Hybrid laminated composite E-springs are a new trend in automotive suspension systems. They can be featured of high structural strength and toughness to weight ratios and save almost 75 percent of the rattle-space required by the conventional multi-leaf springs while providing superior deflection capabilities. In this research work, the external configuration and the internal structure of the composite E-spring are optimized. A hybridization of both local search methods and random search methods is adopted along with a developed NURBS-based scheme, which stands for Non-Uniform Rational B-Splines. A mathematical-modeling-based mid-ware technology is introduced in order to fully automate the optimization process through linking the run engines of mathematical modeling and finite element analysis from within the mathematical modeling engine. A hybrid approach of the inter-laminar shear stress and Tsai-Wu criteria is first implemented in order to identify failure indices of the resulting optimum shape and laminate structure. A hybrid search optimization using genetic algorithm global optimizer, and hill-climbing random-walk local optimizer, arrived efficiently at the global optimum. A new composite structure design ratio called 'directional load ratio' was first introduced and implemented in order to facilitate and enhance arriving at the optimum set of fiber orientation angle values. Moreover, a first-introduced comprehensive composite failure analysis was implemented. It comprised the Tsai-Wu failure theory along with the interlaminar shear stress criterion, and buckling instability scheme.
Hybrid shape optimization and failure analysis of laminated fibrous composite E-springs for vehicle suspension
2006
11 Seiten, 13 Bilder, 2 Tabellen, 13 Quellen
Aufsatz (Konferenz)
Englisch
SAE Technical Papers | 2006
|British Library Conference Proceedings | 2006
|SAE Technical Papers | 2005
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