The Yarn Curve and Tension in Rotor Spinning

The effective way of finding the yarn curve shape and tension of OE（open end） yarn inside the rotor is carried out and treated by dividing the yarn curve into two parts, from which the trajectory of the yarn sliding on the navel surface is also obtained. It is pointed out that the yarn curve shape and tension will both fluctuate with the trajectory＇s revolving cycle inside the rotor. However, the fluctuation is not too great, so the motion can still be regarded as approximately steady for dynamic analysis.     

夹具CAD中元件设计方法的研究与实践

介绍了一种新的夹具元件设计方法。该方法通过定义基准图和关键参数,经比例变换获得新视图,不需编制参数化绘图程序,又能部分反映元件的实际尺寸,是对夹具元件设计方法的有益补充。     

ARTIFICIAL NEURAL NETWORK BASED ASSEMBLABILITY EVALUATION

Assemblability evaluation is a pivotal step in design for assembly (DFA). In this paper, the authors analyze the problem existing in previous assemblability evaluation methods, put forward a new approach-Artificial Neural Network based Assemblability Evaluation Method (AAE), describe the principles and implementations of the neural network in use for assemblability evaluation. AAE has been put into use in product design. The results of the experiments and analyses show that assemblability is measured more objectively, accurately and completely by using AAE than the conventional methods.     

用SAP5程序分析纺纱锭子的振动

随着计算机技术的发展和各种新型测试手段的出现,工程设计进入了一个新的阶段,即由早先的静态设计进入到动态设计,进一步采用了计算机辅助设计.本文应用大型通用结构程序SAP5计算了国产D3203精纺锭子的临界速度及振型,分析了锭子结构各种因素对其临界速度及振型的影响,初步选择了适当的锭子参数,以保证锭子的临界速度远离工作速度,提高锭子的运动稳定性,降低噪声,节约功耗.文章还给出了各刚度的参考值,为锭子的改进设计提供了方向.     

自动络筒机空气捻接器的捻接原理研究

研究自动络筒机空气捻接器的捻接原理.对退捻后纱线尾端的曲线函数进行研究,指出了一种合理的纱线尾端的曲线函数,并利用流体力学原理,具体描述了纱线在捻接孔内的运动,揭示了纱线捻接原理.     

锭尖球面超精加工中单片微机的应用

本文根据锭尖球面超精加工工艺对控制电路的要求,指出传统的由继电器、接触器组成的控制电路存在的缺陷及其原因,提出了应用单片机系统对锭尖球面超精加工进行控制的新方案,并详细地介绍了单片微机在超精加工机械上的检测和控制技术及其实际系统的组成,给出了程序框图;同时指出了为确保满足超精加工工艺要求所采用的一系列行之有效的硬、软件抗干扰措施。实践证明由单片微机系统对锭尖球面超精加工进行控制克服了原控制电路的缺陷,保证了加工台平稳动作、精确定位,满足超精加工工艺要求,并从多方面优化了整个机械的性能。     

花式纺机多单元变频控制系统的研究

介绍了花式纺纱机多单元变频控制系统，即以交流频器对花式纺纱机各运行罗拉进行转速调节，以PC机作为控制器，并开发一套软件系统用以提供对生产进行控制的人机界面。     

Computation and Measurement of Winding Tension in Ring Spinning

By studying the variations of balloon height and of wind-ing radius in any one winding layer of ring spinning, the formula for determining the winding tension in any layer is derived, and then the overall tension variation throughout all winding layers can be computed. A meth-od of measuring the winding tension is also introduced here, with the measured results agreeing with the com-puted ones, and so the reliable relationship between winding tension, speed and ring traveller weight can be thus obtained. The highest allowable spindle speed is also discussed.     

结构动态特征灵敏度方法及在倍捻锭子上的应用

首先根据结构动力修改的实际需要,在一般灵敏度基础上,提出了相对灵敏度概念.其次结合实例对传统的具有N自由度的特征灵敏度公式就其实用性和理论完备性进行了分析.最后对连续体如何进行灵敏度分析,提出了一种方法,并以倍捻锭子为例进行了计算.     

应用图像处理技术评定聚合物混合效果的研究

介绍用图像分析法评定聚合物混合效果。采用“象素的分布作为混合的度量”,适合于各种混合装置的混合性能评定,是混合效果评定方法中一个新的探索。