Dissertation > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Machine-assisted technology > Machine -aided design (CAD), aided drawing

A New Method to Simulate Fancy Yarn and Fabric Based on Fractal Theory

Author GuoZuoJie
Tutor ZhangRuiLin
School Zhejiang University of Technology
Course Applied Computer Technology
Keywords Fancy yarn The appearance of the structure model Realistic simulation Fractal geometry Texture mapping Random texture
CLC TP391.72
Type Master's thesis
Year 2010
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A long time, the fabric of CAD technology has been the computer is an important application in the field of textiles and research directions, fabric CAD as a means of high-tech textile design and production to provide a lot of convenience. To simulate the appearance of the fabric in the design phase will be able to predict the appearance, played the role instead of test weaving sample, greatly improving the efficiency of the new products, development of new varieties, the fabric of CAD study has great practical value and broad application prospects . Yarn and fabric appearance simulation is an important part of the fabric CAD system. Fabric CAD system at home and abroad, the status quo and existing yarn and fabric simulation method to carry out a detailed analysis of the simulation. Based on analysis of the physical geometry of fancy yarns and yarn principles to establish a the several common fancy yarn mathematical model. Generated through the establishment of the yarn surface illumination model simulation the twisting yarn realistic effects of light irradiation, and on fractal theory is applied to the simulated yarn random hairiness and fabric folds randomly look. First, the physical geometry of the fancy yarn from the start, based on its the weaving principle and process parameters, to establish yarn appearance mathematical model, and further establish the yarn surface illumination model and pilling fleece algorithm, mainly to simulate a single yarn twisted yarn, loop yarn, knot yarn, waveform yarn, chenille yarn four kinds of fancy yarn appearance of realistic effects. Meanwhile, the effect of the fancy yarn is embedded in the fabric also simulated. Second, this paper studies the basic model of fractal growth theory - diffusion limited aggregation (DLA) model analysis and computer simulation methods DLA model, and the model of the evolution of the discussion, to get the effect of various forms of cohesion. Combined the DLA simulation model and yarn and conclusions with the bilateral linear DLA algorithm to generate the the hairiness template, with basic yarn texture synthesis, more realistic simulation of the effect of yarn hairiness. Third, the paper also analyzes the principle of the the RMD algorithm simulates fractional Brownian motion, and to achieve a one-dimensional RMD algorithm Health Composition-shaped curve and the two-dimensional the RMD algorithm Health fractal surfaces. And one-dimensional RMD algorithm used to generate the yarn hairiness. Discrete gradient search texture mapping algorithm paper, synthetic RMD curved template and fabric effect, for simulation of random folds of fabric surface buckling effect. The experimental results show that the RMD algorithm to generate random uneven texture surfaces ideal effect, can also be used in the research of other random texture generation. The innovation of this paper is that the DLA fractal theory model and RMD algorithm applied to the simulation of the effect of the fancy yarn hairiness were more realistic this way reflects fancy yarn irregular, random variable and local self-similar characteristics of hairiness, and for the first time proposed a the discretized gradient search texture mapping algorithm \The methods and conclusions of this research has opened up a new way of thinking for the realistic simulation of yarn and fabric. The experiments show that this paper, fancy yarns and fabric simulation method is feasible and effective, and the simulation study and improve further and applied to textile CAD has important practical significance.

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