Virtual Design Technology (VDT) And Its Application In The Design Of Automatic Winder

It is well known that Automatic-Winder plays an important role in textile technology, affecting the quality and efficiency of subsequent working procedures. It is one of the most important textile machineries.With the rapid development of the worldwide textile technology, the international market demands most fabric of knot-free and defect-free quality accordingly. The full automatic single-spindle winding process is today's trend. The market of automatic-winder in China is almost monopolized by Germany, Italy and Japan. In order to change the status of wholly importing from abroad, we have now paid more and more attention to the improved technology as well as the recent designs of the auto-winder. The successful developing of homemade auto-winders will greatly improve the quality of products, as well as save the labor of workers by releasing the labor intensities and improving the labor conditions, which will further improve our competitive strength in the international market and result in significant economic benefits.This dissertation with the title "Virtual Design Technology (VDT) and Its Application hi the Design of Automatic Winder", is a project under the sub-program of "the 3rd stage CIMS engineering of Shanghai No.2 Textile Machinery Ltd. Co." (863-511-910-033) as subsidized by 863/CIMS program. Aiming at studying and developing the auto-winder and its key parts by utilizing VTD, so as to improve the functions of auto winder, shorten the design period and cut down the manufacturing costs.The work can be summarized as follow:The trend of VDT research is discussed. The problems to be solved are pointed out. The main objective of the research is about the key parts of the winder design.From the design trend of automatic winder and its latest development, the author tries to analyze the difficult designing points and tries to solve them by VTD.1. By way of actual procedures in the design practice, and taking advantages of the methods in developing virtual products by VDT, the present study can test and verify as well as guide the designingprocesses of the auto-winder.2. By studying the math model of Multibody Dynamics and its methods of realization, this task seeks to obtain the solutions by emulation methodson the 3D spatial linkage mechanisms.3. On the basis of the existing turbulent model and its respective numerical simulation, this study offers emulation solutions to the study of pneumatic splicing, by selecting appropriate models and the software ofComputational Fluid Dynamics.4. On the basis of computer emulation and the study of pneumatic splicing, as well as the math model of 3D spatial linkage mechanisms, this study can help to develop new types of pneumatic splicers in close co-operation with the machinery manufacturers.The creative aspects in this task may be summed up as follows:1. By applying the theories of modeling in the designing process,the authorhas worked out the virtual assembly modeling of the pneumatic splicer ofthe modified model Auto-winder EJP438, which can demonstrate thevalidity and applicability of the method. The obtained assembly model of the winding unit and the splicing chamber can be takes as substantial foundation for the emulation of thee auto- winder.2. Utilizing the governing equations of Computational Multibody Dynamics, the author has deduced the constraining equations of various members of the linkage mechanism of pneumatic splicer, established the math model forthe system and also applied the software UO to emulate the mechanical motion and to obtain the analytic results finally for the emulation of modified pneumatic splicer's mechanism.3. By applying CFD, the author studies the flow field in the splicing chamber by analytical methods and routines. By analyzing the emulated data in each model, the author has established the series forms of key parts of pneumatic splicer, which can provide the foundation for further developing of new types of pneumatic splicers.