双纱纺成纱区几何状态和单纱捻度的试验研究

在双纱纺纱中,交汇区中的单纱捻度和交汇角对成纱的性能有很大影响,我们将相隔一定距离的两股黑白复丝从前罗拉后方喂入加捻卷绕机构来模拟双纱纺纱过程,并利用高速照相对纺纱过程中的纱线进行动态摄影,分析了一些主要纺纱工艺参数对纺纱过程和纺捻线性能的影响。     

超高分子量聚乙烯冻胶纤维拉伸流变性能的研究

本文通过恒速拉伸测力仪探讨了超高分子量聚乙烯冻胶纤维的拉伸流变性质,发现它的表观拉伸粘度η_(?)与拉伸形变速率ε之间的关系曲线因温度和拉伸倍数λ的不同可分为三种类型。三种曲线均在ε=0.005s~(-1)左右发生了重大转折,说明ε=0.005s~(-1)处是聚乙烯冻胶纤维在拉伸时,大分子链缠结与解缠这对矛盾的关节点。不仅η_(?)与ε的关系曲线在此处发生重大转折,而且拉伸应力σ_(?)与ε的关系曲线也在此处出现极大值。实验还发现温度对η_(?)的影响可分为二个区。在低温区,拉伸粘流活化能E_(aⅡ)=20～50kJ/mol,对应于纤维内自由体积的收缩和无定形区的变形;在高温区,拉伸粘流活化能E_(aⅠ)=150～330kJ/mol,对应于大分子链的滑移和伸直链结晶的发展,E_(aⅠ)随拉伸倍数的上升而下降。二个温度区之间的转变温度T_D=117～123℃,它受ε和λ的影响而略有变化。λ较大时,T_D较小;ε较大时,T_D就偏向上限。     

A METHOD FOR REDUCING YARN HAIRINESS AT RING SPINNING

In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found that the geometrical shape of travellers is the key factor affecting the yarnhairiness at ring spinning.     

INVESTIGATION OF NEW COTTON RING AND TRAVELLER

A new Ω type cotton ring and traveller is introduced.The idea of its design is based on thefacts that running travellers deviate from normal profile in three coordinate directions and such adeviation can be utilized when the balloon expands.The contact between ring and traveller at outerrace can be increased to prevent the balloon from expanding and the traveller from continuous in-clination.Consequently,the wear of inner corner of ring can be reduced.This proves the maincourse of deterioration of ring.With small sized balloon,the outer contact diminishes.The yarntension is thus adjusted and average tension is cut down.Experiments on 13 and 29 texcotton-polyester yarn spinning prove the above idea correct.With the wear of ring greatly reduced,running life is more than doubled,end breakage rate falls 30% and power consumption falls 2%.The economic profit,estimated by pilot test,is an increase of production 6.1% and 130,000 YuanRenminbi per ten thousand apindles each year.     

AN INVESTIGATION OF THE RELATION BETWEEN COTTON FIBRE PROPERTIES AND YARN QUALITY BY USING HIGH VOLUME INSTRUMENT(HVI)SYSTEM

The objective of this paper is to establish reliable prediction equations relating cotton fibreproperties measured by HVI system and yarn quality,A useful statistical method is adopted for de-veloping a multiple regression model interpreting the relation between the data of Spinlab HVIfibre properties and quality parameters of yarn STQ (Strength Tex Quotient).The percent relativecontribution of a fibre property with respect of STQ is also assessed.The results show that the totalcontribution of the HVI measured fibre properties can account for 77.4% of known variation ofyarn STQ.The main feature of the approach is its flexibility in accommodating all fibre properties.The examination of regression equation showed that it could be well applied to predict STQ ofyarns spun from the same spinning system,but,for different spinning systems and also for yarns ofdifferent linear density,modification of the equation would be needed.     

复合转子异步电机的等值电路及其参数计算

给出了复合转子异步电机等值电路的一般形式及其参数的计算公式;提出了等值电路的实用形式;就该电路参数特别是转子两层间的互感抗的计算方法进行了较详细的讨论.样机计算结果与实验结果的对比,证明了实用等值电路计算的准确性.     

四倍捻线的结构性能测试

介绍了多倍捻技术。对四倍捻纱线的结构性能进行了相应的测量分析，并与一般纱线进行了结构上的比较，找出了四倍捻纱线在结构性能上的优点和不足，作出了相应的评判。对四倍扮纱线性能进一步改善提出了方向．     

环锭纺捻陷现象的研究及捻度损失的计算

本文研究环锭纺动态捻度传递过程，对导纱钩的捻陷作用及捻度损失的计算进行了分析探讨。同时，对用欧拉张力公式计算在摩擦表面上运动纱线的张力的方法进行了补充修正。     

挤压油膜柔性转子系统的优化设计

将优化设计方法应用于挤压油膜阻尼器－滑动轴承－柔性转子系统，从优化变量的选取、目标函数、约束条件等几方面来确定优化设计的数学模型，并将此模型应用于具体的实例中。计算表明，转子系统通过优化，能有效地改善系统运行的稳定性能。     

磁轴承柔性转子系统动力特性建模与优化仿真

建立了电磁轴承柔性有质转子系统计入陀螺、阻尼、轴－径向动力耦合及机械－电磁－控制系统耦合等影响的动力特性分析计算数学模型，导出了多变量控制系统的标准化系统矩阵向量方程。以系统仿真响应为目标，通过复合寻优方法实现了系统最佳工作区（点）的求解。对优化仿真结果与试验现场调试结果进行了对比分析。