Papers by Keyword: Model Reconstruction

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Authors: Yong Gang Kang, Fei Yan Guo, Ting Xu, Jie Huang, Cong Ren
Abstract: In order to include the physical deformation of the large thin-walled structure in the subassembly simulation process in aerospace, a new method based on model reconstruction was proposed. Firstly, finite element method is applied for calculating the deformation of the structural parts according to different assembly status with certain temperature and stress field. Based on the actual deformation data of the surface, some reference point was selected and the method of bicubic B-spline surface interpolation is selected to reconstruct the above surface, and to express the deformed structural parts. Based on physical deformation, a compensating method is proposed to amend assembly path in corresponding assembly process with the constructed model. Under the DELMIA virtual environment with the real, the simulation method has been put in to use on aircraft sidewall panel assembly, and the validity of the method is verified experimentally.
Authors: Hong Bo Lan, Yu Cheng Ding, Jun Hong, B.H. Lu
Abstract: This paper proposes a novel integrated modeling method based on cross-sectional imaging system which can implement the rapid and low-cost development for various engine cylinder bodies. The integrated modeling method which involves four steps: object pre-processing, cross-sectional image acquisition, CAD model reconstruction and redesign, is presented. Furthermore, an engine cylinder body was used to demonstrate the application of the integrated modeling method. The integrated modeling method proposed is characterized by simple process, short design cycle, and low-cost. It is particularly suitable for the 3D CAD modeling of an object with complex external and internal features. As a result, the method offers a good solution to implement the CAD modeling for a variety of complex objects with undercuts, hidden and internal features.
Authors: Da Peng Li
Abstract: In this paper, application of coordinate measuring machine(CMM) in reverse engineering(RE) of product was introduced. Reverse engineering had become a viable method to create a digital model of an existing physical part and to duplicate it. The reverse engineering process involves measuring an object,reconstructing its point cloud as a digital model and rapidly machining it. Application of obtaining point cloud using CMM was presented in reconstructing the digital model of a shoes tree. Rapid duplicate of a severely worn cam of textile machinery was realized by contact measuring profile points using CMM. Reconstructing the digital model and locally modifying the computer model in computer aided design (CAD) software. Finally, numerical control program was finished in computer aided manufacturing (CAM) software. Automatic measurement close freeform curve function of CMM decreased the workload of picking up data of cam profile. Experimental results showed using CMM can greatly save time and alleviate intension of labour.
Authors: Dong Zhang, Teng Huang, Jing Cao Song
Abstract: This paper presents a method for automatic CAD model reconstruction from 3D laser scanning data. 3D laser scanning is a surveying instrument integrated with various kinds of new high technologies, which operates by non-contact high speed laser measurement. The whole process includes data capturing, noise reduction, sub-sampling and surface reconstruction. Modeling accuracy is analyzed afterwards and finally comes to a conclusion that modeling from 3D laser scanning has a great value in virtual reproduction of the objects. Result shows the efficiency of the method addressed in the paper to mode objects.
Authors: Tie Li Ye, Lu Ling An, Li Gao, Qing Liang Zeng
Abstract: Constraint-based model reconstruction is one of the key research problems in recent reverse engineering. Surfaces of structural parts are mostly quadratic and have mutual constraints. Aiming at this feature, the paper proposes a method for conducting constraint-based synchronous fitting on multiple surfaces. Synchronous fitting is carried out through constraint optimization method, the constraints among surfaces can be maintained and the original design intents incarnated.
Authors: Rui Zhang, Hai Bao Liu, Si Hua Zhang, Gui Yin Zeng, Jian Qiao Li
Abstract: The ostrich foot toenail plays a crucial role in the process of ostrich foot traveling on sand. 3D laser scanner was used to measure the three-dimensional point clouds of ostrich foot toenail surface morphology, and the three-dimensional model of ostrich foot toenail was reconstructed by using reverse engineering technology. The finite element analysis in the interactions between ostrich foot toenail and sand was implemented by Abaqus and Hypermesh. The quasi-static analytical results of ostrich foot toenail inserting the sands showed that the groove structure of the toenail had a better sand fixation effects, the tiptoe structure was conducive to insert into the sands, and the inverted triangular structure of the toenail had the weak disturbance on the sands which produced the less resistance of the toenail inserting the sands. According to the velocity and the stress fields in the process of the ostrich foot toenail dynamically traveling on sand, ostrich foot toenail tiptoe could help to improve the thrust of traveling on sand, the groove area of the toenail played the effects of sand fixation and flow limitation in the process of ostrich foot toenail traveling on sand. Keywords: ostrich foot toenail, reverse engineering, model reconstruction, finite element simulation, sand fixation and flow limitation.
Authors: Bi Hong Lu, H.P. Zheng
Abstract: As a new for heavy-railway vehicle connecting device, drawbar can eliminate connective gap and improve dynamic performance of the train obviously as it is well interchangeable, simple structure, easy manufacture, convenient maintenance, mature technology, high reliability, and widely applied abroad. Through the research on reverse engineering of foreign drawbar, authors present data collecting method based on the coordinates measuring machine (CMM) and data preprocessing by Imageware software, which including noise points removal, data alignment, simplification, sorting and benchmark transformation. Converting points cloud data by Pro/E independent geometric module, 3D models based on features and constraints were reconstructed, which support the redesign of parts and their manufacturing analysis. The outcome of the paper provides effective ways in terms of drawbar techniques digesting and absorption, and also supports innovative design of new products.
Authors: Peng Xin Liu, Xuan Liu, Su Chang Ma, Li Jie Wang
Abstract: This paper introduces a novel modeling method using points acquired by a touch probe on a coordinate measuring machine and an optical scanner. An improved iterative closet point algorithm is adopted in order to transform the optical scanning data and the high precision points captured by a touch probe into a common coordinate system. A data merging method is also used to keep the high precision of feature surfaces and then unified into a precise 3D model. Experimental results demonstrate the efficiency of the presented method, which enhances the flexibility of digitization while maintaining the accuracy of feature surfaces.
Authors: Zhi Guo Yang, Shui Yuan Tang, Jian Hua Zuo, Hong Li Fan, Lian Hong Wang, Zhong Hua Jian
Abstract: 3D CAPP has become trend. Based on recognition of manufacturing features, the design model is reconstructed. First, the features of the engine case are classified. The workflow of reconstruction is put forward. Then, the detail ways to identifying manufacturing features are illuminated, and the functions are listed. The design model is reconstructed by redefining geometric and no-geometric information, including surfaces, holes, slots, text, sizes, and so on. The model of the engine case is reconstructed in the developed system.
Authors: Qing Xiang Wang, Hong Mei Zhang, Hong Nian Cai, Qun Bo Fan
Abstract: Co-continuous ceramic composites have a complicated topology structure which makes it much more difficult for finite element model reconstruction. In this paper, the two-dimensional co-continuous ceramic composites finite element model is reconstructed by a modified quartet structure generation set method which modified the generation parameters based on quartet structure generation set (QSGS) method, and a numerical simulation at high strain rate is accomplished. The content mainly contains: (1) The distribution features of metal phase and ceramic phase of real co-continuous ceramic composites SEM image is calculated by mathematical statistics to determine the parameters that control the reconstruction such as volume fraction, core distribution probability and directional growth probability; (2) Two phase volume fraction and 2-point correlation function of the reconstructed finite element model is calculated as the quality assessment parameters, which verify the reconstructed finite element model are in allowable error range compared with the real SEM image; (3) Numerical simulation at high strain rate is carried out using the reconstructed finite element model. The failure behavior of co-continuous ceramic composites at high strain rate is analyzed, validates the reconstructed finite element model meets the requirements of numerical calculation.
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