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2 Autex Research Journal

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On-line fabric defect detection and full control in a circular knitting machine

100%

Abou-Taleb H. A. , Sallam A. T. M.

Autex Research Journal

2008

tom Vol. 8, no. 1

21--29

This study has shown that image analysis has great potential to provide reliable measurements for detecting defects in knitted fabrics. Using the principles of image analysis, an automatic fabric evaluation system, which enables automatic computerised defect detection (analysis of knitted fabrics) was developed. On-line fabric defect detection was tested automatically by analysing fabric images captured by a digital camera. The results of the automatic fabric defect detection correspond well with the experimental values. Therefore, it is shown that the developed image capturing and analysis system is capable of on-line detection of fabric defects and full control in the knitting machine (for example, by stopping the circular knitting machine as soon as a defect is acquired by the digital camera).

Manufacturing 3-D braided composite trusses

80%

El-Qaleoby W. , El-Aela A. G. , Abou-Taleb H. A. , El-Shiekh T. M.

Autex Research Journal

2007

tom Vol. 7, no. 3

180--193

A design methodology for the production of complex shapes through near net shape manufacturing is presented. The data was obtained by using a 3-D circular braiding machine that was designed and constructed by Prof. Dr. Aly El-Shiekh. Production of a braided truss shows the procedures required for producing right-angled and contoured parts, as well as the feasibility of producing such parts. The FRPC (Fibre-Reinforced Polymer Composites) truss reinforcement system was designed to simulate the conventional iron truss reinforcement system typically used in a concrete bridge deck. A technical comparison of FRPC (Fibre-Reinforced Polymer Composites) truss and steel truss is carried out with respect to weight, cost, compression and bending strength. Experimental results are presented to show how the nominal stresses (compression and bending) of 3-D braided composite trusses depend on truss height, truss width and truss angle, i.e. the number of working layers, number of yarns per each layer, braiding pattern and number of beats per cycle. It is shown that accurate mathematical models could be developed from the laboratory data to predict the compression and bending stresses of the truss from the basic braiding machine settings by using factorial design. The excellent fit of the predicted values with the measured values confirms that the mathematical models developed can be used to make accurate prediction of the compression and bending stresses from a knowledge of the truss specifications.