e-Engineering & Digital Enterprise Technology

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Authors: Zi Yang Cao, Ning He, Liang Li
Abstract: In order to investigate the effects of cutting edge radius on micro/meso-scale cutting process, the current paper is concerned with a fundamental investigation of the contribution of cutting edge radius to cutting temperature, stress field and size effect by means of two-dimensional finite-element simulation for orthogonal cutting process. The results indicated that cutting edge radius has remarkable effects on cutting temperature and stress field, and the existence of cutting edge radius is one of the main reasons generating size effect. The cutting edge radius affects the micro/meso scale cutting process at smaller uncut chip thickness by altering the effective rake angle and enhancing the plowing effect, affecting the material deformation process, expanding and widening the plastic deformation zone, and causing higher energy dissipation due to increased tool-chip contact length.
Authors: Shi Sheng Zhong, T.C. Wang
Abstract: The scheme design of large-scale hydraulic turbine is a complicated, multi-hierarchy, multi-attribute and creative process of product structure configuration. In order to improve the design quality and the design efficiency, a scheme design of large-scale hydraulic turbine system based on multilayer-case-based reasoning (MCBR) with grey relational analysis is developed and applied to enterprise project. The performance of the developed system is validated by the application to the practical enterprise project; the result of the application also indicates that using artificial intelligence technique in large-scale hydraulic turbine scheme design can extend the process ability of CIMS.
Authors: L. Zhou, H.B. Zhang, Qiang Liu
Abstract: In order to meet the demands for high precise micro-displacement testing, a differential capacitive displacement sensor based on RC multi-oscillating circuit was designed. It has two couples of polar plates, and gets the displacement by testing frequency through the multi-oscillating circuit. This capacitive sensor has many advantages such as simple structure and testing circuit, high resolution and good stability.
Authors: C.X. Zhu, Yong Xian Liu, Guang Qi Cai, L.D. Zhu
Abstract: Take a kind of 3-TPT parallel robot as an example, the model of flexible multibody of parallel machine tool is built by using multibody dynamics simulation software ADAMS and finite element analysis software ANSYS. And dynamics equation of flexible body in spatial is also set up, after that the dynamics simulation is carried out. Then the simulation results of rigid bodies are compared with flexible ones, and the results show that the forces applied on flexible bodies appear high nonlinear, so the simulation results of flexible multibody system are more authentic, nicety and can reflect actual dynamics characteristic of parallel robot.
Authors: W.R. Jiang, Ze Sheng Lu
Abstract: The hysteresis in piezoelectric actuator is the main factor that affects its displacement accuracy, the hysteresis model is set up by using the theory of preisach, and the research on open-loop control of piezoelectric actuator is carried out based on inverse preisach model. The result shows that the model can describe successfully the hysteresis in piezoelectric actuator, predict the displacement after a series of random voltage path perfectly, and improve the hysteresis of displacement effectively, decrease the nonlinear error of system, increase control precision. A new microactuator with high-resolution and large-stroke based on piezoelectric is presented, and the open-loop control is investigated based on inverse preisach model, its stroke is 300mm, the position accuracy is about 0.03μm, the displacement resolution is up to 0.02μm.
Authors: Pei Quan Guo, Chuan Zhen Huang, W. Wang, N. Fan
Abstract: According to the analysis of engagement between indexing roller and cam contour as gear indexing cam mechanism operating and milling process as contour being machined, three kinds of surfaces, cam’s contour, the surface swept by roller’s axis during engagement and the surface swept by cutter’s axis in milling process, are equidistant surfaces. Based on isometric theory, the approaches to determine tool path and to calculate NC program coordinates for inequi-diameter milling have been developed. The architecture of computer aided programming software for inequi-diameter milling was illustrated. Practical example of inequi-diameter milling NC codes was presented. In inequi-milling process, NC program can be updated to adapt the change of cutter diameter in time. So, cutter’s life can be prolonged, the cost of cutter can be cut down.
Authors: Xiao Dong Yang, Yang Wang, P. Yang
Abstract: In this paper, a teeth correction 3-D data modeling technology based on the basis of optical measurement is proposed. Using structured light measurement, the STL data of the teeth plaster model are obtained. Based on STL data, the topological relationship model of vertices and planes is constructed. The data of single tooth is separated with separation algorithm, and using matrix transform, geometrical transformation of teeth model is realized. Then, after establishing frame curves, the 3-D solid modeling of corrected tooth socket is constructed. At last, using the SLA technology, the colophony model of the remedying device is produced.
Authors: Chun Ya Wu, Xian Li Liu, Y.J. Wang, P. Wang, Yi Zhi Liu
Abstract: Aiming at different ground surfaces of hardened bearing steel GCr15, this paper made experimental research on assessment method of surface roughness based on computer vision technology. Firstly, some pre-processing of the ground images should be carried out to eliminate noise and get more detail information, including image enhancement and median filtering. Then the method of power spectrum analysis transformed representation of processed image from spatial domain to frequency domain by adopting two-dimensional Discrete Fourier Transform. Gaining the mean power spectrum named E and its corresponding radius r, we made efforts to seek the direction in which the arithmetic average surface roughness Ra varied according to E and r. After that the variation rule can be regarded as an assessment basis of ground surface roughness.
Authors: Feng Jiang, Jian Feng Li, Fang Yi Li
Abstract: Design for assembly (DFA) has proved its success in manufacturing to face the market challenge. But the assembly process parameters were rarely concerned in the design for assembly. Aimed at this problem, an algorithm for design for automated assembly of circular parts was proposed. This algorithm can help designer to select the optimal process parameters, such as dimension tolerance of mating parts, location precision of assembly device and so on, subject to budgetary constraints. Finally a case is employed to explain the optimal course.
Authors: Qing Gao, Qin He Zhang, Shu Peng Su, Jian Hua Zhang, Rong Yu Ge
Abstract: In the past decade, artificial neural network(ANN) has been applied in Electrical discharge machining(EDM). However, most of them only discuss parameter prediction or optimization result, few tell how to improve generalization performance. In this study, machining process models have been established based on different training algorithms of ANN, namely Levenberg-Marquardt algorithm (LM), Resilient algorithm (RP), Scaled Conjugate Gradient algorithm (SCG) and Quasi-Newton algorithm(BFGS). All models have been trained by same experimental data, checked by another group data, their generalization performance are compared. Take LM as the example, some main factors that may influence generalization performance are discussed.

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