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2004 Vol. 30, No. 04

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Development of manufacturing science and engineering and its up-to-date research directions
Liu Qiang, Li Zhehao, Tang Xiaoqing
2004, 30(04): 283-289.
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The development history of manufacturing technology was introduced briefly. Then the manufacturing science and engineering, as one subject of science, was investigated in its forming, development and trends. Four parts of the manufacturing science and engineering, the fundamental theory of manufacturing, the advanced manufacturing technology, the novel interdisciplinary manufacturing branches and the engineering applications of manufacturing technology, were suggested as the content of the subject. The features of the subject were summed up as the systematicness, the complexity, the interdisciplinarity, the innovativeness and the practicality, etc. Finally, the eleven up to date or highlighted research directions were presented in the manufacturing science and engineering.
Development of advanced manufacturing technology
Yao Fusheng
2004, 30(04): 290-295.
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Due to the development of technology and the infiltration of new technology from different subjects, previous manufacturing technology has changed to modern manufacturing technology. A detailed introduction and analysis of the development of advanced manufacturing technology, mainly on designing and prototyping, was given, and the characteristics of advanced manufacturing technology different from that of previous manufacturing technology and some developing trends of the field were also pointed out.
Principle of precision forming for sandwich panel of large antenna reflector
Zhou Xianbin, Chen Lianfeng, Li Dongsheng
2004, 30(04): 296-300.
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To solve precision forming problem of the antenna panels with large non-developable double-curvature surface, the precision forming principle was proposed, based on "discrete nails die, vacuating press, honeycomb sandwich, stressrelease in-plane, and springback compensation". The problem of rectangle thin plate with free edges and constrained at arbitrary inner points with large deflection was discussed. An explicit/implicit hybrid FEM method was used to simulate the forming process and springback to determine the processing parameters. The slotting and notching techniques were developed for releasing the compression stresses of panel in order to ensure good fittability of panel on nails die. The compensation of springback has carried out by modifying discrete nails die, the adjusting coefficient of nail-head height was obtained by minimizing the shape-error between modified surface and simulation shape. The CAE system for precision forming of antenna panels was developed and was used successfully in several actual projects of compact antenna test range and millimeter-wave antenna. The precision of reflector panel can reach below 25 μm.
Research on IEEE 1394-based virtual multi-MAC-supported fieldbus
Liu Chibin, Huan Ji
2004, 30(04): 301-304.
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In order to solve the performance and efficiency problem in a bus system with different types of devices, a new virtual multi-MAC(media access control)-supported industrial fieldbus protocol was presented based on IEEE 1394. A virtual MAC sublayer on the IEEE 1394 protocol layers was designed. An additional procedure was needed to configure nodes' MAC-functions. Using the isochronous and asynchronous channels the communication based on TDMA, arbitration, polling, and token-passing was supported.
Design on the control of robot system for machining large irregular curved face
Yuang Yuang, Wang Zhili, Zhu Ming, Zong Guanghua
2004, 30(04): 305-307.
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A system designed for machining regular graphic units on irregular complex curved surface was presented,and this system includes a 3-DOF right-angle coordinate robot and a 2-DOF positioner. The software for the system was designed, in which the functions of the engineering database management,generating the job sequence, planning the cutting path, off-line programming and simulation, real-time monitoring and error handling, predicting for the work condition and error compensation were realized. It was proved by a series of tests that the control software can control the system accurately, effectively and in real-time.
Analysis on liquid dispensing principles of robot for fabricating biochip
Zhao Ran, Bi Shusheng, Zhou Qiang, Zong Guanghua
2004, 30(04): 308-311.
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In order to solve the problem of estimating the sample spots diameters in fabricating biochip, the liquid dispensing principles were analyzed. The affections to the sample spots diameters by the factors, such us the tip diameters, printing velocities, and liquid characters, were tested and discussed. According to the experimental datum, the estimation formula of sample spots diameters was put forward. The research result is helpful to select correct parameters in fabricating biochip.
Dexterity analysis of robot for neurosurgery
Xing Hongguang, Wang Lihong, Zhang Yuru
2004, 30(04): 312-315.
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Minimal invasive surgery assisted robot was developed in Robotics Institute in Beijing University of Aeronautics and Astronautics. Based on the requirement of neurological stereotactic surgery, dexterity of the robot was analyzed. Firstly, using concept of service sphere and service section, definition of dexterity was proposed at any point inside the workspace of the five degree-of-freedom robot; then, analysis method of workspace dexterity was proposed. Dexterity distribution within the workspace was given using numerical analysis and graphical display, and the result was verified through experiment on the robot physical prototype. With the help of dexterity distribution in workspace, reliable reference can be supplied for surgery operation planning.
Quality management information system for cooperative manufacturing
Lü Qingsong, Qingling Tang
2004, 30(04): 316-320.
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To solve the problem of quality management in cooperative product manufacturing, a model of cooperative quality management information system based on Intranet/Extranet/Internet and ASP application model was proposed, which can bean information system platform for product quality management in cooperative manufacturing. The system architecture, function model, application system integration solution and key technology of the system were investigated. The system is able to benefit the quality management of modern enterprises.
Parametric design of turbine blades based on feature modeling
Song Yuwang, Xi Ping
2004, 30(04): 321-324.
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Considering the geometric features of the air-cooled turbine bladesof the aircraft engines, the methods to sort the features in the parametric modeling of the blades were advanced. A parametric design system was developed with feature-based modeling technology. The development of the parametric module wasinstanced by the parametric design of a straight-back air-cooled turbine blade, which is the basis of the parameterization of the configuration accessory in the aircraft engines.
Wavefront algorithm for triangulation of scattered data
Xiong Xinbin, Ning Tao, Tang Rongxi
2004, 30(04): 325-328.
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An approach of wavefront algorithm for automatic triangulation was presented. The first wavefront edge was constructed from an arbitrary point along with its adjacent points, then an appropriate third point was chosen to form a well-shaped triangle. By repetitively updating wavefront and searching new matching point, new triangles were generated sequentially until the triangulation process was finished. Results oftriangulation were recorded in winged-edge structure.
Algorithm for rapid slicing STL model
Zhao Baojun, Wang Su, Chen Wuyi
2004, 30(04): 329-333.
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The advantage and disadvantage of existing slicing algorithms for stereolithography model were analyzed, and an algorithm based on the grouping matrix and the active triangle table was developed. In the algorithm, the grouping matrix and the active triangle table were established according the minimum and maximum z coordinates of the triangular facets, which reduce the times of traversing and sorting for the triangular facets and the times of intersecting with the slicing plane in the slicing processes, and which simplify the process of constructing the slice contour. By this method, the efficiency of the slicing algorithm were increased effectively．
Development on numerical control testing system for skin stretch-forming and analysis of accuracy
Bai Di, Zhou Xianbin, Li Dongsheng
2004, 30(04): 334-338.
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To study the deformation behavior of aircraft skin parts during the process of stretch-forming, numerical control testing system was established on the basis of universal three-axes loading machine by analyzing the characteristicof skin stretch-forming technique. Velocity control of hydraulic cylinders and displacement synchronous control of same axial hydraulic cylinders were realized by introducing the improved digital proportional, differential, intergral (PID) control algorithm and the system is competent for most of stretch-forming test. Testing result shows that the control precision of testing system is well and the performance is reliable, it provides the experimental basis for the further research.
Demonstration of an plane electrically actuated brake
Li Hongguo, Wang Kai, Wu Ruixiang, Zhou Shimin, Huang Weiming
2004, 30(04): 339-343.
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A primary design of electrically actuated brake system was presented, and give it-s control theory, simulation and analysis. The design includes servo motor control and construction; The new control theory adopt fuzzy control; In order to analyze the new control theory and study the working situation at all kinds of status, Simulation and analysis based on this control theory were provided;To set the unit parameters and conditions in analysis,analytical consequences were calculated quickly,and it will aid actual design of new unit.
Fuzzy fault tree analysis on safety of robot for wall cleaning
Li Xijiang, Liu Rong, Zhang Houxiang, Zong Guanghua
2004, 30(04): 344-348.
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The fault tree analysis method was introduced to cope with this problem. Failure tree mode was set up based on robot design scheme and failure analysis. The property and quality of failure tree model was analyzed with fault tree analysis method. To solve the problem of insufficient failure rate of root and mid events , fuzzy theory was introduced into the fault tree analysis method. The failure rate of root events was described as fuzzy number. the fuzzy failure rate in the system was calculated according to fuzzy calculation rule.
Research on collision-free motion planning of dual redundant manipulators
Jia Qingxuan, Zhan Qiang, Sun Hanxu
2004, 30(04): 349-352.
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Collision-avoidance based motion planning of dual redundant manipulators was analyzed and researched. A method based on distance function was improved and simulation results show the feasibility and usefulness of the work.
Principle of software commutation and application in vector control of AC linear motor
Fan Feng, Liu Qiang
2004, 30(04): 353-357.
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The approach of implementing the field-oriented vector control to AC linear motor was studied based on the analysis of the vector control principle. An experimental system of linear motor control system was built for testing by use of PC and special AD/DA board as the control system hardware. The control program was developed in C language, which includes initializing module for the initial parameter calculation, real-time interrupt service module for the feedback sampling and vector control calculation and handle of I/O, and other interface modules, etc. The experiment pictures of the positions of the motor in the initialization stage, the linear velocity and the positions of the motor in position closed-loop state, etc, were shown separately. The testing results demonstrate that the approach of the field-oriented vector control developed for an AC linear motor driving table is valid and realizable.
Development of the fieldbus technology
Xia Jiqiang, Xing Chunxiang, Geng Chunming, Man Qingfeng
2004, 30(04): 358-362.
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A brief review of fieldbus standard was given. In our country, controller area network, foundation fieldbus, profibus and devicenet were prevalent fieldbus technologies in the field of industry process control. Development trends of these fieldbus technologies in recent years were introduced. The emphasis was placed on the competition in industry ethernet. Current situation and characteristic of fieldbus were analyzed to present some suggestions in fieldbus application.
Modeling and image processing in infrared thermographic NDT of composite materials
Guo Xingwang, Vavilov V, Guo Guangping, Shao Wei, Liu Yingtao
2004, 30(04): 363-369.
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Infrared thermographic non-destructive testing(IT NDT) was increasingly used in the inspection of composite materials due to large surface,rapid and noncontact testing capabilities. The modeling and thermal image processing of the IT NDT of carbon fibre reinforced plastic(CFRP) were researched here. A new mathematical model was proposed for the CFRP reference samples with Teflon inserts, and the simulation was carried out; The causes of the phenomenon that the temperature on defects appears colder than the background were analyzed; The discrepancy between the experimental and the expected results was overcome. Many advanced data processing methods in the inspection of CFRP samples were used to deal with the infrared image sequences. Several processing algorithms were statistically evaluated to demonstrate that the Fourier transformation and the correlation technique can provide the highest values of signal-to-noise ratio.
Research and application of progressive coding of 3D model and streaming transformation
Li Gongli, Huang Yuyu
2004, 30(04): 370-374.
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A 3D model simplification and coding algorithm, which is suitable for the network transformation according to the actual requirement, was described. Some existing simplification algorithms were compared, and the shortcomings were analyzed. Based on the triangle meshes, a simple and efficient algorithm was developed. Due to the progressive coding and streaming technology, files encoded by this algorithm can be easily transferred through the network. Finally, a conclusion and some pictures of this algorithm's result were presented.
Research of human-seat dynamics model and ejection seat dynamic comfort
Wang Chunjie, Zeng Fuming
2004, 30(04): 375-378.
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Dynamic seat comfort is an emphases and difficulty of comfort seat research. In order to research dynamic comfort seat, nine degree of free (9DOF) human-seat system dynamics model was built, then mode analysis of human-body model and frequency response analysis of human-seat system was made in computer. The response of human body vibration was studied in seat dynamic speciality. It can be used foundation for the preventive method and vibration comfort evaluation criterion of ejection seat.
Research on forming superimposition method of large tesla transformer inner cores
Jiao Hongjie, Qi Bojin, Sun Changming, Gui Fusheng
2004, 30(04): 379-382.
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Based on the basic requirements of cores properties used in tesla transformer ,and the physical and mechanical performance of Fe-Si steel belt, resin glue and piece, formula of Fe-Si steel belt forming section curve used in inner cores was developed .Structure of inner cores and piece forming basic unit were analyzed in detail. Finally,forming superimposition method and distributing law of Fe-Si steel belts were presented.
Experimental research of dynamic characteristics for the cartesian-coordinates assembly robot
Li Xiuqin, Zhang Yidu
2004, 30(04): 383-386.
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The dynamic characteristics of the cartesian-coordinates assembly robot were tested using the experimental analysis method. The vibration wave and attenuation time of the terminal of the robot were measured with and without loads. The analysis focuses on the vibration models of typical positions within the working scope. Several suggestions were made on how to improve the dynamic characteristics of the robot.
Study on the wettability of Ti-based brazing filler on titanium-aluminides
Fan Kun, Kang Hui, Qu Ping, Zhu Ying
2004, 30(04): 387-390.
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The wettability of 37.5Ti-37.5Zr-15Cu-10Ni brazing filler metal on titanium-aluminides were investigated by vacuum brazing at the temperature of 910℃ and 1 000℃.The results show that the higher the joining temperature is, the better wettability the filler metal has. Detail analysis shows that the improvement of wettability is not only caused by the surface tension decrease at high temperature, but also the reaction between the base metal and filler metal.
Estimating of composite process capability for conceptual process planning
Zheng Lianyu, Wei Li, Qian Gui-sheng
2004, 30(04): 391-394.
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It is crucial to estimate the process capability of process alternatives selected in the macro-level conceptual process planning during early stage of product development. The classical process capability index is only suitable to estimate micro-level single quality characteristic possessing statisticalnormal distribution in batch production scenario. Based on the idea of estimating the inputs (process elements) performance rather than the outputs (quality characteristics) ones of manufacturing system, a generic function for measuring the capability of process element was put forward and then the estimation formula of composite process capability index was developed. This index was able to measure the whole quality level of a manufacturing system with multiple process elements and multiple quality characteristics. A case study concerned with conceptual process planning for a spacecraft frame part was used to illustrate the validity of the estimation formula of composite process capability. The proposed composite process capability index was used as a effective tool to approximately estimate and select the optimal process alternatives during conceptual process planning in the early stage of product development.

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