许多工业产品表面纹理都可以被认为是由基本纹理单元在空间按照一定的规则进行排列组合的结果。但由于各种原因，这些有规则纹理图象经常出现一些缺陷，因而检测这些有规则纹理图象的缺陷是机器视觉检测的重要内容。为了对这种缺陷进行有效地检测，在对这类纹理图象进行功率谱分析的基础上，根据入眼的视觉原理，设计了两类匹配shot滤波器，即正常纹理匹配Gabor滤波器和缺陷纹理匹配Gabor滤波器。前者能够突出正常纹理，抑制缺陷纹理而后者恰恰相反。在将这两类滤波器用于规则纹理图象缺陷的自动检测时，均获得了良好的检测精度和速度。

The possibility of describing the jet from the dual slot die in the melt blowing process with a vortex pair was studied according to the nature of the vortex. A model of the synthesis of two jets was developed, The reliability of the model was confirmed by experimental data cited from literature. The prediction of the fiber diameter using this model coincided with that using the fitted equation with the data advanced by Harpham and Shambaugh. The effects of the equipment parameters, such as the angle between the air flow and the axis of the spinneret, the width of the die head and the width of the slot were also discussed.

A method of woven fabric defect detection using the wavelet transform adaptive to the fabric has been developed. With reference to the orthogonality constrains of Daubechies wavelet, by taking the minimization of the energy or the gray level of the pixels in the output sub-images as the additional conditions and using the random algorithm method, two sets of wavelet filters adapted to the fabric texture were formed. The original images of normal fabric texture and the fabric texture with defects were decomposed into horizontal and vertical sub-images by using these filters and the feature indices of these sub-images were also extracted. By comparing the feature indices of the normal texture with that of the defective texture, the fabric defects can be successfully detected and located.

研究了聚合物熔体在衣架型模头中的等温流动。采用幂律模型描述该熔体的流变行为，通过三雏有限元方法对此流动进行模拟，从而得到其速度场的分布情况，并且着重讨论了衣架型模头的几何形状对速度场分布的影响，特别是对出口宽度方向速度均匀性的影响。

The mathematical model of peripheral twist extent (PTE) length was set up by studying the kinematics and dynamics of the yarn in rotor groove. The value of PTE length was calculated by using numerical method, and the factors affecting the PTE length were also discussed. The results show that the theoretical predicted value of PTE length seems to be consistent with the measured value. The yarn linear density and rotor speed have remarkable effects on PTE length. The parameters including twist multiplier, navel radius and doffing tube radius, rotor diameter, and the rotor groove angle are certain to influence on PTE length.

This paper deals with the tensile behaviour of rotor spun yarns. Having regard to the special construction of rotor spun yarn, some modifications for Hearle's theory have been made morder to apply Hearle's theory to rotor spun yarn. The paper then goes into calculating the tensile curve and investigating the effect of main parameters and spinning conditions on the tensile behaviour of rotor spun yarn. It was found that the following facts are noteworthy for improving the mechanical properties of rotor spun yarn: (l) Selecting suitable navel so as to control the P. T. E. length within a reasonable range. (2) Improving the design of single fibre supply device to decrease the amount of spoiled fibre and hence increase the effective fibre length. (3) Increasing spinning yarn tension without yarn break to enhance the fibre migration ratio. (4) For the rotor spun yarn of industrial use, it is the way to increase the yarn strength that the rotor groove should be designed with the groove angle beneficial to decrease the yarn specific volume.