Papers by Author: Wen Hua Ye

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Authors: Li Jie Cao, Wei Fang Chen, Yu Zhi Chen, Wen Hua Ye
Abstract: Large gantry machining centers are used for machining of products in almost all industry. To raise the design and production efficiency of machining centers, an integrated method of fast design and analysis is proposed in this paper. Firstly, large components unit structures are decomposed and extracted based on functions and structures. Then, after conducting fast analysis using APDL programming, a method of Comprehensive Evaluation is employed to optimal select the design schemes. Finally, the column of large gantry machining center QLMT6300 is taken as example to illustrate the validity of the method presented.
Authors: Hu Lu, Xia Liu, Wei Pang, Wen Hua Ye, Bi Sheng Wei
Abstract: The assembly line is very complicated and its performance directly determines the aircraft production efficiency and cost. Therefore, the modeling, simulation and optimization for aircraft assembly line are very important. In this paper, a modeling and simulation approach for aircraft assembly line based on Quest simulation software has been investigated. Firstly, the characteristics of the aircraft assembly and Quest are briefly introduced in this article. Then, the assembly process model of center fuselage was established, the assembly process is simulated and analyzed, the bottleneck in the production line has been found, which can be used to optimize the assembly line.
Authors: Xiao Ming Qian, Wen Hua Ye, Xiao Mei Chen
Abstract: This paper advances a method to implement the on-machine measurement (OMM) with the touch-trigger probe, also called switching probes. Some of the advantages and disadvantages for touch-trigger probe are discussed. However, the touch-trigger probe errors exist and become one of the major errors for the measurement accuracy. Major factors that influence the probe measurement have been analyzed. The basic technique of probe measurement error modeling with artificial neural network was researched, and also the probe measurement error compensation with 3-layered backpropagation artificial neural network was presented. At last in the experimental system composed of DIXI 50 machining center, Fanuc 16i control system, Blum CNC P82.046 probe and PC, valid the correlated techniques. In addition, the connection and communication between the machining center equipped with probe system and the computer have been introduced. The experiment indicated that, using the touch-trigger probe makes on-machine measurement more automatic and efficient. And by using the back-propagation neural network for error compensation make on-machine measurement more precise.
Authors: Qing Huang, Wei Fang Chen, Wen Hua Ye, Pei Huang Lou, Shi Hao Liu
Abstract: The crossbeam is an important part in the gantry machining center which greatly affects the machining accuracy. Four kinds of crossbeam structure for the large machining center were designed and their static and dynamic characteristics were analyzed. The optimal crossbeam structure was selected by the comprehensive performance evaluation method. Then the thicknesses of rib plates in the crossbeam were defined as the optimization parameters after conducting the sensitivity analysis. The first four natural frequencies were defined as the objective functions and the static performance and the mass were defined as the constraint conditions. The optimal sizes of the rib plates in the crossbeam were obtained by the optimization analysis. Finally the feasibility of the result was demonstrated by the simulation. The result indicated that with the mass increased only by 0.18%, the first four natural frequencies of the optimal crossbeam were increased by 19.56%, 19.45%, 19.84%, 17.05%.
Authors: Xia Liu, Wen Hua Ye, Bi Sheng Wei, Sheng Leng
Abstract: The process time of aircraft assembly line is easily influenced by the efficiency of workers, the supply circumstance of components and the assembly quality. While the aircraft assembly line is hardly to reconfigure after it is in use, in order to optimize the assembly line before its application, a new object-oriented modeling method based on hierarchy and stochastic petri net has been put forward in this paper. The behavior and the structural characteristics of the model have been analyzed according to the solution of linear invariant. Finally, the model of aircraft wing assembly line has been established as an example, which proves the feasibility of the modeling method.
Authors: Z.G. Man, Wen Hua Ye, P. Zhao, Pei Huang Lou, T.J. Wu
Abstract: In order to implement vision-based navigation of AGV (Automated guided vehicle) with complex path, a method incorporating RFID (radio frequency identification) technology with image processing technology is proposed, in which RFID technology is used to recognize nodes and image processing technology is used to detect path. Straight line path is detected by Hough transform in case that AGV runs straightly, while curve path is detected by line scanning in case that AGV turns right and left. Experiment results show that, with the method presented in this paper, the navigation of path tracking for AGV is implemented well.
Authors: Bi Sheng Wei, Wen Hua Ye, Xia Liu
Abstract: As object-oriented simulation software adopts event-driven simulation method, it can not show the logical and temporal relations among the objects clearly, and the formal description of the system is not sufficient, that leads to low reliability and the establishment of a perfect simulation model may need several modifications and debugging. According to the problems that exist in the object-oriented simulation software, a modeling and simulation technology is presented based on Petri Net and QUEST in this paper, which combines Petri Net’s rigorous description with QUEST’s visual feature. Base on the practical application requirements in visual C++ environment,to realize the integration of the object oriented Petri model and the QUEST model.
Authors: Shi Hao Liu, Wen Hua Ye, Wei Fang Chen, Ting Zhang
Abstract: Processing precision of numerical control machine tool is decided by static rigidity and dynamic rigidity of spindle to a great extent. 3- D model of numerical control machine tool was established by using parametric modeling and virtual assembly function of Solidworks. Simultaneously, simulation and Experiment study of the spindle static rigidity was carried out, and practicability of the simulation analysis method was proved. The result indicates that the biggest deformation appears in the front of spindle. The static rigidity of spindle can been enhanced greatly by enhancing three carriage-feed system’s static rigidity of machine tool. The simulation for the dynamic rigidity of spindle indicates that the dynamic rigidity of spindle is uniformly distributed and resonance can be avoided effectively by the spindle when working.
Authors: Rui Jun Liang, Wen Hua Ye, Qun Qiang Chen, Xin Jie Zhao
Abstract: With the increasing of machine tool feed speed, a large quantity of friction heat is generated on the ball screw system and will cause the temperature rising and thermal deformation along the ball screw that reduces the machining accuracy. The heat accumulated and dissipated are calculated to load to the established model of the Y feed system on a gantry machine tool. The stable temperature field at thermal equilibrium and the unstable temperature field before thermal equilibrium or with the variation of thermal load are gotten. From thermal structure analysis, the thermal deformation is derived. The FEM model is verified by the experiments carried out under the same condition with the simulation.
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