Modeling the varying dynamics of thin-walled aerospace structures for fixture design using genetic algorithms

Download
  1. Get@NRC: Modeling the varying dynamics of thin-walled aerospace structures for fixture design using genetic algorithms (Opens in a new window)
DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/AMR.223.652
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Proceedings titleAdvanced Materials Research
Conference17th CIRP Conference on Modelling of Machining Operations, 12 May 2011 through 13 May 2011, Sintra
ISSN1022-6680
ISBN9783037850954
Volume223
Pages652661; # of pages: 10
SubjectAnalytical modeling; Change of thickness; Fixture design; Milling; Thin-walled aerospace structures; Computational efficiency; Dynamic response; Dynamics; Engineering research; Fixtures (tooling); Machining centers; Milling (machining); Thin walled structures; Structural design
AbstractFixture design for milling of aerospace thin-walled structures is a challenging process due to the high flexibility of the structure and the nonlinear interaction between the forces and the system dynamics. At the same time, the industry is aiming at achieving tight tolerances while maintaining a high level of productivity. Numerical models based on FEM have been developed to simulate the dynamics of thin-walled structures and the effect of the fixture layout. These models require an extensive computational effort, which makes their use for optimization very unpractical. In this research work, a new concept is introduced by using a multi-span plate with torsional and translational springs to simulate the varying dynamics of thin-walled structure during machining. A formulation, based on holonomic constraints, was developed and implemented to take into account the effect of rigid fixture supports. The developed model, which reduces the computational time by one to two orders of magnitude as compared to FE models, is used to predict the dynamic response of complex aerospace structural elements including pockets and ribs while taking into account different fixture layouts. The model predictions are validated numerically. The developed model meets the conflicting requirements of prediction accuracy and computational efficiency. © (2011) Trans Tech Publication.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271443
Export citationExport as RIS
Report a correctionReport a correction
Record identifier94b82e72-7444-4ce0-85de-0bb1155be251
Record created2014-03-24
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)