Papers by Author: Yi Nan Lai

Abstract: Winding molding is a commonly-used molding method for composite fiber materials. In this method, the fiber winding tension control is a key technique in fiber winding since the winding tension directly affects the quality of winded products. Here designed is a closed-loop tension control system, equipped with the PLC as the main controller, the industrial control computer as the upper-host, the alternating numeric servo-electromotor and air cylinder as the actuators, and with the angle sensor of real time feedback filament tension change is designed. Presented below is Fuzzy-PID control algorithm, which combines the advantages of PID and fuzzy control by adopting the theory of adapt fuzzy control in big error range and adapt PID control in small error range. Experimental results prove that the principle of the design scheme is right with tension deviation less than 4 pers, response time about 0.4s and thus meeting the requirements of the system well.

Abstract: Take “Research on minitype universal autonomous docking mechanism” as an example, the paper studied on the platform of complex product’s cooperative design and simulation of mechanical field. The process of mechanical component design was introduced. The paper put forward the bottleneck problem in the design process of data transmission and gave the solution. A new method that uses HLA/RTI (High Level Architecture/Runtime Infrastructure) for function module communication was given. By using component technology and integrating all the function module of current commercial software based on the design process, this platform expands easily and the simulation sub-system can plug and play.

Abstract: Quality control is very important in the manufacturing process of cold tube-bending, but most of enterprises can only verify tube quality by the tube bending machine. Based on the platform of commercial software, an integrated system on CAD/CAPP/CAE for bending tube in power plants boiler is developed. The system is carried on re-development under the VC++ language environment, and data is transferred in Pro/E, Ansys and designing module through a reasonable data structure and interface. So we can share data and realize flexibility and standardization of the processing. The application result indicated that the integrated system can offer a whole set of solution from building a CAD model, forecasting tube bending quality and structure optimization by CAE methods to programming CAPP processes.

Abstract: A FEM-numerical simulation system is developed to simulate the process of rotary draw bending of tube. The emphasis is to discuss some factors such as tube materials, bending moment of fan-shaped die, pushing force of sliding slot and tube relative bending radius which have an effect on tube bending quality. The quality parameters of ovality, thinning ratio and thickening ratio are the same as the measurement values in the practical production. Some improved methods are put forward to according to the simulation results. The experiment shows that the simulation system can forecast accurately the deformation in the process of tube bending, so the production manufacturing cost decreases greatly.

Abstract: The numerical simulation method is used to solve the problems of pipe bending manufacturing such as die with fine cracks, ovality of pipe. The fan-shaped die is welded with steel plate in circle and rib in radial direction by the analysis of structural deformation. The optimal design is provided with ovality of pipe as object variable and sliding slot dimensions as design variables. Compared with experiential shape groove of slot, ovality of optimized slot decreases about 10.5% in average. It greatly reduced the production cost using computer simulation method to replace a lot of experiment improving tube-bending production.