Quasi-Static Structural Optimization of an Automobile Roof Structure using the Enforced Displacement Method: A Preliminary Study
- Authors
- 박경진
- Issue Date
- 29-Jul-2016
- Publisher
- Korean Society of Mechanical Engineers
- Citation
- Transactions of the Korean Society of Mechanical Engineers, A, pp.1 - 4
- Indexed
- SCOPUS
KCI
- Journal Title
- Transactions of the Korean Society of Mechanical Engineers, A
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/13146
- ISSN
- 12264873
- Abstract
- Many people are seriously injured each year in automobile rollover accidents. Although the occurrence rate
of the automobile rollover accident is low, the injury is fatal. When a car rolls over, the roof structure has to
maintain occupant survival space. The National Highway Traffic Safety Administration (NHTSA) proposes
a regulation of strength requirements of the roof structure, FMVSS 216. Recently, the Insurance Institute for
Highway Safety (IIHS) proposed the reinforced strength requirements of the roof structure. Structural
optimization has been performed based on the regulations for roof crush. Most previous studies have been
using approximation methods such as the response surface method (RSM). However, the approximation
method can give inaccurate solutions in highly nonlinear problems, and it has a limitation on the number of
design variables. Therefore, the equivalent static loads method (ESLM) has been proposed to solve highly
nonlinear problems. Nonlinear quasi-static response optimization using ESLM has been performed by
considering the automobile rollover accident, however, the ideal force-displacement curve needs to be
defined. In this research, a new nonlinear quasi-static response optimization method is proposed using the
enforced displacement method. The proposed method consists of the analysis and design domains. The
displacements from nonlinear quasi-static analysis are used as the enforced displacements in linear static
response optimization as a loading condition. The roof strength requirement is considered as reaction force
constraints by following the reinforced regulations of IIHS. An example of nonlinear quasi-static response
optimization is solved by using the proposed method.
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