The Research On Weaving Methods Of Three-dimensional Orthogonal Woven Fabric And Virtual Prototype Of The Loom

Three-dimensional woven fabric preform is an advanced composite perform, in which an enhanced fiber is inserted in the thickness direction, to overcome the weak performance shortcomings of the traditional layers of the composite perform, effectively improving the overall preform mechanical properties, also has good integrity, profiling and high-energy absorption characteristics. Therefore, these composites is widely used in aerospace, shipbuilding, construction, automobile manufacturing and other fields.With the 3D woven perform widely used, some special perform should not only have special characteristics, such as high degree of mixed and suitable directional continuous yarn, but also have a complex or irregular shape. Recently, we cannot adopt this method that perform is cut to get the shape needed. The 3D fabric is usually wevon by weaving, knitting, braiding and some non-woven methods, but through cutting the perform produced by these methods cannot be made into the required high degree of interwoven fabric pieces. In order to solve this problem, the thesis adopts bidirectional shedding mechanism in the design of shedding mechanism for 3D orthogonal looms.In this paper, firstly, a parameterized functional model of five motion mechanisms of the three-dimensional orthogonal loom is established in the mechanical system dynamics simulation software ADAMS, and through the simulation analysis of the these mechanisms the optimum design results is achieved. By three-dimensional design software Pro / E, the three-dimensional orthogonal loom machine and its parts are modeled and assembled. And then the simulation analysis and design study of virtual prototype of three-dimensional orthogonal loom is carried out in the ADAMS software, and the finite element analysis of the relevant parts is also completed in ANSYS/Workbench. The data ex-change can be carried out via a seamless interface between these software, these can be used for co-design、simulation analysis、parameterized improvement、parameterized optimized design and improved motion control, etc. Through these design aspects weaving machine can achieve design requirements, and good work performance. In this paper, three-dimensional orthogonal is taken looms as the research object, and mainly in-depth research in the following areas:The first, According to the fabric structure to be obtained, the pattern diagram of woven fabric preform is designed. The shedding mechanism of weaving machine has adopted dual-directional shedding mechanism, and the heald frame has been designed specially,so the pattern diagrams of traditional looming are not available for the three-dimensional orthogonal loom. This paper designs the pattern diagrams of several special fabric structure.Second, A dual-directional shedding mechanism is designed and studied. Shedding mechanism of the two directions is installed eight heald frames respectively, which the high-speed electronic shedding mechanism can be independently controlled, and the simulation analysis to its performance of kinematics and dynamics are done. Meanwhile, the model analysis is made to the heald frame, which provides a basis to the improvement of the dynamic characteristic of heald frame.Third, According to this special three-dimensional orthogonal fabric, a parallel beating up mechanism is designed, The beating up mechanism can make the weft parallel to the cloth-fell,and produce the same striking force on each weft yarn. The simulation analysis of two different parallel beating up mechanisms are done to obtain an optimal ones.Fourth, The article studies the parameterized modeling and digitized modeling of the three-dimensional orthogonal loom as well as its assembling methods, and performs the simulation analysis of kinematics and dynamics for it in ADAMS, and verification to the simulation results.The thesis completes the design of 3D orthogonal loom by using virtual prototype technology, forming a new type of mechanical design method for the application of collaborative simulation technology of virtual prototype design, which has been widely used. The textile composites woven by this special shedding mechanism have good mechanical properties, widening the application range of textile composites, especially they are applied to some of the cutting-edge areas of science. It lay the necessary foundation for the development of textile composites.