BIW material and thickness optimization for weight reduction of a vehicle

Design Requirements
  • Minimize weight
  • Satisfy static stiffness condition under bending force
  • Satisfy static stiffness condition under torsional force
Design Problem Formulation
  • Design variables  (119)
    Thickness variables (111)
    Material variables (8)
  • Objective (1)
    Minimize weight
  • Constraints (2)
    Static stiffness condition under bending load
    Static stiffness condition under torsional load
Simulation and Design Software
  • Simulation : Abaqus, Hypermesh
  • Design : PIAnO
Design Optimization Process
  1. Establish automation and perform DOE
  2. Generate metamodel using DOE samples
  3. Perform approximate optimization
Optimization Result
  • Weight reduction of 31% while satisfying all constraints