Component sensitivity analysis and lightweight design for static and dynamic stiffness of body-in-white structure(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年06期
- Page:
- 111-117
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Component sensitivity analysis and lightweight design for static and dynamic stiffness of body-in-white structure
- Author(s):
- LI Zhao-kai; YU Qiang; LI Yi-wen; ZUO Wen-jie
- 1. School of Automobile, Chang’an University, Xi’an 710064, Shaanxi, China; 2. China FAW Co. Ltd. R&D Center, Changchun 130021, Jilin, China; 3. School of Mechanical Science & Engineering, Jilin University, Changchun 130022, Jilin, China
- Keywords:
- automobile engineering; sensitivity analysis; lightweight design; body-in-white; static and dynamic stiffness
- PACS:
- U463.82
- DOI:
- -
- Abstract:
- In order to point out the direction of structural modification in lightweight design of automotive body-in-white (BIW) structure, sensitivity information which is widely used in each iteration of structure optimization was analyzed. To establish a parameterized finite element model of BIW structural component, the method of sharing design variables between all plate elements of each metal component was employed. By defining the external load, function of finite element node displacement and the function of finite element modal equation eigenvalue respectively, and by solving derivation of multiple compound function, models of static torsional stiffness, static bending stiffness, and dynamic frequency stiffness of auto-body were established respectively. The sensitivity information of auto-body’s static and dynamic stiffness subjected to plate thickness was derived. The method of adjoint variable sensitivity was adopted with regard to solving the problem that number of displacement responses was far less than the number of design variables in the expression of static bending and torsional stiffness. Firstly, the sensitivity information of BIW was obtained, and then the plate thicknesses were modified according to the sensitivity queue. The results show that the obtained displacement sensitivity can further improve analysis efficiency. Plate thicknesses of six components increase slightly, while those of the other five components decrease greatly. Besides, the torsional stiffness, bending stiffness, first-order, second-order, third-order frequency and dynamic stiffness increase, while the mass of BIW declines. Compared with the finite difference method, this method has higher accuracy and efficiency, and also is advantageous to obtain auto-body structure with high stiffness and lightweight effect.
Last Update: 2016-12-02