Fast Variational Design Based on a Master Model Generated From Part Model Series

Variational design is an efficient method for product design; statistics indicates that about 70% of product design is attributed to variational design. It is of vital importance for enterprises to achieve a complex new product through variational design while reusing the previous part model series, which can mostly improve their capability and efficiency of product design and development. Therefore, this paper puts forward an efficient variational design method based on a master model which is automatically generated from a part model series. Using the method, the designers can easily and efficiently create a new part from the master model only through feature selection and parameter modification. In this way, the work of the designers can be greatly alleviated and the design time can be greatly reduced. Experimental results show that the proposed method is effective.

Research on Bridge Damage-Reduction Seismic Performance with Variable Parameter Cable-Unseating Prevention Devices

The anti-seismic measures is effective in reducing the seismic damage of bridge, unseating prevention device is an effective structural measure to prevent collapse under unexpected earthquake, and its parameter will affect the function of unseating prevention devices. Based on relational design standards, the damage-reduction seismic performance of unseating prevention devices with variational design parameter have been analysis. The research results show that the unseating prevention devices with rational parameters can prevent collapse of the structure; the damage-reduction seismic performance of bridge was influenced by the cable rigidity and primary clearances. The unseating prevention devices will improve the seismic performance and integrality of bridge, but higher requirements have been proposed for the substructure of bridges.

Hexahedral Mesh Cutting Using Geometric Model With New Boundaries Well Matched

Hexahedral mesh generation is difficult and time-consuming. To avoid the complicated hexahedral mesh regeneration after each variational design, hexahedral mesh editing can be used. In this paper, an accurate hexahedral mesh cutting approach using geometric model is proposed, and the part of the geometric model inside the mesh model can be complex and arbitrary. In the approach, all the newly added geometric entities resulted from mesh cutting are first generated by performing the subtraction operation between the mesh model and the geometric model. Then, for each newly added geometric element, including point, edge and face, the mesh nodes that need to be moved onto it, are determined and repositioned with the mesh quality considered. To ensure the rationality of mesh nodes determination, for each newly added edge, the mesh nodes are identified using shortest path algorithm. Finally, the mesh elements that should not be in the resultant mesh model are deleted, Pillowing and Smoothing operations are further conducted to improve the mesh quality. Some preliminary results are given to show the feasibility of the approach.