Geometrical compatibility in structural shape optimisation for crashworthiness

Abstract

This paper presents a parametric shape optimisation approach using special parameterisation techniques for shape optimisation of structures with respect to crashworthiness. It is based on SFE CONCEPT which has the ability to modify shape using implicit parameterisation technique and adapt mesh to the new geometry through re-meshing. The success of shape optimisation depends on the type of parameterisation used. It is, therefore, important to choose a set of shape parameters which allow for larger range of shape configurations. However, the difficulty to deal with shape modifications grows with the increasing number of shape variables due to the arising geometrical conflicts. Hence, most shape optimisation studies use limited number of shape variables and also reduced parameter bounds which restrict large shape configurations. Here a new offset mapping technique is used to facilitate the definition of shape parameter conflicts without compromising the design space. To demonstrate this technique, a bumper beam shape optimisation is presented.

Multidisciplinary design optimization of a generic b-pillar under package and design constraints

“…Only shape optimization is applied in this example is a general procedure for shape and size optimization in SFE CONCEPT. Such approaches have already been implemented for multiple applications, (Duddeck 2008;Hampl and Nammalwar 2011;Rayamajhi, Hunkeler, and Duddeck 2014). Mostly, these implementations use optimization platforms like Heeds (SIEMENS 2020) or ISight (Dassault Systèmes 2020b).…”

“…With its parametrization and meshing ability, SFE CONCEPT shortens the conceptual product development process for structural parts and assemblies. Exemplarily, Rayamajhi, Hunkeler, and Duddeck (2014) give a detailed introduction into the implicit parametrization technique used in SFE CONCEPT. For a better understanding of geometric parametrizations, Figure 1 shows a generic b-pillar with implicit parametrization for two possible designs.…”

Classification and mitigation of uncertainty as per the product design stages: framework and case study

“…Moullec et al [44] presented Bayesian network model for architecture design where uncertainties related to characteristics and compatibility of components is minimized. Rayamajhi et al [45] had proposed parametric shape optimization approach using special techniques for shape optimization of structures. Physical property uncertainty occurs due to limited knowledge or understanding of a physical process or interactions of processes in a system.…”

Concurrent editing of automotive styling and structure with wireframe-pair

“…Meanwhile, the concept of our study is slightly different from CAD/CAE integration. 12 SFE CONCEPT 13 is one of the well-developed software packages for integrating CAD and CAE models in automotive design. Similar to other works dedicated to CAD/CAE integration, it focuses on the problem of how to adapt the mesh model, for example a beam, according to the change of the CAD model of this beam.…”