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.
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.
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.
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.
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.
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.
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.
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.
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.
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