http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yidong Bao (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
QuickForm Simulation System of Sheet Metal Forming with Trial-and-error Contact Algorithm
Bao Yidong,Liu Lei,Lu Yu,Chen Wenliang 한국소성가공학회 2011 기타자료 Vol.2011 No.8
The QuickForm numerical simulation system has been self-developed specially for sheet metal forming with complex geometries. In order to resolve the convergence problem of static implicit method due to the change of contact state, the uncoupling solution method of the non-linear differential equations is used in QucikForm system. The bending effect and drawing effect during forming procedure are separated into two independent processes in QuickForm system. During bending effect solution, the contact state between the blank nodes and rigid tools should be determined by accurate contact algorithm. A trial-and-error contact algorithm is used in the bending effect calculation process of QuickForm system. The contact procedure is carried out before the solving of bending effect FEM equations, and the contact conditions are treated as the boundary conditions of FEM equations. Numerical simulation results of complex part demonstrate the higher efficiency and accuracy of this contact algorithm and the proposed special purpose program.
-
Fast numerical simulation of sheet metal forming using the program QuickForm
Yidong Bao,Junwei Chen,Zhiguo Wang,Wenliang Chen,Wing Lee 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The fast numerical simulation system QuickForm has been self-developed specially for sheet metal forming with complex geometries. In order to resolve the convergence problem of static implicit method due to the change of contact state, the uncoupling solution method of the non-linear differential equations is used in QucikForm program. The bending effect and drawing effect during forming procedure are treated into two separate processes in QuickForm system, so this uncoupling solution has two basic steps. Firstly an approximate method named pre-stressed membrane element is used to achieve the intermediate configuration of sheet in this incremental step before incremental step iteration. The sheet shape of intermediate configuration depends on the current tooling position. Secondly the nonlinear material flow within this intermediate configuration is carried out, which means the nodes of deformed sheet can only slide on this form. The highly efficient iterative solver can be used to the solution of linear equations since the improved conditioning of the linear equations resulting from the uncoupling solution. Numerical simulation results of complex parts demonstrate the higher efficiency and accuracy of the proposed special purpose program.
-
Mesh Generation Based on Virtual Geometry
Peng Wei,Chen Wenliang,Bao Yidong 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Finite element mesh generation algorithm often requires the ability to abstract and modify the topology of a boundary representation model. A method based on virtual geometry for mesh generation is proposed to modify the model topology without changing the geometry of the model. By this method, a tool is given to adjust the model topology for optimal meshing, while leaving the geometry or shape of the model, and the accuracy of the resulting mesh in representing the model, unchanged. Our practical examples show that the proposed method is effective and reliable for mesh generation in molding analysis field.
-
Free-Form Surface Flattening Based on Rigid Registration and Energy Optimization
Peng Wei,Qiao Kai,Bao Yidong,Zhang Chaoyang,Ji Weixi 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.8
Fundamental technology of Computer Aided Design, free-form surface flattening is important for both practical and scientific point of view in mechanical engineering. This paper proposed a flattening algorithm by using a local rigid registration and a global energy optimization. Firstly, each 3D element is aligned to the plane by minimizing the distance between the original 3D element and its corresponding planar element. Then, a global optimization operator is used to stitch and optimize these best-aligned local elements by iteratively minimizing a quadratic energy function composed of linear elastic energy, which makes the internal force of the nodes reach the equilibrium state. The experimental results show that this method is stable and reliable, and can obtain good surface flattening effect under free boundary conditions.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
