The implicit parametric method was briefly discussed in this paper. An implicit parametric 3D solid model and a finite element (FE) model of a body-in-white (BIW) were built up by this method. Low order natural vibrat...
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ISBN:
(纸本)9783037857816
The implicit parametric method was briefly discussed in this paper. An implicit parametric 3D solid model and a finite element (FE) model of a body-in-white (BIW) were built up by this method. Low order natural vibration frequencies and modes, bending and torsional stiffness of the BIW were analyzed by FE calculation. A good agreement was acquired by comparing the prediction results with the test values. Results indicated that the implicit parametric model of the BIW established could be used for design and development of the BIW in concept design stage of the BIW.
This paper presents recent developments on implicit parameterization techniques(based on the software SFE CONCEPT) for shape optimization of vehicles in the context of modern modular car body *** of the implicit defin...
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This paper presents recent developments on implicit parameterization techniques(based on the software SFE CONCEPT) for shape optimization of vehicles in the context of modern modular car body *** of the implicit definition of the parameters complemented by the mapping and re-meshing techniques inherent to the software,a flexible and powerful optimization approach can be realized,where the connectivity is maintained,the accuracy of finite element computations assured and the efficiency improved via appropriate definition of design variables and optimization *** is first demonstrated on component and module level and finally confirmed by a full vehicle problem.
Most of recent research on carbody lightweighting has focused on substitute material and new processing technologies rather than structures. However, new materials and processing techniques inevitably lead to higher c...
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Most of recent research on carbody lightweighting has focused on substitute material and new processing technologies rather than structures. However, new materials and processing techniques inevitably lead to higher costs. Also, material substitution and processing lightweighting have to be realized through body structural profiles and locations. In the huge conventional workload of lightweight optimization, model modifications involve heavy manual work, and it always leads to a large number of iteration calculations. As a new technique in carbody lightweighting, the implicit parameterization is used to optimize the carbody structure to improve the materials utilization rate in this paper. The implicit parameterized structural modeling enables the use of automatic modification and rapid multidisciplinary design optimization （MDO） in carbody structure, which is impossible in the traditional structure finite element method （FEM） without parameterization. The structural SFE parameterized model is built in accordance with the car structural FE model in concept development stage, and it is validated by some structural performance data. The validated SFE structural parameterized model can be used to generate rapidly and automatically FE model and evaluate different design variables group in the integrated MDO loop. The lightweighting result of body-in-white （BIW） after the optimization rounds reveals that the implicit parameterized model makes automatic MDO feasible and can significantly improve the computational efficiency of carbody structural lightweighting. This paper proposes the integrated method of implicit parameterized model and MDO, which has the obvious practical advantage and industrial significance in the carbody structural lightweighting design.
We present a novel approach for representing and evolving deformable active contours by restricting the movement of the contour vertices to the grid lines of a uniform lattice. This restriction implicitly controls the...
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We present a novel approach for representing and evolving deformable active contours by restricting the movement of the contour vertices to the grid lines of a uniform lattice. This restriction implicitly controls the (re)parameterization of the contour and hence makes it possible to employ parameterization-independent evolution rules. Moreover, the underlying uniform grid makes self-collision detection very efficient. Our contour model is also able to perform topology changes, but - more importantly - it can detect and handle selfcollisions at subpixel precision. In applications where topology changes are not appropriate, we generate contours that touch themselves without any gaps or self-intersections.
We present a novel approach for representing and evolving deformable active contours by restricting the movement of the contour vertices to the grid lines of a uniform lattice. This restriction implicitly controls the...
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We present a novel approach for representing and evolving deformable active contours by restricting the movement of the contour vertices to the grid lines of a uniform lattice. This restriction implicitly controls the (re)parameterization of the contour and hence makes it possible to employ parameterization-independent evolution rules. Moreover, the underlying uniform grid makes self-collision detection very efficient. Our contour model is also able to perform topology changes, but - more importantly - it can detect and handle selfcollisions at subpixel precision. In applications where topology changes are not appropriate, we generate contours that touch themselves without any gaps or self-intersections.
The purpose of this paper is to study the platform performance optimization method based on implicit parametric ***,the body structure path is optimized based on topology optimization;Secondly,an approximate substitut...
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ISBN:
(纸本)9789819702510
The purpose of this paper is to study the platform performance optimization method based on implicit parametric ***,the body structure path is optimized based on topology optimization;Secondly,an approximate substitution model is constructed through machine learning to optimize the modal and stiffness *** collision performance is simultaneously optimized using black box optimization with modal and stiffness as the constraint condition;By overlaying and verifying the optimization scheme of modal and stiffness and collision,the final vehicle platform modal and stiffness performance can be improved by 5%-20%,and the SOB collision intrusion rate can be increased by about 50% or more,forming a vehicle platform performance optimization *** method can efficiently balance the relationship between modal,stiffness,collision,and other performance with weight,providing reference for subsequent platform performance development.
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