role in the pipeline of spinning-linked winding systems. This research proposed an image-based method to improve the traditional detectors who have weaknesses such as low precision, low sustainability and yarn-damage-possibility. A detection system was developed to capture and process the bobbin images. The proposed algorithm includes three main steps: bobbin recognition, residual yarn reusability judgment and un-reusable residual yarn detection. With the utilization of the adaptive threshold, profile detection, region-of-interesting extraction and frequency-tuned salient region detection, the bobbins were classified into three classes with a desirable accuracy rate. The proposed method was applied on 21 different bobbin samples and obtained a 100% detection rate, which demonstrated that the method is effective on different samples. To test the robustness of the method, it was tested in eight different light conditions. The result showed that the method is reliable in a wide range of illumination intensity. 相似文献