| Knitted sweater is the knitted fabric in which individual parts are formed in one piece,there are no darts and dividing lines,and only the parts are stitched in place after getting off the machine.Compared with traditional clothing,knitted sweater has the advantages of good fit,efficient weaving,saving raw material consumption,comfortable wearing,etc..Compared with advanced fully formed clothing,knitted sweater has low requirements for knitting equipment,the forming process is relatively simple and easy to operate,so it occupies a large market share in the sweater field.When the apparel industry began to develop in the direction of digital and online virtual display,knitted sweater also entered the era of digital design and production.In the process of realizing digital design and production,woven clothing has a version to follow,and on the basis of obtaining plates,the size of the clothing can be predicted,and the rapid design of virtual clothing can also be carried out.However,the knitted sweater has weakened the existence value of the darts and dividing line due to its unique elasticity,ductility and forming method.The basic woven plate is no longer suitable for knitted products,so the digital design and production of knitted sweater is still in the stage of determining the size according to the sample.In addition,the woven three-dimensional virtual design method is difficult to present the knitted coil string sleeve relationship,and the fully-formed virtual design method based on the coil structure is complex and the simulation process is long,how to realize the three-dimensional simulation quickly and well of knitted sweater has become a research hotspot.In order to realize the digital design and production of knitted sweater,and improve the design,development and production efficiency,this topic discusses the basic plate design method of knitted sweater,establishes a parametric design model to achieve rapid design,summarizes the influencing factors and establishes a finished product size prediction model to guide production.It also studies the three-dimensional virtual design method and proposes a counterpoint splicing model to improve the simulation effect.Firstly,the production principle and methods of the basic plates of the knitted sweater are studied,and the parametric models of the basic plates are determined.It is found that the three-circle arc fitting methods can be used to realize the parameter constraints of the neckline curve and the armhole curve,and the Bezier model can be used to transform the complex curve into a simple parameter language at the sleeve mountain curve.Geometric constraints and annotation constraints are carried out on straight parts and key parts,and the purpose of entering user parameters for variant design can be achieved through parameter constraint relationships.Secondly,the influencing factors of the size change of the knitted sweater are studied,and the orthogonal experiments are designed by using 3 yarn raw materials,4 tissue structures and 5 yarn bending depths.Under the same conditions,the samples are knitted and dimensioned after standing for 48 hours and after finishing.Through exploration,it is found that there is a significant correlation between the bending depth and the finished size,and a size prediction model is established accordingly to obtain the finished size by entering the bending depth.In view of the dimension errors,the device can be improved on the computerized flat knitting machine nip,and the yarn tension can be stabilized with the help of lifting chutes,thereby improving the dimension stability of the finished products.Thirdly,the three-dimensional virtual design methods of knitted sweater are studied.On the basis of the planar two-dimensional plate,a three-dimensional conversion model is established,and the key points of the part are determined to realize the surface design and self-fusion of the plate.During the digital simulation of the fabric,the initial alignment point can be determined on the plate with the help of texture mapping.The use of plate and coil alignment splicing method to convert complex coil alignment into simple triangular mesh alignment can improve the continuous consistency of coil and tissue pattern at the seam part,and enhance the three-dimensional simulation effect of knitted sweater.Finally,on the basis of summarizing the previous research content and results,the whole process of digital design and production of high-neck saddle shoulder sweaters,V-neck sleeve sweaters and square-neck raglan sweaters is carried out.Through the size comparison analysis and subjective simulation effect evaluation,it is found that the digital design and production methods obtained are suitable for knitted sweater,the parametric methods can quickly obtain the sweater plates,the predicted size and finished size error are kept within ±3 coils,the three-dimensional simulation effect can basically meet the design requirements,and the tissue pattern can achieve rounded splicing.Through the above research,the convenience,digital design and production of knitted sweater can be realized,and the knitted sweater pattern making methods can be enriched.The combination of parametric plate making model and size prediction model simplifies the production design process,and the virtual display of knitted sweater using 3D simulation technology can realize the product without physical preview and avoid the waste of manpower and material resources caused by repeated proofing.This project transforms complex design and production methods into a simple digital language,improves design and development and production efficiency,and provides a practical and effective way to design and produce knitted sweater. |
