Abstract: A micro grooved finger has smaller bending stiffness and can be used to improve the
performance of some micro cantilever devices. The deflection and bending stiffness of a micro
grooved finger are discussed in this paper. An analytical model of the deflection is built up to study
the effect of the groove sizes on the bending stiffness and the deflection of the grooved finger. The
calculation of the analytical model is consistent with the simulation and experiment results. When the
grooves depth is 0.5 μm, the spring constant of grooved micro finger is 19.8% smaller than that of flat
finger without groove patterns. The spring constant of the finger decreases with the increasing of the
width and depth of the groove. A novel micro electric-thermal gripper is introduced based on the
grooved finger. It consists of four sub-cantilever beams arranged at the diagonal lines of the square
frame in the end of the main cantilever structure suspended from the silicon substrate, which
guarantees an effective contact by the four-point contact area on the top surface to grab object of
importance. The thermal expansion induced deflection makes the fingers moving vertically from an
‘open’ position to a working one. The grooved fingers help to decrease the bending stiffness of the
finger and increase the deflection and the initial gap. The simple fabrication process has a feasibility
of compatible and mass production.
Abstract: In view of the product shape prototype's information model, based on the fuzzy D-S
inference establishment product shape meaning matrix's design style description method,
determinates the product conventional shape meaning. Then, the shape description object's meaning
word is proposed based on the most superior fondness's meaning connection. Finally, the analysis is
carried on based on the design style space and the shape whole appraisal distribution map to the
product, established the shape meaning matrix to express as the product design style description
model computer formalization.
Abstract: Aramid fiber is one of the most promising materials used in secondary structure of the
airplane, which has many merits such as low density, abrasion resistance, impact resistance,
permanent flame retardance etc. Current research at home and abroad is mainly on the manufacturing
process, mechanical and electrical properties of aramid fibers while the sound absorption property
research is less. We prepared aramid micro-perforated composite materials according to the theory of
micro-perforated absorber, in order to test and analyse sound absorption properties of
micro-perforated sound-absorbing materials with different thickness, aperture, perforation ratio and
combined program by using acoustic standing wave tube measurement system. Experimental results
show that: the absorption effect of the Micro-perforated Panel Aramid Composite is obvious, in a
certain frequency; the absorption coefficient is greatly improved. The study offers a new method for
aramid fibers which could be applied in planes and cars.
Abstract: It is critical to control chip forming, regular curling and breaking in turning. One method
most commonly used is to make chips curl and break with chip-breaking grooves. Chip-breaking
groove designing is complex and affected by several factors. Cellular automata is especially used to
solve problems in complicated situation, hence this paper adopts cellular automata to design curves of
the grooves. After blending the curves through Pro/Engineer into part, an insert with
three-dimensional complex groove was developed with EDM. The results of cutting experiment
showe a great performance of the grooved insert in turning, reaching the expected goal, and
feasibility to design a three-dimensional complex groove insert with cellular automata as well.
Abstract: The processing of rough machining and semi-finishing of revolving body stone is studied,
according to the particularity of stone machining. Based on the study of processing, the system of
computer aided programming and simulation for the revolving body stone is mainly researched. This
system integrates the NC code automatic generation module and numerically controlled machining
simulation module and this system is able to verify the pre-existing NC code. Thus greatly improves
the efficiency and raises the quality.
Abstract: This paper proposed a new and effective parametric curve interpolation algorithm with
error compensation capability for high speed machining. The proposed algorithm is developed from
the first-order Taylor expansion interpolation algorithm and the speed-controlled interpolation
algorithm. It is also incorporated the geometry features of the machined curves, the dynamic
characteristics of machine tools and the adaptive error control. The proposed algorithm achieves high
surface accuracy and avoids feedrate fluctuations. Simulation results have demonstrated the
effectiveness and satisfactory performance of the proposed algorithm.
Abstract: In this paper, we investigated the knowledge modeling and proposed an ontology
description logic theory based on fuzzy interval in order to support the management and reuse of
design knowledge. We also established the methods to classify and represent the concept-design
knowledge and developed an ontology-based model presenting the design knowledge as well as a
model for modeling cycles. We further applied these methods and models to develop a specific
ontology-based design knowledge model and validated them in the management system of design
knowledge for the construction machinery.
Abstract: Fixtures are used to locate and constrain firmly a workpiece during machining operation.
Flexible and efficient fixturing has become an important issue in flexible manufacturing systems and
computer integrated manufacturing system. Locating planning is the basis of the fixturing design,
which has a direct influence on the quality of the clamping scheme and the machining quality of
workpiece. This paper presents a new approach for locating planning of workpiece. Firstly, it will
automatically select the primary locating surfaces with consideration of 5 influence factors:
constraint freedoms, surface feature, valid locating area, tolerance relationship and surface roughness.
Then the other locating surfaces are determined by retrieving similar workpieces under the guideline
of 4 locating methods which will make the best of already available locating planning. Finally the
optimal locator layout is fast achieved with GA with the goal of minimal locating tolerance.
Abstract: The part’s precision-machined quality of NC machining is influenced by the chord error
greatly during precision machining. The confined chord error Algorithm for Machining Complex
Parametric Curve is proposed for the complexity of the chord error. The information of the arc length
error is utilized to control the chord error of the interpolated point indirectly. The arc length error of
interpolated point is computed by Simpson expressions, the information of coordinate and the first
order derivative of interpolated point is computed by the interpolation algorithm, so the computed
difficulty is not increased greatly. The computed error of the algorithm is discussed and the
simulation example of NURBS curve proves that the destined precision of the chord error can be
satisfied by this algorithm.