Platform-Based Evolution and Optimization of Vehicle Body in White Using Implicit Modeling Technology

2018 ◽  
pp. 193-205
Author(s):  
Zhongcai Qiu ◽  
Bo Liu ◽  
Ke Wang ◽  
Jinsheng Zhang ◽  
Bo Lu ◽  
...  
Keyword(s):  
Vehicle Body ◽  
Modeling Technology ◽  
Body In White ◽  
Implicit Modeling

Experimental Analysis of Static Stiffness for Vehicle Body in White

2012 ◽  
Vol 248 ◽  
pp. 69-73 ◽  
Author(s):  
Shu Ming Chen ◽  
Xue Wei Song ◽  
Chuan Liang Shen ◽  
Deng Feng Wang ◽  
Wei Li
Keyword(s):  
Test Bench ◽  
Bending Stiffness ◽  
Torsional Stiffness ◽  
Vehicle Body ◽  
Torsional Angle ◽  
Static Stiffness ◽  
Torsional Deformation ◽  
Automotive Body ◽  
Body In White ◽  
Stiffness Characteristics

In order to know the static stiffness characteristics of the vehicle body in white, the bending stiffness and torsional stiffness of an automotive body in white were tested on a test bench of the static stiffness of an automotive BIW. The bending stiffness and bending deformation of the bottom of the BIW were determined. Also, the torsional stiffness and torsional deformation of the bottom of the BIW were obtained. The fitting curves and equations between loading torque and torsional angle were acquired at clockwise and counterclockwise loading, respectively.

Optimization of the Global Static and Dynamic Performance of a Vehicle Body by Means of Response Surface Models

2012 ◽  
Author(s):  
Pavlina Mihaylova ◽  
Alessandro Pratellesi ◽  
Niccolò Baldanzini ◽  
Marco Pierini
Keyword(s):  
Response Surface ◽  
Dynamic Performance ◽  
The Body ◽  
Vehicle Body ◽  
Fe Model ◽  
Structural Modifications ◽  
Response Surface Models ◽  
First Choice ◽  
Surface Models ◽  
Body In White

Concept FE models of the vehicle structure are often used to optimize it in terms of static and dynamic stiffness, as they are parametric and computationally inexpensive. On the other hand they introduce modeling errors with respect to their detailed FE equivalents due to the simplifications made. Even worse, the link between the concept and the detailed FE model can be sometimes lost after optimization. The aim of this paper is to present and validate an alternative optimization approach that uses the detailed FE model of the vehicle body-in-white instead of its concept representation. Structural modifications of this model were applied in two different ways — by local joint modifications and by using mesh morphing techniques. The first choice was motivated by the strong influence of the structural joints on the global vehicle performance. For this type of modification the plate thicknesses of the most influent car body joints were changed. In the second case the overall car dimensions were modified. The drawback of using detailed FE models of the vehicle body is that they can be times bigger than their concept counterparts and can thus require considerably more time for structural analysis. To make the approach proposed in this work a feasible alternative for optimization in the concept phase response surface models were introduced. With them the global static and dynamic performance of the body-in-white was represented by means of approximating polynomials. Optimization on such mathematical models is fast, so the choice of the optimization algorithm is not limited only among local-search strategies. In the current study Genetic Algorithm was used to increase the chances for finding better design alternatives. Two different optimization problems were defined and solved. Their final solutions were presented and compared in terms of structural modifications and resulting responses. The approach in this paper can be successfully used in the concept phase as it is fast and reliable and at the same time it avoids the problems typical for concept models.

A NEW MINIMAL PART BREAKUP BODY-IN-WHITE DESIGN APPROACH AND OPTIMIZED MATERIAL MAP STRENGTH ASSESSMENT

2016 ◽  
Vol 78 (7) ◽  
Author(s):  
Mohan Rajasekaran ◽  
V. Hari Ram ◽  
M. Subramanian
Keyword(s):  
Upper Body ◽  
Vehicle Body ◽  
Load Path ◽  
Strength Assessment ◽  
Stiffness Analysis ◽  
Body In White ◽  
Weight Design ◽  
Efficient Option ◽  
Torsion Stiffness ◽  
Better Than

Body-in-White (BIW) is the Car Body without additional subsystems. Automakers are trying hard to reduce the mass of the vehicle body. The efficient option is to use multi materials and minimal number of parts in the BIW, in order to meet the stiffness requirements considering different load cases. Bending Analysis and Torsion Stiffness Analysis was performed to understand and assess the structural performance of the BIW. This paper presents the new BIW architecture with minimal number of parts, with an effective load path for the Structural and Crash load cases. Structural bending and torsion stiffness of the BIW were performed to evaluate the stiffness of the BIW to meet the passenger segment car.  The methodology of using different materials for upper and under body has been investigated with the alternatives as Aluminium and Magnesium. BIW was analysed with Steel under body and Magnesium or Aluminium upper body. The Torsion stiffness of Steel/Magnesium BIW was found to be better than Steel/Aluminium BIW. The design concept with Steel underbody and Magnesium upper body was giving lighter weight design with better structural stiffness as compared to the Steel/Aluminium body. This approach of modifying the materials for the upper body of the BIW can be considered as lightweight solutions in other Conceptual BIW designs.

Topology Optimization of Electric Vehicle Body in White Based on SIMP Method

2011 ◽  
Vol 308-310 ◽  
pp. 606-609 ◽  
Author(s):  
Shu Yang ◽  
Chang Qi ◽  
Ping Hu ◽  
Zhi Yong Wei ◽  
Ying Li Wang
Keyword(s):  
Topology Optimization ◽  
Geometric Constraints ◽  
Vehicle Body ◽  
Numerical Instability ◽  
Static Loads ◽  
Simp Method ◽  
Proposed Model ◽  
Body In White ◽  
Braking Process ◽  
Moment Load

Based on Solid Isotropic Microstructure with Penalization (SIMP) method, a mathematical model for topology optimization of EV is proposed, which has design objective as minimizing compliance, with volumetric and geometric constraints. To make results more engineering value, the BIW optimization of EV takes into account not only the static loads, but also the torsion load in turning and moment load in braking process of EV. A number of implementation aspects in solving the numerical instability problem generated in optimization process are discussed, including checkboard patterns and mesh-dependency. Topology optimization of EV body in white with geometry and volumetric constraints is conducted, showing effectiveness of the proposed model.

Monocoque Vehicle Body-In-White Life Evaluation Using Torsion Endurance Test on Rig

2016 ◽  
Author(s):  
Mahalingesh Burkul ◽  
Hemant Bhatkar ◽  
Mahesh Badireddy ◽  
Narayanan Vijayakumar
Keyword(s):  
Vehicle Body ◽  
Endurance Test ◽  
Life Evaluation ◽  
Body In White

Decomposition-Based Assembly Synthesis of a 3D Body-in-White Model for Structural Stiffness

2003 ◽  
Author(s):  
Naesung Lyu ◽  
Kazuhiro Saitou
Keyword(s):  
Pareto Front ◽  
Element Model ◽  
Vehicle Body ◽  
Structural Stiffness ◽  
Multi Objective Genetic Algorithm ◽  
First Case ◽  
Trade Offs ◽  
Body In White ◽  
Minimum Distortion

This paper presents an extension of our previous work on decomposition-based assembly synthesis for structural stiffness [1], where the 3D finite element model of a vehicle body-in-white (BIW) is optimally decomposed into a set of components considering the stiffness of the assembled structure under given loading conditions, as well as the manufacturability and assembleability or components. Two case studies, each focusing on the decomposition of a different portion of a BIW, are discussed. In the first case study, the side frame is decomposed for the minimum distortion of front door frame geometry under global bending. In the second case study, the side/floor frame and floor panels are decomposed for the minimum floor deflections under global bending. In each case study, multi-objective genetic algorithm [2,3] with graph-based crossover [4,5], combined with FEM analyses, is used to obtain Pareto optimal solutions. Representative designs are selected from the Pareto front and trade-offs among stiffness, manufacturability, and assembleability are discussed.

A structural analysis of vehicle body-in-white using a substructuring technique

2007 ◽  
Vol 221 (3) ◽  
pp. 157-164
Author(s):  
B-G Kim ◽  
J-I Lee ◽  
T-J Chung
Keyword(s):  
Structural Analysis ◽  
Complex Systems ◽  
Mechanical Systems ◽  
Vehicle Body ◽  
Structural Performance ◽  
Assembly Model ◽  
Body Design ◽  
Body In White ◽  
Substructuring Techniques

A great deal of effort have been invested in improving the structural performance and feasibilities of mechanical systems, which are composed of many components. In order to analyse the complex systems, the substructuring techniques based on the behaviour of each component can widely be used in the assembly model that each component is initially incompatible and needs the feasible responses of components. In this paper, this technique is applied to the vehicle body design, and their feasibilities are verified.

The Concept modeling method: An approach to optimize the structural dynamics of a vehicle body

2020 ◽  
Vol 234 (13) ◽  
pp. 2923-2932 ◽  
Author(s):  
Mohammad Fard ◽  
Jianchun Yao ◽  
Richard Taube ◽  
John Laurence Davy
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Dynamics ◽  
Element Model ◽  
Modeling Method ◽  
The Body ◽  
Vehicle Body ◽  
Concept Model ◽  
Body In White ◽  
Concept Modeling

Although the concept modeling method has already been proposed in the literature, there is still very limited knowledge about the validation and the application of this method for vehicle body design. This paper substantially increases this limited knowledge by developing a concept model for predicting and optimizing the structural dynamics of a vehicle body-in-white and validating this concept model against a detailed finite element model. The geometry and parameters of the concept model are extracted from its detailed finite element model. The major members and panels of the detailed finite element model are replaced by their equivalent beam and shell elements models. The joints of the concept model are represented by stiffness and mass matrices extracted from the detailed finite element model using the Guyan Reduction Method. The developed concept model is validated by comparing its structural dynamics, including the resonant frequencies and the vibration mode shapes, with the original detailed finite element model and the experimental results. The simplicity and small size of the concept model enable it to easily enhance the structural dynamics of the body-in-white by optimizing the cross-sections of the load-carrying members of the structure. The optimization in this case increased the resonant frequencies of the body-in-white while reducing the total mass by about 6 kg. The results prove that the concept modeling method can significantly enhance the body-in-white structural dynamics by reducing the complexity of the model and allowing the focus for the optimization to be on the main members of the structure at the development stage when the final design parameters are not well known and have not been fixed.

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