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Zhou M.,Beihang University | Zheng G.,Beihang University | Luo Z.,McGill University | Chen S.,Shenyang Aircraft Industry Group Corporation Ltd.
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | Year: 2016

In order to recognize the rib feature in aircraft structural parts, a recognition and construction algorithm based on the constrained Delaunay triangulation is presented. First, according to the different machining methods between the real bottom plane and the flat rib as well as the similar geometric characters of these two features, the concept of generalized bottom plane is introduced to represent the real bottom plane and the flat rib. Moreover, a representation model of the rib feature is established for further recognition and construction. Second, the constrained Delaunay triangulation method is adopted to decompose the generalized bottom plane, recognize and distinguish it as the flat rib or bottom plane, and then extract the medial axis of the flat rib. Finally, the flat rib is divided as per the medial axis while the declining rib is recognized and constructed as a sub-feature of the generalized bottom plane. The validity and efficiency of this algorithm have been verified through examples. © 2016, Beijing University of Aeronautics and Astronautics (BUAA). All right reserved. Source


Zhou M.,Beihang University | Zheng G.,Beihang University | Chen S.,Shenyang Aircraft Industry Group Corporation Ltd.
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2014

To machine the various irregular residual areas left by pocket roughing, a spiral looping tool-path pattern is proposed and its generation method is established. Firstly, a concept of the generalized corner residual area (GCRA) is defined to represent residual corners and bottleneck areas uniformly. Secondly, according to bottleneck lines, the residual bottleneck area is subdivided to construct GCRA. Thirdly, an iterative method is adopted to generate the spiral looping tool-path based on the radial depth. Finally, an example is illustrated to validate that the proposed tool-path is available and effective. Source


Wang M.,CAS Shenyang Institute of Automation | Zhang H.,CAS Shenyang Institute of Automation | Zhang J.,CAS Shenyang Institute of Automation | Zhang X.,CAS Shenyang Institute of Automation | Yang L.,Shenyang Aircraft Industry Group Corporation Ltd.
Journal of Materials Engineering and Performance | Year: 2014

Friction stir lap welding of 7B04 aluminum alloy was conducted in the present paper, and the effect of pin length on hook size and joint properties was investigated in detail. It is found that for each given set of process parameters, the size of hook defect on the advancing side shows an "M" type evolution trend as the pin length is increased. The affecting characteristics of pin length on joint properties are dependent on the heat input levels. When the heat input is low, the fracture strength is firstly increased to a peak value and then shows a decrease. When the heat input is relatively high, the evolution trend of fracture strength tends to exhibit a "W" type with increasing the pin length. © 2014 ASM International. Source


Zhou M.,Beihang University | Zheng G.,Beihang University | Luo Z.,Beihang University | Chen S.,Shenyang Aircraft Industry Group Corporation Ltd.
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2015

In order to recognize the open-closed angle feature (OCAF) in aircraft structural parts, an approach based on the main face extension is presented. The method relies on the generalized pocket model. First, the faces of OCAF in the generalized pocket are recognized and the set of main faces are obtained. Then, the set of main faces and the set of related faces are extended to get the intact geometric attributes of OCAF. Meanwhile, the types of faces in the set of main faces are decided. Finally, according to the geometric attributes, the OCAF feature in generalized pocket is recognized and its relevance tree of a part is constructed. The validity and accuracy of this approach are verified through examples. © 2015, Institute of Computing Technology. All right reserved. Source


Yin H.J.,Shenyang Aircraft Industry Group Corporation Ltd. | Hu Y.,Shenyang Aircraft Industry Group Corporation Ltd.
Applied Mechanics and Materials | Year: 2013

This article describes the function of lightweight visualization tool-Product View. It introduces the application process of lightweight visualization tool-Product View in aircraft development from lightweight model assembly, lightweight model simulation, visual collaboration, collaboration between R & D, and human factor analysis, etc. Product View is a better collaborative communication tool between process design and design, design and technology in the aircraft development. There are not only high demands on the design and assembly, but also a lot of cooperative work between different equipments, equipments and staff, different staff in aircraft development[1]. In order to more efficiently share and use the digital product content created in this process, the demands on high-performance lightweight visualization tool become more and more strongly. Compatibility[2] and interactivity[3] are the two most important indicators when choosing a lightweight visualization tool. Variety of different tools may be used to create digital products during the design process, the compatibility between lightweight visualization tools and digital tools helps to enhance the user's experience. The interactivity of lightweight visualization tools is also indispensable, it can timely discover the problems of geometric dimensions, tolerance annotations, elements conflict, and interference, give a comprehensive evaluation of the design, and then provide an effective medium between engineering, manufacturing and other downstream participants. © (2013) Trans Tech Publications, Switzerland. Source

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