Research On The Abnormal Form Patch Winding Trajectory Design

With the promise of significant weight reduction and the advantages of high intensity and erosion resistance, the composite military has been widely used in the fields of aviation and aerospace industry, military industry and civil industry. The need for the composite material products becomes an ever increasing necessity. The filament winding, as an important composite material forming technology, has drawn much more attention in recent years. Winding component has been widely used throughout the industry fields and it has become an essential part of various equipments and manufacturing lines.The filament winding technology starts first in the western country. Generally speaking, their winding theory and software are more advanced than us. They have realized various gyration object and abnormal form object winding theory analysis, software programming and machine manufacturing. In China, the filament winding trajectory design is derived from the parametric winding theory, which is based on the mould outline formulation. The parametric winding theory is used to design the winding trajectory of gyration object or the mould which can be described by the formulation. Generally speaking, it can have an ideal and stable winding trajectory. However, as for the abnormal form objects such as the lamina, airplane inlet and T-shape mould, which can not be described by the formulation, this theory can't run well. Now, the non-gyration composite material winding products are made by hand paste, which can not ensure the product's strength, stability and manufacture efficiency. With the application of the abnormal form objects in various fields, this kind of manufacturing method is out of date. Therefore, how to design the abnormal form object winding trajectory has become an urgent problem.Because the abnormal form object can not be described by the formulation, this dissertation proposes the patch winding theory to solve this problem. The patch winding theory is based on the mesh nodes on the mould surface. The following is the patch winding theory. Firstly, the mould is meshed, and then, the mesh nodes on the surface can be output. Based on the space geometry, differential geometry, and the stable winding requirements of non-slip line and non-bridge condition, the doffing points of the winding trajectory are determined, and then, the overall winding trajectory design is programmed. Because the trajectory got by the patch winding theory is the disperse point trajectory, the traditional post disposal method can not manage this trajectory. Therefore, this dissertation presents a new post disposal method for the complex surface winding trajectory. It gets every approximate vector based on the space geometry and the mesh nodes. It can solve the problem of disperse doffing point post disposal efficiently.In order to verify the patch winding theory and the complex surface filament winding post disposal method, SQL Server is used to sort order and inquiry the mesh node data in this dissertation. The node data are got by visiting the database SQL Server with VC++. Then, the winding simulation and the winding trajectory post disposal can be put in practice. As for the assembled gyration object, this dissertation adopts one uniform winding trajectory design by using the traditional parametric winding theory and the patch winding theory respectively. Several kinds of gyration object can be wound with one winding trajectory, which can ensure the strength and avoid the step of assembling all the different winding gyration products into one. For the lamina, this dissertation uses the formulation to describe its outline approximately. The lamina is wound by the two methods respectively. For the airplane inlet, the patch winding method is used to design the winding trajectory and carry out the winding experiments. According to the experiment effects, the winding probability is analyzed for partial concave surface. For the T-shape object, according to the patch winding theory, this dissertation divides the transitional part into three sections and designs the winding trajectories respectively. Then, it unifies all the trajectories into one trajectory and it realizes the bestrewed winding by using one singular filament.